git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4223 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 302 insertions, 0 deletions

diff --git a/os/hal/platforms/LPC11Uxx/serial_lld.c b/os/hal/platforms/LPC11Uxx/serial_lld.c
new file mode 100644
index 000000000..afe371238
--- /dev/null
+++ b/os/hal/platforms/LPC11Uxx/serial_lld.c
@@ -0,0 +1,302 @@
+/*

+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,

+                 2011,2012 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    LPC11Uxx/serial_lld.c

+ * @brief   LPC11Uxx low level serial driver code.

+ *

+ * @addtogroup SERIAL

+ * @{

+ */

+

+#include "ch.h"

+#include "hal.h"

+

+#if HAL_USE_SERIAL || defined(__DOXYGEN__)

+

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

+/* Driver exported variables.                                                */

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

+

+#if LPC_SERIAL_USE_UART0 || defined(__DOXYGEN__)

+/** @brief UART0 serial driver identifier.*/

+SerialDriver SD1;

+#endif

+

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

+/* Driver local variables.                                                   */

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

+

+/** @brief Driver default configuration.*/

+static const SerialConfig default_config = {

+  SERIAL_DEFAULT_BITRATE,

+  LCR_WL8 | LCR_STOP1 | LCR_NOPARITY,

+  FCR_TRIGGER0

+};

+

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

+/* Driver local functions.                                                   */

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

+

+/**

+ * @brief   UART initialization.

+ *

+ * @param[in] sdp       communication channel associated to the UART

+ * @param[in] config    the architecture-dependent serial driver configuration

+ */

+static void uart_init(SerialDriver *sdp, const SerialConfig *config) {

+  LPC_UART_TypeDef *u = sdp->uart;

+

+  uint32_t div = LPC_SERIAL_UART0_PCLK / (config->sc_speed << 4);

+  u->LCR = config->sc_lcr | LCR_DLAB;

+  u->DLL = div;

+  u->DLM = div >> 8;

+  u->LCR = config->sc_lcr;

+  u->FCR = FCR_ENABLE | FCR_RXRESET | FCR_TXRESET | config->sc_fcr;

+  u->ACR = 0;

+  u->FDR = 0x10;

+  u->TER = TER_ENABLE;

+  u->IER = IER_RBR | IER_STATUS;

+}

+

+/**

+ * @brief   UART de-initialization.

+ *

+ * @param[in] u         pointer to an UART I/O block

+ */

+static void uart_deinit(LPC_UART_TypeDef *u) {

+

+  u->LCR = LCR_DLAB;

+  u->DLL = 1;

+  u->DLM = 0;

+  u->LCR = 0;

+  u->FDR = 0x10;

+  u->IER = 0;

+  u->FCR = FCR_RXRESET | FCR_TXRESET;

+  u->ACR = 0;

+  u->TER = TER_ENABLE;

+}

+

+/**

+ * @brief   Error handling routine.

+ *

+ * @param[in] sdp       communication channel associated to the UART

+ * @param[in] err       UART LSR register value

+ */

+static void set_error(SerialDriver *sdp, IOREG32 err) {

+  chnflags_t sts = 0;

+

+  if (err & LSR_OVERRUN)

+    sts |= SD_OVERRUN_ERROR;

+  if (err & LSR_PARITY)

+    sts |= SD_PARITY_ERROR;

+  if (err & LSR_FRAMING)

+    sts |= SD_FRAMING_ERROR;

+  if (err & LSR_BREAK)

+    sts |= SD_BREAK_DETECTED;

+  chSysLockFromIsr();

+  chnAddFlagsI(sdp, sts);

+  chSysUnlockFromIsr();

+}

+

+/**

+ * @brief   Common IRQ handler.

+ * @note    Tries hard to clear all the pending interrupt sources, we don't

+ *          want to go through the whole ISR and have another interrupt soon

+ *          after.

+ *

+ * @param[in] u         pointer to an UART I/O block

+ * @param[in] sdp       communication channel associated to the UART

+ */

+static void serve_interrupt(SerialDriver *sdp) {

+  LPC_UART_TypeDef *u = sdp->uart;

+

+  while (TRUE) {

+    switch (u->IIR & IIR_SRC_MASK) {

+    case IIR_SRC_NONE:

+      return;

+    case IIR_SRC_ERROR:

+      set_error(sdp, u->LSR);

+      break;

+    case IIR_SRC_TIMEOUT:

+    case IIR_SRC_RX:

+      chSysLockFromIsr();

+      if (chIQIsEmptyI(&sdp->iqueue))

+        chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);

+      chSysUnlockFromIsr();

+      while (u->LSR & LSR_RBR_FULL) {

+        chSysLockFromIsr();

+        if (chIQPutI(&sdp->iqueue, u->RBR) < Q_OK)

+          chnAddFlagsI(sdp, SD_OVERRUN_ERROR);

+        chSysUnlockFromIsr();

+      }

+      break;

+    case IIR_SRC_TX:

+      {

+        int i = LPC_SERIAL_FIFO_PRELOAD;

+        do {

+          msg_t b;

+

+          chSysLockFromIsr();

+          b = chOQGetI(&sdp->oqueue);

+          chSysUnlockFromIsr();

+          if (b < Q_OK) {

+            u->IER &= ~IER_THRE;

+            chSysLockFromIsr();

+            chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);

+            chSysUnlockFromIsr();

+            break;

+          }

+          u->THR = b;

+        } while (--i);

+      }

+      break;

+    default:

+      (void) u->THR;

+      (void) u->RBR;

+    }

+  }

+}

+

+/**

+ * @brief   Attempts a TX FIFO preload.

+ */

+static void preload(SerialDriver *sdp) {

+  LPC_UART_TypeDef *u = sdp->uart;

+

+  if (u->LSR & LSR_THRE) {

+    int i = LPC_SERIAL_FIFO_PRELOAD;

+    do {

+      msg_t b = chOQGetI(&sdp->oqueue);

+      if (b < Q_OK) {

+        chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);

+        return;

+      }

+      u->THR = b;

+    } while (--i);

+  }

+  u->IER |= IER_THRE;

+}

+

+/**

+ * @brief   Driver SD1 output notification.

+ */

+#if LPC_SERIAL_USE_UART0 || defined(__DOXYGEN__)

+static void notify1(GenericQueue *qp) {

+

+  (void)qp;

+  preload(&SD1);

+}

+#endif

+

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

+/* Driver interrupt handlers.                                                */

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

+

+/**

+ * @brief   UART0 IRQ handler.

+ *

+ * @isr

+ */

+#if LPC_SERIAL_USE_UART0 || defined(__DOXYGEN__)

+CH_IRQ_HANDLER(Vector94) {

+

+  CH_IRQ_PROLOGUE();

+

+  serve_interrupt(&SD1);

+

+  CH_IRQ_EPILOGUE();

+}

+#endif

+

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

+/* Driver exported functions.                                                */

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

+

+/**

+ * @brief   Low level serial driver initialization.

+ *

+ * @notapi

+ */

+void sd_lld_init(void) {

+

+#if LPC_SERIAL_USE_UART0

+  sdObjectInit(&SD1, NULL, notify1);

+  SD1.uart = LPC_UART;

+  LPC_IOCON->PIO1_6 = 0xC1;                 /* RDX without resistors.       */

+  LPC_IOCON->PIO1_7 = 0xC1;                 /* TDX without resistors.       */

+#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 LPC_SERIAL_USE_UART0

+    if (&SD1 == sdp) {

+      LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 12);

+      LPC_SYSCON->UARTCLKDIV = LPC_SERIAL_UART0CLKDIV;

+      nvicEnableVector(UART_IRQn,

+                       CORTEX_PRIORITY_MASK(LPC_SERIAL_UART0_IRQ_PRIORITY));

+    }

+#endif

+  }

+  uart_init(sdp, config);

+}

+

+/**

+ * @brief   Low level serial driver stop.

+ * @details De-initializes the UART, 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) {

+    uart_deinit(sdp->uart);

+#if LPC_SERIAL_USE_UART0

+    if (&SD1 == sdp) {

+      LPC_SYSCON->UARTCLKDIV = 0;

+      LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 12);

+      nvicDisableVector(UART_IRQn);

+      return;

+    }

+#endif

+  }

+}

+

+#endif /* HAL_USE_SERIAL */

+

+/** @} */