Strange behavior on open-drain output mode for blue pill (STM32F103C8T6)
Guys, I need to put 5V on a pin. For this, I configured my pin as an open-drain output with a pull-up resistor (10k) between the pin and the 5V line. I checked the 5V-tolerant pins in the Blue Pill datasheet and tested many of them, but the conclusio...