Arduino for STM32

Thank you fpiSTM . It working for you helped me figure out my issue. When I was switching between versions of generic_clock.c, I had forgotten to touch the file for it to picked up. So the reason it worked when I removed the RCC_PERIPHCLK_I2C4 was that the file was updated and got re-compiled. Such ...

So I made a board a while ago and it always worked using the Stm32CubeIDE, but never in Arduino. I picked it up again this week and downloaded the latest STM32 MCU Based Boards v2.1.0 package and it was working except the for the serial output was garbaged. I'm using PD0/PD1, so I tried PC10/PC11 ...