spi_dma.c File Reference

#include "chip.h"

Macros
#define	USE_SPI_DMA
#define	DMA_SPI_LLI   2

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.
uint32_t	SPID_IsBusy (const Spid *pSpid)
	Check if the SPI driver is busy.

Detailed Description

Implementation for the SPI Flash with xDMA driver.

Macro Definition Documentation

DMA_SPI_LLI

#define DMA_SPI_LLI   2

xDMA Link List size for SPI transmission

USE_SPI_DMA

#define USE_SPI_DMA

xDMA support

Function Documentation

SPID_Configure()

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.

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 )

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

)

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 )

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.