https://devzone.nordicsemi.com/f/nordic-q-a/89640/zephyr-null-pointer-checksHello, In function such as i2c_write and i2c_read does Zephyr check to make sure the device is not a NULL pointer? If not how would it react if it were passed one? Thanks, Jacoben-USTelligent Community 13Tue, 05 Jul 2022 15:07:08 GMThttps://devzone.nordicsemi.com/thread/375607?ContentTypeID=1Tue, 05 Jul 2022 15:07:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:56891a20-5fa1-4bca-87a3-312d9ff09904Simon<p>I haven&#39;t tested this, but I think -EIO (-5, ) will be returned</p> <p>When i2c_tranfer is called when you&#39;re using the&nbsp;driver&nbsp;\zephyr\drivers\i2c\i2c_nrfx_twim.c (which is the case if the compatible is set to&nbsp;<span>&quot;nordic,nrf-twim&quot; in the i2c node</span>) the following functions are called:</p> <ul> <li>i2c_write() (\zephyr\include\zephyr\drivers\i2c.h)</li> <li>i2c_transfer()&nbsp;&nbsp;(\zephyr\include\zephyr\drivers\i2c.h)</li> <li> <div> <div><span>i2c_nrfx_twim_transfer() (\zephyr\drivers\i2c\i2c_nrfx_twim.c)</span></div> </div> <ul> <li><a href="https://github.com/nrfconnect/sdk-zephyr/blob/v3.0.99-ncs1/drivers/i2c/i2c_nrfx_twim.c#L59">-EIO is returned</a></li> </ul> </li> </ul> <p>Please test this yourself and see if this is the case</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>