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ChibiOS/os/hal/platforms/MSP430X/serial_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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 SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
#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
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/** @brief Driver default configuration.*/
static const SerialConfig default_config = {
UBR(SERIAL_DEFAULT_BITRATE),
UCBRS_0 + UCBRF_13 + UCOS16, /* Modln UCBRSx=0, UCBRFx=0, over sampling */
0x00 /* parity disabled, 8-bit data, one stop bit, UART mode, asynchronous mode */
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static void set_error(SerialDriver *sdp, uint8_t urctl) {
ioflags_t sts = 0;
if (urctl & UCOE)
sts |= SD_OVERRUN_ERROR;
if (urctl & UCPE)
sts |= SD_PARITY_ERROR;
if (urctl & UCFE)
sts |= SD_FRAMING_ERROR;
if (urctl & UCBRK)
sts |= SD_BREAK_DETECTED;
chSysLockFromIsr();
chIOAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if USE_MSP430_USART0 || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
if (!(UCA0IE & UCTXIE)) {
msg_t b = sdRequestDataI(&SD1);
if (b != Q_EMPTY) {
UCA0IE |= UCTXIE;
UCA0TXBUF = (uint8_t)b;
}
}
}
/**
* @brief USART0 initialization.
*
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart0_init(const SerialConfig *config) {
UCA0CTL1 = UCSWRST; /* Put state machine in reset. */
/* USART init */
P3SEL |= (P3_O_TXD0_MASK | P3_I_RXD0_MASK);
UCA0CTL1 |= UCSSEL_2; /* SMCLK as clock source. */
UCA0MCTL = config->sc_mod; /* Modulator. */
UCA0BR1 = (uint8_t)(config->sc_div >> 8); /* Divider high. */
UCA0BR0 = (uint8_t)(config->sc_div >> 0); /* Divider low. */
/* Clear USART status.*/
(void)UCA0RXBUF;
/* USART enable.*/
UCA0CTL0 = config->sc_ctl; /* Various settings. */
UCA0CTL1 &= ~UCSWRST; /* Initialize USCI state machine. */
UCA0IE |= UCRXIE; /* Enables RX interrupt. */
}
/**
* @brief USART0 de-initialization.
*/
static void usart0_deinit(void) {
UCA0IE &= ~UCRXIE; /* Disables RX interrupt. */
UCA0CTL1 |= UCSWRST; /* Put state machine in reset. */
}
#endif /* USE_MSP430_USART0 */
#if USE_MSP430_USART1 || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
if (!(UCA1IE & UCTXIE)) {
msg_t b = sdRequestDataI(&SD2);
if (b != Q_EMPTY) {
UCA1IE |= UCTXIE;
UCA1TXBUF = (uint8_t)b;
}
}
}
/**
* @brief USART1 initialization.
*
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart1_init(const SerialConfig *config) {
UCA1CTL1 = UCSWRST; /* Put state machine in reset. */
/* USART init */
P5SEL |= (P5_O_TXD1_MASK | P5_I_RXD1_MASK);
UCA1CTL1 |= UCSSEL_2; /* SMCLK as clock source. */
UCA1MCTL = config->sc_mod; /* Modulator. */
UCA1BR1 = (uint8_t)(config->sc_div >> 8); /* Divider high. */
UCA1BR0 = (uint8_t)(config->sc_div >> 0); /* Divider low. */
/* Clear USART status.*/
(void)UCA1RXBUF;
/* USART enable.*/
UCA1CTL0 = config->sc_ctl; /* Various settings. */
UCA1CTL1 &= ~UCSWRST; /* Initialize USCI state machine. */
UCA1IE |= UCRXIE; /* Enables RX interrupt. */
}
/**
* @brief USART1 de-initialization.
*/
static void usart1_deinit(void) {
UCA1IE &= ~UCRXIE; /* Disables RX interrupt. */
UCA1CTL1 |= UCSWRST; /* Put state machine in reset. */
}
#endif /* USE_MSP430_USART1 */
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if USE_MSP430_USART0 || defined(__DOXYGEN__)
/**
* @brief USART0 TX interrupt handler segment.
*/
#define _USART0_TRANSMIT_ISR() { \
msg_t b; \
chSysLockFromIsr(); \
b = sdRequestDataI(&SD1); \
chSysUnlockFromIsr(); \
if (b < Q_OK) \
UCA0IE &= ~UCTXIE; \
else \
UCA0TXBUF = b; \
}
/**
* @brief USART0 RX interrupt handler segment.
*/
#define _USART0_RECEIVE_ISR() { \
uint8_t urctl; \
if ((urctl = UCA0STAT) & UCRXERR) \
set_error(&SD1, urctl); \
chSysLockFromIsr(); \
sdIncomingDataI(&SD1, UCA0RXBUF); \
chSysUnlockFromIsr(); \
}
/**
* @brief USART0 TX/RX interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USCI_A0) {
CH_IRQ_PROLOGUE();
#if defined(__IAR_SYSTEMS_ICC__)
switch(__even_in_range(UCA0IV,4))
#else
switch(*(volatile uint16_t*)UCA0IV)
#endif
{
case 2: /* Vector 2 - RXIFG */
_USART0_RECEIVE_ISR();
break;
case 4: /* Vector 4 - TXIFG */
_USART0_TRANSMIT_ISR();
break;
default:
break;
}
CH_IRQ_EPILOGUE();
}
#endif /* USE_MSP430_USART0 */
#if USE_MSP430_USART1 || defined(__DOXYGEN__)
/**
* @brief USART1 TX interrupt handler segment.
*/
#define _USART1_TRANSMIT_ISR() { \
msg_t b; \
chSysLockFromIsr(); \
b = sdRequestDataI(&SD2); \
chSysUnlockFromIsr(); \
if (b < Q_OK) \
UCA1IE &= ~UCTXIE; \
else \
UCA1TXBUF = b; \
}
/**
* @brief USART0 RX interrupt handler segment.
*/
#define _USART1_RECEIVE_ISR() { \
uint8_t urctl; \
if ((urctl = UCA1STAT) & UCRXERR) \
set_error(&SD2, urctl); \
chSysLockFromIsr(); \
sdIncomingDataI(&SD2, UCA1RXBUF); \
chSysUnlockFromIsr(); \
}
/**
* @brief USART1 TX/RX interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USCI_A1) {
CH_IRQ_PROLOGUE();
#if defined(__IAR_SYSTEMS_ICC__)
switch(__even_in_range(UCA1IV,4))
#else
switch(*(volatile uint16_t*)UCA1IV)
#endif
{
case 2: /* Vector 2 - RXIFG */
_USART1_RECEIVE_ISR();
break;
case 4: /* Vector 4 - TXIFG */
_USART1_TRANSMIT_ISR();
break;
default:
break;
}
CH_IRQ_EPILOGUE();
}
#endif /* USE_MSP430_USART1 */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if USE_MSP430_USART0
sdObjectInit(&SD1, NULL, notify1);
#endif
#if USE_MSP430_USART1
sdObjectInit(&SD2, NULL, notify2);
#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.
*
* @notapi
*/
void sd_lld_start(SerialDriver *sdp, const SerialConfig *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
*
* @notapi
*/
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
}
#endif /* HAL_USE_SERIAL */
/** @} */
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