reflow-oven-control-sw/stm-firmware/UART/uart.c

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2020-01-26 15:27:06 +01:00
/*
* uart.c
*
* Created on: Dec 15, 2014
* Author: shino-chan
*/
//USART2
//PA2 => TX
//PA3 => RX
//Alternate Function 7
#include "uart.h"
#include <stm32f4xx.h>
void initUART() {
__DSB();
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
__DSB();
GPIOA->MODER |= (1<<5);
GPIOA->AFR[0] |= (7<<8); //Enable Clock
GPIOA->MODER |= (1<<5);
GPIOA->AFR[0] |= (7<<8);
asm("nop");
asm("nop");
asm("nop");
USART2->BRR = 0x1117; //Baudrate 273.4375=>0x1117 9600baud bei 42MHz Periph
USART2->CR1 = USART_CR1_UE | USART_CR1_TE;
}
void sendChar(char c) {
while(!(USART2->SR & USART_SR_TXE));
USART2->DR = c;
}
void sendString(char* s, int count) {
int i = 0;
for (i = 0; i < count; i++,s++)
{
if (!(*s))
break;
sendChar(*s);
}
}