Add initial serial driver

3 files changed, 327 insertions, 0 deletions

diff --git a/os/hal/ports/NRF51/NRF51822/platform.mk b/os/hal/ports/NRF51/NRF51822/platform.mk
index 4ed0722..c905684 100644
--- a/os/hal/ports/NRF51/NRF51822/platform.mk
+++ b/os/hal/ports/NRF51/NRF51822/platform.mk
@@ -1,6 +1,7 @@
 # List of all the NRF51x platform files.
 PLATFORMSRC = ${CHIBIOS}/os/hal/ports/common/ARMCMx/nvic.c \
               ${CHIBIOS}/community/os/hal/ports/NRF51/NRF51822/hal_lld.c \
+              ${CHIBIOS}/community/os/hal/ports/NRF51/NRF51822/serial_lld.c \
               ${CHIBIOS}/community/os/hal/ports/NRF51/NRF51822/st_lld.c
 
 # Required include directories
diff --git a/os/hal/ports/NRF51/NRF51822/serial_lld.c b/os/hal/ports/NRF51/NRF51822/serial_lld.c
new file mode 100644
index 0000000..c98405d
--- /dev/null
+++ b/os/hal/ports/NRF51/NRF51822/serial_lld.c
@@ -0,0 +1,207 @@
+/*

+    Copyright (C) 2015 Fabio Utzig

+

+    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    serial_lld.c

+ * @brief   NRF51822 serial subsystem low level driver source.

+ *

+ * @addtogroup SERIAL

+ * @{

+ */

+

+#include "hal.h"

+

+#if (HAL_USE_SERIAL == TRUE) || defined(__DOXYGEN__)

+

+#include "nrf51.h"

+

+/*===========================================================================*/

+/* Driver local definitions.                                                 */

+/*===========================================================================*/

+

+/*===========================================================================*/

+/* Driver exported variables.                                                */

+/*===========================================================================*/

+

+/** @brief USART1 serial driver identifier.*/

+#if (NRF51_SERIAL_USE_UART0 == TRUE) || defined(__DOXYGEN__)

+SerialDriver SD1;

+#endif

+

+/*===========================================================================*/

+/* Driver local variables and types.                                         */

+/*===========================================================================*/

+

+/**

+ * @brief   Driver default configuration.

+ */

+static const SerialConfig default_config = {

+  38400

+};

+

+/*===========================================================================*/

+/* Driver local functions.                                                   */

+/*===========================================================================*/

+

+/**

+ * @brief   Driver output notification.

+ */

+#if NRF51_SERIAL_USE_UART0 || defined(__DOXYGEN__)

+static void notify1(io_queue_t *qp)

+{

+  (void)qp;

+

+  //if (NRF_UART0->EVENTS_TXDRDY) {

+    msg_t b = oqGetI(&SD1.oqueue);

+    if (b < Q_OK) {

+      chnAddFlagsI(&SD1, CHN_OUTPUT_EMPTY);

+      return;

+    }

+    NRF_UART0->TXD = b;

+    //NRF_UART0->INTENCLR = 0x80; // clear TX interrupt

+  //}

+}

+#endif

+

+

+/*===========================================================================*/

+/* Driver interrupt handlers.                                                */

+/*===========================================================================*/

+

+#if NRF51_SERIAL_USE_UART0 || defined(__DOXYGEN__)

+OSAL_IRQ_HANDLER(Vector48) {

+

+  OSAL_IRQ_PROLOGUE();

+

+  if (NRF_UART0->EVENTS_RXDRDY) {

+    osalSysLockFromISR();

+    if (iqIsEmptyI(&SD1.iqueue))

+      chnAddFlagsI(&SD1, CHN_INPUT_AVAILABLE);

+    if (iqPutI(&SD1.iqueue, NRF_UART0->RXD) < Q_OK)

+      chnAddFlagsI(&SD1, SD_OVERRUN_ERROR);

+    //NRF_UART0->INTENCLR = 4;

+    osalSysUnlockFromISR();

+  }

+

+  if (NRF_UART0->EVENTS_TXDRDY) {

+    msg_t b;

+

+    osalSysLockFromISR();

+    b = oqGetI(&SD1.oqueue);

+    osalSysUnlockFromISR();

+

+    if (b < Q_OK) {

+      osalSysLockFromISR();

+      chnAddFlagsI(&SD1, CHN_OUTPUT_EMPTY);

+      osalSysUnlockFromISR();

+      NRF_UART0->INTENCLR = 0x80; // clear TX interrupt

+    } else {

+       NRF_UART0->TXD = b;

+    }

+  }

+

+  OSAL_IRQ_EPILOGUE();

+}

+#endif

+

+/*===========================================================================*/

+/* Driver exported functions.                                                */

+/*===========================================================================*/

+

+/**

+ * @brief   Low level serial driver initialization.

+ *

+ * @notapi

+ */

+void sd_lld_init(void) {

+

+#if NRF51_SERIAL_USE_UART0 == TRUE

+  sdObjectInit(&SD1, NULL, notify1);

+#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 (sdp->state == SD_STOP) {

+

+#if NRF51_SERIAL_USE_UART0 == TRUE

+    if (sdp == &SD1) {

+      /* FIXME: some board specific, some hardcodeds! */

+

+      /* Configure PINs */

+      NRF_UART0->PSELRTS = ~0;

+      NRF_UART0->PSELCTS = ~0;

+

+      NRF_GPIO->PIN_CNF[9] = 1;

+      NRF_UART0->PSELTXD = 9;

+      NRF_UART0->PSELRXD = 11;

+

+      /* 38400!!! */

+      NRF_UART0->BAUDRATE = 0x009D5000;

+

+      /* Enable interrupts for RX, TX and ERROR */

+      NRF_UART0->INTENSET = 0x284;

+

+      nvicEnableVector(UART0_IRQn, 12);

+

+      NRF_UART0->ENABLE = 4;

+      NRF_UART0->TASKS_STARTRX = 1;

+      NRF_UART0->TASKS_STARTTX = 1;

+    }

+#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 (sdp->state == SD_READY) {

+

+#if NRF51_SERIAL_USE_UART0 == TRUE

+    if (&SD1 == sdp) {

+      nvicDisableVector(UART0_IRQn);

+    }

+#endif

+

+  }

+}

+

+#endif /* HAL_USE_SERIAL == TRUE */

+

+/** @} */

diff --git a/os/hal/ports/NRF51/NRF51822/serial_lld.h b/os/hal/ports/NRF51/NRF51822/serial_lld.h
new file mode 100644
index 0000000..ae8e46e
--- /dev/null
+++ b/os/hal/ports/NRF51/NRF51822/serial_lld.h
@@ -0,0 +1,119 @@
+/*

+    Copyright (C) 2015 Fabio Utzig

+

+    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    serial_lld.h

+ * @brief   NRF51822 serial subsystem low level driver header.

+ *

+ * @addtogroup SERIAL

+ * @{

+ */

+

+#ifndef _SERIAL_LLD_H_

+#define _SERIAL_LLD_H_

+

+#if (HAL_USE_SERIAL == TRUE) || defined(__DOXYGEN__)

+

+/*===========================================================================*/

+/* Driver constants.                                                         */

+/*===========================================================================*/

+

+/*===========================================================================*/

+/* Driver pre-compile time settings.                                         */

+/*===========================================================================*/

+

+/**

+ * @name    PLATFORM configuration options

+ * @{

+ */

+/**

+ * @brief   USART1 driver enable switch.

+ * @details If set to @p TRUE the support for USART1 is included.

+ * @note    The default is @p FALSE.

+ */

+#if !defined(NRF51_SERIAL_USE_UART0) || defined(__DOXYGEN__)

+#define NRF51_SERIAL_USE_UART0             FALSE

+#endif

+/** @} */

+

+/*===========================================================================*/

+/* Derived constants and error checks.                                       */

+/*===========================================================================*/

+

+/*===========================================================================*/

+/* Driver data structures and types.                                         */

+/*===========================================================================*/

+

+/**

+ * @brief   NRF51 Serial Driver configuration structure.

+ * @details An instance of this structure must be passed to @p sdStart()

+ *          in order to configure and start a serial driver operations.

+ * @note    This structure content is architecture dependent, each driver

+ *          implementation defines its own version and the custom static

+ *          initializers.

+ */

+typedef struct {

+  /**

+   * @brief Bit rate.

+   */

+  uint32_t                  speed;

+  /* End of the mandatory fields.*/

+} SerialConfig;

+

+/**

+ * @brief   @p SerialDriver specific data.

+ */

+#define _serial_driver_data                                                 \

+  _base_asynchronous_channel_data                                           \

+  /* Driver state.*/                                                        \

+  sdstate_t                 state;                                          \

+  /* Input queue.*/                                                         \

+  input_queue_t             iqueue;                                         \

+  /* Output queue.*/                                                        \

+  output_queue_t            oqueue;                                         \

+  /* Input circular buffer.*/                                               \

+  uint8_t                   ib[SERIAL_BUFFERS_SIZE];                        \

+  /* Output circular buffer.*/                                              \

+  uint8_t                   ob[SERIAL_BUFFERS_SIZE];                        \

+  /* End of the mandatory fields.*/

+

+/*===========================================================================*/

+/* Driver macros.                                                            */

+/*===========================================================================*/

+

+/*===========================================================================*/

+/* External declarations.                                                    */

+/*===========================================================================*/

+

+#if (NRF51_SERIAL_USE_UART0 == TRUE) && !defined(__DOXYGEN__)

+extern SerialDriver SD1;

+#endif

+

+#ifdef __cplusplus

+extern "C" {

+#endif

+  void sd_lld_init(void);

+  void sd_lld_start(SerialDriver *sdp, const SerialConfig *config);

+  void sd_lld_stop(SerialDriver *sdp);

+#ifdef __cplusplus

+}

+#endif

+

+#endif /* HAL_USE_SERIAL == TRUE */

+

+#endif /* _SERIAL_LLD_H_ */

+

+/** @} */