EEM-465 Gömülü Sistemler

2022-2023 Güz Dönemi Ders 8

Temel Zamanlayıcılar

Meşgul bekleme yöntemi

#include "stm32f4xx.h"
int main(){
  RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
  GPIOD->MODER |= GPIO_MODER_MODER13_0;
  
  RCC->APB1ENR |= RCC_APB1ENR_TIM6EN;
  TIM6->PSC = 15;
  TIM6->ARR = 1000;
  TIM6->CR1 |= TIM_CR1_CEN;
  
  while(1){
    GPIOD->ODR |= GPIO_ODR_OD13;
    while(!(TIM6->SR & TIM_SR_UIF));
    TIM6->SR &= ~TIM_SR_UIF;
    
    GPIOD->ODR &= ~GPIO_ODR_OD13;
    while(!(TIM6->SR & TIM_SR_UIF));
    TIM6->SR &= ~TIM_SR_UIF;
  }
}

Yoklama yöntemi

#include "stm32f4xx.h" 
int main(){
  RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN;
  GPIOB->MODER |= GPIO_MODER_MODER10_0;
  
  RCC->APB1ENR |= RCC_APB1ENR_TIM6EN;
  TIM6->PSC = 31;
  TIM6->ARR = 1000;
  TIM6->CR1 |= TIM_CR1_CEN;
  
  while(1){
    if(TIM6->SR & TIM_SR_UIF){
      TIM6->SR &= ~TIM_SR_UIF;
      if(GPIOB->ODR & GPIO_ODR_OD10)
        GPIOB->ODR &= ~GPIO_ODR_OD10;
      else
        GPIOB->ODR |= GPIO_ODR_OD10;  
    }
  }
}

Kesme Yöntemi

#include "stm32f4xx.h"   
void TIM6_DAC_IRQHandler(void);
void TIM6_DAC_IRQHandler(){
  TIM6->SR &= ~TIM_SR_UIF;
      
  if(GPIOB->ODR & GPIO_ODR_OD10)
    GPIOB->ODR &= ~GPIO_ODR_OD10;
  else
    GPIOB->ODR |= GPIO_ODR_OD10;  
}
int main(){
  RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN;
  GPIOB->MODER |= GPIO_MODER_MODER10_0;
  
  RCC->APB1ENR |= RCC_APB1ENR_TIM6EN;
  TIM6->PSC = 31;
  TIM6->ARR = 5000;
  TIM6->DIER |= TIM_DIER_UIE;
  NVIC_EnableIRQ(TIM6_DAC_IRQn);
  TIM6->CR1 |= TIM_CR1_CEN;  
  while(1){
  }
}