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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 ports/MSP430/msp430_serial.c
* @brief MSP430 Serial driver code.
* @addtogroup MSP430_SERIAL
* @{
*/
#include <ch.h>
#include <signal.h>
#include "board.h"
#include "msp430_serial.h"
static void SetError(uint8_t urctl, FullDuplexDriver *com) {
dflags_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();
chFDDAddFlagsI(com, sts);
chSysUnlockFromIsr();
}
#if USE_MSP430_USART0 || defined(__DOXYGEN__)
/** @brief USART0 serial driver identifier.*/
FullDuplexDriver COM1;
static uint8_t ib1[SERIAL_BUFFERS_SIZE];
static uint8_t ob1[SERIAL_BUFFERS_SIZE];
CH_IRQ_HANDLER(USART0TX_VECTOR) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = chFDDRequestDataI(&COM1);
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)
SetError(urctl, &COM1);
chSysLockFromIsr();
chFDDIncomingDataI(&COM1, U0RXBUF);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
static void OutNotify1(void) {
if (!(U0IE & UTXIE0)) {
chSysLockFromIsr();
U0TXBUF = (uint8_t)chFDDRequestDataI(&COM1);
chSysUnlockFromIsr();
U0IE |= UTXIE0;
}
}
/**
* @brief USART0 setup.
* @details This function must be invoked with interrupts disabled.
* @param div The divider value as calculated by the @p UBR() macro.
* @param mod The value for the @p U0MCTL register.
* @param ctl The value for the @p U0CTL register.
* @note Does not reset the I/O queues.
*/
void usart0_setup(uint16_t div, uint8_t mod, uint8_t ctl) {
U0CTL = SWRST; /* Resets the USART, it should already be */
/* USART init */
U0TCTL = SSEL0 | SSEL1; /* SMCLK as clock source */
U0MCTL = mod; /* Modulator */
U0BR1 = (uint8_t)(div >> 8); /* Divider high */
U0BR0 = (uint8_t)(div >> 0); /* Divider low */
/* Clear USART status */
(void)U0RXBUF;
U0RCTL = 0;
/* USART enable */
P3SEL |= BV(4) + BV(5); /* I/O pins for USART 0 */
U0ME |= UTXE0 + URXE0; /* Enables the USART */
U0CTL = ctl & ~SWRST; /* Various settings, clears reset state */
U0IE |= URXIE0; /* Enables RX interrupt */
}
#endif /* USE_MSP430_USART0 */
#if USE_MSP430_USART1 || defined(__DOXYGEN__)
/** @brief USART1 serial driver identifier.*/
FullDuplexDriver COM2;
static uint8_t ib2[SERIAL_BUFFERS_SIZE];
static uint8_t ob2[SERIAL_BUFFERS_SIZE];
CH_IRQ_HANDLER(USART1TX_VECTOR) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = chFDDRequestDataI(&COM2);
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)
SetError(urctl, &COM2);
chSysLockFromIsr();
chFDDIncomingDataI(&COM2, U1RXBUF);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
static void OutNotify2(void) {
if (!(U1IE & UTXIE1)) {
U1TXBUF = (uint8_t)chFDDRequestDataI(&COM2);
U1IE |= UTXIE1;
}
}
/**
* @brief USART1 setup.
* @details This function must be invoked with interrupts disabled.
* @param[in] div the divider value as calculated by the @p UBR() macro
* @param[in] mod the value for the @p U1MCTL register
* @param[in] ctl the value for the @p U1CTL register.
* @note Must be invoked with interrupts disabled.
* @note Does not reset the I/O queues.
*/
void usart1_setup(uint16_t div, uint8_t mod, uint8_t ctl) {
U1CTL = SWRST; /* Resets the USART, it should already be */
/* USART init */
U1TCTL = SSEL0 | SSEL1; /* SMCLK as clock source */
U1MCTL = mod; /* Modulator */
U1BR1 = (uint8_t)(div >> 8); /* Divider high */
U1BR0 = (uint8_t)(div >> 0); /* Divider low */
/* Clear USART status */
(void)U0RXBUF;
U1RCTL = 0;
/* USART enable */
P3SEL |= BV(6) + BV(7); /* I/O pins for USART 1 */
U1ME |= UTXE0 + URXE0; /* Enables the USART */
U1CTL = ctl & ~SWRST; /* Various settings, clears reset state */
U1IE |= URXIE0; /* Enables RX interrupt */
}
#endif
/**
* @brief Serial driver initialization.
* @note The serial ports are initialized at @p 38400-8-N-1 by default.
*/
void serial_init(void) {
/* I/O queues setup.*/
#if USE_MSP430_USART0
chFDDInit(&COM1, ib1, sizeof ib1, NULL, ob1, sizeof ob1, OutNotify1);
usart0_setup(UBR(DEFAULT_USART_BITRATE), 0, CHAR);
#endif
#if USE_MSP430_USART1
chFDDInit(&COM2, ib2, sizeof ib2, NULL, ob2, sizeof ob2, OutNotify2);
usart1_setup(UBR(DEFAULT_USART_BITRATE), 0, CHAR);
#endif
}
/** @} */
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