About the use of PA15 pin as normal IO in STM32-EEWORLD

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I was working on a project recently, and when debugging, I found that the PA15 pin could only output a high level of 3.3V regardless of whether it was configured as output high, low, or input.

Premise: Currently, there are two methods for STM hardware debugging, JTAG and SW. At present, I personally think that the best method is SW, because it only occupies two IO ports, PA13 and PA14. JTAG occupies three more IO ports, PB3, PB4, and PA15, which is a waste of resources.

I use SW, but STM will enable both SW and JTAG by default. That is to say, by default, PA13, PA14, PB3, PB4, and PA15 cannot be used as ordinary IO.
Because I don't use JTAG, in order to make PB3, PB4, and PA15 ordinary IO, the following configuration must be performed:

*RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE)*;//Enable port multiplexing clock
*GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);*//Disable JTAG

These two sentences are ok, and the above three pins can be used as normal IO in the future.

Reference address：About the use of PA15 pin as normal IO in STM32

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