diff options
Diffstat (limited to 'os/hal/platforms/AVR/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/AVR/serial_lld.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/os/hal/platforms/AVR/serial_lld.c b/os/hal/platforms/AVR/serial_lld.c new file mode 100644 index 000000000..0acf15700 --- /dev/null +++ b/os/hal/platforms/AVR/serial_lld.c @@ -0,0 +1,256 @@ +/*
+ 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 AVR/serial_lld.c
+ * @brief AVR low level serial driver code
+ * @addtogroup AVR_SERIAL
+ * @{
+ */
+
+#include <ch.h>
+#include <serial.h>
+
+#if USE_AVR_USART0 || defined(__DOXYGEN__)
+/**
+ * @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.
+ */
+SerialDriver SD1;
+#endif
+#if USE_AVR_USART1 || defined(__DOXYGEN__)
+/**
+ * @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.
+ */
+SerialDriver SD2;
+#endif
+
+/** @brief Driver default configuration.*/
+static const SerialDriverConfig default_config = {
+ UBRR(DEFAULT_USART_BITRATE),
+ (1 << UCSZ1) | (1 << UCSZ0)
+};
+
+/*===========================================================================*/
+/* Low Level Driver local functions. */
+/*===========================================================================*/
+
+static void set_error(uint8_t sra, SerialDriver *sdp) {
+ sdflags_t sts = 0;
+
+ if (sra & (1 << DOR))
+ sts |= SD_OVERRUN_ERROR;
+ if (sra & (1 << UPE))
+ sts |= SD_PARITY_ERROR;
+ if (sra & (1 << FE))
+ sts |= SD_FRAMING_ERROR;
+ chSysLockFromIsr();
+ sdAddFlagsI(sdp, sts);
+ chSysUnlockFromIsr();
+}
+
+#if USE_AVR_USART0 || defined(__DOXYGEN__)
+static void notify1(void) {
+
+ UCSR0B |= (1 << UDRIE);
+}
+
+/**
+ * @brief USART0 initialization.
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void usart0_init(const SerialDriverConfig *config) {
+
+ UBRR0L = config->brr;
+ UBRR0H = config->brr >> 8;
+ UCSR0A = 0;
+ UCSR0B = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);
+ UCSR0C = config->csrc;
+}
+
+/**
+ * @brief USART0 de-initialization.
+ */
+static void usart0_deinit(void) {
+
+ UCSR0A = 0;
+ UCSR0B = 0;
+ UCSR0C = 0;
+}
+#endif
+
+#if USE_AVR_USART1 || defined(__DOXYGEN__)
+static void notify2(void) {
+
+ UCSR1B |= (1 << UDRIE);
+}
+
+/**
+ * @brief USART1 initialization.
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void usart1_init(const SerialDriverConfig *config) {
+
+ UBRR1L = config->brr;
+ UBRR1H = config->brr >> 8;
+ UCSR1A = 0;
+ UCSR1B = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);
+ UCSR1C = config->csrc;
+}
+
+/**
+ * @brief USART1 de-initialization.
+ */
+static void usart1_deinit(void) {
+
+ UCSR1A = 0;
+ UCSR1B = 0;
+ UCSR1C = 0;
+}
+#endif
+
+/*===========================================================================*/
+/* Low Level Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if USE_AVR_USART0 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(USART0_RX_vect) {
+ uint8_t sra;
+
+ CH_IRQ_PROLOGUE();
+
+ sra = UCSR0A;
+ if (sra & ((1 << DOR) | (1 << UPE) | (1 << FE)))
+ set_error(sra, &SD1);
+ chSysLockFromIsr();
+ sdIncomingDataI(&SD1, UDR0);
+ chSysUnlockFromIsr();
+
+ CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(USART0_UDRE_vect) {
+ msg_t b;
+
+ CH_IRQ_PROLOGUE();
+
+ chSysLockFromIsr();
+ b = sdRequestDataI(&SER1);
+ chSysUnlockFromIsr();
+ if (b < Q_OK)
+ UCSR0B &= ~(1 << UDRIE);
+ else
+ UDR0 = b;
+
+ CH_IRQ_EPILOGUE();
+}
+#endif /* USE_AVR_USART0 */
+
+#if USE_AVR_USART1 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(USART1_RX_vect) {
+ uint8_t sra;
+
+ CH_IRQ_PROLOGUE();
+
+ sra = UCSR1A;
+ if (sra & ((1 << DOR) | (1 << UPE) | (1 << FE)))
+ set_error(sra, &SD2);
+ chSysLockFromIsr();
+ sdIncomingDataI(&SD2, UDR1);
+ chSysUnlockFromIsr();
+
+ CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(USART1_UDRE_vect) {
+ msg_t b;
+
+ CH_IRQ_PROLOGUE();
+
+ chSysLockFromIsr();
+ b = sdRequestDataI(&SD2);
+ chSysUnlockFromIsr();
+ if (b < Q_OK)
+ UCSR1B &= ~(1 << UDRIE);
+ else
+ UDR1 = b;
+
+ CH_IRQ_EPILOGUE();
+}
+#endif /* USE_AVR_USART1 */
+
+/*===========================================================================*/
+/* Low Level Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * Low level serial driver initialization. + */
+void sd_lld_init(void) {
+
+#if USE_AVR_USART0
+ sdObjectInit(&SD1, NULL, notify1);
+#endif
+#if USE_AVR_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.
+ */
+void sd_lld_start(SerialDriver *sdp, const SerialDriverConfig *config) {
+
+ if (config == NULL)
+ config = &default_config;
+
+#if USE_AVR_USART0
+ usart0_init(config);
+#endif
+#if USE_AVR_USART1
+ usart1_init(config);
+#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_AVR_USART0
+ usart0_deinit();
+#endif
+#if USE_AVR_USART1
+ usart1_deinit();
+#endif
+}
+
+/** @} */
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