EEM-465 Gömülü Sistemler

2022-2023 Güz Dönemi Ders 6

Kesme (interrupt)

Kesme ile yanan ledi değiştirme, gecikmeli

#include "stm32f4xx.h"                  
volatile static  int led=12;

void bekle(volatile int x);
void bekle(volatile int x){
  volatile int i;
  for(i=0;i<1000000*x;i++);
}
void EXTI0_IRQHandler(void);
void EXTI0_IRQHandler(void){
  EXTI->PR |= EXTI_PR_PR0;
  led++;
  if(led==16)
    led=12;
}
int main(){  
  RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN |
                  RCC_AHB1ENR_GPIOAEN;
  RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
  GPIOD->MODER |= GPIO_MODER_MODER12_0 |
                  GPIO_MODER_MODER13_0 |
                  GPIO_MODER_MODER14_0 |
                  GPIO_MODER_MODER15_0;
  
  NVIC_EnableIRQ(EXTI0_IRQn);
  SYSCFG->EXTICR[0] &=  ~SYSCFG_EXTICR1_EXTI0;
  
  EXTI->RTSR |= EXTI_RTSR_TR0;
  EXTI->IMR |= EXTI_IMR_IM0;
  while(1){
    GPIOD->ODR |= 1<<led;
    bekle(3);
    GPIOD->ODR &= ~(0xFU<<12);
    bekle(3);
  }
}

Kesme ile yanan ledi değiştirme, gecikmesiz

#include "stm32f4xx.h"
volatile static int pin=12;
volatile static int i, son_deger=3000000;

void EXTI0_IRQHandler(void);
void EXTI0_IRQHandler(void){
  EXTI->PR |= EXTI_PR_PR0;
  pin++;
  son_deger=0;
  if(pin==16)
    pin=12;
}
int main(){
  
  RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIODEN;
  RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
  GPIOD->MODER |= GPIO_MODER_MODER12_0 |
                  GPIO_MODER_MODER13_0 |
                  GPIO_MODER_MODER14_0 |
                  GPIO_MODER_MODER15_0;
  SYSCFG->EXTICR[0]&= ~SYSCFG_EXTICR1_EXTI0;
  
  NVIC_EnableIRQ(EXTI0_IRQn);
  EXTI->IMR |= EXTI_IMR_IM0;
  EXTI->RTSR |= EXTI_RTSR_TR0;
  
  while(1){  
    GPIOD->ODR |= 1<<pin;
    for(i=0;i<son_deger;i++);
  
    GPIOD->ODR &= ~(0xFU<<12);
    for(i=0;i<son_deger;i++);
    son_deger=3000000;
  } 
}