contiki/platform/cc2420dbk/dev/cb_uart01.c

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/*
* 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.
*
* @(#)$Id: cb_uart01.c,v 1.1 2007/02/02 14:09:06 bg- Exp $
*/
#include <stdio.h>
#include <avr/interrupt.h>
#include "contiki.h"
#include "dev/slip.h"
static int
uart0_putchar(char c, FILE *stream)
{
while (!(UCSR0A & BV(UDRE0)))
;
UDR0 = c;
return c;
}
static FILE uart0_stdout =
FDEV_SETUP_STREAM(uart0_putchar, NULL, _FDEV_SETUP_WRITE);
void
slip_arch_init(unsigned long ubr)
{
u8_t dummy;
spl_t s = splhigh();
UBRR1L = ubr;
UBRR1H = ubr >> 8;
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. */
/* And now UART0. */
UBRR0L = BAUD2UBR(38400);
UBRR0H = BAUD2UBR(38400) >> 8;
UCSR0C = BV(UCSZ1) | BV(UCSZ0); /* 1 start bit, no parity, 1 stop bit */
UCSR0B = BV(TXEN); /* TX ONLY!!! */
splx(s);
stdout = &uart0_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);
}