/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011 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 . */ /** * @file AT91SAM7/spi_lld.h * @brief AT91SAM7 low level SPI driver header. * * @addtogroup SPI * @{ */ #ifndef _SPI_LLD_H_ #define _SPI_LLD_H_ #if HAL_USE_SPI || defined(__DOXYGEN__) /*===========================================================================*/ /* Device compatibility.. */ /*===========================================================================*/ #if defined (AT91C_BASE_SPI) #define AT91C_BASE_SPI0 AT91C_BASE_SPI #define AT91C_ID_SPI0 AT91C_ID_SPI #define SPI0_MISO (1 << 12) #define SPI0_MOSI (1 << 13) #define SPI0_SCK (1 << 14) #else #define SPI0_MISO (1 << 16) #define SPI0_MOSI (1 << 17) #define SPI0_SCK (1 << 18) #define SPI1_MISO (1 << 24) #define SPI1_MOSI (1 << 23) #define SPI1_SCK (1 << 22) #endif /*===========================================================================*/ /* Driver constants. */ /*===========================================================================*/ /*===========================================================================*/ /* Driver pre-compile time settings. */ /*===========================================================================*/ /** * @brief SPID1 enable switch (SPI0 device). * @details If set to @p TRUE the support for SPI0 is included. * @note The default is @p TRUE. */ #if !defined(AT91SAM7_SPI_USE_SPI0) || defined(__DOXYGEN__) #define AT91SAM7_SPI_USE_SPI0 TRUE #endif /** * @brief SPID2 enable switch (SPI1 device). * @details If set to @p TRUE the support for SPI1 is included. * @note The default is @p TRUE. */ #if !defined(AT91SAM7_SPI_USE_SPI1) || defined(__DOXYGEN__) #define AT91SAM7_SPI_USE_SPI1 TRUE #endif /** * @brief SPI0 device interrupt priority level setting. */ #if !defined(AT91SAM7_SPI0_PRIORITY) || defined(__DOXYGEN__) #define AT91SAM7_SPI0_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 1) #endif /** * @brief SPI1 device interrupt priority level setting. */ #if !defined(AT91SAM7_SPI1_PRIORITY) || defined(__DOXYGEN__) #define AT91SAM7_SPI1_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 1) #endif /*===========================================================================*/ /* Derived constants and error checks. */ /*===========================================================================*/ #if defined (AT91C_BASE_SPI) && AT91SAM7_SPI_USE_SPI1 #error "SPI1 not present" #endif #if !AT91SAM7_SPI_USE_SPI0 && !AT91SAM7_SPI_USE_SPI1 #error "SPI driver activated but no SPI peripheral assigned" #endif /*===========================================================================*/ /* Driver data structures and types. */ /*===========================================================================*/ /** * @brief Type of a structure representing an SPI driver. */ typedef struct SPIDriver SPIDriver; /** * @brief SPI notification callback type. * * @param[in] spip pointer to the @p SPIDriver object triggering the * callback */ typedef void (*spicallback_t)(SPIDriver *spip); /** * @brief Driver configuration structure. */ typedef struct { /** * @brief Operation complete callback or @p NULL. */ spicallback_t end_cb; /* End of the mandatory fields.*/ /** * @brief The chip select line port. */ ioportid_t ssport; /** * @brief The chip select line pad number. */ uint16_t sspad; /** * @brief SPI Chip Select Register initialization data. */ uint32_t csr; } SPIConfig; /** * @brief Structure representing a SPI driver. */ struct SPIDriver { /** * @brief Driver state. */ spistate_t state; /** * @brief Current configuration data. */ const SPIConfig *config; #if SPI_USE_WAIT || defined(__DOXYGEN__) /** * @brief Waiting thread. */ Thread *thread; #endif /* SPI_USE_WAIT */ #if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__) #if CH_USE_MUTEXES || defined(__DOXYGEN__) /** * @brief Mutex protecting the bus. */ Mutex mutex; #elif CH_USE_SEMAPHORES Semaphore semaphore; #endif #endif /* SPI_USE_MUTUAL_EXCLUSION */ #if defined(SPI_DRIVER_EXT_FIELDS) SPI_DRIVER_EXT_FIELDS #endif /* End of the mandatory fields.*/ /** * @brief Pointer to the SPIx registers block. */ AT91PS_SPI spi; }; /*===========================================================================*/ /* Driver macros. */ /*===========================================================================*/ /*===========================================================================*/ /* External declarations. */ /*===========================================================================*/ #if AT91SAM7_SPI_USE_SPI0 && !defined(__DOXYGEN__) extern SPIDriver SPID1; #endif #if AT91SAM7_SPI_USE_SPI1 && !defined(__DOXYGEN__) extern SPIDriver SPID2; #endif #ifdef __cplusplus extern "C" { #endif void spi_lld_init(void); void spi_lld_start(SPIDriver *spip); void spi_lld_stop(SPIDriver *spip); void spi_lld_select(SPIDriver *spip); void spi_lld_unselect(SPIDriver *spip); void spi_lld_ignore(SPIDriver *spip, size_t n); void spi_lld_exchange(SPIDriver *spip, size_t n, const void *txbuf, void *rxbuf); void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf); void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf); uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame); #ifdef __cplusplus } #endif #endif /* HAL_USE_SPI */ #endif /* _SPI_LLD_H_ */ /** @} */