nes-proj/platform/msb430/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.
*
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* @(#)$Id: rs232.c,v 1.9 2009/06/29 12:46:50 nvt-se Exp $
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*/
/** \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 <io.h>
#include <signal.h>
#include <string.h>
#include "dev/msb430-uart1.h"
#include "rs232.h"
#ifndef U1IFG
#define U1IFG IFG2
#endif
/*---------------------------------------------------------------------------*/
/**
* Initalize the RS232 port.
*
*/
void
rs232_init(void)
{
rs232_set_speed(RS232_115200);
}
/*---------------------------------------------------------------------------*/
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int
putchar(int c)
{
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if(uart_get_mode() == UART_MODE_RS232) {
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/* Loop until the transmission buffer is available. */
UART_WAIT_TX();
/* Transmit the data. */
UART_TX = c;
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return c;
} else {
return -1;
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}
}
/*---------------------------------------------------------------------------*/
void
rs232_send(char c)
{
/* Check if the UART is in RS232 mode before sending.
This check can be ommitted if every access to rs232 locks the uart
before using it.
*/
putchar(c);
}
/*---------------------------------------------------------------------------*/
void
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rs232_set_speed(enum rs232_speed speed)
{
// baud
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const unsigned char br_table[5][3] = {
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{0x00, 0x01, 0x00}, // 9600
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{0x80, 0x00, 0x00}, // 19200
{0x40, 0x00, 0x00}, // 38400
{0x2a, 0x00, 0x5b}, // 57600
{0x15, 0x00, 0x4a} // 115200
};
uart_set_speed(UART_MODE_RS232, br_table[speed][0],
br_table[speed][1], br_table[speed][2]);
}
/*---------------------------------------------------------------------------*/
void
rs232_print(char *cptr)
{
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/* lock UART for the print operation */
if(uart_lock(UART_MODE_RS232)) {
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while(*cptr != 0) {
rs232_send(*cptr);
++cptr;
}
uart_unlock(UART_MODE_RS232);
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}
}
/*---------------------------------------------------------------------------*/
void
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rs232_set_input(uart_handler_t f)
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{
uart_set_handler(UART_MODE_RS232, f);
}
/** @} */