https://devzone.nordicsemi.com/f/nordic-q-a/107453/eeprom-non-blockingI have an nRF5340 with an AT24CM01 EEPROM on an I2C bus (SDA = P0.16, SDL = P0.17). My devicetree looks like so: I&#39;m having troubles when writing and reading in rapid succession. If I do this, it throws a bunch of errors: From other forum postsen-USTelligent Community 13Wed, 17 Jan 2024 17:24:00 GMThttps://devzone.nordicsemi.com/thread/464681?ContentTypeID=1Wed, 17 Jan 2024 17:24:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6893077f-095f-447b-ae31-cd033a73ea53J&#248;rgen Holmefjord<p>Hi,</p> <p>The NACK error is generated when the I2C/TWI slave device NACKs the transaction. The Zephyr library can&#39;t know if the external EEPROM device is ready to receive new data or not, so it will pass the error to the application.</p> <p>I do not have any experience with this specific EEPROM, but having a quick look at the <a href="https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/AT24CM01-I2C-Compatible-Two-Wire-Serial-EEPROM-Data-Sheet-20006170A.pdf">datasheet</a>, this seems to be the expected behavior:</p> <p><img style="max-height:240px;max-width:320px;" alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/AT24CM01_5F00_1.png" /></p> <p><img style="max-height:240px;max-width:320px;" alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/AT24CM01_5F00_3.png" /></p> <p><img style="max-height:240px;max-width:320px;" alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/AT24CM01_5F00_2.png" /></p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>