154 lines
4.8 KiB
C
154 lines
4.8 KiB
C
/*
|
|
* Copyright (c) 2010, 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.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Machine dependent MSP430X UART1 code.
|
|
*/
|
|
#include "contiki.h"
|
|
#include <stdlib.h>
|
|
#include "sys/energest.h"
|
|
#include "dev/uart1.h"
|
|
#include "dev/watchdog.h"
|
|
#include "lib/ringbuf.h"
|
|
#include "isr_compat.h"
|
|
|
|
static int (*uart1_input_handler)(unsigned char c);
|
|
|
|
static volatile uint8_t transmitting;
|
|
|
|
#ifdef UART1_CONF_TX_WITH_INTERRUPT
|
|
#define TX_WITH_INTERRUPT UART1_CONF_TX_WITH_INTERRUPT
|
|
#else /* UART1_CONF_TX_WITH_INTERRUPT */
|
|
#define TX_WITH_INTERRUPT 1
|
|
#endif /* UART1_CONF_TX_WITH_INTERRUPT */
|
|
|
|
#if TX_WITH_INTERRUPT
|
|
#define TXBUFSIZE 64
|
|
|
|
static struct ringbuf txbuf;
|
|
static uint8_t txbuf_data[TXBUFSIZE];
|
|
#endif /* TX_WITH_INTERRUPT */
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
uint8_t
|
|
uart1_active(void)
|
|
{
|
|
return (UCA0STAT & UCBUSY) | transmitting;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
uart1_set_input(int (*input)(unsigned char c))
|
|
{
|
|
uart1_input_handler = input;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
uart1_writeb(unsigned char c)
|
|
{
|
|
/* watchdog_periodic(); */
|
|
#if TX_WITH_INTERRUPT
|
|
|
|
/* Put the outgoing byte on the transmission buffer. If the buffer
|
|
is full, we just keep on trying to put the byte into the buffer
|
|
until it is possible to put it there. */
|
|
while(ringbuf_put(&txbuf, c) == 0);
|
|
|
|
/* If there is no transmission going, we need to start it by putting
|
|
the first byte into the UART. */
|
|
if(transmitting == 0) {
|
|
transmitting = 1;
|
|
UCA0TXBUF = ringbuf_get(&txbuf);
|
|
}
|
|
|
|
#else /* TX_WITH_INTERRUPT */
|
|
|
|
/* Loop until the transmission buffer is available. */
|
|
while(!(IFG2 & UCA0TXIFG));
|
|
|
|
/* Transmit the data. */
|
|
UCA0TXBUF = c;
|
|
#endif /* TX_WITH_INTERRUPT */
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* Initalize the RS232 port.
|
|
*
|
|
*/
|
|
void
|
|
uart1_init(unsigned long ubr)
|
|
{
|
|
/* RS232 */
|
|
P3SEL |= 0x30; /* P3.4,5 = USCI_A0 TXD/RXD */
|
|
UCA0CTL1 |= UCSSEL_2; /* CLK = SMCLK */
|
|
UCA0BR0 = 0x45; /* 8MHz/115200 = 69 = 0x45 */
|
|
UCA0BR1 = 0x00;
|
|
UCA0MCTL = UCBRS2; /* Modulation UCBRSx = 4 */
|
|
UCA0CTL1 &= ~UCSWRST; /* Initialize USCI state machine */
|
|
|
|
transmitting = 0;
|
|
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
ISR(USCIAB1RX, uart1_rx_interrupt)
|
|
{
|
|
uint8_t c;
|
|
ENERGEST_ON(ENERGEST_TYPE_IRQ);
|
|
|
|
/* Check status register for receive errors. */
|
|
if(UCA0STAT & UCRXERR) {
|
|
c = UCA0RXBUF; /* Clear error flags by forcing a dummy read. */
|
|
} else {
|
|
c = UCA0RXBUF;
|
|
if(uart1_input_handler != NULL) {
|
|
if(uart1_input_handler(c)) {
|
|
LPM4_EXIT;
|
|
}
|
|
}
|
|
}
|
|
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
#if TX_WITH_INTERRUPT
|
|
ISR(USCIAB1TX, uart1_tx_interrupt)
|
|
{
|
|
ENERGEST_ON(ENERGEST_TYPE_IRQ);
|
|
if(IFG2 & UCA0TXIFG) {
|
|
if(ringbuf_elements(&txbuf) == 0) {
|
|
transmitting = 0;
|
|
} else {
|
|
UCA0TXBUF = ringbuf_get(&txbuf);
|
|
}
|
|
}
|
|
|
|
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
|
|
}
|
|
#endif /* TX_WITH_INTERRUPT */
|
|
/*---------------------------------------------------------------------------*/
|