cdfa8708e3
* f1xxx is baseline and always included * Cleaned up the names of uart and spi (no x in names) * Updated SPI configuration for WiSMote
160 lines
5.0 KiB
C
160 lines
5.0 KiB
C
/*
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* Copyright (c) 2010, 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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* @(#)$Id: uart1x.c,v 1.1 2010/08/24 16:23:20 joxe Exp $
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*/
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/*
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* Machine dependent MSP430X UART1 code.
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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/uart1.h"
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#include "dev/watchdog.h"
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#include "lib/ringbuf.h"
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static int (*uart1_input_handler)(unsigned char c);
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static volatile uint8_t transmitting;
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#ifdef UART1_CONF_TX_WITH_INTERRUPT
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#define TX_WITH_INTERRUPT UART1_CONF_TX_WITH_INTERRUPT
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#else /* UART1_CONF_TX_WITH_INTERRUPT */
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#define TX_WITH_INTERRUPT 1
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#endif /* UART1_CONF_TX_WITH_INTERRUPT */
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#if TX_WITH_INTERRUPT
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#define TXBUFSIZE 64
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static struct ringbuf txbuf;
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static uint8_t txbuf_data[TXBUFSIZE];
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#endif /* TX_WITH_INTERRUPT */
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/*---------------------------------------------------------------------------*/
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uint8_t
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uart1_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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uart1_set_input(int (*input)(unsigned char c))
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{
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uart1_input_handler = input;
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}
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/*---------------------------------------------------------------------------*/
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void
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uart1_writeb(unsigned char c)
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{
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/* watchdog_periodic(); */
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#if TX_WITH_INTERRUPT
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/* Put the outgoing byte on the transmission buffer. If the buffer
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is full, we just keep on trying to put the byte into the buffer
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until it is possible to put it there. */
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while(ringbuf_put(&txbuf, c) == 0);
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/* If there is no transmission going, we need to start it by putting
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the first byte into the UART. */
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if(transmitting == 0) {
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transmitting = 1;
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UCA0TXBUF = ringbuf_get(&txbuf);
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}
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#else /* TX_WITH_INTERRUPT */
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/* Loop until the transmission buffer is available. */
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while(!(IFG2 & UCA0TXIFG));
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/* Transmit the data. */
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UCA0TXBUF = c;
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#endif /* TX_WITH_INTERRUPT */
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}
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/*---------------------------------------------------------------------------*/
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#if ! WITH_UIP /* If WITH_UIP is defined, putchar() is defined by the SLIP driver */
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#endif /* ! WITH_UIP */
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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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uart1_init(unsigned long ubr)
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{
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/* RS232 */
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P3SEL |= 0x30; /* P3.4,5 = USCI_A0 TXD/RXD */
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UCA0CTL1 |= UCSSEL_2; /* CLK = SMCLK */
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UCA0BR0 = 0x45; /* 8MHz/115200 = 69 = 0x45 */
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UCA0BR1 = 0x00;
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UCA0MCTL = UCBRS2; /* Modulation UCBRSx = 4 */
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UCA0CTL1 &= ~UCSWRST; /* Initialize USCI state machine */
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transmitting = 0;
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}
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/*---------------------------------------------------------------------------*/
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interrupt(USCIAB1RX_VECTOR)
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uart1_rx_interrupt(void)
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{
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uint8_t c;
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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/* Check status register for receive errors. */
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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(uart1_input_handler != NULL) {
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if(uart1_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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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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#if TX_WITH_INTERRUPT
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interrupt(USCIAB1TX_VECTOR)
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uart1_tx_interrupt(void)
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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if(IFG2 & UCA0TXIFG) {
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if(ringbuf_elements(&txbuf) == 0) {
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transmitting = 0;
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} else {
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UCA0TXBUF = ringbuf_get(&txbuf);
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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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#endif /* TX_WITH_INTERRUPT */
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/*---------------------------------------------------------------------------*/
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