STM32F103 PB3 PB4 usage-EEWORLD

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Today, I debugged PB3, which is a common IO. After debugging for a long time, I thought it was a PCB problem. I couldn't find the problem after searching for a long time. Sometimes people are numb and their thinking is limited. I habitually thought that I could use it after configuring the IO. I didn't notice that PB3 is a JTAG shared IO, which is in JTAG state by default. I need to disable JTAG before I can use it.

DelayMS(2000); //It is recommended to delay, otherwise it will cause the jtag and sw to be unable to connect to the CPU, which is troublesome to handle.
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //This sentence must be executed
//GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable,ENABLE); //Select GPIO_Remap_SWJ_Disable or GPIO_Remap_SWJ_JTAGDisable as needed
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure .GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructur

PB4 is the same

Keywords：STM32F103 Reference address：STM32F103 PB3 PB4 usage

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