STM32F411 based custom PCB I2C debugging

,
2

This is not overriding the right pin macros at all. There are zero results when looking for a code reference to it.

Since you are using board = genericSTM32F411CE we have the used Arduino variant as

and that variant_generic.h file has

Which is in turn used to create

which is in turn what the Wire (I2C) library uses to construct its Wire object on by default

So your platformio.ini should be

[env:genericSTM32F411CE] 
platform = ststm32 
board = genericSTM32F411CE
framework = arduino 
upload_protocol = dfu 
build_flags = 
    -D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC 
    -D USBCON 
    -D HSE_VALUE=8000000 
    -D PIN_WIRE_SDA=PB7 
    -D PIN_WIRE_SCL=PB6

Equally, you can construct a different or more Wire object or redefine pins on the fly, as is documented in

1 Like