1. Don't believe too much in the pull-down and pull-down of the IO inside the STM32. If necessary, connect a pull-down resistor externally.
2. When using the JTAG IO port as a common IO port, JTAG must be disabled first.
That is: to use PB3, PB4, PA13, PA14, PA15, JTAG must be prohibited first.
In the library function, call the following function:
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);//Close jtag, keep swd
In register programming, use:
//JTAG mode setting, used to set the mode of JTAG
//mode:jtag, swd mode setting; 00, all enable; 01, enable SWD; 10, all off;
//#define JTAG_SWD_DISABLE 0X02
//#define SWD_ENABLE 0X01
//#define JTAG_SWD_ENABLE 0X00
void JTAG_Set (u8 mode)
{
u32 temp;
temp=mode;
temp<<=25;
RCC-"APB2ENR"=1""0; //Open the auxiliary clock
AFIO->MAPR&=0XF8FFFFFF; //Clear MAPR[26:24]
AFIO->MAPR|=temp; //Set JTAG mode
}
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