1.34.6.7 HSMCI_DmaSetup Function

C

void HSMCI_DmaSetup
(
	uint8_t* buffer,
	uint32_t numBytes,
	HSMCI_DATA_TRANSFER_DIR direction
)

Summary

Sets up the DMA for data tranfers.

Description

The client of the HSMCI PLIB must set up the DMA before initiating a data transfer.

Precondition

HSMCI_Initialize() must have been called first.

Parameters


Param	Description
buffer	Pointer to the read or write buffer depending on the direction specified
numBytes	Number of bytes to read or write
direction	Enumeration of HSMCI_DATA_TRANSFER_DIR type identifying the tranfer direction

Returns

None.

Example

uint8_t readBuffer[512];
HSMCI_DataTransferFlags transferFlags;

transferFlags.isDataPresent = true;
transferFlags.transferDir = HSMCI_DATA_TRANSFER_DIR_READ;
transferFlags.transferType = HSMCI_DATA_TRANSFER_TYPE_SINGLE;

// Set up the DMA to read 512 btyes of data
HSMCI_DmaSetup(readBuffer, 512, HSMCI_DATA_TRANSFER_DIR_READ);

// Send command to read one block of data from SD card starting at block address 100
HSMCI_CommandSend(17, 100, HSMCI_CMD_RESP_R1, transferFlags);

Remarks

None.