234 lines
6.7 KiB
C
234 lines
6.7 KiB
C
/*
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Copyright 2007, Freie Universitaet Berlin. All rights reserved.
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These sources were developed at the Freie Universität Berlin, Computer
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Systems and Telematics group.
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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 are
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met:
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- 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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- 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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- Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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This software is provided by FUB and the contributors on an "as is"
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basis, without any representations or warranties of any kind, express
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or implied including, but not limited to, representations or
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warranties of non-infringement, merchantability or fitness for a
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particular purpose. In no event shall FUB or contributors be liable
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for any direct, indirect, incidental, special, exemplary, or
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consequential damages (including, but not limited to, procurement of
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substitute goods or services; loss of use, data, or profits; or
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business interruption) however caused and on any theory of liability,
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whether in contract, strict liability, or tort (including negligence
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or otherwise) arising in any way out of the use of this software, even
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if advised of the possibility of such damage.
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This implementation was developed by the CST group at the FUB.
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For documentation and questions please use the web site
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http://scatterweb.mi.fu-berlin.de and the mailinglist
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scatterweb@lists.spline.inf.fu-berlin.de (subscription via the Website).
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Berlin, 2007
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*/
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/**
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* @file ScatterWeb.Uart.c
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* @addtogroup interfaces
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* @brief UART interface
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* @author Michael Baar <baar@inf.fu-berlin.de>
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*
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* UART switch for RS232 and SPI protocols on UART1 written for
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* ScatterWeb MSB boards. Compatible to ScatterWeb EOS,
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* ScatterWeb Bootload and Contiki.
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*/
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#include <io.h>
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#include <signal.h>
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#include <string.h>
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#include "dev/msb430-uart1.h"
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#include "msp430.h"
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#include "dev/lpm.h"
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#ifndef U1ME
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#define U1ME ME2
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#endif
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static volatile unsigned char uart_mode = UART_MODE_RESET;
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static volatile unsigned char uart_lockcnt = 0;
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volatile uint8_t uart_edge = 0;
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static unsigned char uart_speed_br0[UART_NUM_MODES];
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static unsigned char uart_speed_br1[UART_NUM_MODES];
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static unsigned char uart_speed_bmn[UART_NUM_MODES];
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static uart_handler_t uart_handler[UART_NUM_MODES] = {NULL, NULL};
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/*---------------------------------------------------------------------------*/
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static void
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uart_configure(unsigned mode)
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{
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_DINT(); /* disable interrupts */
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UART_WAIT_TXDONE(); /* wait till all buffered data has been transmitted */
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if(mode == UART_MODE_RS232) {
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P5OUT |= 0x01;
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/* unselect SPI */
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P3SEL |= 0xC0;
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/* select rs232 */
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UCTL1 = SWRST | CHAR; /* 8-bit character */
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UTCTL1 |= SSEL1; /* UCLK = MCLK */
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/* activate */
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U1ME |= UTXE1 | URXE1; /* Enable USART1 TXD/RXD */
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} else if(mode == UART_MODE_SPI) {
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P3SEL &= ~0xC0; /* unselect RS232 */
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// to SPI mode
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UCTL1 = SWRST | CHAR | SYNC | MM; /* 8-bit SPI Master */
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/*
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* SMCLK, 3-pin mode, clock idle low, data valid on
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* rising edge, UCLK delayed
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*/
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UTCTL1 |= CKPH | SSEL1 | SSEL0 | STC; /* activate */
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U1ME |= USPIE1; /* Enable USART1 SPI */
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}
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/* restore speed settings */
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UBR01 = uart_speed_br0[mode]; /* set baudrate */
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UBR11 = uart_speed_br1[mode];
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UMCTL1 = uart_speed_bmn[mode]; /* set modulation */
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UCTL1 &= ~SWRST; /* clear reset flag */
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_EINT(); /* enable interrupts */
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}
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/*---------------------------------------------------------------------------*/
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void
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uart_set_speed(unsigned mode, unsigned ubr0,
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unsigned ubr1, unsigned umctl)
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{
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/* store the setting */
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uart_speed_br0[mode] = ubr0; /* baudrate */
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uart_speed_br1[mode] = ubr1; /* baudrate */
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uart_speed_bmn[mode] = umctl; /* modulation */
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/* reconfigure, if mode active */
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if(uart_mode == mode) {
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uart_configure(mode);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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uart_set_handler(unsigned mode, uart_handler_t handler)
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{
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/* store the setting */
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uart_handler[mode] = handler;
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if(mode == uart_mode) {
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if(handler == NULL) {
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IE2 &= ~URXIE1; /* Disable USART1 RX interrupt */
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} else {
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IE2 |= URXIE1; /* Enable USART1 RX interrupt */
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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uart_lock(unsigned mode)
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{
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/* already locked? */
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if(uart_mode != mode && uart_lockcnt > 0) {
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return 0;
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}
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/* increase lock count */
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uart_lockcnt++;
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/* switch mode (if neccessary) */
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uart_set_mode(mode);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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int
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uart_lock_wait(unsigned mode)
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{
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while(UART_WAIT_LOCK(mode)) {
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_NOP();
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}
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return uart_lock(mode);
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}
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/*---------------------------------------------------------------------------*/
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int
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uart_unlock(unsigned mode)
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{
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if((uart_lockcnt == 0) || (mode != uart_mode)) {
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uart_lockcnt = 0;
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uart_set_mode(UART_MODE_DEFAULT);
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return 0;
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}
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/* decrement lock */
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if(uart_lockcnt > 0) {
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uart_lockcnt--;
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/* if no more locks, switch back to default mode */
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if(uart_lockcnt == 0) {
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uart_set_mode(UART_MODE_DEFAULT);
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}
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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uart_set_mode(unsigned mode)
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{
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/* do nothing if the mode is already set */
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if(mode == uart_mode) {
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return;
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}
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IE2 &= ~(URXIE1 | UTXIE1); /* disable irq */
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uart_configure(mode); /* configure uart parameters */
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uart_mode = mode;
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if(uart_handler[mode] != NULL) {
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IE2 |= URXIE1; /* Enable USART1 RX interrupt */
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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uart_get_mode(void)
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{
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return uart_mode;
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}
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/*---------------------------------------------------------------------------*/
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interrupt(UART1RX_VECTOR)
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uart_rx(void)
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{
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uart_handler_t handler = uart_handler[uart_mode];
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int c;
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if(!(IFG2 & URXIFG1)) {
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/* If rising edge is detected, toggle & return */
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uart_edge = 1;
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U1TCTL &= ~URXSE;
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U1TCTL |= URXSE;
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_BIC_SR_IRQ(LPM3_bits);
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return;
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}
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uart_edge = 0;
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if(!(URCTL1 & RXERR)) {
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c = UART_RX;
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if(handler(c)) {
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_BIC_SR_IRQ(LPM3_bits);
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}
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} else {
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/* read out the char to clear the interrupt flags. */
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c = UART_RX;
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}
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}
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