LPC11xx HAL and Serial improvements, untested SPI driver added.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2281 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 376 insertions, 0 deletions

diff --git a/os/hal/platforms/LPC11xx/spi_lld.c b/os/hal/platforms/LPC11xx/spi_lld.c
new file mode 100644
index 000000000..b27d71ed0
--- /dev/null
+++ b/os/hal/platforms/LPC11xx/spi_lld.c
@@ -0,0 +1,376 @@
+/*

+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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    LPC11xx/spi_lld.c

+ * @brief   LPC11xx low level SPI driver code.

+ *

+ * @addtogroup LPC11xx_SPI

+ * @{

+ */

+

+#include "ch.h"

+#include "hal.h"

+

+#if LPC11xx_SPI_USE_SSP0 || defined(__DOXYGEN__)

+

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

+/* Driver exported variables.                                                */

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

+

+#if LPC11xx_SPI_USE_SSP0 || defined(__DOXYGEN__)

+/** @brief SPI1 driver identifier.*/

+SPIDriver SPID1;

+#endif

+

+#if LPC11xx_SPI_USE_SSP1 || defined(__DOXYGEN__)

+/** @brief SPI2 driver identifier.*/

+SPIDriver SPID2;

+#endif

+

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

+/* Driver local variables.                                                   */

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

+

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

+/* Driver local functions.                                                   */

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

+

+/**

+ * @brief   Preloads the transmit FIFO.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ */

+static void ssp_fifo_preload(SPIDriver *spip) {

+  LPC_SSP_TypeDef *ssp = spip->spd_ssp;

+  uint32_t n = spip->spd_txcnt > LPC11xx_SSP_FIFO_DEPTH ?

+               LPC11xx_SSP_FIFO_DEPTH : spip->spd_txcnt;

+

+  while(((ssp->SR & SR_TNF) != 0) && (n > 0)) {

+    if (spip->spd_txptr != NULL) {

+      if ((ssp->CR0 & CR0_DSSMASK) > CR0_DSS8BIT)

+        ssp->DR = *(uint16_t *)spip->spd_txptr++;

+      else

+        ssp->DR = *(uint8_t *)spip->spd_txptr++;

+    }

+    else

+      ssp->DR = 0xFFFFFFFF;

+    n--;

+    spip->spd_txcnt--;

+  }

+}

+

+/**

+ * @brief   Common IRQ handler.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ */

+static void serve_interrupt(SPIDriver *spip) {

+  LPC_SSP_TypeDef *ssp = spip->spd_ssp;

+

+  if ((ssp->MIS & MIS_ROR) != 0) {

+    /* The overflow condition should never happen because priority is given

+       to receive but a hook macro is provided anyway...*/

+    LPC11xx_SPI_SSP_ERROR_HOOK(spip);

+  }

+  ssp->ICR = ICR_RT | ICR_ROR;

+  while ((ssp->SR & SR_RNE) != 0) {

+    if (spip->spd_rxptr != NULL) {

+      if ((ssp->CR0 & CR0_DSSMASK) > CR0_DSS8BIT)

+        *(uint16_t *)spip->spd_rxptr++ = ssp->DR;

+      else

+        *(uint8_t *)spip->spd_rxptr++ = ssp->DR;

+    }

+    else

+      (void)ssp->DR;

+    if (--spip->spd_rxcnt == 0) {

+      chDbgAssert(spip->spd_txcnt == 0,

+                  "chSemResetI(), #1", "counter out of synch");

+      /* Stops the IRQ sources.*/

+      ssp->IMSC = 0;

+      /* Portable SPI ISR code defined in the high level driver, note, it is

+         a macro.*/

+      _spi_isr_code(spip);

+      return;

+    }

+  }

+  ssp_fifo_preload(spip);

+  if (spip->spd_txcnt == 0)

+    ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_RX;

+}

+

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

+/* Driver interrupt handlers.                                                */

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

+

+#if LPC11xx_SPI_USE_SSP0 || defined(__DOXYGEN__)

+/**

+ * @brief   SSP0 interrupt handler.

+ *

+ * @isr

+ */

+CH_IRQ_HANDLER(Vector90) {

+

+  CH_IRQ_PROLOGUE();

+

+  serve_interrupt(&SPID1);

+

+  CH_IRQ_EPILOGUE();

+}

+#endif

+

+#if LPC11xx_SPI_USE_SSP1 || defined(__DOXYGEN__)

+/**

+ * @brief   SSP1 interrupt handler.

+ *

+ * @isr

+ */

+CH_IRQ_HANDLER(Vector78) {

+

+  CH_IRQ_PROLOGUE();

+

+  serve_interrupt(&SPID2);

+

+  CH_IRQ_EPILOGUE();

+}

+#endif

+

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

+/* Driver exported functions.                                                */

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

+

+/**

+ * @brief   Low level SPI driver initialization.

+ *

+ * @notapi

+ */

+void spi_lld_init(void) {

+

+#if LPC11xx_SPI_USE_SSP0

+  spiObjectInit(&SPID1);

+  SPID1.spd_ssp = LPC_SSP0;

+  LPC_IOCON->SCK_LOC = LPC11xx_SPI_SCK0_SELECTOR;

+#if LPC11xx_SPI_SCK0_SELECTOR == SCK0_IS_PIO0_10

+  LPC_IOCON->JTAG_TCK_PIO0_10 = 0xC2;       /* SCK0 without resistors.      */

+#elif LPC11xx_SPI_SCK0_SELECTOR == SCK0_IS_PIO2_11

+  LPC_IOCON->PIO2_11 = 0xC1;                /* SCK0 without resistors.      */

+#else /* LPC11xx_SPI_SCK0_SELECTOR == SCK0_IS_PIO0_6 */

+  LPC_IOCON->PIO0_6  = 0xC2;                /* SCK0 without resistors.      */

+#endif

+  LPC_IOCON->PIO0_8  = 0xC1;                /* MISO0 without resistors.     */

+  LPC_IOCON->PIO0_9  = 0xC1;                /* MOSI0 without resistors.     */

+#endif /* LPC11xx_SPI_USE_SSP0 */

+

+#if LPC11xx_SPI_USE_SSP1

+  spiObjectInit(&SPID2);

+  SPID2.spd_ssp = LPC_SSP1;

+  LPC_IOCON->PIO2_1  = 0xC2;                /* SCK1 without resistors.      */

+  LPC_IOCON->PIO2_2  = 0xC2;                /* MISO1 without resistors.     */

+  LPC_IOCON->PIO2_3  = 0xC2;                /* MOSI1 without resistors.     */

+#endif /* LPC11xx_SPI_USE_SSP0 */

+}

+

+/**

+ * @brief   Configures and activates the SPI peripheral.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ *

+ * @notapi

+ */

+void spi_lld_start(SPIDriver *spip) {

+

+  if (spip->spd_state == SPI_STOP) {

+    /* Clock activation.*/

+#if LPC11xx_SPI_USE_SSP0

+    if (&SPID1 == spip) {

+      LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 11);

+      LPC_SYSCON->SSP0CLKDIV = LPC11xx_SPI_SSP0CLKDIV;

+      NVICEnableVector(SSP0_IRQn,

+                       CORTEX_PRIORITY_MASK(LPC11xx_SPI_SSP0_IRQ_PRIORITY));

+    }

+#endif

+#if LPC11xx_SPI_USE_SSP1

+    if (&SPID2 == spip) {

+      LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 18);

+      LPC_SYSCON->SSP1CLKDIV = LPC11xx_SPI_SSP1CLKDIV;

+      NVICEnableVector(SSP1_IRQn,

+                       CORTEX_PRIORITY_MASK(LPC11xx_SPI_SSP1_IRQ_PRIORITY));

+    }

+#endif

+  }

+  /* Configuration.*/

+  spip->spd_ssp->CR1  = 0;

+  /* Emptying the receive FIFO, it happens to not be empty while debugging.*/

+  while (spip->spd_ssp->SR & SR_RNE)

+    (void) spip->spd_ssp->DR;

+  spip->spd_ssp->ICR  = ICR_RT | ICR_ROR;

+  spip->spd_ssp->CR0  = spip->spd_config->spc_cr0;

+  spip->spd_ssp->CPSR = spip->spd_config->spc_cpsr;

+  spip->spd_ssp->CR1  = spip->spd_config->spc_cr1 | CR1_SSE;

+}

+

+/**

+ * @brief   Deactivates the SPI peripheral.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ *

+ * @notapi

+ */

+void spi_lld_stop(SPIDriver *spip) {

+

+  if (spip->spd_state != SPI_STOP) {

+#if LPC11xx_SPI_USE_SSP0

+    if (&SPID1 == spip) {

+      LPC_SYSCON->SSP0CLKDIV = 0;

+      LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 11);

+      NVICDisableVector(SSP0_IRQn);

+      return;

+    }

+#endif

+#if LPC11xx_SPI_USE_SSP1

+    if (&SPID2 == spip) {

+      LPC_SYSCON->SSP1CLKDIV = 0;

+      LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 18);

+      NVICDisableVector(SSP1_IRQn);

+      return;

+    }

+#endif

+    spip->spd_ssp->CR1  = 0;

+    spip->spd_ssp->CR0  = 0;

+    spip->spd_ssp->CPSR = 0;

+  }

+}

+

+/**

+ * @brief   Asserts the slave select signal and prepares for transfers.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ *

+ * @notapi

+ */

+void spi_lld_select(SPIDriver *spip) {

+

+  palClearPad(spip->spd_config->spc_ssport, spip->spd_config->spc_sspad);

+}

+

+/**

+ * @brief   Deasserts the slave select signal.

+ * @details The previously selected peripheral is unselected.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ *

+ * @notapi

+ */

+void spi_lld_unselect(SPIDriver *spip) {

+

+  palSetPad(spip->spd_config->spc_ssport, spip->spd_config->spc_sspad);

+}

+

+/**

+ * @brief   Ignores data on the SPI bus.

+ * @details This function transmits a series of idle words on the SPI bus and

+ *          ignores the received data. This function can be invoked even

+ *          when a slave select signal has not been yet asserted.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ * @param[in] n         number of words to be ignored

+ *

+ * @notapi

+ */

+void spi_lld_ignore(SPIDriver *spip, size_t n) {

+

+  spip->spd_rxptr = NULL;

+  spip->spd_txptr = NULL;

+  spip->spd_rxcnt = spip->spd_txcnt = n;

+  ssp_fifo_preload(spip);

+  spip->spd_ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;

+}

+

+/**

+ * @brief   Exchanges data on the SPI bus.

+ * @details This asynchronous function starts a simultaneous transmit/receive

+ *          operation.

+ * @post    At the end of the operation the configured callback is invoked.

+ * @note    The buffers are organized as uint8_t arrays for data sizes below or

+ *          equal to 8 bits else it is organized as uint16_t arrays.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ * @param[in] n         number of words to be exchanged

+ * @param[in] txbuf     the pointer to the transmit buffer

+ * @param[out] rxbuf    the pointer to the receive buffer

+ *

+ * @notapi

+ */

+void spi_lld_exchange(SPIDriver *spip, size_t n,

+                      const void *txbuf, void *rxbuf) {

+

+  spip->spd_rxptr = rxbuf;

+  spip->spd_txptr = txbuf;

+  spip->spd_rxcnt = spip->spd_txcnt = n;

+  ssp_fifo_preload(spip);

+  spip->spd_ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;

+}

+

+/**

+ * @brief   Sends data over the SPI bus.

+ * @details This asynchronous function starts a transmit operation.

+ * @post    At the end of the operation the configured callback is invoked.

+ * @note    The buffers are organized as uint8_t arrays for data sizes below or

+ *          equal to 8 bits else it is organized as uint16_t arrays.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ * @param[in] n         number of words to send

+ * @param[in] txbuf     the pointer to the transmit buffer

+ *

+ * @notapi

+ */

+void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {

+

+  spip->spd_rxptr = NULL;

+  spip->spd_txptr = txbuf;

+  spip->spd_rxcnt = spip->spd_txcnt = n;

+  ssp_fifo_preload(spip);

+  spip->spd_ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;

+}

+

+/**

+ * @brief   Receives data from the SPI bus.

+ * @details This asynchronous function starts a receive operation.

+ * @post    At the end of the operation the configured callback is invoked.

+ * @note    The buffers are organized as uint8_t arrays for data sizes below or

+ *          equal to 8 bits else it is organized as uint16_t arrays.

+ *

+ * @param[in] spip      pointer to the @p SPIDriver object

+ * @param[in] n         number of words to receive

+ * @param[out] rxbuf    the pointer to the receive buffer

+ *

+ * @notapi

+ */

+void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {

+

+  spip->spd_rxptr = rxbuf;

+  spip->spd_txptr = NULL;

+  spip->spd_rxcnt = spip->spd_txcnt = n;

+  ssp_fifo_preload(spip);

+  spip->spd_ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;

+}

+

+#endif /* CH_HAL_USE_SPI */

+

+/** @} */