Posted on July 10, 2014 at 09:11Hi
I have stm32f4 discovery board, first I could program the board but now It does not work. all jumpers are fine and I'm trying to run a sample program such as LED toggle. I checked the GPIO configuration and I just configure PA.4 for toggling. and this is my simple code:
GPIO_InitTypeDef GPIO_InitStructure;
int main(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
while (1)
{
GPIOA->BSRRL =GPIO_Pin_4;
GPIOA->BSRRH =GPIO_Pin_4;
}
}
then I tried to reset the board with pulling BOOT0 high. for this purpose,I connected BOOT0 pin to 3v pin. but It does not work yet. I'm working with Keil uvision 4 and It seems that keil can not recognize the ST Link,there is an error in options for target->Debug->ST Link Debugger ->setting : no ST Link detected.
what should I do? please help me
thanks
