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/*
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 AT91SAM7/spi_lld.h
* @brief AT91SAM7 low level SPI driver header.
*
* @addtogroup AT91SAM7_SPI
* @{
*/
#ifndef _SPI_LLD_H_
#define _SPI_LLD_H_
#if CH_HAL_USE_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Device compatibility. SAM7X have 2 SPIs. */
/*===========================================================================*/
#if defined (AT91SAM7X256_H)
#define AT91C_BASE_SPI AT91C_BASE_SPI0
#define AT91C_ID_SPI AT91C_ID_SPI0
#endif
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief SPI driver enable switch.
* @details If set to @p TRUE the support for SPI0 is included.
* @note The default is @p TRUE.
*/
#if !defined(USE_AT91SAM7_SPI) || defined(__DOXYGEN__)
#define USE_AT91SAM7_SPI TRUE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver configuration structure.
*/
typedef struct {
/**
* @brief The chip select line port.
*/
ioportid_t spc_ssport;
/**
* @brief The chip select line pad number.
*/
uint16_t spc_sspad;
/**
* @brief SPI Mode Register initialization data.
*/
uint32_t spc_mr;
/**
* @brief SPI Chip Select Register initialization data.
*/
uint32_t spc_csr;
} SPIConfig;
/**
* @brief Structure representing a SPI driver.
*/
typedef struct {
/**
* @brief Driver state.
*/
spistate_t spd_state;
#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
/**
* @brief Mutex protecting the bus.
*/
Mutex spd_mutex;
#elif CH_USE_SEMAPHORES
Semaphore spd_semaphore;
#endif
#endif /* SPI_USE_MUTUAL_EXCLUSION */
/**
* @brief Current configuration data.
*/
const SPIConfig *spd_config;
/* End of the mandatory fields.*/
} SPIDriver;
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if USE_AT91SAM7_SPI && !defined(__DOXYGEN__)
extern SPIDriver SPID;
#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);
#ifdef __cplusplus
}
#endif
#endif /* CH_HAL_USE_SPI */
#endif /* _SPI_LLD_H_ */
/** @} */
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