RE: [SPIS driver] How can I response different data (Tx buffer) when I receive data (Rx buffer) from SPI Master ?

Sylar — Fri, 18 Dec 2020 02:22:32 GMT

Hi Kenneth

Thanks for your explanation.

RE: [SPIS driver] How can I response different data (Tx buffer) when I receive data (Rx buffer) from SPI Master ?

Kenneth — Thu, 17 Dec 2020 13:45:07 GMT

[quote userid="97298" url="~/f/nordic-q-a/69633/spis-driver-how-can-i-response-different-data-tx-buffer-when-i-receive-data-rx-buffer-from-spi-master"]The callback handler function will be called after every successful buffer setup and every completed transfer. New buffers must be set by calling nrf_drv_spis_buffers_set after every finished transaction.[/quote]

That is correct, so basically the master spi device need to send two spi transactions, the first spi transaction can be analyzed by the spi slave and the spi slave will then update the buffers for the second spi transaction. The first spi transaction can be 1-2bytes, while the second spi transaction can then be much longer depending for instance on the content of the first spi transaction.