I am using an STM32F103Z MCU. I cannot get Port B Pin 4 to work as a normal GPIO output pin. I do the setup just like other GPIO pins that are working, but Port B Pin 4 just goes high and stays high, GPIO_ResetBits() does not work.

[Chris1 · Accepted solution]

    // Disable the JTAG portion of the Serial Wire JTAG Debug Port SWJ-DP
    GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);

[JFreu.1]

Thank you, This works great. Much appreciated Chris