dma_xfer()

Synopsis:

int (*dma_xfer)( void *const hdl,
                 spi_dev_t *spi_dev,
                 dma_addr_t *addr,
                 const uint32_t tnbytes,
                 const uint32_t rnbytes );

Arguments:

hdl

The handle of the low-level module that spi_init() returns.

spi_dev

A pointer to the SPI device structure, spi_dev_t.

addr

A pointer to the DMA address structure, dma_addr_t.

tnbytes

The number of transmit bytes.

rnbytes

The number of receive bytes.

Description:

The dma_xfer() function initiates a DMA transmit, receive, or exchange transaction.

Errors:

The dma_xfer() function returns an errno. For values of errno, refer to the C Library Reference.