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83 lines
1.2 KiB
83 lines
1.2 KiB
#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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// Clear U2X0
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cbi(UCSR0A, U2X0);
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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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/** Set Double Speed Asynchronous mode */
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void usart_set_2x(bool set)
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{
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set_bit(UCSR0A, U2X0, set);
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}
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/** Send byte over USART */
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void usart_tx(uint8_t data)
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{
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// Wait for transmit buffer
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while (!usart_tx_ready());
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// send it
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UDR0 = data;
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}
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/** Receive one byte over USART */
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uint8_t usart_rx(void)
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{
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// Wait for data to be received
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while (!usart_rx_ready());
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// Get and return received data from buffer
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return UDR0;
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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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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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usart_tx(c);
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}
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}
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/** Clear receive buffer */
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void usart_flush_rx(void)
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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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dummy = UDR0;
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}
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}
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