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

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NAMEspi_sync − blocking/synchronous SPI data transfers

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SYNOPSISint spi_sync(struct spi_device * spi, struct spi_message * message);

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ARGUMENTSspi device with which data will be exchanged message describes the data transfers

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CONTEXTcan sleep

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DESCRIPTIONThis call may only be used from a context that may sleep​. The sleep is non−interruptible, and has no timeout​. Low−overhead controller drivers may DMA directly into and out of the message buffers​. Note that the SPI device´s chip select is active during the message, and then is normally disabled between messages​. Drivers for some frequently−used devices may want to minimize costs of selecting a chip, by leaving it selected in anticipation that the next message will go to the same chip​. (That may increase power usage​.) Also, the caller is guaranteeing that the memory associated with the message will not be freed before this call returns​. It returns zero on success, else a negative error code​.

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