A custom C API for instrumenting Jetson TX1’s SoM and SoC with the use of userspace I2C and sysfs files. This is small C library for accessing two Jetson TX1’s INA3221 – current and voltage monitors as well as on-module temperature sensors and other information such as GPU, CPUs and EMC operating frequencies – either through sysf nodes or userspace I2C. The current version has been tested on the Jetson TX1 module with a SKU 699-82180-1000-100 obtained with i2cdump -y -r 0x14-0x26 2 0x50 b command.

In order to build and install the library and sample programs use the following commands.

mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

Running the jtx1inst_demo program on the same module, results in the following output.

[POWER] module power input: 3898.000mW
[POWER] GPU power rail: 152.000mW
[POWER] CPU power rail: 1757.000mW
[POWER] main carrier board power input: 1632.000mW
[POWER] main carrier board 5V supply: 2025.000mW
[POWER] main carrier board 3.3V supply: 1632.000mW
[POWER] carrier board 3.3V Sleep supply: 0.000mW
[POWER] main carrier board 1.8V supply: 0.000mW
[POWER] 3.3V supply for M.2 Key E connector: 0.000mW

[CURRENT] module power input: 3860.000mA
[CURRENT] GPU power rail: 152.000mA
[CURRENT] CPU power rail: 840.000mA
[CURRENT] main carrier board power input: 328.000mA
[CURRENT] main carrier board 5V supply: 106.000mA
[CURRENT] main carrier board 3.3V supply: 328.000mA
[CURRENT] carrier board 3.3V Sleep supply: 0.000mA
[CURRENT] main carrier board 1.8V supply: 0.000mA
[CURRENT] 3.3V supply for M.2 Key E connector: 0.000mA

[VOLTAGE] module power input: 3438.000mV
[VOLTAGE] GPU power rail: 76.000mV
[VOLTAGE] CPU power rail: 840.000mV
[VOLTAGE] main carrier board power input: 4976.000mV
[VOLTAGE] main carrier board 5V supply: 19112.000mV
[VOLTAGE] main carrier board 3.3V supply: 4976.000mV
[VOLTAGE] carrier board 3.3V Sleep supply: 3336.000mV
[VOLTAGE] main carrier board 1.8V supply: 1832.000mV
[VOLTAGE] 3.3V supply for M.2 Key E connector: 3336.000mV

[TEMPERATURE] A0: 34000mC
[TEMPERATURE] CPU: 29000mC
[TEMPERATURE] GPU: 29000mC
[TEMPERATURE] PLL: 29000mC
[TEMPERATURE] PMIC: 100000mC
[TEMPERATURE] TDIODE: 33750mC
[TEMPERATURE] TBOARD: 33000mC
[TEMPERATURE] FAN: 31250mC

[FREQ] EMC: 1600000000Hz
[FREQ] GPU: 76800000Hz
[FREQ] CPU0: 1734000Hz
[FREQ] CPU1: 1734000Hz
[FREQ] CPU2: 1734000Hz
[FREQ] CPU3: 1734000Hz

In order to generate documentation from sources annotated with Doxygen use the following command in doc directory.

doxygen config

This is free and unencumbered software released into the public domain. For more information, please refer to the LICENSE file.