EEM-465 Gömülü Sistemler

2022-2023 Güz Dönemi Ders 11

Seri Haberleşme - UART

#include "stm32f4xx.h"
static volatile char a[]="abcdefghi\n\r";
static volatile int i=0,j;
int main(){
  RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
  GPIOA->MODER |= GPIO_MODER_MODER2_1;
  GPIOA->AFR[0] |= GPIO_AFRL_AFRL2_2 |
    GPIO_AFRL_AFRL2_1 | GPIO_AFRL_AFRL2_0;
  
  RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
  USART2->BRR = 0x683;
  USART2->CR1 |= USART_CR1_TE;
  USART2->CR1 |= USART_CR1_UE;
  while(1){
    USART2->DR=a[i++%11];
    while(!(USART2->SR & USART_SR_TXE));
    for(j=0;j<1000000;j++);
  }
}