150 lines
4.8 KiB
C
150 lines
4.8 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: rs232.c,v 1.1 2006/06/18 07:49:33 adamdunkels Exp $
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*/
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/** \addtogroup esbrs232
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* @{ */
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/**
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* \file
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* RS232 communication device driver for the MSP430.
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* \author Adam Dunkels <adam@sics.se>
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*
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* This file contains an RS232 device driver for the MSP430 microcontroller.
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*
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*/
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#include <io.h>
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#include <signal.h>
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#include <string.h>
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#include "contiki-esb.h"
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static int (* input_handler)(unsigned char) = NULL;
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/*---------------------------------------------------------------------------*/
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interrupt(UART1RX_VECTOR)
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rs232_rx_usart1(void)
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{
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/* Check status register for receive errors. - before reading RXBUF since
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it clears the error and interrupt flags */
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if(!(URCTL1 & RXERR) && input_handler != NULL) {
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if(input_handler(RXBUF1)) {
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LPM_AWAKE();
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}
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} else {
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/* Else read out the char to clear the I-flags, etc. */
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RXBUF1;
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Initalize the RS232 port.
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*
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*/
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void
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rs232_init(void)
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{
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/* RS232 */
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UCTL1 = CHAR; /* 8-bit character */
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UTCTL1 = SSEL1; /* UCLK = MCLK */
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rs232_set_speed(RS232_57600);
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input_handler = NULL;
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ME2 |= (UTXE1 | URXE1); /* Enable USART1 TXD/RXD */
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IE2 |= URXIE1; /* Enable USART1 RX interrupt */
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}
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/*---------------------------------------------------------------------------*/
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void
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rs232_send(char c)
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{
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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. */
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TXBUF1 = c;
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}
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/*---------------------------------------------------------------------------*/
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void
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rs232_set_speed(unsigned char speed)
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{
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if(speed == RS232_19200) {
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/* Set RS232 to 19200 */
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UBR01 = 0x80; /* 2,457MHz/19200 = 128 -> 0x80 */
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UBR11 = 0x00; /* */
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UMCTL1 = 0x00; /* no modulation */
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} else if(speed == RS232_38400) {
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/* Set RS232 to 38400 */
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UBR01 = 0x40; /* 2,457MHz/38400 = 64 -> 0x40 */
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UBR11 = 0x00; /* */
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UMCTL1 = 0x00; /* no modulation */
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} else if(speed == RS232_57600) {
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UBR01 = 0x2a; /* 2,457MHz/57600 = 42.7 -> 0x2A */
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UBR11 = 0x00; /* */
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UMCTL1 = 0x5b; /* */
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} else if(speed == RS232_115200) {
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UBR01 = 0x15; /* 2,457MHz/115200 = 21.4 -> 0x15 */
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UBR11 = 0x00; /* */
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UMCTL1 = 0x4a; /* */
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} else {
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rs232_set_speed(RS232_57600);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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rs232_print(char *cptr)
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{
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while(*cptr != 0) {
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rs232_send(*cptr);
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++cptr;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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rs232_set_input(int (*f)(unsigned char))
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{
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input_handler = f;
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}
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/*---------------------------------------------------------------------------*/
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void
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slip_arch_writeb(unsigned char c)
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{
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rs232_send(c);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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