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57 lines
785 B
57 lines
785 B
9 years ago
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "calc.h"
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#include "usart.h"
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void usart_init(uint16_t ubrr)
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{
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/*Set baud rate */
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UBRR0H = (uint8_t)(ubrr >> 8);
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UBRR0L = (uint8_t) ubrr;
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// Enable Rx and Tx
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UCSR0B = (1 << RXEN0) | (1 << TXEN0);
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// 8-bit data, 1 stop bit
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UCSR0C = (0b11 << UCSZ00);
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}
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/** Send string over USART */
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void usart_puts(const char* str)
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{
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while (*str)
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{
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usart_tx(*str++);
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}
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}
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/** Send progmem string over USART */
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void usart_puts_P(const char* str)
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{
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char c;
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while ((c = pgm_read_byte(str++)))
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{
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usart_tx(c);
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}
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}
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/** Clear receive buffer */
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void usart_clear_rx()
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{
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uint8_t dummy;
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while (bit_is_high(UCSR0A, RXC0))
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{
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dummy = UDR0;
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}
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}
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