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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file MSP430/serial_lld.c
* @brief MSP430 low level serial driver code
* @addtogroup MSP430_SERIAL
* @{
*/
#include <ch.h>
#include <serial.h>
#include <signal.h>
#include "board.h"
#if USE_MSP430_USART0 || defined(__DOXYGEN__)
/** @brief USART0 serial driver identifier.*/
SerialDriver SD1;
#endif
#if USE_MSP430_USART1 || defined(__DOXYGEN__)
/** @brief USART1 serial driver identifier.*/
SerialDriver SD2;
#endif
/** @brief Driver default configuration.*/
static const SerialDriverConfig default_config = {
UBR(DEFAULT_USART_BITRATE),
0,
CHAR
};
/*===========================================================================*/
/* Low Level Driver local functions. */
/*===========================================================================*/
static void set_error(uint8_t urctl, SerialDriver *sdp) {
sdflags_t sts = 0;
if (urctl & OE)
sts |= SD_OVERRUN_ERROR;
if (urctl & PE)
sts |= SD_PARITY_ERROR;
if (urctl & FE)
sts |= SD_FRAMING_ERROR;
if (urctl & BRK)
sts |= SD_BREAK_DETECTED;
chSysLockFromIsr();
sdAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if USE_MSP430_USART0 || defined(__DOXYGEN__)
static void notify1(void) {
if (!(U0IE & UTXIE0)) {
chSysLockFromIsr();
U0TXBUF = (uint8_t)sdRequestDataI(&SD1);
chSysUnlockFromIsr();
U0IE |= UTXIE0;
}
}
/**
* @brief USART0 initialization.
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart0_init(const SerialDriverConfig *config) {
U0CTL = SWRST; /* Resets the USART, it should already be.*/
/* USART init */
U0TCTL = SSEL0 | SSEL1; /* SMCLK as clock source.*/
U0MCTL = config->mod; /* Modulator.*/
U0BR1 = (uint8_t)(config->div >> 8); /* Divider high.*/
U0BR0 = (uint8_t)(config->div >> 0); /* Divider low.*/
/* Clear USART status.*/
(void)U0RXBUF;
U0RCTL = 0;
/* USART enable.*/
U0ME |= UTXE0 + URXE0; /* Enables the USART.*/
U0CTL = config->ctl & ~SWRST; /* Various settings, clears reset state.*/
U0IE |= URXIE0; /* Enables RX interrupt.*/
}
/**
* @brief USART0 de-initialization.
*/
static void usart0_deinit(void) {
U0IE &= ~URXIE0;
U0CTL = SWRST;
}
#endif /* USE_MSP430_USART0 */
#if USE_MSP430_USART1 || defined(__DOXYGEN__)
static void notify2(void) {
if (!(U1IE & UTXIE1)) {
U1TXBUF = (uint8_t)sdRequestDataI(&SD2);
U1IE |= UTXIE1;
}
}
/**
* @brief USART1 initialization.
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart1_init(const SerialDriverConfig *config) {
U1CTL = SWRST; /* Resets the USART, it should already be.*/
/* USART init.*/
U1TCTL = SSEL0 | SSEL1; /* SMCLK as clock source.*/
U1MCTL = config->mod; /* Modulator.*/
U1BR1 = (uint8_t)(config->div >> 8); /* Divider high.*/
U1BR0 = (uint8_t)(config->div >> 0); /* Divider low.*/
/* Clear USART status.*/
(void)U0RXBUF;
U1RCTL = 0;
/* USART enable.*/
U1ME |= UTXE0 + URXE0; /* Enables the USART.*/
U1CTL = config->ctl & ~SWRST; /* Various settings, clears reset state.*/
U1IE |= URXIE0; /* Enables RX interrupt.*/
}
/**
* @brief USART1 de-initialization.
*/
static void usart1_deinit(void) {
U1IE &= ~URXIE0;
U1CTL = SWRST;
}
#endif /* USE_MSP430_USART1 */
/*===========================================================================*/
/* Low Level Driver interrupt handlers. */
/*===========================================================================*/
#if USE_MSP430_USART0 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(USART0TX_VECTOR) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD1);
chSysUnlockFromIsr();
if (b < Q_OK)
U0IE &= ~UTXIE0;
else
U0TXBUF = b;
CH_IRQ_EPILOGUE();
}
CH_IRQ_HANDLER(USART0RX_VECTOR) {
uint8_t urctl;
CH_IRQ_PROLOGUE();
if ((urctl = U0RCTL) & RXERR)
set_error(urctl, &SD1);
chSysLockFromIsr();
sdIncomingDataI(&SD1, U0RXBUF);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
#endif /* USE_MSP430_USART0 */
#if USE_MSP430_USART1 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(USART1TX_VECTOR) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD2);
chSysUnlockFromIsr();
if (b < Q_OK)
U1IE &= ~UTXIE1;
else
U1TXBUF = b;
CH_IRQ_EPILOGUE();
}
CH_IRQ_HANDLER(USART1RX_VECTOR) {
uint8_t urctl;
CH_IRQ_PROLOGUE();
if ((urctl = U1RCTL) & RXERR)
set_error(urctl, &SD2);
chSysLockFromIsr();
sdIncomingDataI(&SD2, U1RXBUF);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
#endif /* USE_MSP430_USART1 */
/*===========================================================================*/
/* Low Level Driver exported functions. */
/*===========================================================================*/
/**
* Low level serial driver initialization.
*/
void sd_lld_init(void) {
#if USE_MSP430_USART0
sdObjectInit(&SD1, NULL, notify1);
/* I/O pins for USART0.*/
P3SEL |= BV(4) + BV(5);
#endif
#if USE_MSP430_USART1
sdObjectInit(&SD2, NULL, notify2);
/* I/O pins for USART1.*/
P3SEL |= BV(6) + BV(7);
#endif
}
/**
* @brief Low level serial driver configuration and (re)start.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] config the architecture-dependent serial driver configuration.
* If this parameter is set to @p NULL then a default
* configuration is used.
*/
void sd_lld_start(SerialDriver *sdp, const SerialDriverConfig *config) {
if (config == NULL)
config = &default_config;
#if USE_MSP430_USART0
if (&SD1 == sdp) {
usart0_init(config);
return;
}
#endif
#if USE_MSP430_USART1
if (&SD2 == sdp) {
usart1_init(config);
return;
}
#endif
}
/**
* @brief Low level serial driver stop.
* @details De-initializes the USART, stops the associated clock, resets the
* interrupt vector.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
void sd_lld_stop(SerialDriver *sdp) {
#if USE_MSP430_USART0
if (&SD1 == sdp) {
usart0_deinit();
return;
}
#endif
#if USE_MSP430_USART1
if (&SD2 == sdp) {
usart1_deinit();
return;
}
#endif
}
/** @} */
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