34.4.2.9 spi_m_sync_transfer

Perform the SPI data transfer (TX and RX) in polling way.

int32_t spi_m_sync_transfer(
    struct spi_m_sync_descriptor * spi,
    const struct spi_xfer * xfer
)

Activate CS, do TX and RX and deactivate CS. It blocks.

Parameters

spi

Type: struct spi_m_sync_descriptor Struct *

Pointer to the HAL SPI instance.

xfer

Type: const struct spi_xfer *

Pointer to the transfer information (spi_xfer).

Returns

Type: int32_t

size

Success.

>=0

Timeout, with number of characters transferred.

ERR_BUSY

SPI is busy