spi_dma.h File Reference

#include "chip.h"

Go to the source code of this file.

Data Structures
struct	_SpidCmd
	Spi Transfer Request prepared by the application upper layer. More...
struct	_Spid

Macros
#define	SPID_ERROR   1
#define	SPID_ERROR_LOCK   2
#define	SPID_CSR_SCBR(mck, spck)
#define	SPID_CSR_DLYBS(mck, delay)
#define	SPID_CSR_DLYBCT(mck, delay)

Typedefs
typedef void(*)	SpidCallback(uint8_t, void *)
typedef struct _SpidCmd	SpidCmd
	Spi Transfer Request prepared by the application upper layer.
typedef struct _Spid	Spid

Functions
uint32_t	SPID_Configure (Spid *pSpid, Spi *pSpiHw, uint8_t spiId, uint32_t SpiMode, sXdmad *pXdmad)
	Initializes the Spid structure and the corresponding SPI & DMA hardware. select value. The driver will uses DMA channel 0 for RX and DMA channel 1 for TX. The DMA channels are freed automatically when no SPI command processing.
void	SPID_ConfigureCS (Spid *pSpid, uint32_t dwCS, uint32_t dwCsr)
	Configures the parameters for the device corresponding to the cs value.
uint32_t	SPID_SendCommand (Spid *pSpid, SpidCmd *pCommand)
	Starts a SPI master transfer. This is a non blocking function. It will return as soon as the transfer is started.
void	SPID_Handler (Spid *pSpid)
void	SPID_DmaHandler (Spid *pSpid)
uint32_t	SPID_IsBusy (const Spid *pSpid)
	Check if the SPI driver is busy.

Detailed Description

Implementation of SPI driver, transfer data through DMA.

Macro Definition Documentation

SPID_CSR_DLYBCT

#define SPID_CSR_DLYBCT	(		mck,
			delay )

Value:

SPI_CSR_DLYBCT((((delay) / 32 * \
((mck) / 1000000)) / 1000) + 1)

Calculates the value of the DLYBCT field of the Chip Select Register given delay in ns and MCK.

SPID_CSR_DLYBS

#define SPID_CSR_DLYBS	(		mck,
			delay )

Value:

SPI_CSR_DLYBS((((delay) * \
((mck) / 1000000)) / 1000) + 1)

Calculates the value of the DLYBS field of the Chip Select Register given delay in ns and MCK.

SPID_CSR_SCBR

#define SPID_CSR_SCBR	(		mck,
			spck )

Value:

SPI_CSR_SCBR((mck) / (spck))

Calculates the value of the SCBR field of the Chip Select Register given MCK and SPCK.

SPID_ERROR

#define SPID_ERROR   1

An unspecified error has occurred.

SPID_ERROR_LOCK

#define SPID_ERROR_LOCK   2

SPI driver is currently in use.

Typedef Documentation

Spid

typedef struct _Spid Spid

Constant structure associated with SPI port. This structure prevents client applications to have access in the same time.

SpidCallback

typedef void(*) SpidCallback(uint8_t, void *)

SPI transfer complete callback.

SpidCmd

typedef struct _SpidCmd SpidCmd

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.

Function Documentation

SPID_Configure()

uint32_t SPID_Configure ( Spid * pSpid, Spi * pSpiHw, uint8_t spiId, uint32_t spiMode, sXdmad * pXdmad )

extern

Initializes the Spid structure and the corresponding SPI & DMA hardware. select value. The driver will uses DMA channel 0 for RX and DMA channel 1 for TX. The DMA channels are freed automatically when no SPI command processing.

Parameters

pSpid	Pointer to a Spid instance.
pSpiHw	Associated SPI peripheral.
spiId	SPI peripheral identifier.
pDmad	Pointer to a Dmad instance.

SPID_ConfigureCS()

void SPID_ConfigureCS ( Spid * pSpid, uint32_t dwCS, uint32_t dwCsr )

extern

Configures the parameters for the device corresponding to the cs value.

Parameters

pSpid	Pointer to a Spid instance.
cs	number corresponding to the SPI chip select.
csr	SPI_CSR value to setup.

SPID_IsBusy()

uint32_t SPID_IsBusy ( const Spid * pSpid )

extern

Check if the SPI driver is busy.

Parameters

pSpid

Pointer to a Spid instance.

Returns

1 if the SPI driver is currently busy executing a command; otherwise

SPID_SendCommand()

uint32_t SPID_SendCommand ( Spid * pSpid, SpidCmd * pCommand )

extern

Starts a SPI master transfer. This is a non blocking function. It will return as soon as the transfer is started.

Parameters

pSpid	Pointer to a Spid instance.
pCommand	Pointer to the SPI command to execute.

Returns

0 if the transfer has been started successfully; otherwise returns SPID_ERROR_LOCK is the driver is in use, or SPID_ERROR if the command is not valid.