diff options
Diffstat (limited to 'os/halnew/include/spi.h')
| -rw-r--r-- | os/halnew/include/spi.h | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/os/halnew/include/spi.h b/os/halnew/include/spi.h new file mode 100644 index 000000000..48182e65d --- /dev/null +++ b/os/halnew/include/spi.h @@ -0,0 +1,310 @@ +/*
+ 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.h
+ * @brief SPI Driver macros and structures.
+ *
+ * @addtogroup SPI
+ * @{
+ */
+
+#ifndef _SPI_H_
+#define _SPI_H_
+
+#if HAL_USE_SPI || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+
+/**
+ * @name SPI configuration options
+ * @{
+ */
+/**
+ * @brief Enables synchronous APIs.
+ * @note Disabling this option saves both code and data space.
+ */
+#if !defined(SPI_USE_WAIT) || defined(__DOXYGEN__)
+#define SPI_USE_WAIT TRUE
+#endif
+
+/**
+ * @brief Enables the @p spiAcquireBus() and @p spiReleaseBus() APIs.
+ * @note Disabling this option saves both code and data space.
+ */
+#if !defined(SPI_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
+#define SPI_USE_MUTUAL_EXCLUSION TRUE
+#endif
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/**
+ * @brief Driver state machine possible states.
+ */
+typedef enum {
+ SPI_UNINIT = 0, /**< Not initialized. */
+ SPI_STOP = 1, /**< Stopped. */
+ SPI_READY = 2, /**< Ready. */
+ SPI_ACTIVE = 3, /**< Exchanging data. */
+ SPI_COMPLETE = 4 /**< Asynchronous operation complete. */
+} spistate_t;
+
+#include "spi_lld.h"
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/**
+ * @name Macro Functions
+ * @{
+ */
+/**
+ * @brief Asserts the slave select signal and prepares for transfers.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @iclass
+ */
+#define spiSelectI(spip) { \
+ spi_lld_select(spip); \
+}
+
+/**
+ * @brief Deasserts the slave select signal.
+ * @details The previously selected peripheral is unselected.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @iclass
+ */
+#define spiUnselectI(spip) { \
+ spi_lld_unselect(spip); \
+}
+
+/**
+ * @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
+ *
+ * @iclass
+ */
+#define spiStartIgnoreI(spip, n) { \
+ (spip)->state = SPI_ACTIVE; \
+ spi_lld_ignore(spip, n); \
+}
+
+/**
+ * @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
+ *
+ * @iclass
+ */
+#define spiStartExchangeI(spip, n, txbuf, rxbuf) { \
+ (spip)->state = SPI_ACTIVE; \
+ spi_lld_exchange(spip, n, txbuf, rxbuf); \
+}
+
+/**
+ * @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
+ *
+ * @iclass
+ */
+#define spiStartSendI(spip, n, txbuf) { \
+ (spip)->state = SPI_ACTIVE; \
+ spi_lld_send(spip, n, txbuf); \
+}
+
+/**
+ * @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
+ *
+ * @iclass
+ */
+#define spiStartReceiveI(spip, n, rxbuf) { \
+ (spip)->state = SPI_ACTIVE; \
+ spi_lld_receive(spip, n, rxbuf); \
+}
+
+/**
+ * @brief Exchanges one frame using a polled wait.
+ * @details This synchronous function exchanges one frame using a polled
+ * synchronization method. This function is useful when exchanging
+ * small amount of data on high speed channels, usually in this
+ * situation is much more efficient just wait for completion using
+ * polling than suspending the thread waiting for an interrupt.
+ * @note This API is implemented as a macro in order to minimize latency.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ * @param[in] frame the data frame to send over the SPI bus
+ * @return The received data frame from the SPI bus.
+ */
+#define spiPolledExchange(spip, frame) spi_lld_polled_exchange(spip, frame)
+/** @} */
+
+/**
+ * @name Low Level driver helper macros
+ * @{
+ */
+#if SPI_USE_WAIT || defined(__DOXYGEN__)
+/**
+ * @brief Waits for operation completion.
+ * @details This function waits for the driver to complete the current
+ * operation.
+ * @pre An operation must be running while the function is invoked.
+ * @note No more than one thread can wait on a SPI driver using
+ * this function.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @notapi
+ */
+#define _spi_wait_s(spip) osalThreadSuspendS(&(spip)->thread)
+
+/**
+ * @brief Wakes up the waiting thread.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @notapi
+ */
+#define _spi_wakeup_isr(spip) { \
+ osalSysLockFromISR(); \
+ osalThreadResumeI(&(spip)->thread, MSG_OK); \
+ osalSysUnlockFromISR(); \
+}
+#else /* !SPI_USE_WAIT */
+#define _spi_wait_s(spip)
+#define _spi_wakeup_isr(spip)
+#endif /* !SPI_USE_WAIT */
+
+/**
+ * @brief Common ISR code.
+ * @details This code handles the portable part of the ISR code:
+ * - Callback invocation.
+ * - Waiting thread wakeup, if any.
+ * - Driver state transitions.
+ * .
+ * @note This macro is meant to be used in the low level drivers
+ * implementation only.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ *
+ * @notapi
+ */
+#define _spi_isr_code(spip) { \
+ if ((spip)->config->end_cb) { \
+ (spip)->state = SPI_COMPLETE; \
+ (spip)->config->end_cb(spip); \
+ if ((spip)->state == SPI_COMPLETE) \
+ (spip)->state = SPI_READY; \
+ } \
+ else \
+ (spip)->state = SPI_READY; \
+ _spi_wakeup_isr(spip); \
+}
+/** @} */
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void spiInit(void);
+ void spiObjectInit(SPIDriver *spip);
+ void spiStart(SPIDriver *spip, const SPIConfig *config);
+ void spiStop(SPIDriver *spip);
+ void spiSelect(SPIDriver *spip);
+ void spiUnselect(SPIDriver *spip);
+ void spiStartIgnore(SPIDriver *spip, size_t n);
+ void spiStartExchange(SPIDriver *spip, size_t n,
+ const void *txbuf, void *rxbuf);
+ void spiStartSend(SPIDriver *spip, size_t n, const void *txbuf);
+ void spiStartReceive(SPIDriver *spip, size_t n, void *rxbuf);
+#if SPI_USE_WAIT
+ void spiIgnore(SPIDriver *spip, size_t n);
+ void spiExchange(SPIDriver *spip, size_t n, const void *txbuf, void *rxbuf);
+ void spiSend(SPIDriver *spip, size_t n, const void *txbuf);
+ void spiReceive(SPIDriver *spip, size_t n, void *rxbuf);
+#endif /* SPI_USE_WAIT */
+#if SPI_USE_MUTUAL_EXCLUSION
+ void spiAcquireBus(SPIDriver *spip);
+ void spiReleaseBus(SPIDriver *spip);
+#endif /* SPI_USE_MUTUAL_EXCLUSION */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_SPI */
+
+#endif /* _SPI_H_ */
+
+/** @} */
|