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