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/*
* CNC-remote-control
* UART driver
*
* Copyright (C) 2011 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "uart.h"
#include "main.h"
#include "util.h"
#include <avr/io.h>
static bool uart_enabled;
void uart_putchar(char c)
{
if (!uart_enabled)
return;
mb();
if (c == '\n')
uart_putchar('\r');
while (!(UCSRA & (1 << UDRE)));
UDR = (uint8_t)c;
}
void uart_puthex(uint8_t val)
{
uart_putchar(hexdigit_to_ascii((val >> 4) & 0xF));
uart_putchar(hexdigit_to_ascii(val & 0xF));
}
void _uart_putstr(const char PROGPTR *pstr)
{
char c;
while (1) {
c = (char)pgm_read_byte(pstr);
if (c == '\0')
break;
uart_putchar(c);
pstr++;
}
}
#if UART_USE_2X
# define UBRR_FACTOR 2
#else
# define UBRR_FACTOR 1
#endif
void uart_init(void)
{
/* Set baud rate */
UBRRL = lo8((F_CPU / 16 / UART_BAUD) * UBRR_FACTOR);
UBRRH = hi8((F_CPU / 16 / UART_BAUD) * UBRR_FACTOR) & ~(1 << URSEL);
#if UART_USE_2X
UCSRA = (1 << U2X);
#endif
/* 8 Data bits, 1 Stop bit, No parity */
UCSRC = (1 << UCSZ0) | (1 << UCSZ1) | (1 << URSEL);
/* Enable transmitter */
UCSRB = (0 << RXEN) | (1 << TXEN) | (0 << RXCIE);
mb();
uart_enabled = 1;
}
void uart_exit(void)
{
uart_enabled = 0;
mb();
while (!(UCSRA & (1 << UDRE)));
_delay_ms(10);
UCSRB = 0;
UCSRC = 0;
UCSRA = 0;
UBRRL = 0;
UBRRH = 0;
}
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