79 lines
1.3 KiB
C
79 lines
1.3 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include <stdio.h>
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#include "uart.h"
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#include "fifo.h"
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volatile struct {
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uint8_t tmr_int:1;
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uint8_t adc_int:1;
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uint8_t rx_int:1;
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} intflags;
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/*
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* * Last character read from the UART.
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*
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*/
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volatile char rxbuff;
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FILE uart_stdout = FDEV_SETUP_STREAM(uart_stream, NULL, _FDEV_SETUP_WRITE);
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void uart_init(void)
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{
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UCSR0A = _BV(U2X0); /* improves baud rate error @ F_CPU = 1 MHz */
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UCSR0B = _BV(TXEN0) | _BV(RXEN0) | _BV(RXCIE0); /* tx/rx enable, rx complete
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* intr */
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UBRR0L = (F_CPU / (8 * 115200UL)) - 1;
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}
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ISR(USART0_RX_vect)
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{
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uint8_t c;
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c = UDR0;
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if (bit_is_clear(UCSR0A, FE0)) {
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rxbuff = c;
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intflags.rx_int = 1;
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}
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}
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void uart_putc(uint8_t c)
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{
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loop_until_bit_is_set(UCSR0A, UDRE0);
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UDR0 = c;
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}
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void uart_puts(const char *s)
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{
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do {
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uart_putc(*s);
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}
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while (*s++);
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}
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void uart_puts_P(PGM_P s)
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{
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while (1) {
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unsigned char c = pgm_read_byte(s);
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s++;
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if ('\0' == c)
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break;
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uart_putc(c);
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}
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}
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static int uart_stream(char c, FILE * stream)
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{
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if (c == '\n')
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uart_putc('\r');
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loop_until_bit_is_set(UCSR0A, UDRE0);
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UDR0 = c;
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return 0;
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}
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