git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1104 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 256 insertions, 0 deletions

diff --git a/os/io/platforms/AVR/serial_lld.c b/os/io/platforms/AVR/serial_lld.c
new file mode 100644
index 000000000..e0e711242
--- /dev/null
+++ b/os/io/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 templates/serial_lld.c

+ * @brief Serial Driver subsystem low level driver source template

+ * @addtogroup SERIAL_LLD

+ * @{

+ */

+

+#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) {

+  dflags_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

+ */

+void usart0_init(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.

+ */

+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

+ */

+void usart1_init(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.

+ */

+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, &SER1);

+  chSysLockFromIsr();

+  sdIncomingDataI(&SER1, 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, &SER2);

+  chSysLockFromIsr();

+  sdIncomingDataI(&SER2, UDR1);

+  chSysUnlockFromIsr();

+

+  CH_IRQ_EPILOGUE();

+}

+

+CH_IRQ_HANDLER(USART1_UDRE_vect) {

+  msg_t b;

+

+  CH_IRQ_PROLOGUE();

+

+  chSysLockFromIsr();

+  b = sdRequestDataI(&SER2);

+  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_MSP430_USART0

+  sdObjectInit(&COM1, NULL, notify1);

+#endif

+#if USE_MSP430_USART1

+  sdObjectInit(&COM2, 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

+}

+

+/** @} */