diff options
Diffstat (limited to 'os/hal/platforms/MSP430/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/MSP430/serial_lld.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/os/hal/platforms/MSP430/serial_lld.c b/os/hal/platforms/MSP430/serial_lld.c new file mode 100644 index 000000000..4130432cd --- /dev/null +++ b/os/hal/platforms/MSP430/serial_lld.c @@ -0,0 +1,292 @@ +/*
+ 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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