STM32 turns off JTAG and uses the corresponding GPIO port to record simply-EEWORLD

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STM32's PA13-PA14-PA15-PB3-PB4-PB5 are mainly used for JTAG debugging, so by default they are in JTAG mode after startup. However, when JTAG is not needed and the GPIO port needs to be fully utilized, JTAG needs to be turned off and set to GPIO mode.

GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //Turn on the PA clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //Turn on the PB clock

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //Turn on multiplexed clock----important

GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable,ENABLE); //Disable all SWJ----important

GPIO_InitStructure.GPIO_Pin =GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin =GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

Then you can use it directly as a GPIO port --- high and low level settings ---

GPIO_SetBits(GPIOA,GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
GPIO_ResetBits(GPIOB,GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5);

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