nes-proj/platform/esb/dev/rs232.c

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/*
* Copyright (c) 2005, 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.
*
* This file is part of the Contiki operating system.
*
*/
/** \addtogroup esbrs232
* @{ */
/**
* \file
* RS232 communication device driver for the MSP430.
* \author Adam Dunkels <adam@sics.se>
*
* This file contains an RS232 device driver for the MSP430 microcontroller.
*
*/
#include "contiki.h"
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#include <string.h>
#include "contiki-esb.h"
#include "isr_compat.h"
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static int (* input_handler)(unsigned char) = NULL;
/*---------------------------------------------------------------------------*/
ISR(UART1RX, rs232_rx_usart1)
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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/* Check status register for receive errors. - before reading RXBUF since
it clears the error and interrupt flags */
if(!(URCTL1 & RXERR) && input_handler != NULL) {
if(input_handler(RXBUF1)) {
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LPM4_EXIT;
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}
} else {
/* Else read out the char to clear the I-flags, etc. */
RXBUF1;
}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
/*---------------------------------------------------------------------------*/
/**
* Initalize the RS232 port.
*
*/
void
rs232_init(void)
{
/* RS232 */
UCTL1 = CHAR; /* 8-bit character */
UTCTL1 = SSEL1; /* UCLK = MCLK */
rs232_set_speed(RS232_57600);
input_handler = NULL;
ME2 |= (UTXE1 | URXE1); /* Enable USART1 TXD/RXD */
IE2 |= URXIE1; /* Enable USART1 RX interrupt */
}
/*---------------------------------------------------------------------------*/
void
rs232_send(char c)
{
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ENERGEST_ON(ENERGEST_TYPE_SERIAL);
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/* Loop until the transmission buffer is available. */
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while((IFG2 & UTXIFG1) == 0) {
}
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/* Transmit the data. */
TXBUF1 = c;
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ENERGEST_OFF(ENERGEST_TYPE_SERIAL);
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}
/*---------------------------------------------------------------------------*/
void
rs232_set_speed(unsigned char speed)
{
if(speed == RS232_19200) {
/* Set RS232 to 19200 */
UBR01 = 0x80; /* 2,457MHz/19200 = 128 -> 0x80 */
UBR11 = 0x00; /* */
UMCTL1 = 0x00; /* no modulation */
} else if(speed == RS232_38400) {
/* Set RS232 to 38400 */
UBR01 = 0x40; /* 2,457MHz/38400 = 64 -> 0x40 */
UBR11 = 0x00; /* */
UMCTL1 = 0x00; /* no modulation */
} else if(speed == RS232_57600) {
UBR01 = 0x2a; /* 2,457MHz/57600 = 42.7 -> 0x2A */
UBR11 = 0x00; /* */
UMCTL1 = 0x5b; /* */
} else if(speed == RS232_115200) {
UBR01 = 0x15; /* 2,457MHz/115200 = 21.4 -> 0x15 */
UBR11 = 0x00; /* */
UMCTL1 = 0x4a; /* */
} else {
rs232_set_speed(RS232_57600);
}
}
/*---------------------------------------------------------------------------*/
void
rs232_print(char *cptr)
{
while(*cptr != 0) {
rs232_send(*cptr);
++cptr;
}
}
/*---------------------------------------------------------------------------*/
void
rs232_set_input(int (*f)(unsigned char))
{
input_handler = f;
}
/*---------------------------------------------------------------------------*/
void
slip_arch_writeb(unsigned char c)
{
rs232_send(c);
}
/*---------------------------------------------------------------------------*/
/** @} */