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/*
ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @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(AVR_SPI_USE_SPI1) || defined(__DOXYGEN__)
#define AVR_SPI_USE_SPI1 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_reference_t thread;
#endif /* SPI_USE_WAIT */
#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
/**
* @brief Mutex protecting the bus.
*/
mutex_t mutex;
#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 buffer with data to send.
*/
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 AVR_SPI_USE_SPI1 && !defined(__DOXYGEN__)
extern SPIDriver SPID1;
#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);
#if AVR_SPI_USE_16BIT_POLLED_EXCHANGE
uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
#else
uint8_t spi_lld_polled_exchange(SPIDriver *spip, uint8_t frame);
#endif
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_SPI */
#endif /* _SPI_LLD_H_ */
/** @} */
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