pax_global_header00006660000000000000000000000064150323056250014513gustar00rootroot0000000000000052 comment=586ab3b12ca846942a7cfaedeae26dc40ec34740 MCP79412RTC-3.1.1/000077500000000000000000000000001503230562500131145ustar00rootroot00000000000000MCP79412RTC-3.1.1/.gitignore000066400000000000000000000000141503230562500150770ustar00rootroot00000000000000ReadMe.txt MCP79412RTC-3.1.1/CONTRIBUTING.md000066400000000000000000000051451503230562500153520ustar00rootroot00000000000000# A GitHub Manifesto ### Notes on contributing to my repositories Jack Christensen Jan 2018 Surely Git and GitHub are wonderful tools. They make coding and collaboration so much easier. I'm equally impressed with the open source movement, and with the Arduino ecosystem in particular. I'm just one guy, mostly a hobbyist. Posting my projects to GitHub is my way of giving back a little to the community. It's very gratifying that some of my code has received a modicum of popularity. Like many things, this has been somewhat of a double-edged sword. Especially since I tend to be a pretty busy guy with many varied interests. First, I am always interested in bug reports. Please raise an issue in the appropriate repository and please please please include a good, concise description of the issue and a Short, Self Contained, Correct (Compilable), Example (see [sscce.org](http://www.sscce.org/)). I will need to be able to reproduce the issue, with minimal hardware, and without installing a dozen other libraries. I work exclusively with the AVR architecture so most times I will not be able to reproduce issues on other platforms. (There have been one or two occasions where relatively simple changes have been made to accommodate another platform; I am not necessarily averse to these.) Second, bug reports should always be for problems with *my* code. I will not use GitHub to help you with *your* code, even if you happen to be using one of my libraries. Please use the [Arduino forum](https://forum.arduino.cc/) or other such venue instead. Finally, pull requests can be problematic, especially if they represent enhancements rather than fixes. I seldom intend my code to be all things to all people. This is mostly a hobby activity and I have very limited bandwidth. Reviewing and managing PRs requires time that I do not often have. Sometimes a PR will take a library in a direction that I'm not interested in. Sometimes a PR will be counter to my original design intent. No doubt the author of a PR thinks that their new feature is the best thing since canned beer, but if I don't happen to share that opinion, then I'll decline it. OTOH, I am certainly capable of making stupid mistakes and missing absolutely fundamental things, and I do appreciate it when these are pointed out. All this to say, that if I do decline a request, please do not take it personally. Feel free to consider it my problem, not yours. At the end of the day, it's my code, and I reserve the right to decline issues or PRs for any reason, or for no reason at all. But here is the beauty of open source. You can always fork the repository and have your way with it. MCP79412RTC-3.1.1/LICENSE.md000066400000000000000000001041441503230562500145240ustar00rootroot00000000000000### GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. ### Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. 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The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such. #### 14. Revised Versions of this License. The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License "or any later version" applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU General Public License, you may choose any version ever published by the Free Software Foundation. If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program. Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version. #### 15. Disclaimer of Warranty. THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. #### 16. Limitation of Liability. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. #### 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS ### How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: Copyright (C) This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands \`show w' and \`show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . MCP79412RTC-3.1.1/README.md000066400000000000000000000546421503230562500144060ustar00rootroot00000000000000# Arduino MCP79412 RTC Library https://github.com/JChristensen/MCP79412RTC README file Jack Christensen May 2025 ## License Arduino MCP79412 RTC Library Copyright (C) 2012-2025 byJack Christensen GNU GPL v3.0 This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License v3.0 as published by the Free Software Foundation. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see ## Version 3.0.0 notes Version 3.0.0 adds the ability to address different I2C peripherals for microcontrollers that have more than one (e.g. `Wire`, `Wire1`, etc.) There is one situation that is not backwards compatible with earlier versions of the library. Code that calls `setSyncProvider()` in the [Time library](https://github.com/PaulStoffregen/Time), e.g.: ```c++ setSyncProvider(myRTC.get); ``` Needs to change as follows: ```c++ setSyncProvider([](){return myRTC.get();}); ``` This uses a lambda to provide the Time library with a static function, which it requires. The `MCP79412::get()` function was static in previous versions of the library, but no longer is in v3.0.0. This allows the flexibility to operate with different I2C peripherals. ## Version 2.0.0 notes The 2.0.0 version of the library has some significant changes and is not completely backwards compatible with earlier versions. These changes provide a more consistent API and reduce the possibility of name collisions. While sketches using this library will likely require changes as a result, these should be mostly straightforward. - The library no longer defines an `MCP79412RTC` object, therefore each sketch needs to define one. (Previous versions of the library defined an `MCP79412RTC` object named `RTC`, although only for AVR architecture. Consider using a name other than `RTC` as this can cause a name collision on some architectures.) - The constructor no longer has the capability to initialize the I2C bus and no longer accepts an optional parameter. Therefore, the sketch needs to call `MCP79412RTC::begin()` in the `setup()` function or elsewhere as appropriate. - To reduce the possibility of name collisions, the enumerations as well as register addresses, etc. are now defined in the header file within the `MCP79412RTC` class. Therefore, when using any of these names, it will be necessary to include the `MCP79412RTC` scope, e.g. `myRTC.alarm(MCP79412RTC::ALARM_1);` - The example sketches and documentation have been updated to reflect these changes. ## Introduction **MCP79412RTC** is an Arduino library that supports the Microchip MCP7941x Real-Time Clock/Calendar chips. This library is intended to be used with [PJRC's Arduino Time library](https://github.com/PaulStoffregen/Time). **For more information on the MCP79412, see:** The [Microchip MCP79412 Product Page](https://www.microchip.com/en-us/product/MCP79412) for specs, datasheet, etc. [My Blog Post](http://goo.gl/MkBnjR), summarizing the features and advantages of the MCP79412 [My Power Outage Logger Project](http://goo.gl/RfM5os), an Arduino-based project featuring the MCP79412 ## Examples The following example sketches are included with the **MCP79412RTC** library: - **rtcSet1:** Set the RTC date and time using a hard-coded value in the sketch. - **rtcSet2:** Similar to **rtcSet1**, a different way to hard-code the date and time. - **rtcSet3:** Set the RTC to the sketch compile date and time. - **rtc_wire1:** Raspberry Pi Pico example using `Wire1`. - **SetSerial:** Set the RTC's date, time, and calibration register from the Arduino serial monitor. - **TimeRTC:** Similar to the example of the same name provided with the **Time** library. - **rtc_interrupt:** Uses a 1Hz interrupt from the RTC to keep time. - **PowerOutageLogger:** A comprehensive example that implements a power failure logger using the MCP79412's ability to capture power down and power up times. Power failure events are logged to the MCP79412's SRAM. Output is to the Arduino serial monitor. - **tiny79412_KnockBang:** Demonstrates interfacing an ATtiny45/85 to the MCP79412. ## Enumerations ### ALARM_TYPES_t ##### Description Symbolic names used with the `enableAlarm()` function described below. ##### Values - ALM_MATCH_SECONDS -- Triggers alarm when the seconds in the RTC time keeping register match the seconds in the alarm register. - ALM_MATCH_MINUTES -- Triggers when RTC time minutes match alarm minutes. - ALM_MATCH_HOURS -- Triggers when RTC time hours match alarm hours. - ALM_MATCH_DAY -- Triggers when day of the week matches. (Triggers at midnight.) - ALM_MATCH_DATE -- Triggers when date matches. (Triggers at midnight.) - ALM_MATCH_DATETIME -- Triggers when seconds, minutes, hours, day of week, date and month all match. - ALM_DISABLE -- Disables the alarm. ### ALARM_NBR_t ##### Description Symbolic names used with alarm functions. ##### Values - ALARM_0 - ALARM_1 ### SQWAVE_FREQS_t ##### Description Symbolic names used with the squareWave() function (described below). ##### Values - SQWAVE_1_HZ, - SQWAVE_4096_HZ, - SQWAVE_8192_HZ, - SQWAVE_32768_HZ, - SQWAVE_NONE ## Constructor ### MCP79412RTC(TwoWire& wire) ##### Description Instantiates an `MCP79412RTC` object. ##### Syntax `MCP79412RTC myRTC(wire);` ##### Parameters **wire:** An optional parameter to specify which I2C bus to use. If omitted, defaults to `Wire`. *(TwoWire&)* ##### Returns None. ##### Example ```c++ MCP79412RTC myRTC; // to use Wire // or MCP79412RTC myRTC(Wire1); // to use Wire1 ``` ## Initialization function ### begin() ##### Description Initializes the I2C bus. Calls `Wire.begin()`. ##### Syntax `begin();` ##### Parameters None. ##### Returns None. ##### Example ```c++ MCP79412RTC myRTC; void setup() { myRTC.begin(); } ``` ## Functions for setting and reading the time ### get() ##### Description Reads the current date and time from the RTC and returns it as a *time_t* value. Returns zero if an I2C error occurs (RTC not present, etc.). ##### Syntax `RTC.get();` ##### Parameters None. ##### Returns Current date and time *(time_t)* ##### Example ```c++ time_t myTime; myTime = RTC.get(); ``` ### set(time_t t) ##### Description Sets the RTC date and time to the given *time_t* value. ##### Syntax `RTC.set(t);` ##### Parameters **t:** The date and time to set the RTC to *(time_t)* ##### Returns None. ##### Example ```c++ //this example first sets the system time (maintained by the Time library) to //a hard-coded date and time, and then sets the RTC from the system time. //the setTime() function is part of the Time library. setTime(23, 31, 30, 13, 2, 2009); //set the system time to 23h31m30s on 13Feb2009 RTC.set(now()); //set the RTC from the system time ``` ### read(tmElements_t &tm) ##### Description Reads the current date and time from the RTC and returns it as a *tmElements_t* structure. Returns *false* if an I2C error occurs (RTC not present, etc.). See the [Arduino Time library](https://www.arduino.cc/playground/Code/Time) for details on the *tmElements_t* structure. ##### Syntax `RTC.read(tm);` ##### Parameters **tm:** Address of a *tmElements_t* structure to which the date and time are returned. ##### Returns False if an I2C error occurred, else true. The date and time read from the RTC are returned to the **tm** parameter. ##### Example ```c++ tmElements_t tm; RTC.read(tm); Serial.print(tm.Hour, DEC); Serial.print(':'); Serial.print(tm.Minute,DEC); Serial.print(':'); Serial.println(tm.Second,DEC); ``` ### write(tmElements_t &tm) ##### Description Sets the RTC to the date and time given by a *tmElements_t* structure. ##### Syntax `RTC.write(tm);` ##### Parameters **tm:** Address of a *tmElements_t* structure used to set the date and time. ##### Returns None. ##### Example ```c++ tmElements_t tm; tm.Hour = 23; //set the tm structure to 23h31m30s on 13Feb2009 tm.Minute = 31; tm.Minute = 30; tm.Day = 13; tm.Month = 2; tm.Year = 2009 - 1970; //tmElements_t.Year is the offset from 1970 RTC.write(tm); //set the RTC from the tm structure ``` ### isRunning() ##### Description Returns a boolean value indicating whether the RTC's oscillator is running. When there is no backup battery present, the RTC will reset when it is next powered up, and the oscillator will not be running. Setting the time with `RTC.set()` or `RTC.write()` starts the oscillator. ##### Syntax `RTC.isRunning();` ##### Parameters None. ##### Returns True if the RTC's oscillator is running, else false *(boolean)* ##### Example ```c++ if ( RTC.isRunning() ) //do something else //do something else ``` ## Alarm functions The MCP79412 RTC has two alarms (Alarm-0 and Alarm-1) that can be used separately or simultaneously. When an alarm is triggered, a flag is set in the RTC that can be detected with the `alarm()` function below. Optionally, the RTC's Multi-Function Pin (MFP) can be driven to either a low or high logic level when an alarm is triggered. When using the MFP with both alarms, be sure to read the comments on the `alarmPolarity()` function below. ### setAlarm(byte alarmNumber, time_t alarmTime) ##### Description Sets an alarm date and time. This *sets* the alarm registers only, it does not *enable* the alarm, this is done using the `enableAlarm()` function. *alarmNumber* is 0 or 1, but is ruthlessly masked to ensure a valid value. Note that depending on the alarm type chosen (see `enableAlarm()` below), only selected date or time parts may act as alarm critera. Nevertheless, valid values should be specified in the *alarmTime* parameter. ##### Syntax `RTC.setAlarm(alarmNumber, alarmTime);` ##### Parameters **alarmNumber:** ALARM_0 or ALARM_1 *(byte)* **alarmTime:** Date and time to set the alarm to *(time_t)* ##### Returns None. ##### Example ```c++ //set alarm-1 for 30 seconds after midnight on 21Dec2012 tmElements_t tm; tm.Hour = 0; tm.Minute = 0; tm.Second = 30; tm.Year = CalendarYrToTm(2012); tm.Month = 12; tm.Day = 21; RTC.setAlarm(ALARM_1, makeTime(tm)); ``` ### enableAlarm(byte alarmNumber, byte alarmType) ##### Description Enable or disable the given alarm. ##### Syntax `RTC.enableAlarm(alarmNumber, alarmType);` ##### Parameters **alarmNumber:** ALARM_0 or ALARM_1 *(byte)* **alarmType:** One of the following: ALM_MATCH_SECONDS, ALM_MATCH_MINUTES, ALM_MATCH_HOURS, ALM_MATCH_DAY, ALM_MATCH_DATE, ALM_MATCH_DATETIME, ALM_DISABLE. (ALM_MATCH_DATETIME triggers the alarm when seconds, minutes, hours, day, date and month *all* match.) ##### Returns None. ##### Example ```c++ //disable alarm-0 RTC.enableAlarm(ALARM_0, ALM_DISABLE); //enable alarm-1 to trigger when the minutes match. //assuming alarm-1 is set as in the example above, this will trigger the //alarm every hour, on the hour (minutes=0). RTC.enableAlarm(ALARM_1, ALM_MATCH_MINUTES); //enable alarm-1 to trigger when the seconds match. //assuming alarm-1 is set as in the example above, this will trigger the //alarm once a minute, at 30 seconds past the minute. RTC.enableAlarm(ALARM_1, ALM_MATCH_SECONDS); ``` ### alarm(byte alarmNumber) ##### Description Tests whether the given alarm has been triggered, and returns a corresponding boolean value. Clears the alarm flag to ensure that the next trigger event can be trapped. ##### Syntax `RTC.alarm(byte alarmNumber);` ##### Parameters **alarmNumber:** ALARM_0 or ALARM_1 *(byte)* ##### Returns True if the alarm was triggered, else false *(boolean)* ##### Example ```c++ if ( RTC.alarm(ALARM_0) ) //alarm-0 has triggered else //alarm-0 has not triggered ``` ### alarmPolarity(boolean polarity) ##### Description Specifies the logic level on the Multi-Function Pin (MFP) when an alarm is triggered. The default is LOW. When both alarms are active, the two are ORed together to determine the level of the MFP. With alarm polarity set to LOW (the default), this causes the MFP to go low only when BOTH alarms are triggered. With alarm polarity set to HIGH, the MFP will go high when EITHER alarm is triggered. Note that the state of the MFP is independent of the RTC's (so-called) alarm "interrupt" flags, and that the `alarm()` function will indicate when an alarm is triggered regardless of the polarity. ##### Syntax `RTC.alarmPolarity(boolean polarity);` ##### Parameters **polarity:** HIGH or LOW *(boolean)* ##### Returns None. ##### Example ```c++ RTC.alarmPolarity(HIGH); //drives MFP high when an alarm is triggered ``` ## Functions for reading and writing static RAM (SRAM) The MCP79412 RTC has 64 bytes of battery-backed SRAM that can be read and written with the following functions using addresses between 0 and 63. Addresses passed to these functions are constrained to the valid range by an AND function. ### sramWrite(byte addr, byte value) ##### Description Writes a single byte to the SRAM. ##### Syntax `RTC.sramWrite(addr, value);` ##### Parameters **addr:** SRAM address to write *(byte)* **value:** Value to write *(byte)* ##### Returns None. ##### Example ```c++ RTC.sramWrite(3, 14); //write the value 14 to SRAM address 3 ``` ### sramWrite(byte addr, byte *values, byte nBytes) ##### Description Writes multiple bytes to consecutive SRAM locations. *nBytes* must be between 1 and 31. Invalid values of *nBytes*, or combinations of *addr* and *nBytes* that would result in addressing past the last byte of SRAM will result in no action. ##### Syntax `RTC.sramWrite(addr, values, nBytes);` ##### Parameters **addr:** First SRAM address to write *(byte)* **value:** An array of values to write _(*byte)_ **nBytes:** Number of bytes to write *(byte)* ##### Returns None. ##### Example ```c++ //write 1, 2, ..., 8 to the first eight SRAM locations byte buf[8] = {1, 2, 3, 4, 5, 6, 7, 8}; RTC.sramWrite(0, buf, 8); ``` ### sramRead(byte addr) ##### Description Reads a single byte from SRAM. ##### Syntax `RTC.sramRead(addr);` ##### Parameters **addr:** SRAM address to read *(byte)* ##### Returns The value read *(byte)* ##### Example ```c++ byte val; val = RTC.sramRead(3); //read the value from SRAM location 3 ``` ### sramRead(byte addr, byte *values, byte nBytes) ##### Description Reads multiple bytes from consecutive SRAM locations. nBytes must be between 1 and 32. Invalid values of *nBytes*, or combinations of *addr* and *nBytes* that would result in addressing past the last byte of SRAM will result in no action. ##### Syntax `RTC.sramRead(addr, values, nBytes);` ##### Parameters **addr:** First SRAM address to read *(byte)* **values:** An array to receive the read values _(*byte)_ **nBytes:** Number of bytes to read *(byte)* ##### Returns No function value returned. Bytes read from SRAM are returned to the **values** array. ##### Example ```c++ //read the last eight locations of SRAM into buf byte buf[8]; RTC.sramRead(56, buf, 8); ``` ## Functions for Reading and writing EEPROM The MCP79412 RTC has 128 bytes of non-volatile EEPROM that can be read and written with the following functions using addresses between 0 and 127. Addresses passed to these functions are constrained to the valid range by an AND function. EEPROM is paged memory with a page size of 8 bytes; when writing multiple bytes, this this limits the number of bytes that can be written at one time to 8. Page writes must start on a page boundary. ### eepromWrite(byte addr, byte value) ##### Description Writes a single byte to EEPROM. ##### Syntax `RTC.eepromWrite(addr, value);` ##### Parameters **addr:** EEPROM address to write *(byte)* **value:** Value to write *(byte)* ##### Returns None. ##### Example ```c++ RTC.eepromWrite(42, 55); //write the value 55 to EEPROM address 42 ``` ### eepromWrite(byte addr, byte *values, byte nBytes) ##### Description Writes a page (8 bytes) or less to EEPROM. *addr* should be a page start address (0, 8, ..., 120), but if not, is ruthlessly coerced into a valid value with an AND function. *nBytes* must be between 1 and 8, other values result in no action. ##### Syntax `RTC.eepromWrite(addr, values, nBytes);` ##### Parameters **addr:** First EEPROM address to write *(byte)* **value:** An array of values to write _(*byte)_ **nBytes:** Number of bytes to write *(byte)* ##### Returns None. ##### Example ```c++ //write 1, 2, ..., 8 to the first eight EEPROM locations byte buf[8] = {1, 2, 3, 4, 5, 6, 7, 8}; RTC.eepromWrite(0, buf, 8); ``` ### eepromRead(byte addr) ##### Description Reads a single byte from EEPROM and returns the value. ##### Syntax `RTC.eepromRead(byte addr);` ##### Parameters **addr:** EEPROM address to read *(byte)* ##### Returns The value read *(byte)* ##### Example ```c++ byte val; val = RTC.eepromRead(42); //read the value from EEPROM location 42 ``` ### eepromRead(byte addr, byte *values, byte nBytes) ##### Description Reads multiple bytes from consecutive EEPROM locations. *nBytes* must be between 1 and 32. Invalid values of *nBytes*, or combinations of *addr* and *nBytes* that would result in addressing past the last byte of EEPROM will result in no action. ##### Syntax `RTC.eepromRead(addr, values, nBytes);` ##### Parameters **addr:** First EEPROM address to read *(byte)* **values:** An array to receive the read values _(*byte)_ **nBytes:** Number of bytes to read *(byte)* ##### Returns No function value returned. The bytes read from EEPROM are returned to the **values** array. ##### Example ```c++ //read the last eight locations of EEPROM into buf byte buf[8]; RTC.eepromRead(120, buf, 8); ``` ## Calibration, power failure, and other functions ### calibWrite(int value) ##### Description Writes the given value to the RTC calibration register. This is an adjustment factor in PPM (approximately), and must be between -127 and 127. Negative numbers cause the RTC to run faster, positive numbers cause it to run slower. ##### Syntax `RTC.calibWrite(int value);` ##### Parameters **value:** The calibration value to set, between -127 and 127 *(int)* ##### Returns None. ##### Example ```c++ RTC.calibWrite(13); //makes the RTC run slower by 13 parts per million. RTC.calibWrite(-42); //makes the RTC run faster by 42 parts per million. ``` ### calibRead() ##### Description Reads the RTC calibration register. ##### Syntax `RTC.calibRead();` ##### Parameters None. ##### Returns RTC calibration register value *(int)* ##### Example ```c++ int value; value = RTC.calibRead(); ``` ### powerFail(time_t *powerDown, time_t *powerUp) ##### Description Returns a boolean value (true or false) to indicate whether a power failure has occurred. If a power failure occurred, the power down and power up timestamps are returned in the variables given by the caller, the RTC's power fail flag is reset and the power up/down timestamps are cleared. Note that the power down and power up timestamp registers do not contain values for seconds or for the year. The returned time stamps will therefore contain the current year from the RTC. However, there is the possibility that a power outage spans from one year to the next. If this occurs, the power down timestamp would appear to be at a later time than the power up timestamp; if this is encountered, `powerFail()` will subtract one year from the power down timestamp before returning it. Still, there is an assumption that the timestamps are being read in the same year as that when the power up occurred. If this is not the case the year in the returned timestamp will be invalid. Finally, note that once the RTC records a power outage, it must be cleared before another can be recorded. If two power outages occur before `powerFail()` is called again, the time stamps for the earlier outage will be returned and the timestamps for the second outage will be lost. ##### Syntax `RTC.powerFail(powerDown, powerUp);` ##### Parameters **powerDown:** Pointer to a *time_t* variable to hold the returned power down timestamp. **powerUp:** Pointer to a *time_t* variable to hold the returned power up timestamp. ##### Returns True if a power failure occurred, else false *(boolean)* ##### Example ```c++ time_t powerDown, powerUp; //power outage timestamps if ( RTC.powerFail(&powerDown, &powerUp) ) { //do something else //do something else ``` ### squareWave(byte freq) ##### Description Enables or disables the square wave output on the multi-function pin (MFP). ##### Syntax `RTC.squareWave(byte freq);` ##### Parameters **freq:** One of the following: SQWAVE_1_HZ, SQWAVE_4096_HZ, SQWAVE_8192_HZ, SQWAVE_32768_HZ, SQWAVE_NONE *(byte)* ##### Returns None. ##### Example ```c++ RTC.squareWave(SQWAVE_1_HZ); //output a 1Hz square wave on the MFP ``` -------------------------------------------------------------------------------- ### out(boolean level) ##### Description Sets the logic level on the MFP when it's not being used as a square wave or alarm output. The default value after the RTC chip is reset is HIGH. ##### Syntax `RTC.out(boolean level);` ##### Parameters **level**: HIGH or LOW *(boolean)* ##### Returns None. ##### Example ```c++ RTC.out(LOW); //set the MFP to a low logic level ``` -------------------------------------------------------------------------------- ### idRead(byte *uniqueID) ##### Description Reads the 64-bit unique ID from the RTC. ##### Syntax `RTC.idRead(byte *uniqueID);` ##### Parameters **uniqueID:** An 8-byte array to receive the unique ID _(*byte)_ ##### Returns No function value returned. The RTC's ID is returned to the **uniqueID** array. ##### Example ```c++ byte buf[8]; RTC.idRead(buf); ``` -------------------------------------------------------------------------------- ### vbaten(boolean enable) ##### Description Set or clear the VBATEN bit. Setting the bit powers the clock and SRAM from the backup battery when Vcc falls. Note that setting the time via set() or write() sets the VBATEN bit. ##### Syntax `RTC.vbaten(boolean enable);` ##### Parameters **enable:** true or false *(boolean)* ##### Returns None. ##### Example ```c++ RTC.vbaten(false); ``` -------------------------------------------------------------------------------- ### getEUI64(byte *uniqueID) ##### Description Returns an EUI-64 ID. For an MCP79412, calling this function is equivalent to calling `idRead()`. For an MCP79411, the EUI-48 ID is converted to EUI-64. Caller must provide an 8-byte array to contain the results. ##### Syntax `RTC.getEUI64(byte *uniqueID);` ##### Parameters **uniqueID:** An 8-byte array to receive the EUI-64 unique ID _(*byte)_ ##### Returns No function value returned. The EUI-64 ID is returned to the **uniqueID** array. ##### Example ```c++ byte buf[8]; RTC.getEUI64(buf); ``` MCP79412RTC-3.1.1/examples/000077500000000000000000000000001503230562500147325ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/PowerOutageLogger/000077500000000000000000000000001503230562500203335ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/PowerOutageLogger/PowerOutageLogger.ino000066400000000000000000000164241503230562500244520ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Example sketch: Power Outage Logger using Microchip MCP79412 RTC. // Assumes the RTC is running and set to UTC. // A maximum of 7 outages (power down/up times) can be logged in the // RTC's SRAM. // The logging data structure is automatically initialized if not // present. An initialization can be forced with a button switch // connected from pin 9 to ground. Hold the button down // while resetting the MCU to initialize the logging data. // // Jack Christensen 23Aug2012 #include // https://github.com/JChristensen/MCP79412RTC #include // https://github.com/janelia-arduino/Streaming #include // https://github.com/JChristensen/Timezone MCP79412RTC myRTC; void setup() { constexpr uint8_t initButton {9}; pinMode(initButton, INPUT_PULLUP); myRTC.begin(); Serial.begin(115200); Serial << F( "\n" __FILE__ " " __DATE__ " " __TIME__ "\n" ); setSyncProvider([](){return myRTC.get();}); // the function to get the time from the RTC Serial << "RTC SYNC"; if (timeStatus()!= timeSet) Serial << " FAIL"; Serial << endl; if (!digitalRead(initButton)) logClear(); logOutage(); //myRTC.dumpSRAM(); } // US Eastern Time Zone (New York, Detroit) TimeChangeRule myDST = {"EDT", Second, Sun, Mar, 2, -240}; // Daylight time = UTC - 4 hours TimeChangeRule mySTD = {"EST", First, Sun, Nov, 2, -300}; // Standard time = UTC - 5 hours Timezone myTZ(myDST, mySTD); TimeChangeRule *tcr; // pointer to the time change rule, used to get TZ abbrev void loop() { // nothing here in loop() has anything to do with logging power outages, // we just print the time once a minute so that something is happening. static time_t lastUTC; time_t utc = now(); if (minute(utc) != minute(lastUTC)) { lastUTC = utc; time_t local = myTZ.toLocal(utc, &tcr); Serial << endl; printTime(utc, "UTC"); printTime(local, tcr -> abbrev); } } // constants for logging constexpr uint8_t firstOutageAddr {0x08}, // address of first outage timestamps in RTC SRAM outageLength {8}, // 8 data bytes for each outage (start and end timestamps, both are time_t values) maxOutages {7}, // maximum number of outage timestamp pairs that can be stored in SRAM lastOutageAddr {firstOutageAddr + outageLength * (maxOutages - 1)}, // last outage address appID {1}, // appID and 4 bytes of the RTC ID are stored in sram to provide // a way to recognize that the logging data structure has been initialized rtcID {0x00}, // lower 4 bytes of RTC unique ID are stored at sram addr 0x00 appAddr {0x04}, // address of appID in sram nbrOutagesAddr {0x05}, // address containing number of outages currently stored in SRAM nextOutageAddr {0x06}, // address containing pointer to next outage rfuAddr {0x07}; // reserved for future use // initialize the log data structure in the RTC SRAM if needed. // log a new outage if one occurred. // print out the outages logged. void logOutage() { union { uint8_t b[8]; struct { uint32_t hi; uint32_t lo; }; } uniqueID; // 8-byte RTC "unique ID" with access to upper and lower halves myRTC.idRead(uniqueID.b); // get the RTC's ID uint32_t loID = read32(rtcID); // if already initialized, the lower half of the ID is stored in SRAM, uint8_t app = myRTC.sramRead(appAddr); // and also the app ID Serial << "RTC ID"; for (uint8_t i=0; i<8; i++) { Serial << (uniqueID.b[i] < 16 ? " 0" : " ") << _HEX(uniqueID.b[i]); } Serial << endl; if ( loID != uniqueID.lo || app != appID ) { // logging initialized? write32(rtcID, uniqueID.lo); // least significant half of the RTC unique ID myRTC.sramWrite(appAddr, appID); // app ID myRTC.sramWrite(nbrOutagesAddr, 0); // number of outages myRTC.sramWrite(nextOutageAddr, firstOutageAddr); // next location for outage times myRTC.sramWrite(rfuAddr, 0); // reserved for future use Serial << "Logging initialized" << endl; // no, do it now } // if an outage has occurred, record it time_t powerDown, powerUp; // power outage timestamps uint8_t nOutage; // number of outages stored in sram uint8_t nextOutage; // address of next outage timestamps in sram if ( myRTC.powerFail(&powerDown, &powerUp) ) { nOutage = myRTC.sramRead(nbrOutagesAddr); nextOutage = myRTC.sramRead(nextOutageAddr); write32(nextOutage, powerDown); write32(nextOutage + 4, powerUp); nextOutage += outageLength; if (nextOutage > lastOutageAddr) nextOutage = firstOutageAddr; myRTC.sramWrite(nextOutageAddr, nextOutage); if (nOutage < maxOutages) myRTC.sramWrite(nbrOutagesAddr, ++nOutage); } // print out all the outages logged nOutage = myRTC.sramRead(nbrOutagesAddr); nextOutage = myRTC.sramRead(nextOutageAddr); uint8_t outageAddr = nextOutage - outageLength; if (outageAddr < firstOutageAddr) outageAddr = lastOutageAddr; Serial << endl << "Power outages logged: " << _DEC(nOutage) << endl; for (uint8_t i=nOutage; i>0; i--) { powerDown = read32(outageAddr); powerUp = read32(outageAddr + 4); Serial << endl << _DEC(i) << ": Power down "; printTime(myTZ.toLocal(powerDown, &tcr), tcr -> abbrev); Serial << _DEC(i) << ": Power up "; printTime(myTZ.toLocal(powerUp, &tcr), tcr -> abbrev); outageAddr -= outageLength; if (outageAddr < firstOutageAddr) outageAddr = lastOutageAddr; } } // initialize the logging data structure and log data void logClear() { for (uint8_t i=0; i // https://github.com/JChristensen/MCP79412RTC #include // http://arduiniana.org/libraries/streaming/ MCP79412RTC myRTC; void setup() { Serial.begin(115200); Serial << F( "\n" __FILE__ "\n" __DATE__ " " __TIME__ "\n" ); myRTC.begin(); // setSyncProvider() causes the Time library to synchronize with the // external RTC by calling myRTC.get() every five minutes by default. setSyncProvider([](){return myRTC.get();}); Serial << endl << F("RTC Sync"); if (timeStatus() != timeSet) Serial << F(" FAIL!"); Serial << endl; uint8_t rtcID[8]; myRTC.idRead(rtcID); Serial << F("RTC ID = "); for (int i=0; i<8; ++i) { if (rtcID[i] < 16) Serial << '0'; Serial << _HEX(rtcID[i]); } Serial << endl; myRTC.getEUI64(rtcID); Serial << F("EUI-64 = "); for (int i=0; i<8; ++i) { if (rtcID[i] < 16) Serial << '0'; Serial << _HEX(rtcID[i]); } Serial << endl; Serial << F("Calibration Register = ") << myRTC.calibRead() << endl; } void loop() { // check for input, to set rtc time or calibration if (Serial.available()) setRTC(); // print time and date every second static time_t tLast; time_t t { now() }; if (t != tLast) { tLast = t; printTime(t); } } void setRTC() { // first character is a command, "S" to set date/time, or "C" to set the calibration register int cmdChar = Serial.read(); switch (cmdChar) { case 'S': case 's': delay(25); // wait for all the input to arrive // check for input to set the RTC, minimum length is 13, i.e. yy,m,d,h,m,s if (Serial.available() < 13) { while (Serial.available()) Serial.read(); // dump extraneous input Serial << F("Input error or timeout, try again.\n"); } else { // note that the tmElements_t Year member is an offset from 1970, // but the RTC wants the last two digits of the calendar year. // use the convenience macros from TimeLib.h to do the conversions. int y = Serial.parseInt(); if (y >= 100 && y < 1000) Serial << F("Error: Year must be two digits or four digits!\n"); else { tmElements_t tm; if (y >= 1000) tm.Year = CalendarYrToTm(y); else //(y < 100) tm.Year = y2kYearToTm(y); tm.Month = Serial.parseInt(); tm.Day = Serial.parseInt(); tm.Hour = Serial.parseInt(); tm.Minute = Serial.parseInt(); tm.Second = Serial.parseInt(); if (tm.Month == 0 || tm.Day == 0) { while (Serial.available()) Serial.read(); // dump extraneous input Serial << F("Input error or timeout, try again.\n"); } else { time_t t = makeTime(tm); myRTC.set(t); // use the time_t value to ensure correct weekday is set setTime(t); Serial << F("RTC set to: "); printTime(t); } } } break; case 'C': case 'c': delay(25); // wait for all the input to arrive if (Serial.available() < 2) { // minimum valid input at this point is 2 chars while (Serial.available()) Serial.read(); // dump extraneous input Serial << F("Input error or timeout, try again.\n"); } else { int newCal = Serial.parseInt(); int oldCal = myRTC.calibRead(); myRTC.calibWrite(newCal); Serial << F("Calibration changed from ") << oldCal << F(" to ") << myRTC.calibRead() << endl; } break; default: Serial << endl << F("Unrecognized command: ") << (char)cmdChar << endl; break; } // dump any extraneous input while (Serial.available()) Serial.read(); } // format and print a time_t value void printTime(const time_t t) { char buf[25]; char m[4]; // temporary storage for month string (DateStrings.cpp uses shared buffer) strcpy(m, monthShortStr(month(t))); sprintf(buf, "%.2d:%.2d:%.2d %s %.2d %s %d", hour(t), minute(t), second(t), dayShortStr(weekday(t)), day(t), m, year(t)); Serial.println(buf); } MCP79412RTC-3.1.1/examples/TimeRTC/000077500000000000000000000000001503230562500162015ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/TimeRTC/TimeRTC.ino000066400000000000000000000021511503230562500201560ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // TimeRTC.ino // Example sketch showing basic usage. #include // http://github.com/JChristensen/MCP79412RTC MCP79412RTC myRTC; void setup() { myRTC.begin(); Serial.begin(115200); setSyncProvider([](){return myRTC.get();}); // the function to get the time from the RTC if (timeStatus() != timeSet) Serial.println("Unable to sync with the RTC"); else Serial.println("RTC has set the system time"); } void loop() { digitalClockDisplay(); delay(1000); } // digital clock display of the time void digitalClockDisplay() { Serial.print(hour()); printDigits(minute()); printDigits(second()); Serial.print(" "); Serial.print(day()); Serial.print(" "); Serial.print(month()); Serial.print(" "); Serial.print(year()); Serial.println(); } // utility function for digital clock display: prints preceding colon and leading 0 void printDigits(int digits) { Serial.print(":"); if (digits < 10) Serial.print('0'); Serial.print(digits); } MCP79412RTC-3.1.1/examples/alarm_ex1/000077500000000000000000000000001503230562500166035ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/alarm_ex1/alarm_ex1.ino000066400000000000000000000050111503230562500211600ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // MCP79412RTC Alarm Example Sketch #1 // // Set Alarm 0 to occur once a minute at 5 seconds after the minute. // Detect the alarm by polling the MFP output as well as the RTC alarm flag. // // Hardware: // Arduino Uno, MCP79410/11/12 RTC. // Connect RTC SDA to Arduino pin A4. // Connect RTC SCL to Arduino pin A5. // // Jack Christensen 27Apr2022 #include // https://github.com/JChristensen/MCP79412RTC #include // https://github.com/janelia-arduino/Streaming MCP79412RTC myRTC; constexpr uint8_t mfp {3}; // connect to RTC multi-function pin. void setup() { Serial.begin(115200); Serial << F( "\n" __FILE__ "\nCompiled " __DATE__ " " __TIME__ "\n" ); pinMode(mfp, INPUT_PULLUP); // initialize the alarms to known values, clear the alarm flags, clear the alarm interrupt flags myRTC.begin(); myRTC.enableAlarm(MCP79412RTC::ALARM_0, MCP79412RTC::ALM_DISABLE); myRTC.enableAlarm(MCP79412RTC::ALARM_1, MCP79412RTC::ALM_DISABLE); myRTC.alarm(MCP79412RTC::ALARM_0); myRTC.alarm(MCP79412RTC::ALARM_1); myRTC.squareWave(MCP79412RTC::SQWAVE_NONE); // set Alarm 0 to occur at 5 seconds after every minute myRTC.setAlarm(MCP79412RTC::ALARM_0, 2022, 1, 1, 0, 0, 5); myRTC.enableAlarm(MCP79412RTC::ALARM_0, MCP79412RTC::ALM_MATCH_SECONDS); Serial << endl << millis() << " Start "; printTime(myRTC.get()); myRTC.dumpRegs(); } void loop() { if (!digitalRead(mfp)) { // is the mfp pulled low Serial << millis() << " MFP LOW "; printTime(myRTC.get()); } if ( myRTC.alarm(MCP79412RTC::ALARM_0) ) { // check alarm flag, clear it if set Serial << millis() << " ALARM_0 "; printTime(myRTC.get()); } if ( myRTC.alarm(MCP79412RTC::ALARM_1) ) { // check alarm flag, clear it if set Serial << millis() << " ALARM_1 "; printTime(myRTC.get()); } delay(100); // no need to bombard the RTC continuously } // format and print a time_t value void printTime(const time_t t) { char buf[25]; char m[4]; // temporary storage for month string (DateStrings.cpp uses shared buffer) strcpy(m, monthShortStr(month(t))); sprintf(buf, "%.2d:%.2d:%.2d %s %.2d %s %d", hour(t), minute(t), second(t), dayShortStr(weekday(t)), day(t), m, year(t)); Serial.println(buf); } MCP79412RTC-3.1.1/examples/rtcSet1/000077500000000000000000000000001503230562500162575ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/rtcSet1/rtcSet1.ino000066400000000000000000000037261503230562500203230ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Example sketch to set the RTC date and time to a hard-coded value. // This is just a simple demonstration of setting the RTC time. // Note that each time the sketch is run (or the microcontroller is // reset), the RTC will be set to the same hard-coded time, so this // example may be of limited usefulness as an actual clock. #include // https://github.com/JChristensen/MCP79412RTC MCP79412RTC myRTC; void setup() { myRTC.begin(); delay(2000); Serial.begin(115200); setTime(23, 31, 30, 27, 4, 2022); // set the system time to 23h31m30s on 27Apr2022 // the setTime() function is from the Time.h library. // setTime(hour, minute, second, day, month, year); myRTC.set(now()); // set the RTC from the system time // sync the system time with the RTC every five minutes (by default) setSyncProvider([](){return myRTC.get();}); if (timeStatus() != timeSet) Serial.println("Unable to sync with the RTC"); else Serial.println("RTC has set the system time"); } void loop() { printTime(now()); delay(1000); } // Print time (and date) given a time_t value void printTime(time_t t) { printI00(hour(t), ':'); printI00(minute(t), ':'); printI00(second(t), ' '); Serial.print(dayShortStr(weekday(t))); Serial.print(' '); printI00(day(t), ' '); Serial.print(monthShortStr(month(t))); Serial.print(' '); Serial.println(year(t)); } // Print an integer in "00" format (with leading zero), // followed by a delimiter. // Input value assumed to be between 0 and 99. void printI00(int val, char delim) { if (val < 10) Serial.print('0'); Serial.print(val); Serial.print(delim); return; } MCP79412RTC-3.1.1/examples/rtcSet2/000077500000000000000000000000001503230562500162605ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/rtcSet2/rtcSet2.ino000066400000000000000000000032051503230562500203150ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Example sketch to set the RTC date and time to a hard-coded value, // using a tmElements_t structure. The same structure is then used to // read the RTC once per second. This sketch only uses the Time // library for the tmElements_t definition. // // This is just a simple demonstration of setting the RTC time. // Note that each time the sketch is run (or the microcontroller is // reset), the RTC will be set to the same hard-coded time, so this // example may be of limited usefulness as an actual clock. #include // https://github.com/JChristensen/MCP79412RTC MCP79412RTC myRTC; tmElements_t tm; void setup() { myRTC.begin(); delay(2000); Serial.begin(115200); tm.Hour = 23; // set the tm structure to 23h31m30s on 27Apr2022 tm.Minute = 31; tm.Second = 30; tm.Year = 2022 - 1970; // tmElements_t.Year is the offset from 1970. tm.Month = 4; tm.Day = 27; tm.Wday = dowFriday; // See enum in Time.h: Sun=1, Mon=2, ... Sat=7 myRTC.write(tm); // set the RTC from the tm structure } void loop() { myRTC.read(tm); Serial.print(tm.Hour, DEC); Serial.print(':'); Serial.print(tm.Minute,DEC); Serial.print(':'); Serial.print(tm.Second,DEC); Serial.print(' '); Serial.print(tm.Year + 1970, DEC); Serial.print('-'); Serial.print(tm.Month, DEC); Serial.print('-'); Serial.print(tm.Day, DEC); Serial.println(); delay(1000); } MCP79412RTC-3.1.1/examples/rtcSet3/000077500000000000000000000000001503230562500162615ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/rtcSet3/rtcSet3.ino000066400000000000000000000045411503230562500203230ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Example sketch to set the RTC date and time to the sketch compile // time. Re-running this sketch by pressing the reset button, etc., // will cause the RTC time to be reset to the *same* compile time. // Upload the sketch again to recompile it with the current time. #include // https://github.com/JChristensen/MCP79412RTC MCP79412RTC myRTC; time_t compileTime(const uint32_t fudge=10); // function prototype void setup() { myRTC.begin(); delay(2000); Serial.begin(115200); setTime(compileTime()); // set the system time to the sketch compile time myRTC.set(now()); // set the RTC from the system time } void loop() { printTime(now()); delay(1000); } // A function to return the compile date and time as a time_t value. // The fudge argument (seconds) is used to adjust for compile and upload time, YMMV. time_t compileTime(const uint32_t fudge) { //const uint32_t fudge(10); // fudge factor to allow for compile time (seconds, YMMV) const char *compDate = __DATE__, *compTime = __TIME__, *months = "JanFebMarAprMayJunJulAugSepOctNovDec"; char chMon[3], *m; tmElements_t tm; time_t t; strncpy(chMon, compDate, 3); chMon[3] = '\0'; m = strstr(months, chMon); tm.Month = ((m - months) / 3 + 1); tm.Day = atoi(compDate + 4); tm.Year = atoi(compDate + 7) - 1970; tm.Hour = atoi(compTime); tm.Minute = atoi(compTime + 3); tm.Second = atoi(compTime + 6); t = makeTime(tm); return t + fudge; // add fudge factor to allow for compile time } // Print time (and date) given a time_t value void printTime(time_t t) { printI00(hour(t), ':'); printI00(minute(t), ':'); printI00(second(t), ' '); Serial.print(dayShortStr(weekday(t))); Serial.print(' '); printI00(day(t), ' '); Serial.print(monthShortStr(month(t))); Serial.print(' '); Serial.println(year(t)); } // Print an integer in "00" format (with leading zero), // followed by a delimiter. // Input value assumed to be between 0 and 99. void printI00(int val, char delim) { if (val < 10) Serial.print('0'); Serial.print(val); Serial.print(delim); return; } MCP79412RTC-3.1.1/examples/rtc_interrupt/000077500000000000000000000000001503230562500176365ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/rtc_interrupt/rtc_interrupt.ino000066400000000000000000000064661503230562500232650ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Example sketch that uses a 1Hz interrupt from the RTC to keep time. // This is an alternative to using the "setSyncProvider" function from // the Time library to periodically sync the MCU's time with the RTC. // // Periodic synchronization will cause discontinuities in the MCU's perceived // time of day. Depending on the relative frequency of the MCU's clock compared to // that of the RTC, when synchronization occurs, a second according to the MCU's // time may appear to be longer or shorter than one RTC second. Alternately, the // MCU's time could jump backwards, or forward by more than a second. // // While this method requires setting up an interrupt and a few short // functions to handle the interrupt and to set and read the time, // it has the following advantages: (1) The MCU time is always exactly // in step with the RTC time and is not dependent on the MCU's clock // which will always drift relative to the RTC, and (2) It is more efficient // as the RTC's time is only read once over the I2C bus and the interrupt // service routine to increment the time is trivial. // // When using setSyncProvider and periodically synchronizing the MCU's time // with the RTC, we effectively have two clocks instead of one. // // Jack Christensen 27Dec2018 #include // http://github.com/JChristensen/MCP79412RTC constexpr uint8_t RTC_1HZ_PIN {3}; // RTC provides a 1Hz interrupt signal on this pin // Can use Pin 2 (INT0) or Pin 3 (INT1) with Arduino Uno MCP79412RTC myRTC; void setup() { Serial.begin(115200); Serial.println(F("\n" __FILE__ " " __DATE__ " " __TIME__)); pinMode(RTC_1HZ_PIN, INPUT_PULLUP); // enable pullup on interrupt pin (RTC SQW pin is open drain) attachInterrupt(digitalPinToInterrupt(RTC_1HZ_PIN), incrementTime, FALLING); myRTC.begin(); myRTC.squareWave(MCP79412RTC::SQWAVE_1_HZ); // 1 Hz square wave time_t utc = getUTC(); // synchronize with RTC while ( utc == getUTC() ); // wait for increment to the next second utc = myRTC.get(); // get the time from the RTC setUTC(utc); // set our time to the RTC's time Serial.println("Time set from RTC"); } void loop() { static time_t tLast; time_t t = getUTC(); if (t != tLast) { tLast = t; printTime(t); } } volatile time_t isrUTC; // ISR's copy of current time in UTC // return current time time_t getUTC() { noInterrupts(); time_t utc = isrUTC; interrupts(); return utc; } // set the current time void setUTC(time_t utc) { noInterrupts(); isrUTC = utc; interrupts(); } // 1Hz RTC interrupt handler increments the current time void incrementTime() { ++isrUTC; } // format and print a time_t value void printTime(time_t t) { char buf[25]; char m[4]; // temporary storage for month string (DateStrings.cpp uses shared buffer) strcpy(m, monthShortStr(month(t))); sprintf(buf, "%.2d:%.2d:%.2d %s %.2d %s %d", hour(t), minute(t), second(t), dayShortStr(weekday(t)), day(t), m, year(t)); Serial.println(buf); } MCP79412RTC-3.1.1/examples/rtc_wire1/000077500000000000000000000000001503230562500166315ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/rtc_wire1/rtc_wire1.ino000066400000000000000000000017441503230562500212450ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // rtc_wire1.ino // Example sketch with the RTC on the Wire1 bus. // Tested with Raspberry Pi Pico using the Arduino-Pico core, // https://github.com/earlephilhower/arduino-pico #include // http://github.com/JChristensen/MCP79412RTC constexpr int sdaPin {26}, sclPin {27}; // I2C pins for Wire1 (your pins may vary) MCP79412RTC myRTC(Wire1); void setup() { Serial.begin(115200); while (!Serial && millis() < 2000) delay(50); Wire1.setSDA(sdaPin); Wire1.setSCL(sclPin); myRTC.begin(); setSyncProvider([](){return myRTC.get();}); // the function to get the time from the RTC if (timeStatus() != timeSet) Serial.println("Unable to sync with the RTC"); else Serial.println("RTC has set the system time"); } void loop() { Serial.printf("%.4d-%.2d-%.2d %.2d:%.2d:%.2d\n", year(), month(), day(), hour(), minute(), second()); delay(1000); } MCP79412RTC-3.1.1/examples/tiny79412_KnockBang/000077500000000000000000000000001503230562500202415ustar00rootroot00000000000000MCP79412RTC-3.1.1/examples/tiny79412_KnockBang/tiny79412_KnockBang.ino000066400000000000000000000047171503230562500242700ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Example sketch. Digital clock display using an MCP79412 Real-Time // Clock/Calendar and an ATtiny45/85 with a 1MHz system clock. // // Tested with Arduino 1.8.5, and: // ATTinyCore, https://github.com/SpenceKonde/ATTinyCore // TinyISP, https://github.com/Coding-Badly/TinyISP // // Disable Link Time Optimization (LTO) as it causes compile errors (there // are still some warnings.) // // Run TinyISP on an ATmega microcontroller that does not have an LED // connected to pin 13 (SCK). The LED causes problems because the SPI // pins are also the I2C pins on the ATtiny. Connect MISO, MOSI, SCK // on the ATmega to the corresponding pins on the ATtiny through 220Ω // resistors for safety. Use 4.7k pullup resistors on the ATtiny // I2C bus. // // Jack Christensen 21Aug2013 #include // https://github.com/JChristensen/MCP79412RTC #include // https://github.com/PaulStoffregen/Time #include // https://github.com/Coding-Badly/TinyDebugKnockBang MCP79412RTC myRTC; void setup() { myRTC.begin(); Debug.begin(250000); // setSyncProvider() causes the Time library to synchronize with the // external RTC by calling RTC.get() every five minutes by default. setSyncProvider([](){return myRTC.get();}); Debug.print(F("RTC Sync")); if (timeStatus() != timeSet) Debug.print(F(" FAIL!")); Debug.println(); } void loop() { static time_t tLast; time_t t = now(); if (t != tLast) { tLast = t; printDateTime(t); Debug.println(); } } // print date and time to Serial void printDateTime(time_t t) { printDate(t); Debug.print(' '); printTime(t); } // print time to Serial void printTime(time_t t) { printI00(hour(t), ':'); printI00(minute(t), ':'); printI00(second(t), ' '); } // print date to Serial void printDate(time_t t) { printI00(day(t), 0); Debug.print(monthShortStr(month(t))); Debug.print(year(t), DEC); } // Print an integer in "00" format (with leading zero), // followed by a delimiter character to Serial. // Input value assumed to be between 0 and 99. void printI00(int val, char delim) { if (val < 10) Debug.print('0'); Debug.print(val, DEC);; if (delim > 0) Debug.print(delim); return; } MCP79412RTC-3.1.1/keywords.txt000066400000000000000000000030131503230562500155210ustar00rootroot00000000000000# datatypes MCP79412RTC KEYWORD1 # methods & functions begin KEYWORD2 get KEYWORD2 set KEYWORD2 read KEYWORD2 write KEYWORD2 sramWrite KEYWORD2 sramRead KEYWORD2 eepromWrite KEYWORD2 eepromRead KEYWORD2 calibRead KEYWORD2 calibWrite KEYWORD2 idRead KEYWORD2 getEUI64 KEYWORD2 powerFail KEYWORD2 squareWave KEYWORD2 setAlarm KEYWORD2 enableAlarm KEYWORD2 alarm KEYWORD2 out KEYWORD2 alarmPolarity KEYWORD2 isRunning KEYWORD2 vbaten KEYWORD2 dumpRegs KEYWORD2 dumpSRAM KEYWORD2 dumpEEPROM KEYWORD2 # constants ALM_MATCH_SECONDS LITERAL1 ALM_MATCH_MINUTES LITERAL1 ALM_MATCH_HOURS LITERAL1 ALM_MATCH_DAY LITERAL1 ALM_MATCH_DATE LITERAL1 ALM_MATCH_DATETIME LITERAL1 ALM_DISABLE LITERAL1 SQWAVE_1_HZ LITERAL1 SQWAVE_4096_HZ LITERAL1 SQWAVE_8192_HZ LITERAL1 SQWAVE_32768_HZ LITERAL1 SQWAVE_NONE LITERAL1 ALARM_0 LITERAL1 ALARM_1 LITERAL1 RTC_ADDR LITERAL1 EEPROM_ADDR LITERAL1 RTCSEC LITERAL1 RTCWKDAY LITERAL1 RTCYEAR LITERAL1 CONTROL LITERAL1 OSCTRIM LITERAL1 EEUNLOCK LITERAL1 ALM0SEC LITERAL1 ALM1SEC LITERAL1 ALM0WKDAY LITERAL1 PWRDNMIN LITERAL1 PWRUPMIN LITERAL1 TIMESTAMP_SIZE LITERAL1 SRAM_START_ADDR LITERAL1 SRAM_SIZE LITERAL1 EEPROM_SIZE LITERAL1 EEPROM_PAGE_SIZE LITERAL1 UNIQUE_ID_ADDR LITERAL1 UNIQUE_ID_SIZE LITERAL1 OUT LITERAL1 SQWEN LITERAL1 ALM1EN LITERAL1 ALM0EN LITERAL1 EXTOSC LITERAL1 CRSTRIM LITERAL1 SQWFS1 LITERAL1 SQWFS0 LITERAL1 STOSC LITERAL1 HR1224 LITERAL1 AMPM LITERAL1 OSCRUN LITERAL1 PWRFAIL LITERAL1 VBATEN LITERAL1 LPYR LITERAL1 ALMPOL LITERAL1 ALMxMSK2 LITERAL1 ALMxMSK1 LITERAL1 ALMxMSK0 LITERAL1 ALMxIF LITERAL1 MCP79412RTC-3.1.1/library.properties000066400000000000000000000006371503230562500167040ustar00rootroot00000000000000name=MCP79412RTC version=3.1.1 author=Jack Christensen maintainer=Jack Christensen sentence=Arduino library for the Microchip MCP79411/12 Real-Time Clock/Calendar. paragraph=Requires PJRC's improved Arduino Time Library, https://github.com/PaulStoffregen/Time category=Timing url=https://github.com/JChristensen/MCP79412RTC architectures=* depends=Time MCP79412RTC-3.1.1/src/000077500000000000000000000000001503230562500137035ustar00rootroot00000000000000MCP79412RTC-3.1.1/src/GenericRTC.h000066400000000000000000000023161503230562500160030ustar00rootroot00000000000000// Abtract base class for: // Arduino DS3232RTC Library https://github.com/JChristensen/DS3232RTC // and Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2025 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Allows a sketch to work with either type of RTC, can be determined at run time. #ifndef GENERIC_RTC_H_INCLUDED #define GENERIC_RTC_H_INCLUDED #include #include // https://github.com/PaulStoffregen/Time #include class GenericRTC { public: GenericRTC(TwoWire& tw=Wire) : wire(tw) {}; virtual void begin() = 0; virtual time_t get() = 0; virtual uint8_t set(const time_t t) = 0; virtual uint8_t writeRTC(const uint8_t addr, const uint8_t* values, const uint8_t nBytes) = 0; virtual uint8_t writeRTC(const uint8_t addr, const uint8_t value) = 0; virtual uint8_t readRTC(const uint8_t addr, uint8_t* values, const uint8_t nBytes) = 0; virtual uint8_t readRTC(const uint8_t addr) = 0; virtual int16_t temperature() {return 0;}; protected: TwoWire& wire; // reference to Wire, Wire1, etc. }; #endif MCP79412RTC-3.1.1/src/MCP79412RTC.cpp000066400000000000000000000563221503230562500160160ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Arduino library for the Microchip MCP7941x Real-Time Clocks. // Requires PJRC's improved version of the Arduino Time Library, // https://playground.arduino.cc/Code/Time // https://github.com/PaulStoffregen/Time // // For AVR architecture, an MCP79412RTC object named RTC is instantiated // by the library and I2C initialization occurs in the constructor; // this is for backwards compatibility. // For other architectures, the user needs to instantiate a MCP79412RTC // object and optionally initialize the I2C bus by calling // MCP79412RTC::begin(). The constructor has an optional bool parameter // to indicate whether I2C initialization should occur in the // constructor; this parameter defaults to true if not given. #include // Initialize the I2C bus. void MCP79412RTC::begin() { i2cBegin(); } // Read the current time from the RTC and return it as a time_t value. // Returns a zero value if RTC not present (I2C I/O error). time_t MCP79412RTC::get() { tmElements_t tm; if ( read(tm) ) return( makeTime(tm) ); else return 0; } // Set the RTC to the given time_t value. // Returns the I2C status (zero if successful). uint8_t MCP79412RTC::set(const time_t t) { tmElements_t tm; breakTime(t, tm); return ( write(tm) ); } // Read the current time from the RTC and return it in a tmElements_t // structure. Returns false if RTC not present (I2C I/O error). bool MCP79412RTC::read(tmElements_t& tm) { i2cBeginTransmission(RTC_ADDR); i2cWrite(RTCSEC); if (i2cEndTransmission() != 0) { return false; } else { // request 7 bytes (secs, min, hr, dow, date, mth, yr) i2cRequestFrom(RTC_ADDR, static_cast(tmNbrFields)); tm.Second = bcd2dec(i2cRead() & ~_BV(STOSC)); tm.Minute = bcd2dec(i2cRead()); tm.Hour = bcd2dec(i2cRead() & ~_BV(HR1224)); // assumes 24hr clock tm.Wday = i2cRead() & ~(_BV(OSCRUN) | _BV(PWRFAIL) | _BV(VBATEN)); // mask off OSCRUN, PWRFAIL, VBATEN bits tm.Day = bcd2dec(i2cRead()); tm.Month = bcd2dec(i2cRead() & ~_BV(LPYR)); // mask off the leap year bit tm.Year = y2kYearToTm(bcd2dec(i2cRead())); return true; } } // Set the RTC's time from a tmElements_t structure. uint8_t MCP79412RTC::write(const tmElements_t& tm) { i2cBeginTransmission(RTC_ADDR); i2cWrite(RTCSEC); i2cWrite(0x00); // stops the oscillator (Bit 7, STOSC == 0) i2cWrite(dec2bcd(tm.Minute)); i2cWrite(dec2bcd(tm.Hour)); // sets 24 hour format (Bit 6 == 0) i2cWrite(tm.Wday | _BV(VBATEN)); // enable battery backup operation i2cWrite(dec2bcd(tm.Day)); i2cWrite(dec2bcd(tm.Month)); i2cWrite(dec2bcd(tmYearToY2k(tm.Year))); i2cEndTransmission(); i2cBeginTransmission(RTC_ADDR); i2cWrite(RTCSEC); i2cWrite(dec2bcd(tm.Second) | _BV(STOSC)); // set the seconds and start the oscillator (Bit 7, STOSC == 1) uint8_t ret = i2cEndTransmission(); return ret; } // Write a single byte to RTC RAM. // Valid address range is 0x00 - 0x5F, no checking. uint8_t MCP79412RTC::writeRTC(const uint8_t addr, const uint8_t value) { return ( writeRTC(addr, &value, 1) ); } // Write multiple bytes to RTC RAM. // Valid address range is 0x00 - 0x5F, no checking. // Number of bytes (nBytes) must be between 1 and 31 (Wire library // limitation). uint8_t MCP79412RTC::writeRTC(const uint8_t addr, const uint8_t* values, const uint8_t nBytes) { i2cBeginTransmission(RTC_ADDR); i2cWrite(addr); for (uint8_t i=0; i= 1 && (addr + nBytes) <= SRAM_SIZE) { #else if (nBytes >= 1 && nBytes <= (BUFFER_LENGTH - 1) && (addr + nBytes) <= SRAM_SIZE) { #endif writeRTC( (addr & (SRAM_SIZE - 1) ) + SRAM_START_ADDR, values, nBytes ); } } // Read a single byte from Static RAM. // Address (addr) is constrained to the range (0, 63). uint8_t MCP79412RTC::sramRead(const uint8_t addr) { uint8_t value; readRTC( (addr & (SRAM_SIZE - 1) ) + SRAM_START_ADDR, &value, 1 ); return value; } // Read multiple bytes from Static RAM. // Address (addr) is constrained to the range (0, 63). // Number of bytes (nBytes) must be between 1 and 32 (Wire library // limitation). // Invalid values for nBytes, or combinations of addr and // nBytes that would result in addressing past the last byte of SRAM // result in no action. void MCP79412RTC::sramRead(const uint8_t addr, uint8_t* values, const uint8_t nBytes) { #if defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__) if (nBytes >= 1 && (addr + nBytes) <= SRAM_SIZE) { #else if (nBytes >= 1 && nBytes <= BUFFER_LENGTH && (addr + nBytes) <= SRAM_SIZE) { #endif readRTC((addr & (SRAM_SIZE - 1) ) + SRAM_START_ADDR, values, nBytes); } } // Write a single byte to EEPROM. // Address (addr) is constrained to the range (0, 127). // Can't leverage page write function because a write can't start // mid-page. void MCP79412RTC::eepromWrite(const uint8_t addr, const uint8_t value) { i2cBeginTransmission(EEPROM_ADDR); i2cWrite( addr & (EEPROM_SIZE - 1) ); i2cWrite(value); i2cEndTransmission(); eepromWait(); } // Write a page (or less) to EEPROM. An EEPROM page is 8 bytes. // Address (addr) should be a page start address (0, 8, ..., 120), but // is ruthlessly coerced into a valid value. // Number of bytes (nBytes) must be between 1 and 8, other values // result in no action. void MCP79412RTC::eepromWrite(const uint8_t addr, const uint8_t* values, const uint8_t nBytes) { if (nBytes >= 1 && nBytes <= EEPROM_PAGE_SIZE) { i2cBeginTransmission(EEPROM_ADDR); i2cWrite( addr & ~(EEPROM_PAGE_SIZE - 1) & (EEPROM_SIZE - 1) ); for (uint8_t i=0; i= 1 && (addr + nBytes) <= EEPROM_SIZE) { #else if (nBytes >= 1 && nBytes <= BUFFER_LENGTH && (addr + nBytes) <= EEPROM_SIZE) { #endif i2cBeginTransmission(EEPROM_ADDR); i2cWrite( addr & (EEPROM_SIZE - 1) ); i2cEndTransmission(); i2cRequestFrom(EEPROM_ADDR, nBytes); for (uint8_t i=0; i= -127 && value <= 127) { uint8_t calibVal = abs(value); if (value < 0) calibVal += 128; writeRTC(OSCTRIM, calibVal); } } // Read the unique ID. // For the MCP79411 (EUI-48), the first two bytes will contain 0xFF. // Caller must provide an 8-byte array to contain the results. void MCP79412RTC::idRead(uint8_t* uniqueID) { i2cBeginTransmission(EEPROM_ADDR); i2cWrite(UNIQUE_ID_ADDR); i2cEndTransmission(); i2cRequestFrom( EEPROM_ADDR, UNIQUE_ID_SIZE ); for (uint8_t i=0; i *powerUp) { --dn.Year; *powerDown = makeTime(dn); } return true; } else return false; } // Enable or disable the square wave output. void MCP79412RTC::squareWave(const SQWAVE_FREQS_t freq) { uint8_t ctrlReg; readRTC(CONTROL, &ctrlReg, 1); if (freq > 3) { ctrlReg &= ~_BV(SQWEN); } else { ctrlReg = (ctrlReg & 0xF8) | _BV(SQWEN) | freq; } writeRTC(CONTROL, &ctrlReg, 1); } // Set an alarm to the given time_t value. Sets the alarm registers only, // does not enable the alarm. See enableAlarm(). void MCP79412RTC::setAlarm(const ALARM_NBR_t alarmNumber, const time_t alarmTime) { uint8_t day; // need to preserve bits in the day (of week) register readRTC( ALM0WKDAY + alarmNumber * (ALM1SEC - ALM0SEC), &day, 1); tmElements_t tm; breakTime(alarmTime, tm); i2cBeginTransmission(RTC_ADDR); i2cWrite( ALM0SEC + alarmNumber * (ALM1SEC - ALM0SEC) ); i2cWrite(dec2bcd(tm.Second)); i2cWrite(dec2bcd(tm.Minute)); i2cWrite(dec2bcd(tm.Hour)); // sets 24 hour format (Bit 6 == 0) i2cWrite( (day & 0xF8) + tm.Wday ); i2cWrite(dec2bcd(tm.Day)); i2cWrite(dec2bcd(tm.Month)); i2cEndTransmission(); } // Set an alarm by specifying year, month, day, hour, minute, second. // While the RTC does not use year for alarms, it's important to use the // correct year to ensure the day of the week is calculated correctly. This // is important especially if a day of week alarm will be used. // Use a four-digit year, including century e.g. CCYY. void MCP79412RTC::setAlarm(const ALARM_NBR_t alarmNumber, const uint16_t y, const uint8_t mon, const uint8_t d, const uint8_t h, const uint8_t m, const uint8_t s) { tmElements_t tm; tm.Year = CalendarYrToTm(y); tm.Month = mon; tm.Day = d; tm.Hour = h; tm.Minute = m; tm.Second = s; setAlarm(alarmNumber, makeTime(tm)); } // Enable or disable an alarm, and set the trigger criteria, // e.g. match only seconds, only minutes, entire time and date, etc. void MCP79412RTC::enableAlarm(const ALARM_NBR_t alarmNumber, const ALARM_TYPES_t alarmType) { uint8_t ctrl; // control register has alarm enable bits readRTC(CONTROL, &ctrl, 1); if (alarmType < ALM_DISABLE) { uint8_t day; // alarm day register has config & flag bits readRTC(ALM0WKDAY + alarmNumber * (ALM1SEC - ALM0SEC), &day, 1); day = ( day & 0x87 ) | alarmType << 4; // reset interrupt flag, OR in the config bits writeRTC(ALM0WKDAY + alarmNumber * (ALM1SEC - ALM0SEC), &day, 1); ctrl |= _BV(ALM0EN + alarmNumber); // enable the alarm } else { ctrl &= ~(_BV(ALM0EN + alarmNumber)); // disable the alarm } writeRTC(CONTROL, &ctrl, 1); } // Returns true or false depending on whether the given alarm has been // triggered, and resets the alarm "interrupt" flag. This is not a real // interrupt, just a bit that's set when an alarm is triggered. bool MCP79412RTC::alarm(const ALARM_NBR_t alarmNumber) { uint8_t day; // alarm day register has config & flag bits readRTC( ALM0WKDAY + alarmNumber * (ALM1SEC - ALM0SEC), &day, 1); if (day & _BV(ALMxIF)) { day &= ~_BV(ALMxIF); // turn off the alarm "interrupt" flag writeRTC( ALM0WKDAY + alarmNumber * (ALM1SEC - ALM0SEC), &day, 1); return true; } else return false; } // Sets the logic level on the MFP when it's not being used as a // square wave or alarm output. The default is HIGH. void MCP79412RTC::out(const bool level) { uint8_t ctrlReg; readRTC(CONTROL, &ctrlReg, 1); if (level) ctrlReg |= _BV(OUT); else ctrlReg &= ~_BV(OUT); writeRTC(CONTROL, &ctrlReg, 1); } // Specifies the logic level on the Multi-Function Pin (MFP) when an // alarm is triggered. The default is LOW. When both alarms are // active, the two are ORed together to determine the level of the MFP. // With alarm polarity set to LOW (the default), this causes the MFP // to go low only when BOTH alarms are triggered. With alarm polarity // set to HIGH, the MFP will go high when EITHER alarm is triggered. // // Note that the state of the MFP is independent of the alarm // "interrupt" flags, and the alarm() function will indicate when an // alarm is triggered regardless of the polarity. void MCP79412RTC::alarmPolarity(const bool polarity) { uint8_t alm0Day; readRTC(ALM0WKDAY, &alm0Day, 1); if (polarity) alm0Day |= _BV(ALMPOL); else alm0Day &= ~_BV(ALMPOL); writeRTC(ALM0WKDAY, &alm0Day, 1); } // Check to see if the RTC's oscillator is started (STOSC bit in seconds // register). Returns true if started. bool MCP79412RTC::isRunning() { i2cBeginTransmission(RTC_ADDR); i2cWrite(RTCSEC); i2cEndTransmission(); // request just the seconds register i2cRequestFrom(RTC_ADDR, static_cast(1)); return i2cRead() & _BV(STOSC); } // Set or clear the VBATEN bit. Setting the bit powers the clock and // SRAM from the backup battery when Vcc falls. Note that setting the // time via set() or write() sets the VBATEN bit. void MCP79412RTC::vbaten(const bool enable) { uint8_t day; readRTC(RTCWKDAY, &day, 1); if (enable) day |= _BV(VBATEN); else day &= ~_BV(VBATEN); writeRTC(RTCWKDAY, &day, 1); return; } // Decimal-to-BCD conversion uint8_t MCP79412RTC::dec2bcd(const uint8_t n) { return n + 6 * (n / 10); } // BCD-to-Decimal conversion uint8_t __attribute__ ((noinline)) MCP79412RTC::bcd2dec(const uint8_t n) { return n - 6 * (n >> 4); } // dump rtc registers, 16 bytes at a time. // always dumps a multiple of 16 bytes. // duplicate rows are suppressed and indicated with an asterisk. void MCP79412RTC::dumpRegs(const uint32_t startAddr, const uint32_t nBytes) { Serial.print(F("\nRTC REGISTERS\n")); uint32_t nRows = (nBytes + 15) >> 4; uint8_t d[16], last[16]; uint32_t aLast {startAddr}; for (uint32_t r = 0; r < nRows; r++) { uint32_t a = startAddr + 16 * r; readRTC(a, d, 16); bool same {true}; for (int i=0; i<16; ++i) { if (last[i] != d[i]) same = false; } if (!same || r == 0 || r == nRows-1) { Serial.print(F("0x")); if ( a < 16 * 16 * 16 ) Serial.print('0'); if ( a < 16 * 16 ) Serial.print('0'); if ( a < 16 ) Serial.print('0'); Serial.print(a, HEX); Serial.print(a == aLast+16 || r == 0 ? " " : "* "); for ( int16_t c = 0; c < 16; c++ ) { if ( d[c] < 16 ) Serial.print('0'); Serial.print(d[c], HEX); Serial.print(c == 7 ? " " : " " ); } Serial.println(); aLast = a; } for (int i=0; i<16; ++i) { last[i] = d[i]; } } } // dump rtc sram, 16 bytes at a time. // always dumps a multiple of 16 bytes. // duplicate rows are suppressed and indicated with an asterisk. void MCP79412RTC::dumpSRAM(const uint32_t startAddr, const uint32_t nBytes) { Serial.print(F("\nRTC SRAM\n")); uint32_t nRows = (nBytes + 15) >> 4; uint8_t d[16], last[16]; uint32_t aLast {startAddr}; for (uint32_t r = 0; r < nRows; r++) { uint32_t a = startAddr + 16 * r; sramRead(a, d, 16); bool same {true}; for (int i=0; i<16; ++i) { if (last[i] != d[i]) same = false; } if (!same || r == 0 || r == nRows-1) { Serial.print(F("0x")); if ( a < 16 * 16 * 16 ) Serial.print('0'); if ( a < 16 * 16 ) Serial.print('0'); if ( a < 16 ) Serial.print('0'); Serial.print(a, HEX); Serial.print(a == aLast+16 || r == 0 ? " " : "* "); for ( int16_t c = 0; c < 16; c++ ) { if ( d[c] < 16 ) Serial.print('0'); Serial.print(d[c], HEX); Serial.print(c == 7 ? " " : " " ); } Serial.println(); aLast = a; } for (int i=0; i<16; ++i) { last[i] = d[i]; } } } // dump rtc eeprom, 16 bytes at a time. // always dumps a multiple of 16 bytes. // duplicate rows are suppressed and indicated with an asterisk. void MCP79412RTC::dumpEEPROM(const uint32_t startAddr, const uint32_t nBytes) { Serial.print(F("\nRTC EEPROM\n")); uint32_t nRows = (nBytes + 15) >> 4; uint8_t d[16], last[16]; uint32_t aLast {startAddr}; for (uint32_t r = 0; r < nRows; r++) { uint32_t a = startAddr + 16 * r; eepromRead(a, d, 16); bool same {true}; for (int i=0; i<16; ++i) { if (last[i] != d[i]) same = false; } if (!same || r == 0 || r == nRows-1) { Serial.print(F("0x")); if ( a < 16 * 16 * 16 ) Serial.print('0'); if ( a < 16 * 16 ) Serial.print('0'); if ( a < 16 ) Serial.print('0'); Serial.print(a, HEX); Serial.print(a == aLast+16 || r == 0 ? " " : "* "); for ( int16_t c = 0; c < 16; c++ ) { if ( d[c] < 16 ) Serial.print('0'); Serial.print(d[c], HEX); Serial.print(c == 7 ? " " : " " ); } Serial.println(); aLast = a; } for (int i=0; i<16; ++i) { last[i] = d[i]; } } } MCP79412RTC-3.1.1/src/MCP79412RTC.h000066400000000000000000000211571503230562500154610ustar00rootroot00000000000000// Arduino MCP79412RTC Library // https://github.com/JChristensen/MCP79412RTC // Copyright (C) 2018 by Jack Christensen and licensed under // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html // // Arduino library for the Microchip MCP7941x Real-Time Clocks. // Requires PJRC's improved version of the Arduino Time Library, // https://playground.arduino.cc/Code/Time // https://github.com/PaulStoffregen/Time // // For AVR architecture, an MCP79412RTC object named RTC is instantiated // by the library and I2C initialization occurs in the constructor; // this is for backwards compatibility. // For other architectures, the user needs to instantiate a MCP79412RTC // object and optionally initialize the I2C bus by calling // MCP79412RTC::begin(). The constructor has an optional bool parameter // to indicate whether I2C initialization should occur in the // constructor; this parameter defaults to true if not given. #ifndef MCP79412RTC_H_INCLUDED #define MCP79412RTC_H_INCLUDED #include #include // https://github.com/PaulStoffregen/Time #include // define consistent I2C functions #if defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__) #include #define i2cBegin TinyWireM.begin #define i2cBeginTransmission TinyWireM.beginTransmission #define i2cEndTransmission TinyWireM.endTransmission #define i2cRequestFrom TinyWireM.requestFrom #define i2cRead TinyWireM.receive #define i2cWrite TinyWireM.send #else #include #define i2cBegin wire.begin #define i2cBeginTransmission wire.beginTransmission #define i2cEndTransmission wire.endTransmission #define i2cRequestFrom wire.requestFrom #define i2cRead wire.read #define i2cWrite wire.write #endif #ifndef _BV #define _BV(bit) (1 << (bit)) #endif #ifndef BUFFER_LENGTH // a horrible and limiting kludge for samd (arduino zero) #define BUFFER_LENGTH 32 #endif class MCP79412RTC : public GenericRTC { public: // Alarm types for use with the enableAlarm() function enum ALARM_TYPES_t { ALM_MATCH_SECONDS, ALM_MATCH_MINUTES, ALM_MATCH_HOURS, ALM_MATCH_DAY, // triggers alarm at midnight ALM_MATCH_DATE, ALM_RESERVED_5, // do not use ALM_RESERVED_6, // do not use ALM_MATCH_DATETIME, ALM_DISABLE }; // Square-wave output frequencies for use with squareWave() function enum SQWAVE_FREQS_t { SQWAVE_1_HZ, SQWAVE_4096_HZ, SQWAVE_8192_HZ, SQWAVE_32768_HZ, SQWAVE_NONE }; // constants for use with alarm functions enum ALARM_NBR_t { ALARM_0, ALARM_1 }; // MCP7941x I2C Addresses static constexpr uint8_t RTC_ADDR {0x6F}, EEPROM_ADDR {0x57}; // MCP7941x Register Addresses static constexpr uint8_t RTCSEC {0x00}, // 7 registers, Seconds, Minutes, Hours, DOW, Date, Month, Year RTCWKDAY {0x03}, // the RTC Day register contains the OSCRUN, PWRFAIL, and VBATEN bits RTCYEAR {0x06}, // RTC year register CONTROL {0x07}, // control register OSCTRIM {0x08}, // oscillator calibration register EEUNLOCK {0x09}, // protected eeprom unlock register ALM0SEC {0x0A}, // alarm 0, 6 registers, Seconds, Minutes, Hours, DOW, Date, Month ALM1SEC {0x11}, // alarm 1, 6 registers, Seconds, Minutes, Hours, DOW, Date, Month ALM0WKDAY {0x0D}, // DOW register has alarm config/flag bits PWRDNMIN {0x18}, // power-down timestamp, 4 registers, Minutes, Hours, Date, Month PWRUPMIN {0x1C}, // power-up timestamp, 4 registers, Minutes, Hours, Date, Month TIMESTAMP_SIZE {8}, // number of bytes in the two timestamp registers SRAM_START_ADDR {0x20}, // first SRAM address SRAM_SIZE {64}, // number of bytes of SRAM EEPROM_SIZE {128}, // number of bytes of EEPROM EEPROM_PAGE_SIZE{8}, // number of bytes on an EEPROM page UNIQUE_ID_ADDR {0xF0}, // starting address for unique ID in EEPROM UNIQUE_ID_SIZE {8}; // number of bytes in unique ID // Control Register bits static constexpr uint8_t OUT {7}, // sets logic level on MFP when not used as square wave output SQWEN {6}, // set to enable square wave output ALM1EN {5}, // alarm 1 is active ALM0EN {4}, // alarm 0 is active EXTOSC {3}, // enable external oscillator instead of a crystal CRSTRIM {2}, // coarse trim mode enable SQWFS1 {1}, // SQWFS1:0 square wave output freq: 0==1Hz, 1==4096Hz, 2==8192Hz, 3=32768Hz SQWFS0 {0}; // Other Control Bits static constexpr uint8_t STOSC {7}, // Seconds register (RTCSEC) oscillator start/stop bit, 1==Start, 0==Stop HR1224 {6}, // Hours register (RTCHOUR) 12 or 24 hour mode (24 hour mode==0) AMPM {5}, // Hours register (RTCHOUR) AM/PM bit for 12 hour mode OSCRUN {5}, // Day register (RTCWKDAY) oscillator running (set and cleared by hardware) PWRFAIL {4}, // Day register (RTCWKDAY) set by hardware when Vcc fails and RTC runs on battery. // PWRFAIL is cleared by software, clearing PWRFAIL also // clears the timestamp registers VBATEN {3}, // Day register (RTCWKDAY) VBATEN==1 enables backup // battery, VBATEN==0 disconnects the VBAT pin (e.g. to save battery) LPYR {5}; // Month register (RTCMTH) leap year bit // Alarm Control Bits static constexpr uint8_t ALMPOL {7}, // Alarm Polarity: Defines the logic level for the MFP when an alarm is triggered. ALMxMSK2 {6}, // Alarm configuration bits determine how alarms match. See ALARM_TYPES_t enum. ALMxMSK1 {5}, ALMxMSK0 {4}, ALMxIF {3}; // Alarm Interrupt Flag: Set by hardware when an alarm was triggered, cleared by software. MCP79412RTC(TwoWire& tw=Wire) : GenericRTC{tw} {}; void begin(); time_t get(); uint8_t set(const time_t t); bool read(tmElements_t& tm); uint8_t write(const tmElements_t& tm); void sramWrite(const uint8_t addr, const uint8_t value); void sramWrite(const uint8_t addr, const uint8_t* values, const uint8_t nBytes); uint8_t sramRead(const uint8_t addr); void sramRead(const uint8_t addr, uint8_t* values, const uint8_t nBytes); void eepromWrite(const uint8_t addr, const uint8_t value); void eepromWrite(const uint8_t addr, const uint8_t* values, const uint8_t nBytes); uint8_t eepromRead(const uint8_t addr); void eepromRead(const uint8_t addr, uint8_t* values, const uint8_t nBytes); int16_t calibRead(); void calibWrite(const int16_t value); void idRead(uint8_t* uniqueID); void getEUI64(uint8_t* uniqueID); bool powerFail(time_t* powerDown, time_t* powerUp); void squareWave(const SQWAVE_FREQS_t freq); void setAlarm(const ALARM_NBR_t alarmNumber, const time_t alarmTime); void setAlarm(const ALARM_NBR_t alarmNumber, const uint16_t y, const uint8_t mon, const uint8_t d, const uint8_t h, const uint8_t m, const uint8_t s); void enableAlarm(const ALARM_NBR_t alarmNumber, const ALARM_TYPES_t alarmType); bool alarm(const ALARM_NBR_t alarmNumber); void out(const bool level); void alarmPolarity(const bool polarity); bool isRunning(); void vbaten(const bool enable); void dumpRegs(const uint32_t startAddr=0, const uint32_t nBytes=32); void dumpSRAM(const uint32_t startAddr=0, const uint32_t nBytes=64); void dumpEEPROM(const uint32_t startAddr=0, const uint32_t nBytes=128); uint8_t writeRTC(const uint8_t addr, const uint8_t* values, const uint8_t nBytes); uint8_t writeRTC(const uint8_t addr, const uint8_t value); uint8_t readRTC(const uint8_t addr, uint8_t* values, const uint8_t nBytes); uint8_t readRTC(const uint8_t addr); private: //TwoWire& wire; // reference to Wire, Wire1, etc. uint8_t eepromWait(); uint8_t dec2bcd(const uint8_t num); uint8_t bcd2dec(const uint8_t num); }; #endif