I am having the same problem as this: [image] Uart Transmit works in STM32CubeIDE but not in PlatformIO (I use the same code) Development Platforms With the function HAL_UART_Transmit I send a string to the console. The problem is that the whole thing works in STMCubeID …

Stm32cube framework, Not getting uart output on VCP on a Mac

mleo June 13, 2024, 7:05am 2

OK,
Changing the toolchain/IDE environment in STMCubeMX from EWARM ( the default ) to STMCubeIDE fixed the problem.