I'm using Atollic True Studio and CubeMX to program a STM32F407 Discovery board and using 1 pin (shown in yellow) to trigger the scope. The signal that's supposed to be TX from the usart doesn't look right. I've tried it powering it with the USB cable and using a separate 5v power supply.
Can't see that I'm doing anything wrong.
Here's the code from usart.c