https://devzone.nordicsemi.com/f/nordic-q-a/81123/nrf5340-spi-cs-not-workingI&#39;m unable to get SPI to work on my nRF5340DK board. I can see activity on MOSI and SCK pins, but not on CS. The pin is not even initialized and is floating. My overlay file And my source code: # define SPIDEV DT_NODELABEL ( spi1 ) voiden-USTelligent Community 13Wed, 27 Oct 2021 14:17:07 GMThttps://devzone.nordicsemi.com/thread/336254?ContentTypeID=1Wed, 27 Oct 2021 14:17:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:76d03704-f206-46fd-b370-89a06386cc82Simon<p>I can see that you have set<span>&nbsp;.</span><span>spi_cfg</span>.<span>cs</span><span>= NULL.&nbsp;</span>Check out the following ticket for how to go about this:&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/73140/nrf9160-and-spi-cs-control-inhibited-no-gpio-device">https://devzone.nordicsemi.com/f/nordic-q-a/73140/nrf9160-and-spi-cs-control-inhibited-no-gpio-device</a>&nbsp;</p> <p>You can also take a look at<span>&nbsp;</span><a href="https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.99-ncs1/tests/drivers/spi/spi_loopback/src/spi.c">zephyr/tests/drivers/spi/spi_loopback/src/spi.c</a><span>&nbsp;</span>to see how to set .cs:</p> <ul> <li><a href="https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.99-ncs1/tests/drivers/spi/spi_loopback/src/spi.c#L26-L31">https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.99-ncs1/tests/drivers/spi/spi_loopback/src/spi.c#L26-L31</a></li> <li><a href="https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.99-ncs1/tests/drivers/spi/spi_loopback/src/spi.c#L92-L102">https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.99-ncs1/tests/drivers/spi/spi_loopback/src/spi.c#L92-L102</a></li> <li><a href="https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.99-ncs1/tests/drivers/spi/spi_loopback/src/spi.c#L76">https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.99-ncs1/tests/drivers/spi/spi_loopback/src/spi.c#L76</a>&nbsp;</li> </ul> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/336177?ContentTypeID=1Wed, 27 Oct 2021 11:37:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bc2335bc-0a99-40f6-8e0a-5d9825cede7fSimon<p>Try setting <code>CONFIG_GPIO=y</code> in the prj.conf file.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>