121 lines
4 KiB
C
121 lines
4 KiB
C
/*
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* Copyright (c) 2011, 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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/*
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* Yet another machine dependent MSP430X UART0 code.
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* IF2, etc. can not be used here... need to abstract to some macros
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* later.
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*/
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#include "contiki.h"
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#include <stdlib.h>
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#include "sys/energest.h"
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#include "dev/uart0.h"
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#include "dev/watchdog.h"
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#include "isr_compat.h"
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static int (*uart0_input_handler)(unsigned char c);
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static volatile uint8_t transmitting;
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/*---------------------------------------------------------------------------*/
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uint8_t
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uart0_active(void)
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{
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return (UCA0STAT & UCBUSY) | transmitting;
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}
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/*---------------------------------------------------------------------------*/
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void
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uart0_set_input(int (*input)(unsigned char c))
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{
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uart0_input_handler = input;
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}
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/*---------------------------------------------------------------------------*/
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void
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uart0_writeb(unsigned char c)
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{
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watchdog_periodic();
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/* Loop until the transmission buffer is available. */
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while((UCA0STAT & UCBUSY));
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/* Transmit the data. */
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UCA0TXBUF = c;
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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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uart0_init(unsigned long ubr)
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{
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/* RS232 */
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UCA0CTL1 |= UCSWRST; /* Hold peripheral in reset state */
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UCA0CTL1 |= UCSSEL_2; /* CLK = SMCLK */
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ubr = (MSP430_CPU_SPEED / ubr);
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UCA0BR0 = ubr & 0xff;
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UCA0BR1 = (ubr >> 8) & 0xff;
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UCA0MCTL = UCBRS_3; /* Modulation UCBRSx = 3 */
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P3DIR &= ~0x20; /* P3.5 = USCI_A0 RXD as input */
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P3DIR |= 0x10; /* P3.4 = USCI_A0 TXD as output */
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P3SEL |= 0x30; /* P3.4,5 = USCI_A0 TXD/RXD */
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/*UCA0CTL1 &= ~UCSWRST;*/ /* Initialize USCI state machine */
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transmitting = 0;
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/* XXX Clear pending interrupts before enable */
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UCA0IE &= ~UCRXIFG;
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UCA0IE &= ~UCTXIFG;
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UCA0CTL1 &= ~UCSWRST; /* Initialize USCI state machine **before** enabling interrupts */
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UCA0IE |= UCRXIE; /* Enable UCA0 RX interrupt */
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}
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/*---------------------------------------------------------------------------*/
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ISR(USCI_A0, uart0_rx_interrupt)
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{
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uint8_t c;
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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if(UCA0IV == 2) {
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if(UCA0STAT & UCRXERR) {
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c = UCA0RXBUF; /* Clear error flags by forcing a dummy read. */
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} else {
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c = UCA0RXBUF;
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if(uart0_input_handler != NULL) {
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if(uart0_input_handler(c)) {
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LPM4_EXIT;
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}
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}
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}
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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