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Arduino/hardware/sam/system/libsam/include/spi_pdc.h

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/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2009, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ----------------------------------------------------------------------------
*/
/**
* \file
*
* Implementation of SPI PDC driver.
*
*/
#ifndef _SPI_PDC_
#define _SPI_PDC_
/*----------------------------------------------------------------------------
* Headers
*----------------------------------------------------------------------------*/
#include "../chip.h"
/*----------------------------------------------------------------------------
* Definitions
*----------------------------------------------------------------------------*/
/** An unspecified error has occured.*/
#define SPID_ERROR 1
/** SPI driver is currently in use.*/
#define SPID_ERROR_LOCK 2
/*----------------------------------------------------------------------------
* Macros
*----------------------------------------------------------------------------*/
/** Calculates the value of the SCBR field of the Chip Select Register given MCK and SPCK.*/
#define SPID_CSR_SCBR(mck, spck) (SPI_CSR_SCBR(((mck) / (spck))) )
/** Calculates the value of the DLYBS field of the Chip Select Register given delay in ns and MCK.*/
#define SPID_CSR_DLYBS(mck, delay) ( SPI_CSR_DLYBS(((((delay) * ((mck) / 1000000)) / 1000) + 1)) )
/** Calculates the value of the DLYBCT field of the Chip Select Register given delay in ns and MCK.*/
#define SPID_CSR_DLYBCT(mck, delay) ( SPI_CSR_DLYBCT((((delay) / 32 * ((mck) / 1000000)) / 1000) + 1) )
#ifdef __cplusplus
extern "C" {
#endif
/*----------------------------------------------------------------------------
* Types
*----------------------------------------------------------------------------*/
/** SPI transfer complete callback. */
typedef void (*SpidCallback)( uint8_t, void* ) ;
/** \brief Spi Transfer Request prepared by the application upper layer.
*
* This structure is sent to the SPI_SendCommand function to start the transfer.
* At the end of the transfer, the callback is invoked by the interrupt handler.
*/
typedef struct _SpidCmd
{
/** Pointer to the command data. */
uint8_t *pCmd;
/** Command size in bytes. */
uint8_t cmdSize;
/** Pointer to the data to be sent. */
uint8_t *pData;
/** Data size in bytes. */
unsigned short dataSize;
/** SPI chip select. */
uint8_t spiCs;
/** Callback function invoked at the end of transfer. */
SpidCallback callback;
/** Callback arguments. */
void *pArgument;
} SpidCmd ;
/** Constant structure associated with SPI port. This structure prevents
client applications to have access in the same time. */
typedef struct _Spid
{
/** Pointer to SPI Hardware registers */
Spi* pSpiHw ;
/** SPI Id as defined in the product datasheet */
char spiId ;
/** Current SpiCommand being processed */
SpidCmd *pCurrentCommand ;
/** Mutual exclusion semaphore. */
volatile char semaphore ;
} Spid ;
/*----------------------------------------------------------------------------
* Exported functions
*----------------------------------------------------------------------------*/
extern uint32_t SPID_Configure( Spid* pSpid, Spi* pSpiHw, uint8_t spiId ) ;
extern void SPID_ConfigureCS( Spid* pSpid, uint32_t dwCS, uint32_t dwCsr ) ;
extern uint32_t SPID_SendCommand( Spid* pSpid, SpidCmd* pCommand ) ;
extern void SPID_Handler( Spid* pSpid ) ;
extern uint32_t SPID_IsBusy( const Spid* pSpid ) ;
#ifdef __cplusplus
}
#endif
#endif /* #ifndef _SPI_PDC_ */