nes-proj/cpu/avr/slip_uart1.c

103 lines
2.8 KiB
C

/*
* Copyright (c) 2007, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* Machine dependent AVR SLIP routines for UART1.
*/
#include <stdio.h>
#include <avr/interrupt.h>
#include "contiki.h"
#include "dev/slip.h"
static int
slip_putchar(char c, FILE *stream)
{
#define SLIP_END 0300
static char debug_frame = 0;
if (!debug_frame) { /* Start of debug output */
slip_arch_writeb(SLIP_END);
slip_arch_writeb('\r'); /* Type debug line == '\r' */
debug_frame = 1;
}
slip_arch_writeb((unsigned char)c);
/*
* Line buffered output, a newline marks the end of debug output and
* implicitly flushes debug output.
*/
if (c == '\n') {
slip_arch_writeb(SLIP_END);
debug_frame = 0;
}
return c;
}
static FILE slip_stdout =
FDEV_SETUP_STREAM(slip_putchar, NULL, _FDEV_SETUP_WRITE);
void
slip_arch_init(unsigned long ubr)
{
uint8_t dummy;
spl_t s = splhigh();
UBRR1L = ubr;
UBRR1H = ubr >> 8; /* Always zero */
UCSR1C = BV(UCSZ1) | BV(UCSZ0); /* 1 start bit, no parity, 1 stop bit */
UCSR1B = BV(RXEN) | BV(TXEN) | BV(RXCIE);
dummy = UDR1; /* Flush RX buffer. */
splx(s);
stdout = &slip_stdout;
}
void
slip_arch_writeb(unsigned char c)
{
while (!(UCSR1A & BV(UDRE1)))
;
UDR1 = c;
}
ISR(SIG_UART1_RECV)
{
/* Should deal with receive errors. */
slip_input_byte(UDR1);
}