git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1333 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 337 insertions, 0 deletions

diff --git a/os/hal/platforms/LPC214x/serial_lld.c b/os/hal/platforms/LPC214x/serial_lld.c
new file mode 100644
index 000000000..c7db717b2
--- /dev/null
+++ b/os/hal/platforms/LPC214x/serial_lld.c
@@ -0,0 +1,337 @@
+/*

+    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 LPC214x/serial_lld.c

+ * @brief LPC214x low level serial driver code

+ * @addtogroup LPC214x_SERIAL

+ * @{

+ */

+

+#include <ch.h>

+#include <serial.h>

+

+#include "board.h"

+#include "vic.h"

+

+#if USE_LPC214x_UART0 || defined(__DOXYGEN__)

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

+SerialDriver SD1;

+#endif

+

+#if USE_LPC214x_UART1 || defined(__DOXYGEN__)

+/** @brief UART1 serial driver identifier.*/

+SerialDriver SD2;

+#endif

+

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

+static const SerialDriverConfig default_config = {

+  38400,

+  LCR_WL8 | LCR_STOP1 | LCR_NOPARITY,

+  FCR_TRIGGER0

+};

+

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

+/* Low Level Driver local functions.                                         */

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

+

+/**

+ * @brief UART initialization.

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

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

+ */

+static void uart_init(UART *u, const SerialDriverConfig *config) {

+

+  uint32_t div = PCLK / (config->speed << 4);

+  u->UART_LCR = config->lcr | LCR_DLAB;

+  u->UART_DLL = div;

+  u->UART_DLM = div >> 8;

+  u->UART_LCR = config->lcr;

+  u->UART_FCR = FCR_ENABLE | FCR_RXRESET | FCR_TXRESET | config->fcr;

+  u->UART_ACR = 0;

+  u->UART_FDR = 0x10;

+  u->UART_TER = TER_ENABLE;

+  u->UART_IER = IER_RBR | IER_STATUS;

+}

+

+/**

+ * @brief UART de-initialization.

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

+ */

+static void uart_deinit(UART *u) {

+

+  u->UART_DLL = 1;

+  u->UART_DLM = 0;

+  u->UART_FDR = 0x10;

+  u->UART_IER = 0;

+  u->UART_FCR = FCR_RXRESET | FCR_TXRESET;

+  u->UART_LCR = 0;

+  u->UART_ACR = 0;

+  u->UART_TER = TER_ENABLE;

+}

+

+/**

+ * @brief Error handling routine.

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

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

+ */

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

+  sdflags_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();

+  sdAddFlagsI(sdp, sts);

+  chSysUnlockFromIsr();

+}

+

+#if defined(__GNU__)

+__attribute__((noinline))

+#endif

+/**

+ * @brief Common IRQ handler.

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

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

+ * @note Tries hard to clear all the pending interrupt sources, we dont want to

+ *       go through the whole ISR and have another interrupt soon after.

+ */

+static void serve_interrupt(UART *u, SerialDriver *sdp) {

+

+  while (TRUE) {

+

+    switch (u->UART_IIR & IIR_SRC_MASK) {

+    case IIR_SRC_NONE:

+      return;

+    case IIR_SRC_ERROR:

+      set_error(u->UART_LSR, sdp);

+      break;

+    case IIR_SRC_TIMEOUT:

+    case IIR_SRC_RX:

+      while (u->UART_LSR & LSR_RBR_FULL) {

+        chSysLockFromIsr();

+        if (chIQPutI(&sdp->d2.iqueue, u->UART_RBR) < Q_OK)

+           sdAddFlagsI(sdp, SD_OVERRUN_ERROR);

+        chSysUnlockFromIsr();

+      }

+      chSysLockFromIsr();

+      chEvtBroadcastI(&sdp->d1.ievent);

+      chSysUnlockFromIsr();

+      break;

+    case IIR_SRC_TX:

+      {

+#if UART_FIFO_PRELOAD > 0

+        int i = UART_FIFO_PRELOAD;

+        do {

+          chSysLockFromIsr();

+          msg_t b = chOQGetI(&sdp->d2.oqueue);

+          chSysUnlockFromIsr();

+          if (b < Q_OK) {

+            u->UART_IER &= ~IER_THRE;

+            chSysLockFromIsr();

+            chEvtBroadcastI(&sdp->d1.oevent);

+            chSysUnlockFromIsr();

+            break;

+          }

+          u->UART_THR = b;

+        } while (--i);

+#else

+        chSysLockFromIsr();

+        msg_t b = sdRequestDataI(sdp);

+        chSysUnlockFromIsr();

+        if (b < Q_OK)

+          u->UART_IER &= ~IER_THRE;

+        else

+          u->UART_THR = b;

+#endif

+      }

+    default:

+      (void) u->UART_THR;

+      (void) u->UART_RBR;

+    }

+  }

+}

+

+#if UART_FIFO_PRELOAD > 0

+static void preload(UART *u, SerialDriver *sdp) {

+

+  if (u->UART_LSR & LSR_THRE) {

+    int i = UART_FIFO_PRELOAD;

+    do {

+      chSysLockFromIsr();

+      msg_t b = chOQGetI(&sdp->d2.oqueue);

+      chSysUnlockFromIsr();

+      if (b < Q_OK) {

+        chSysLockFromIsr();

+        chEvtBroadcastI(&sdp->d1.oevent);

+        chSysUnlockFromIsr();

+        return;

+      }

+      u->UART_THR = b;

+    } while (--i);

+  }

+  u->UART_IER |= IER_THRE;

+}

+#endif

+

+#if USE_LPC214x_UART0 || defined(__DOXYGEN__)

+static void notify1(void) {

+#if UART_FIFO_PRELOAD > 0

+

+  preload(U0Base, &SD1);

+#else

+  UART *u = U0Base;

+

+  if (u->UART_LSR & LSR_THRE) {

+    chSysLockFromIsr();

+    u->UART_THR = chOQGetI(&SD1.sd_oqueue);

+    chSysUnlockFromIsr();

+  }

+  u->UART_IER |= IER_THRE;

+#endif

+}

+#endif

+

+#if USE_LPC214x_UART1 || defined(__DOXYGEN__)

+static void notify2(void) {

+#if UART_FIFO_PRELOAD > 0

+

+  preload(U1Base, &SD2);

+#else

+  UART *u = U1Base;

+

+  if (u->UART_LSR & LSR_THRE)

+    u->UART_THR = chOQGetI(&SD2.sd_oqueue);

+  u->UART_IER |= IER_THRE;

+#endif

+}

+#endif

+

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

+/* Low Level Driver interrupt handlers.                                      */

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

+

+#if USE_LPC214x_UART0 || defined(__DOXYGEN__)

+CH_IRQ_HANDLER(UART0IrqHandler) {

+

+  CH_IRQ_PROLOGUE();

+

+  serve_interrupt(U0Base, &SD1);

+  VICVectAddr = 0;

+

+  CH_IRQ_EPILOGUE();

+}

+#endif

+

+#if USE_LPC214x_UART1 || defined(__DOXYGEN__)

+CH_IRQ_HANDLER(UART1IrqHandler) {

+

+  CH_IRQ_PROLOGUE();

+

+  serve_interrupt(U1Base, &SD2);

+  VICVectAddr = 0;

+

+  CH_IRQ_EPILOGUE();

+}

+#endif

+

+

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

+/* Low Level Driver exported functions.                                      */

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

+

+/**

+ * Low level serial driver initialization.
+ */

+void sd_lld_init(void) {

+

+#if USE_LPC214x_UART0

+  sdObjectInit(&SD1, NULL, notify1);

+  SetVICVector(UART0IrqHandler, LPC214x_UART1_PRIORITY, SOURCE_UART0);

+#endif

+#if USE_LPC214x_UART1

+  sdObjectInit(&SD2, NULL, notify2);

+  SetVICVector(UART1IrqHandler, LPC214x_UART2_PRIORITY, SOURCE_UART1);

+#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_LPC214x_UART1

+  if (&SD1 == sdp) {

+    PCONP = (PCONP & PCALL) | PCUART0;

+    uart_init(U0Base, config);

+    VICIntEnable = INTMASK(SOURCE_UART0);

+    return;

+  }

+#endif

+#if USE_LPC214x_UART2

+  if (&SD2 == sdp) {

+    PCONP = (PCONP & PCALL) | PCUART1;

+    uart_init(U1Base, config);

+    VICIntEnable = INTMASK(SOURCE_UART1);

+    return;

+  }

+#endif

+}

+

+/**

+ * @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

+ */

+void sd_lld_stop(SerialDriver *sdp) {

+

+#if USE_LPC214x_UART1

+  if (&SD1 == sdp) {

+    uart_deinit(U0Base);

+    PCONP = (PCONP & PCALL) & ~PCUART0;

+    VICIntEnClear = INTMASK(SOURCE_UART0);

+    return;

+  }

+#endif

+#if USE_LPC214x_UART2

+  if (&SD2 == sdp) {

+    uart_deinit(U1Base);

+    PCONP = (PCONP & PCALL) & ~PCUART1;

+    VICIntEnClear = INTMASK(SOURCE_UART1);

+    return;

+  }

+#endif

+}

+

+/** @} */