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tenbahttenbaht
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allow to deactivate serial, analog in and analog out by compile parameter
1 parent 0ba35bc commit 453ea74

4 files changed

Lines changed: 61 additions & 17 deletions

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‎docs/api.md‎

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@@ -161,6 +161,28 @@ timer2: PWM for PA3, PD3, PD4 or PC5 (mutual exclusive)
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timer4: millis()
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### Leaving out unused parts
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Some functions of the core Arduino system can be left out on compilation to
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save code space. This is done by compiler flags that can be defined in the
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Makefile:
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```make
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BOARD_TAG = stm8sblue
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CFLAGS = -DNO_SERIAL -DNO_ANALOG_IN -DNO_ANALOG_OUT
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include ../../../sduino.mk
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```
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These flags are supported:
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Flag | Bytes saved | Functions lost
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----- | -------: | ---------
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NO_SERIAL | 765 | all serial communication
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NO_ANALOG_OUT | 406 | analogWrite()
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NO_ANALOG_IN | 56 | analogRead()
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### Other modifications
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‎sduino/hardware/sduino/stm8/cores/sduino/HardwareSerial.c‎

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@@ -31,20 +31,6 @@
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#include "HardwareSerial.h"
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#define SERIAL_BUFFER_SIZE 16
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typedef struct ring_buffer
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{
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unsigned char buffer[SERIAL_BUFFER_SIZE];
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volatile unsigned int head;
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volatile unsigned int tail;
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} ring_buffer;
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static ring_buffer rx_buffer;// = { { 0 }, 0, 0};
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static ring_buffer tx_buffer;// = { { 0 }, 0, 0};
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static volatile char transmitting;//=0;
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static unsigned char initialized;//=0 internal status. Returned on HardwareSerial()
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// device dependent definitions ////////////////////////////////////////////
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#if defined(UART1)
@@ -120,7 +106,34 @@ static unsigned char initialized;//=0 internal status. Returned on HardwareSeria
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#endif
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// private functions //////////////////////////////////////////////////////////
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#ifdef NO_SERIAL
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/*
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* empty default IRQ functions to make the linker happy if the
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* respective module is not to linked.
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*/
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void UARTx_TX_IRQHandler(void) __interrupt(ITC_IRQ_UARTx_TX){}
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void UARTx_RX_IRQHandler(void) __interrupt(ITC_IRQ_UARTx_RX){}
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#else // ifdef NO_SERIAL
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// private data //////////////////////////////////////////////////////////////
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#define SERIAL_BUFFER_SIZE 16
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typedef struct ring_buffer
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{
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unsigned char buffer[SERIAL_BUFFER_SIZE];
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volatile unsigned int head;
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volatile unsigned int tail;
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} ring_buffer;
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static ring_buffer rx_buffer;// = { { 0 }, 0, 0};
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static ring_buffer tx_buffer;// = { { 0 }, 0, 0};
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static volatile char transmitting;//=0;
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static unsigned char initialized;//=0 internal status. Returned on HardwareSerial()
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// private functions ////////////////////////////////////////////////////////
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static void store_char(unsigned char c, ring_buffer *buffer)
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//inline void store_char(unsigned char c, ring_buffer *buffer)
@@ -347,3 +360,5 @@ size_t HardwareSerial_write(uint8_t c)
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return 1;
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}
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#endif // ifdef NO_SERIAL

‎sduino/hardware/sduino/stm8/cores/sduino/wiring.c‎

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Original file line numberDiff line numberDiff line change
@@ -501,7 +501,7 @@ void init()
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// this is better for motors as it ensures an even waveform
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// note, however, that fast pwm mode can achieve a frequency of up
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// 8 MHz (with a 16 MHz clock) at 50% duty cycle
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#ifndef NO_ANALOG_OUT
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TIM1_DeInit(); // keep this
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// actual prescaler is (n+1)
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TIM1_TimeBaseInit(63, TIM1_COUNTERMODE_UP, 255, 0); // keep this
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TIM3->CR1 = TIM3_CR1_CEN; // TIM1_Cmd(ENABLE);
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#endif
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#endif // #ifdef (TIM3)
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#endif // ifndef NO_ANALOG_OUT
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#ifndef NO_ANALOG_IN
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/* De-Init ADC peripheral, sets prescaler to 2 */
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ADC1_DeInit();
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// optional:
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// #else // minimum prescaler is 2, already set by ADC1_DeInit();
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// ADC1->CR1 = 0 <<4;
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#endif
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#endif // ifndef NO_ANALOG_IN
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// this needs to be called before setup() or some functions won't
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// work there

‎sduino/hardware/sduino/stm8/cores/sduino/wiring_analog.c‎

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@@ -27,6 +27,8 @@
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#include "wiring_private.h"
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#include "pins_arduino.h"
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#ifndef NO_ANALOG_IN
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/*
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uint8_t analog_reference = DEFAULT;
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@@ -87,8 +89,10 @@ int analogRead(uint8_t pin)
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// combine the two bytes
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return (high << 8) | low;
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}
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#endif //ifndef NO_ANALOG_IN
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#ifndef NO_ANALOG_OUT
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// Right now, PWM output only works on the pins with
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// hardware support. These are defined in the appropriate
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// pins_*.c file. For the rest of the pins, we default
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}
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}
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}
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#endif // ifndef NO_ANALOG_OUT

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