xfer()

Synopsis:

int (*xfer)( void *const hdl,
             spi_dev_t *const spi_dev,
             uint8_t *const buf,
             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.

buf

The buffer which stores the transfer data.

tnbytes

The number of transmit bytes.

rnbytes

The number of receive bytes.

Description:

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

Errors:

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