225 lines
7.1 KiB
C
225 lines
7.1 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file AT91SAM7/spi_lld.h
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* @brief AT91SAM7 low level SPI driver header.
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*
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* @addtogroup SPI
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* @{
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*/
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#ifndef _SPI_LLD_H_
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#define _SPI_LLD_H_
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#if CH_HAL_USE_SPI || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Device compatibility.. */
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/*===========================================================================*/
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#if defined (AT91C_BASE_SPI)
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#define AT91C_BASE_SPI0 AT91C_BASE_SPI
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#define AT91C_ID_SPI0 AT91C_ID_SPI
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#define SPI0_MISO (1 << 12)
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#define SPI0_MOSI (1 << 13)
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#define SPI0_SCK (1 << 14)
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#else
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#define SPI0_MISO (1 << 16)
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#define SPI0_MOSI (1 << 17)
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#define SPI0_SCK (1 << 18)
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#define SPI1_MISO (1 << 24)
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#define SPI1_MOSI (1 << 23)
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#define SPI1_SCK (1 << 22)
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#endif
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @brief SPID1 enable switch (SPI0 device).
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* @details If set to @p TRUE the support for SPI0 is included.
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* @note The default is @p TRUE.
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*/
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#if !defined(AT91SAM7_SPI_USE_SPI0) || defined(__DOXYGEN__)
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#define AT91SAM7_SPI_USE_SPI0 TRUE
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#endif
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/**
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* @brief SPID2 enable switch (SPI1 device).
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* @details If set to @p TRUE the support for SPI1 is included.
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* @note The default is @p TRUE.
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*/
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#if !defined(AT91SAM7_SPI_USE_SPI1) || defined(__DOXYGEN__)
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#define AT91SAM7_SPI_USE_SPI1 TRUE
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#endif
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/**
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* @brief SPI0 device interrupt priority level setting.
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*/
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#if !defined(AT91SAM7_SPI0_PRIORITY) || defined(__DOXYGEN__)
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#define AT91SAM7_SPI0_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 1)
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#endif
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/**
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* @brief SPI1 device interrupt priority level setting.
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*/
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#if !defined(AT91SAM7_SPI1_PRIORITY) || defined(__DOXYGEN__)
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#define AT91SAM7_SPI1_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 1)
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#endif
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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#if defined (AT91C_BASE_SPI) && AT91SAM7_SPI_USE_SPI1
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#error "SPI1 not present"
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#endif
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#if !AT91SAM7_SPI_USE_SPI0 && !AT91SAM7_SPI_USE_SPI1
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#error "SPI driver activated but no SPI peripheral assigned"
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#endif
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief Type of a structure representing an SPI driver.
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*/
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typedef struct SPIDriver SPIDriver;
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/**
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* @brief SPI notification callback type.
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*
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* @param[in] spip pointer to the @p SPIDriver object triggering the
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* callback
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*/
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typedef void (*spicallback_t)(SPIDriver *spip);
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/**
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* @brief Driver configuration structure.
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*/
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typedef struct {
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/**
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* @brief Operation complete callback or @p NULL.
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* @note In order to use synchronous functions this field must be set to
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* @p NULL, callbacks and synchronous operations are mutually
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* exclusive.
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*/
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spicallback_t spc_endcb;
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/* End of the mandatory fields.*/
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/**
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* @brief The chip select line port.
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*/
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ioportid_t spc_ssport;
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/**
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* @brief The chip select line pad number.
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*/
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uint16_t spc_sspad;
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/**
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* @brief SPI Chip Select Register initialization data.
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*/
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uint32_t spc_csr;
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} SPIConfig;
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/**
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* @brief Structure representing a SPI driver.
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*/
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struct SPIDriver {
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/**
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* @brief Driver state.
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*/
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spistate_t spd_state;
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/**
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* @brief Current configuration data.
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*/
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const SPIConfig *spd_config;
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#if SPI_USE_WAIT || defined(__DOXYGEN__)
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/**
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* @brief Waiting thread.
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*/
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Thread *spd_thread;
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#endif /* SPI_USE_WAIT */
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#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
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#if CH_USE_MUTEXES || defined(__DOXYGEN__)
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/**
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* @brief Mutex protecting the bus.
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*/
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Mutex spd_mutex;
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#elif CH_USE_SEMAPHORES
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Semaphore spd_semaphore;
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#endif
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#endif /* SPI_USE_MUTUAL_EXCLUSION */
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#if defined(SPI_DRIVER_EXT_FIELDS)
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SPI_DRIVER_EXT_FIELDS
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#endif
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/* End of the mandatory fields.*/
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/**
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* @brief Pointer to the SPIx registers block.
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*/
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AT91PS_SPI spd_spi;
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};
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if AT91SAM7_SPI_USE_SPI0 && !defined(__DOXYGEN__)
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extern SPIDriver SPID1;
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#endif
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#if AT91SAM7_SPI_USE_SPI1 && !defined(__DOXYGEN__)
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extern SPIDriver SPID2;
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void spi_lld_init(void);
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void spi_lld_start(SPIDriver *spip);
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void spi_lld_stop(SPIDriver *spip);
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void spi_lld_select(SPIDriver *spip);
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void spi_lld_unselect(SPIDriver *spip);
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void spi_lld_ignore(SPIDriver *spip, size_t n);
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void spi_lld_exchange(SPIDriver *spip, size_t n,
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const void *txbuf, void *rxbuf);
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void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
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void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
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#ifdef __cplusplus
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}
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#endif
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#endif /* CH_HAL_USE_SPI */
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#endif /* _SPI_LLD_H_ */
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/** @} */
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