294 lines
12 KiB
C
294 lines
12 KiB
C
/*
|
|
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 spi.h
|
|
* @brief SPI Driver macros and structures.
|
|
*
|
|
* @addtogroup SPI
|
|
* @{
|
|
*/
|
|
|
|
#ifndef _SPI_H_
|
|
#define _SPI_H_
|
|
|
|
#if CH_HAL_USE_SPI || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Driver constants. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver pre-compile time settings. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @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. */
|
|
/*===========================================================================*/
|
|
|
|
#if SPI_USE_MUTUAL_EXCLUSION && !CH_USE_MUTEXES && !CH_USE_SEMAPHORES
|
|
#error "SPI_USE_MUTUAL_EXCLUSION requires CH_USE_MUTEXES and/or CH_USE_SEMAPHORES"
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* 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. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @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)->spd_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)->spd_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)->spd_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)->spd_state = SPI_ACTIVE; \
|
|
spi_lld_receive(spip, n, rxbuf); \
|
|
}
|
|
|
|
#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(spip) { \
|
|
chDbgAssert((spip)->spd_thread == NULL, \
|
|
"_spi_wait(), #1", "already waiting"); \
|
|
(spip)->spd_thread = chThdSelf(); \
|
|
chSchGoSleepS(THD_STATE_SUSPENDED); \
|
|
}
|
|
|
|
/**
|
|
* @brief Wakes up the waiting thread.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
#define _spi_wakeup(spip) { \
|
|
chSysLockFromIsr(); \
|
|
if ((spip)->spd_thread != NULL) { \
|
|
Thread *tp = (spip)->spd_thread; \
|
|
(spip)->spd_thread = NULL; \
|
|
chSchReadyI(tp); \
|
|
} \
|
|
chSysUnlockFromIsr(); \
|
|
}
|
|
#else /* !SPI_USE_WAIT */
|
|
#define _spi_wakeup(spip)
|
|
#define _spi_wait(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->spd_config->spc_endcb) { \
|
|
spip->spd_state = SPI_COMPLETE; \
|
|
spip->spd_config->spc_endcb(spip); \
|
|
if (spip->spd_state == SPI_COMPLETE) \
|
|
spip->spd_state = SPI_READY; \
|
|
} \
|
|
else { \
|
|
spip->spd_state = SPI_READY; \
|
|
_spi_wakeup(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 /* CH_HAL_USE_SPI */
|
|
|
|
#endif /* _SPI_H_ */
|
|
|
|
/** @} */
|