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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-08-09 08:25:09 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-08-09 08:25:09 +0000 |
| commit | 0e34cd051ed686263001af3a721f6858db94d072 (patch) | |
| tree | 499c397f624dff297b4a5cf11e783f30cc6ae4b3 /os/hal/src/spi.c | |
| parent | 8ca210a4af9fd039e290cfcc309adde543999c1f (diff) | |
| download | ChibiOS-0e34cd051ed686263001af3a721f6858db94d072.tar.gz ChibiOS-0e34cd051ed686263001af3a721f6858db94d072.tar.bz2 ChibiOS-0e34cd051ed686263001af3a721f6858db94d072.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/kernel_3_dev@6109 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/src/spi.c')
| -rw-r--r-- | os/hal/src/spi.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/os/hal/src/spi.c b/os/hal/src/spi.c new file mode 100644 index 000000000..cd7124bd3 --- /dev/null +++ b/os/hal/src/spi.c @@ -0,0 +1,428 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011,2012,2013 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 spi.c
+ * @brief SPI Driver code.
+ *
+ * @addtogroup SPI
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_SPI || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief SPI Driver initialization.
+ * @note This function is implicitly invoked by @p halInit(), there is
+ * no need to explicitly initialize the driver.
+ *
+ * @init
+ */
+void spiInit(void) {
+
+ spi_lld_init();
+}
+
+/**
+ * @brief Initializes the standard part of a @p SPIDriver structure.
+ *
+ * @param[out] spip pointer to the @p SPIDriver object
+ *
+ * @init
+ */
+void spiObjectInit(SPIDriver *spip) {
+
+ spip->state = SPI_STOP;
+ spip->config = NULL;
+#if SPI_USE_WAIT
+ spip->thread = NULL;
+#endif /* SPI_USE_WAIT */
+#if SPI_USE_MUTUAL_EXCLUSION
+ osalMutexObjectInit(&spip->mutex);
+#endif /* SPI_USE_MUTUAL_EXCLUSION */
+#if defined(SPI_DRIVER_EXT_INIT_HOOK)
+ SPI_DRIVER_EXT_INIT_HOOK(spip);
+#endif
+}
+
+/**
+ * @brief Configures and activates the SPI peripheral.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ * @param[in] config pointer to the @p SPIConfig object
+ *
+ * @api
+ */
+void spiStart(SPIDriver *spip, const SPIConfig *config) {
+
+ osalDbgCheck((spip != NULL) && (config != NULL));
+
+ osalSysLock();
+ osalDbgAssert((spip->state == SPI_STOP) || (spip->state == SPI_READY),
+ "spiStart(), #1", "invalid state");
+ spip->config = config;
+ spi_lld_start(spip);
+ spip->state = SPI_READY;
+ osalSysUnlock();
+}
+
+/**
+ * @brief Deactivates the SPI peripheral.
+ * @note Deactivating the peripheral also enforces a release of the slave
+ * select line.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @api
+ */
+void spiStop(SPIDriver *spip) {
+
+ osalDbgCheck(spip != NULL);
+
+ osalSysLock();
+ osalDbgAssert((spip->state == SPI_STOP) || (spip->state == SPI_READY),
+ "spiStop(), #1", "invalid state");
+ spi_lld_stop(spip);
+ spip->state = SPI_STOP;
+ osalSysUnlock();
+}
+
+/**
+ * @brief Asserts the slave select signal and prepares for transfers.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @api
+ */
+void spiSelect(SPIDriver *spip) {
+
+ osalDbgCheck(spip != NULL);
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY, "spiSelect(), #1", "not ready");
+ spiSelectI(spip);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Deasserts the slave select signal.
+ * @details The previously selected peripheral is unselected.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @api
+ */
+void spiUnselect(SPIDriver *spip) {
+
+ osalDbgCheck(spip != NULL);
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY, "spiUnselect(), #1", "not ready");
+ spiUnselectI(spip);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Ignores data on the SPI bus.
+ * @details This asynchronous function starts the transmission of a series of
+ * idle words on the SPI bus and ignores the received data.
+ * @pre A slave must have been selected using @p spiSelect() or
+ * @p spiSelectI().
+ * @post At the end of the operation the configured callback is invoked.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ * @param[in] n number of words to be ignored
+ *
+ * @api
+ */
+void spiStartIgnore(SPIDriver *spip, size_t n) {
+
+ osalDbgCheck((spip != NULL) && (n > 0));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY, "spiStartIgnore(), #1", "not ready");
+ spiStartIgnoreI(spip, n);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Exchanges data on the SPI bus.
+ * @details This asynchronous function starts a simultaneous transmit/receive
+ * operation.
+ * @pre A slave must have been selected using @p spiSelect() or
+ * @p spiSelectI().
+ * @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
+ *
+ * @api
+ */
+void spiStartExchange(SPIDriver *spip, size_t n,
+ const void *txbuf, void *rxbuf) {
+
+ osalDbgCheck((spip != NULL) && (n > 0) && (rxbuf != NULL) && (txbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY,
+ "spiStartExchange(), #1", "not ready");
+ spiStartExchangeI(spip, n, txbuf, rxbuf);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Sends data over the SPI bus.
+ * @details This asynchronous function starts a transmit operation.
+ * @pre A slave must have been selected using @p spiSelect() or
+ * @p spiSelectI().
+ * @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
+ *
+ * @api
+ */
+void spiStartSend(SPIDriver *spip, size_t n, const void *txbuf) {
+
+ osalDbgCheck((spip != NULL) && (n > 0) && (txbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY, "spiStartSend(), #1", "not ready");
+ spiStartSendI(spip, n, txbuf);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Receives data from the SPI bus.
+ * @details This asynchronous function starts a receive operation.
+ * @pre A slave must have been selected using @p spiSelect() or
+ * @p spiSelectI().
+ * @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
+ *
+ * @api
+ */
+void spiStartReceive(SPIDriver *spip, size_t n, void *rxbuf) {
+
+ osalDbgCheck((spip != NULL) && (n > 0) && (rxbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY,
+ "spiStartReceive(), #1", "not ready");
+ spiStartReceiveI(spip, n, rxbuf);
+ osalSysUnlock();
+}
+
+#if SPI_USE_WAIT || defined(__DOXYGEN__)
+/**
+ * @brief Ignores data on the SPI bus.
+ * @details This synchronous function performs the transmission of a series of
+ * idle words on the SPI bus and ignores the received data.
+ * @pre In order to use this function the option @p SPI_USE_WAIT must be
+ * enabled.
+ * @pre In order to use this function the driver must have been configured
+ * without callbacks (@p end_cb = @p NULL).
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ * @param[in] n number of words to be ignored
+ *
+ * @api
+ */
+void spiIgnore(SPIDriver *spip, size_t n) {
+
+ osalDbgCheck((spip != NULL) && (n > 0));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY,
+ "spiIgnore(), #1", "not ready");
+ osalDbgAssert(spip->config->end_cb == NULL,
+ "spiIgnore(), #2", "has callback");
+ spiStartIgnoreI(spip, n);
+ _spi_wait_s(spip);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Exchanges data on the SPI bus.
+ * @details This synchronous function performs a simultaneous transmit/receive
+ * operation.
+ * @pre In order to use this function the option @p SPI_USE_WAIT must be
+ * enabled.
+ * @pre In order to use this function the driver must have been configured
+ * without callbacks (@p end_cb = @p NULL).
+ * @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
+ *
+ * @api
+ */
+void spiExchange(SPIDriver *spip, size_t n,
+ const void *txbuf, void *rxbuf) {
+
+ osalDbgCheck((spip != NULL) && (n > 0) &&
+ (rxbuf != NULL) && (txbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY, "spiExchange(), #1", "not ready");
+ osalDbgAssert(spip->config->end_cb == NULL,
+ "spiExchange(), #2", "has callback");
+ spiStartExchangeI(spip, n, txbuf, rxbuf);
+ _spi_wait_s(spip);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Sends data over the SPI bus.
+ * @details This synchronous function performs a transmit operation.
+ * @pre In order to use this function the option @p SPI_USE_WAIT must be
+ * enabled.
+ * @pre In order to use this function the driver must have been configured
+ * without callbacks (@p end_cb = @p NULL).
+ * @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
+ *
+ * @api
+ */
+void spiSend(SPIDriver *spip, size_t n, const void *txbuf) {
+
+ osalDbgCheck((spip != NULL) && (n > 0) && (txbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY,
+ "spiSend(), #1", "not ready");
+ osalDbgAssert(spip->config->end_cb == NULL,
+ "spiSend(), #2", "has callback");
+ spiStartSendI(spip, n, txbuf);
+ _spi_wait_s(spip);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Receives data from the SPI bus.
+ * @details This synchronous function performs a receive operation.
+ * @pre In order to use this function the option @p SPI_USE_WAIT must be
+ * enabled.
+ * @pre In order to use this function the driver must have been configured
+ * without callbacks (@p end_cb = @p NULL).
+ * @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
+ *
+ * @api
+ */
+void spiReceive(SPIDriver *spip, size_t n, void *rxbuf) {
+
+ osalDbgCheck((spip != NULL) && (n > 0) && (rxbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(spip->state == SPI_READY,
+ "spiReceive(), #1", "not ready");
+ osalDbgAssert(spip->config->end_cb == NULL,
+ "spiReceive(), #2", "has callback");
+ spiStartReceiveI(spip, n, rxbuf);
+ _spi_wait_s(spip);
+ osalSysUnlock();
+}
+#endif /* SPI_USE_WAIT */
+
+#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
+/**
+ * @brief Gains exclusive access to the SPI bus.
+ * @details This function tries to gain ownership to the SPI bus, if the bus
+ * is already being used then the invoking thread is queued.
+ * @pre In order to use this function the option @p SPI_USE_MUTUAL_EXCLUSION
+ * must be enabled.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @api
+ */
+void spiAcquireBus(SPIDriver *spip) {
+
+ osalDbgCheck(spip != NULL);
+
+ osalMutexLock(&spip->mutex);
+}
+
+/**
+ * @brief Releases exclusive access to the SPI bus.
+ * @pre In order to use this function the option @p SPI_USE_MUTUAL_EXCLUSION
+ * must be enabled.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @api
+ */
+void spiReleaseBus(SPIDriver *spip) {
+
+ osalDbgCheck(spip != NULL);
+
+ osalMutexUnlock(&spip->mutex);
+}
+#endif /* SPI_USE_MUTUAL_EXCLUSION */
+
+#endif /* HAL_USE_SPI */
+
+/** @} */
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