SPI_WRITE_THEN_READ - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Serial Peripheral Interface (S

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NAMEspi_write_then_read − SPI synchronous write followed by read

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SYNOPSISint spi_write_then_read(struct spi_device * spi, const u8 * txbuf, unsigned n_tx, u8 * rxbuf, unsigned n_rx);

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ARGUMENTSspi device with which data will be exchanged txbuf data to be written (need not be dma−safe) n_tx size of txbuf, in bytes rxbuf buffer into which data will be read (need not be dma−safe) n_rx size of rxbuf, in bytes

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CONTEXTcan sleep

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DESCRIPTIONThis performs a half duplex MicroWire style transaction with the device, sending txbuf and then reading rxbuf​. The return value is zero for success, else a negative errno status code​. This call may only be used from a context that may sleep​. Parameters to this routine are always copied using a small buffer; portable code should never use this for more than 32 bytes​. Performance−sensitive or bulk transfer code should instead use spi_{async,sync}() calls with dma−safe buffers​.

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