diff options
Diffstat (limited to 'os/hal/platforms/MSP430/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/MSP430/serial_lld.c | 328 |
1 files changed, 328 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..ed17c45c2 --- /dev/null +++ b/os/hal/platforms/MSP430/serial_lld.c @@ -0,0 +1,328 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * @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 and types. */
+/*===========================================================================*/
+
+/** @brief Driver default configuration.*/
+static const SerialConfig default_config = {
+ UBR(SERIAL_DEFAULT_BITRATE),
+ 0,
+ CHAR
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+static void set_error(SerialDriver *sdp, uint8_t urctl) {
+ flagsmask_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();
+ chnAddFlagsI(sdp, sts);
+ chSysUnlockFromIsr();
+}
+
+#if USE_MSP430_USART0 || defined(__DOXYGEN__)
+static void notify1(GenericQueue *qp) {
+
+ (void)qp;
+ if (!(U0IE & UTXIE0)) {
+ msg_t b = sdRequestDataI(&SD1);
+ if (b != Q_EMPTY) {
+ U0IE |= UTXIE0;
+ U0TXBUF = (uint8_t)b;
+ }
+ }
+}
+
+/**
+ * @brief USART0 initialization.
+ *
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void usart0_init(const SerialConfig *config) {
+
+ U0CTL = SWRST; /* Resets the USART. */
+ /* USART init */
+ U0TCTL = SSEL0 | SSEL1; /* SMCLK as clock source. */
+ U0MCTL = config->sc_mod; /* Modulator. */
+ U0BR1 = (uint8_t)(config->sc_div >> 8); /* Divider high. */
+ U0BR0 = (uint8_t)(config->sc_div >> 0); /* Divider low. */
+ /* Clear USART status.*/
+ (void)U0RXBUF;
+ U0RCTL = 0;
+ /* USART enable.*/
+ U0ME |= UTXE0 + URXE0; /* Enables the USART. */
+ U0CTL = config->sc_ctl & ~SWRST; /* Various settings. */
+ 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(GenericQueue *qp) {
+
+ (void)qp;
+ if (!(U1IE & UTXIE1)) {
+ msg_t b = sdRequestDataI(&SD2);
+ if (b != Q_EMPTY) {
+ U1IE |= UTXIE1;
+ U1TXBUF = (uint8_t)b;
+ }
+ }
+}
+
+/**
+ * @brief USART1 initialization.
+ *
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void usart1_init(const SerialConfig *config) {
+
+ U1CTL = SWRST; /* Resets the USART. */
+ /* USART init.*/
+ U1TCTL = SSEL0 | SSEL1; /* SMCLK as clock source. */
+ U1MCTL = config->sc_mod; /* Modulator. */
+ U1BR1 = (uint8_t)(config->sc_div >> 8); /* Divider high. */
+ U1BR0 = (uint8_t)(config->sc_div >> 0); /* Divider low. */
+ /* Clear USART status.*/
+ (void)U0RXBUF;
+ U1RCTL = 0;
+ /* USART enable.*/
+ U1ME |= UTXE0 + URXE0; /* Enables the USART. */
+ U1CTL = config->sc_ctl & ~SWRST; /* Various settings. */
+ U1IE |= URXIE0; /* Enables RX interrupt. */
+}
+
+/**
+ * @brief USART1 de-initialization.
+ */
+static void usart1_deinit(void) {
+
+ U1IE &= ~URXIE0;
+ U1CTL = SWRST;
+}
+#endif /* USE_MSP430_USART1 */
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if USE_MSP430_USART0 || defined(__DOXYGEN__)
+/**
+ * @brief USART0 TX interrupt handler.
+ *
+ * @isr
+ */
+CH_IRQ_HANDLER(USART0TX) {
+ msg_t b;
+
+ CH_IRQ_PROLOGUE();
+
+ chSysLockFromIsr();
+ b = sdRequestDataI(&SD1);
+ chSysUnlockFromIsr();
+ if (b < Q_OK)
+ U0IE &= ~UTXIE0;
+ else
+ U0TXBUF = b;
+
+ CH_IRQ_EPILOGUE();
+}
+
+/**
+ * @brief USART0 RX interrupt handler.
+ *
+ * @isr
+ */
+CH_IRQ_HANDLER(USART0RX) {
+ uint8_t urctl;
+
+ CH_IRQ_PROLOGUE();
+
+ if ((urctl = U0RCTL) & RXERR)
+ set_error(&SD1, urctl);
+ chSysLockFromIsr();
+ sdIncomingDataI(&SD1, U0RXBUF);
+ chSysUnlockFromIsr();
+
+ CH_IRQ_EPILOGUE();
+}
+#endif /* USE_MSP430_USART0 */
+
+#if USE_MSP430_USART1 || defined(__DOXYGEN__)
+/**
+ * @brief USART1 TX interrupt handler.
+ *
+ * @isr
+ */
+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();
+}
+
+/**
+ * @brief USART1 RX interrupt handler.
+ *
+ * @isr
+ */
+CH_IRQ_HANDLER(USART1RX_VECTOR) {
+ uint8_t urctl;
+
+ CH_IRQ_PROLOGUE();
+
+ if ((urctl = U1RCTL) & RXERR)
+ set_error(&SD2, urctl);
+ chSysLockFromIsr();
+ sdIncomingDataI(&SD2, U1RXBUF);
+ chSysUnlockFromIsr();
+
+ 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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