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/*
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 AVR/spi_lld.h
* @brief AVR SPI subsystem low level driver header.
*
* @addtogroup SPI
* @{
*/
#ifndef _SPI_LLD_H_
#define _SPI_LLD_H_
#if HAL_USE_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/** @brief SPI Mode (Polarity/Phase) */
#define SPI_CPOL0_CPHA0 0
#define SPI_CPOL0_CPHA1 1
#define SPI_CPOL1_CPHA0 2
#define SPI_CPOL1_CPHA1 3
#define SPI_MODE_0 SPI_CPOL0_CPHA0
#define SPI_MODE_1 SPI_CPOL0_CPHA1
#define SPI_MODE_2 SPI_CPOL1_CPHA0
#define SPI_MODE_3 SPI_CPOL1_CPHA1
/** @brief Bit order */
#define SPI_LSB_FIRST 0
#define SPI_MSB_FIRST 1
/** @brief SPI clock rate FOSC/x */
#define SPI_SCK_FOSC_2 0
#define SPI_SCK_FOSC_4 1
#define SPI_SCK_FOSC_8 2
#define SPI_SCK_FOSC_16 3
#define SPI_SCK_FOSC_32 4
#define SPI_SCK_FOSC_64 5
#define SPI_SCK_FOSC_128 6
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name Configuration options
* @{
*/
/**
* @brief SPI driver enable switch.
* @details If set to @p TRUE the support for SPI1 is included.
*/
#if !defined(USE_AVR_SPI) || defined(__DOXYGEN__)
#define USE_AVR_SPI FALSE
#endif
/** @} */
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* 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.
* @note Implementations may extend this structure to contain more,
* architecture dependent, fields.
*/
typedef struct {
/**
* @brief Port used of Slave Select
*/
ioportid_t ssport;
/**
* @brief Pad used of Slave Select
*/
uint8_t sspad;
/**
* @brief Polarity/Phase mode
*/
uint8_t mode;
/**
* @brief Use MSB/LSB first?
*/
uint8_t bitorder;
/**
* @brief Clock rate of the subsystem
*/
uint8_t clockrate;
/**
* @brief Operation complete callback.
*/
spicallback_t end_cb;
/* End of the mandatory fields.*/
} SPIConfig;
/**
* @brief Structure representing an SPI driver.
* @note Implementations may extend this structure to contain more,
* architecture dependent, fields.
*/
struct SPIDriver {
/**
* @brief Driver state.
*/
spistate_t state;
/**
* @brief Current configuration data.
*/
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
/**
* @brief Pointer to the buffer with data to send.
*/
const uint8_t *txbuf;
/**
* @brief Number of bytes of data to send.
*/
size_t txbytes;
/**
* @brief Current index in buffer when sending data.
*/
size_t txidx;
/**
* @brief Pointer to the buffer to put received data.
*/
uint8_t *rxbuf;
/**
* @brief Number of bytes of data to receive.
*/
size_t rxbytes;
/**
* @brief Current index in buffer when receiving data.
*/
size_t rxidx;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if USE_AVR_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);
uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_SPI */
#endif /* _SPI_LLD_H_ */
/** @} */
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