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/*
* Copyright © 2011 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
void
uart_send(char c)
{
loop_until_bit_is_set(UCSR1A, UDRE1);
UDR1 = c;
}
int
uart_put(char c, FILE *stream)
{
if (c == '\n')
uart_send('\r');
uart_send(c);
return 0;
}
int
uart_get(FILE *stream)
{
loop_until_bit_is_set(UCSR1A, RXC1);
return (int) UDR1 & 0xff;
}
void
uart_init(uint16_t baud)
{
PRR1 &= ~(1 << PRUSART1);
UBRR1L = baud;
UBRR1H = baud >> 8;
UCSR1A = 0;
UCSR1B = ((1 << RXEN1) | /* Enable receiver */
(1 << TXEN1)); /* Enable transmitter */
UCSR1C = ((0 << UMSEL10) | /* Asynchronous mode */
(0 << UPM10) | /* No parity */
(0 << USBS1) | /* 1 stop bit */
(3 << UCSZ10) | /* 8 bit characters */
(0 << UCPOL1)); /* MBZ for async mode */
}
static FILE mystdout = FDEV_SETUP_STREAM(uart_put, NULL, _FDEV_SETUP_WRITE);
static FILE mystdin = FDEV_SETUP_STREAM(NULL, uart_get, _FDEV_SETUP_READ);
void ao_debug_init(void)
{
uart_init(F_CPU / (16UL * 9600UL) - 1);
stdout = &mystdout;
stdin = &mystdin;
if (DDRB & AO_LED_RED) {
printf ("oops, starting all over\n");
for (;;)
;
}
DDRB |= (1 << 7);
PORTB |= (1 << 7);
printf ("debug initialized\n");
}
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