106 lines
1.8 KiB
C
106 lines
1.8 KiB
C
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/*
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* UART.c
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*
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* Created: 18/11/2021 17:13:25
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* Author: n0x
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <string.h>
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#include "UART.h"
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volatile int enabled = 1;
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/* Schreiben Sie eine Funktion, welche die UART Schnittstelle f<>r das Senden von
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Daten mit
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9600Baud,
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8 Bit,
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keine Parit<EFBFBD>t und
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1 Stopbit
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initialisiert. */
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void
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uart_init(void)
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{
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/* set BAUD rate to 9600 */
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UBRR0 = 103;
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/* Async UART */
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UCSR0C |= (0<<UMSEL00)|(0<<UMSEL01);
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/* Disable Parity */
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UCSR0C |= (0<<UPM00)|(0<<UPM01);
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/* 8 Bit */
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UCSR0C |= (1<<UCSZ00)|(1<<UCSZ01);
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/* 1 Stopbit */
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UCSR0C |= (0<<USBS0);
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/* enable send */
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UCSR0B = (1<<TXEN0);
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}
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/* Schreiben Sie eine Funktion, welche einen String <20>bergeben bekommt, und diesen
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auf der UART Schnittstelle ausgibt. */
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void
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uart_send (char* string){
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int len = strlen(string);
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for(int i = 0; i < len; i++){
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while (!( UCSR0A & (1<<UDRE0)) );
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UDR0 = string[i];
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}
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}
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/* Schreiben Sie eine Funktion, welche die UART Schnittstelle f<>r das Senden von Daten mit
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9600Baud,
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8 Bit,
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keine Parit<EFBFBD>t und
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1 Stoppbit
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initialisiert. Nutzen Sie dabei ein Uart-Interrupt. */
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void
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uart_init_isr(void)
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{
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/* set BAUD rate to 9600 */
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UBRR0 = 103;
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/* Async UART */
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UCSR0C |= (0<<UMSEL00)|(0<<UMSEL01);
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/* Disable Parity */
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UCSR0C |= (0<<UPM00)|(0<<UPM01);
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/* 8 Bit */
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UCSR0C |= (1<<UCSZ00)|(1<<UCSZ01);
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/* 1 Stopbit */
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UCSR0C |= (0<<USBS0);
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/* enable send */
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UCSR0B |= (1<<TXEN0);
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/* enable interrupt */
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UCSR0B |= (1<<UDRIE0);
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}
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/* Schreiben Sie eine Funktion, welche einen String <20>bergeben bekommt, und diesen
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auf der UART Schnittstelle ausgibt. (Interrupts) */
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void
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uart_send_isr(char* string)
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{
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int i = 0;
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while( i < strlen(string)){
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if(enabled){
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UDR0 = string[i];
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i++;
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enabled = 0;
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}
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}
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}
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ISR(USART0_UDRE_vect){
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enabled = 1;
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}
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