How Use SPI sdk 1.6.1 zephyr

[Fb62]

Hello,

i need a very sample code for ,open a SPI device ad send , receive a byte.

In particular how open the device tree spi device,

how write a byte 

how read a byte.

Best Regards.

Fausto

[Kenneth]

Hello,

There are many ways this can be done:

1. Use the zephyr spi driver, then see this example for reference (made for the nRF5340, but should be portable for the nRF52-series):
https://devzone.nordicsemi.com/f/nordic-q-a/67065/how-to-configure-and-setup-an-spi-device-to-nrf5340/275002#275002 

If you are using nRF52-series it should be a bit simpler than nRF53 in terms of configuration, since you don't have to consider that there are two cores like on the nRF5340 (network and app core, e.g. remove CONFIG_BOARD_ENABLE_CPUNET from prj.conf).

2. Use the nrfx spi driver directly, then see this example for reference (made for nRF52-DK):
https://devzone.nordicsemi.com/f/nordic-q-a/66488/using-spi-with-ppi-in-zephyr/272139#272139

3. Setup spi from scratch, then see this example this example for reference (the example show i2c, so you need to change to spi):
https://devzone.nordicsemi.com/nordic/nrf-connect-sdk-guides/b/peripherals/posts/twi-ic2-implementation-with-nrfx-twis-driver 

Best regards,
Kenneth