diff options
Diffstat (limited to 'os/hal/ports/AVR/hal_serial_lld.c')
| -rw-r--r-- | os/hal/ports/AVR/hal_serial_lld.c | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/os/hal/ports/AVR/hal_serial_lld.c b/os/hal/ports/AVR/hal_serial_lld.c new file mode 100644 index 000000000..bf1e65729 --- /dev/null +++ b/os/hal/ports/AVR/hal_serial_lld.c @@ -0,0 +1,378 @@ +/*
+ ChibiOS - Copyright (C) 2006..2016 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 AVR/serial_lld.c
+ * @brief AVR low level serial driver code.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_SERIAL || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/**
+ * @brief USART0 serial driver identifier.
+ * @note The name does not follow the convention used in the other ports
+ * (COMn) because a name conflict with the AVR headers.
+ */
+#if AVR_SERIAL_USE_USART0 || defined(__DOXYGEN__)
+SerialDriver SD1;
+
+ /* USARTs are not consistently named across the AVR range */
+ #ifdef USART0_RX_vect
+ #define AVR_SD1_RX_VECT USART0_RX_vect
+ #define AVR_SD1_TX_VECT USART0_UDRE_vect
+ #elif defined(USART_RX_vect)
+ #define AVR_SD1_RX_VECT USART_RX_vect
+ #define AVR_SD1_TX_VECT USART_UDRE_vect
+ #else
+ #error "Cannot find USART to use for SD1"
+ #endif
+#endif /* AVR_SERIAL_USE_USART0 */
+
+/**
+ * @brief USART1 serial driver identifier.
+ * @note The name does not follow the convention used in the other ports
+ * (COMn) because a name conflict with the AVR headers.
+ */
+#if AVR_SERIAL_USE_USART1 || defined(__DOXYGEN__)
+SerialDriver SD2;
+
+ /* Check if USART1 exists for this MCU */
+ #ifdef USART1_RX_vect
+ #define AVR_SD2_RX_VECT USART1_RX_vect
+ #define AVR_SD2_TX_VECT USART1_UDRE_vect
+ #else
+ #error "Cannot find USART to use for SD2"
+ #endif
+#endif /* AVR_SERIAL_USE_USART1 */
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/**
+ * @brief Driver default configuration.
+ */
+static const SerialConfig default_config = {
+ UBRR(SERIAL_DEFAULT_BITRATE),
+ USART_CHAR_SIZE_8
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+static void set_error(uint8_t sra, SerialDriver *sdp) {
+ eventflags_t sts = 0;
+ uint8_t dor = 0;
+ uint8_t upe = 0;
+ uint8_t fe = 0;
+
+#if AVR_SERIAL_USE_USART0
+ if (&SD1 == sdp) {
+ dor = (1 << DOR0);
+ upe = (1 << UPE0);
+ fe = (1 << FE0);
+ }
+#endif
+
+#if AVR_SERIAL_USE_USART1
+ if (&SD2 == sdp) {
+ dor = (1 << DOR1);
+ upe = (1 << UPE1);
+ fe = (1 << FE1);
+ }
+#endif
+
+ if (sra & dor)
+ sts |= SD_OVERRUN_ERROR;
+ if (sra & upe)
+ sts |= SD_PARITY_ERROR;
+ if (sra & fe)
+ sts |= SD_FRAMING_ERROR;
+ osalSysLockFromISR();
+ chnAddFlagsI(sdp, sts);
+ osalSysUnlockFromISR();
+}
+
+#if AVR_SERIAL_USE_USART0 || defined(__DOXYGEN__)
+static void notify1(io_queue_t *qp) {
+
+ (void)qp;
+ UCSR0B |= (1 << UDRIE0);
+}
+
+/**
+ * @brief USART0 initialization.
+ *
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void usart0_init(const SerialConfig *config) {
+
+ UBRR0L = config->sc_brr;
+ UBRR0H = config->sc_brr >> 8;
+ UCSR0A = 0;
+ UCSR0B = (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0);
+ switch (config->sc_bits_per_char) {
+ case USART_CHAR_SIZE_5:
+ UCSR0C = 0;
+ break;
+ case USART_CHAR_SIZE_6:
+ UCSR0C = (1 << UCSZ00);
+ break;
+ case USART_CHAR_SIZE_7:
+ UCSR0C = (1 << UCSZ01);
+ break;
+ case USART_CHAR_SIZE_9:
+ UCSR0B |= (1 << UCSZ02);
+ UCSR0C = (1 << UCSZ00) | (1 << UCSZ01);
+ break;
+ case USART_CHAR_SIZE_8:
+ default:
+ UCSR0C = (1 << UCSZ00) | (1 << UCSZ01);
+ }
+}
+
+/**
+ * @brief USART0 de-initialization.
+ */
+static void usart0_deinit(void) {
+
+ UCSR0A = 0;
+ UCSR0B = 0;
+ UCSR0C = 0;
+}
+#endif
+
+#if AVR_SERIAL_USE_USART1 || defined(__DOXYGEN__)
+static void notify2(io_queue_t *qp) {
+
+ (void)qp;
+ UCSR1B |= (1 << UDRIE1);
+}
+
+/**
+ * @brief USART1 initialization.
+ *
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void usart1_init(const SerialConfig *config) {
+
+ UBRR1L = config->sc_brr;
+ UBRR1H = config->sc_brr >> 8;
+ UCSR1A = 0;
+ UCSR1B = (1 << RXEN1) | (1 << TXEN1) | (1 << RXCIE1);
+ switch (config->sc_bits_per_char) {
+ case USART_CHAR_SIZE_5:
+ UCSR1C = 0;
+ break;
+ case USART_CHAR_SIZE_6:
+ UCSR1C = (1 << UCSZ10);
+ break;
+ case USART_CHAR_SIZE_7:
+ UCSR1C = (1 << UCSZ11);
+ break;
+ case USART_CHAR_SIZE_9:
+ UCSR1B |= (1 << UCSZ12);
+ UCSR1C = (1 << UCSZ10) | (1 << UCSZ11);
+ break;
+ case USART_CHAR_SIZE_8:
+ default:
+ UCSR1C = (1 << UCSZ10) | (1 << UCSZ11);
+ }
+}
+
+/**
+ * @brief USART1 de-initialization.
+ */
+static void usart1_deinit(void) {
+
+ UCSR1A = 0;
+ UCSR1B = 0;
+ UCSR1C = 0;
+}
+#endif
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if AVR_SERIAL_USE_USART0 || defined(__DOXYGEN__)
+/**
+ * @brief USART0 RX interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(AVR_SD1_RX_VECT) {
+ uint8_t sra;
+
+ OSAL_IRQ_PROLOGUE();
+
+ sra = UCSR0A;
+ if (sra & ((1 << DOR0) | (1 << UPE0) | (1 << FE0)))
+ set_error(sra, &SD1);
+ osalSysLockFromISR();
+ sdIncomingDataI(&SD1, UDR0);
+ osalSysUnlockFromISR();
+
+ OSAL_IRQ_EPILOGUE();
+}
+
+/**
+ * @brief USART0 TX interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(AVR_SD1_TX_VECT) {
+ msg_t b;
+
+ OSAL_IRQ_PROLOGUE();
+
+ osalSysLockFromISR();
+ b = sdRequestDataI(&SD1);
+ osalSysUnlockFromISR();
+ if (b < MSG_OK)
+ UCSR0B &= ~(1 << UDRIE0);
+ else
+ UDR0 = b;
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif /* AVR_SERIAL_USE_USART0 */
+
+#if AVR_SERIAL_USE_USART1 || defined(__DOXYGEN__)
+/**
+ * @brief USART1 RX interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(AVR_SD2_RX_VECT) {
+ uint8_t sra;
+
+ OSAL_IRQ_PROLOGUE();
+
+ sra = UCSR1A;
+ if (sra & ((1 << DOR1) | (1 << UPE1) | (1 << FE1)))
+ set_error(sra, &SD2);
+ osalSysLockFromISR();
+ sdIncomingDataI(&SD2, UDR1);
+ osalSysUnlockFromISR();
+
+ OSAL_IRQ_EPILOGUE();
+}
+
+/**
+ * @brief USART1 TX interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(AVR_SD2_TX_VECT) {
+ msg_t b;
+
+ OSAL_IRQ_PROLOGUE();
+
+ osalSysLockFromISR();
+ b = sdRequestDataI(&SD2);
+ osalSysUnlockFromISR();
+ if (b < MSG_OK)
+ UCSR1B &= ~(1 << UDRIE1);
+ else
+ UDR1 = b;
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif /* AVR_SERIAL_USE_USART1 */
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level serial driver initialization.
+ *
+ * @notapi
+ */
+void sd_lld_init(void) {
+
+#if AVR_SERIAL_USE_USART0
+ sdObjectInit(&SD1, NULL, notify1);
+#endif
+#if AVR_SERIAL_USE_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 AVR_SERIAL_USE_USART0
+ if (&SD1 == sdp) {
+ usart0_init(config);
+ return;
+ }
+#endif
+#if AVR_SERIAL_USE_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 AVR_SERIAL_USE_USART0
+ if (&SD1 == sdp)
+ usart0_deinit();
+#endif
+#if AVR_SERIAL_USE_USART1
+ if (&SD2 == sdp)
+ usart1_deinit();
+#endif
+}
+
+#endif /* HAL_USE_SERIAL */
+
+/** @} */
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