Posted on November 15, 2013 at 16:35I have a rather simple problem. Just trying to run the external interrupt on pin PA0 on stmf4-discovery without the library functions. It ran correctly on simulation trial using stm32f103 device. But I'm missing out something in implementing this on stmf4-disc hardware. Can someone point out the mistake? Here is the piece of my code:
&sharpinclude <stdio.h>
&sharpinclude <stm32f4xx.h>
&sharpinclude ''LED.h''
extern void LED_Init (void);
extern void LED_On (unsigned int num);
extern void LED_Off (unsigned int num);
void button_init()
{
RCC->AHB1ENR |= ((1UL << 0) ); /* Enable GPIOA clock */
GPIOA->MODER = 0x00000000;
GPIOA->PUPDR = 0x55555555;
}
void wait (void) {
int d;
for (d = 0; d < 200000; d++); /* only to delay for LED flashes */
}
int main()
{
SystemCoreClockUpdate(); /* Get Core Clock Frequency */
if (SysTick_Config(SystemCoreClock / 1000)) { /* SysTick 1 msec interrupts */
while (1);
}
LED_Init();
button_init(); //BUtton on PA0
EXTI->IMR |= (1UL<<0); // Enable not maskable interrupt on BIT1
EXTI->RTSR |= (1UL<<0); // Rising Edge
//SYSCFG->EXTICR[0] &= ~BIT1; // 0000 for interrupt for PA[0]
NVIC_EnableIRQ(6);
while(1)
{
}
}
void EXTI0_IRQHandler(void)
{
if(EXTI->PR & 1UL)
{
EXTI->PR |= 1; // Clear with Setting to BIT1
LED_On(3);
}
}
With Thanks,
Tapabrata
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