I'm trying to upload code to an STM32F103RET6 MCU and have a simple setup by now (see image below). I have attached a LED to pin PA1 as a GPIO OUTPUT and an external oscillator at 16 MHz. The other three pins are connected to the JTAG connector that ...

I have a board with a STM32F103RET6 with many things, and a blue and green LED's connected to GPIO pins. To test if it works correctly I'm using STM32 cube IDE to upload a program that blinks the LED's, and the LED turns on but it does not turn off a...