nes-proj/cpu/msp430/slip_uart1.c

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/*
* Copyright (c) 2006, 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: slip_uart1.c,v 1.2 2006/08/17 15:41:13 bg- Exp $
*/
/*
* Machine dependent MSP430 SLIP routines for UART1.
*/
#include <io.h>
#include <signal.h>
#include "contiki.h"
#include "dev/slip.h"
void
slip_arch_writeb(unsigned char c)
{
/* Loop until the transmission buffer is available. */
while ((IFG2 & UTXIFG1) == 0);
/* Transmit the data. */
TXBUF1 = c;
}
/*
* The serial line is used to transfer IP packets using slip. To make
* it possible to send debug output over the same line we send debug
* output as slip frames (i.e delimeted by SLIP_END).
*
*/
int
putchar(int c)
{
#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((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;
}
#define RS232_19200 1
#define RS232_38400 2
#define RS232_57600 3
#define RS232_115200 3
#if 0
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);
}
}
#endif
/**
* Initalize the RS232 port and the SLIP driver.
*
*/
void
slip_arch_init(void)
{
/* RS232 */
P3DIR &= ~0x80; /* Select P37 for input (UART1RX) */
P3DIR |= 0x40; /* Select P36 for output (UART1TX) */
P3SEL |= 0xC0; /* Select P36,P37 for UART1{TX,RX} */
UCTL1 = SWRST | CHAR; /* 8-bit character, UART mode */
/* U1RCTL &= ~URXEIE; /\* even erroneous characters trigger interrupts *\/ */
UTCTL1 = SSEL1; /* UCLK = MCLK */
/* rs232_set_speed(RS232_57600); */
UBR01 = 0x2a;
UBR11 = 0x00;
UMCTL1 = 0x5b;
ME2 &= ~USPIE1; /* USART1 SPI module disable */
ME2 |= (UTXE1 | URXE1); /* Enable USART1 TXD/RXD */
UCTL1 &= ~SWRST;
/* XXX Clear pending interrupts before enable!!! */
IE2 |= URXIE1; /* Enable USART1 RX interrupt */
}
interrupt(UART1RX_VECTOR)
__uart1_intr()
{
/* Check status register for receive errors. */
if (URCTL1 & RXERR) {
volatile unsigned dummy;
dummy = RXBUF1; /* Clear error flags by forcing a dummy read. */
} else {
if(slip_input_byte(RXBUF1))
LPM4_EXIT;
}
}