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stm32-i2cdetect
Finds every I2C device on the bus.
Table of Contents
Introduction
Sometimes when I buy a device that supports I2C, I am confused about the device's address. Many times the manual doesn't show clearly what kind of address is it? 7-bit? 8-bit? Should I shift it left? Right? Or it is good the way it is? This is especially true for (the not so well documented) devices I buy from ebay/aliexpress.
This code scans through the bus and lists every device on it. This software was inspired (as its name shows) by i2cdetect . [1]
Demonstration of the output:
Searching for I2C devices on the bus...
Device found: 0x38
Device found: 0xB0
Device found: 0xD0
Total found devices: 3
How it works
It scans the bus from 0x03 to 0x77 for devices. According to the I2C manual, addresses out of this range are invalid. [2] If there is a device, then it prints out its 7-bit address to the Single Wire Output (SWO) interface.
The code is inside Src/i2c_detect.c and Inc/i2c_detect.h. The software is simple, no tricks, nothing. Just a little help to make everyday life easier.
Porting
I made this with Atollic TrueStudio for STM32 Nucleo-64 board and I generated every driver with CubeMX. I included the *.ioc file, so it can be reused with any STM32 controller.
References
[1] Linux - i2cdetect
[2] I2C - addressing