Arduino for STM32

So you used dfu? And you shorten the boot0 pin? Then press reset?
The STM32CubeProgrammer is well installed?
The bord is recognized as stm32bootloader ?

This board is supported since 2.7.0:
https://github.com/stm32duino/Arduino_C ... /pull/2108

Simply update to the latest core.

Why?

I've tested with a disco F407, LSE is not fitted so PC14 and PC15 are free.
Using default blink sketch using those pins and it works.
Maybe pio do some extra config preventing to use them...
Test with Arduino IDE.

Which board you select to build?
Code?

My guess is it support libmaple core and not the stm32 core. https://github.com/DCS-Skunkworks/dcs-b ... d-Hardware

So a port should be done to support the stm32 core.

It will be called automatically as it replace the weak function.

Simply redefine the system core clock config:
https://github.com/stm32duino/Arduino_C ... ock_config

@stevestrong This menu is part of the libmaple core: https://github.com/rogerclarkmelbourne/Arduino_STM32/blob/master/STM32F1/boards.txt#L446 That is true, just that STM32F1XX/GD32F1XX Boards by stm32duino. is not known. Guess it is linked to dandrown package json file. @fpiSTM could you eventually...

@stevestrong
This menu is part of the libmaple core:
https://github.com/rogerclarkmelbourne/ ... s.txt#L446