NRF5340 : Issue in Configuring Non-blocking I2C in Zephyr OShttps://devzone.nordicsemi.com/f/nordic-q-a/121746/nrf5340-issue-in-configuring-non-blocking-i2c-in-zephyr-osI&#39;m using the nRF Connect SDK on nrf5340dk and encountering issues when trying to use the non-blocking (asynchronous) I2C API. i am particularly getting this error - ENOSYS while using this function : i2c_transfer_cb_dt() When I switch from the blockingen-USTelligent Community 13Thu, 30 Jul 2026 02:45:37 GMTRE: NRF5340 : Issue in Configuring Non-blocking I2C in Zephyr OShttps://devzone.nordicsemi.com/thread/569664?ContentTypeID=1Thu, 30 Jul 2026 02:45:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d6e5f7c3-b8cf-4d23-a76d-b8e57fc333027in<p>Hi!<br /><br />&nbsp; &nbsp;me too;</p> <p>&nbsp; &nbsp;NCS 3.4.0&nbsp;&nbsp;nrf52840DK</p> <p>&nbsp;<span>i2c_transfer_cb_dt()&nbsp; point NULL&nbsp;</span><br /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1785379141000v1.png" alt=" " /><br />config<br /><br /></p> <div> <div><span>CONFIG_USB_DEVICE_STACK_NEXT</span><span>=y</span></div> <div><span>CONFIG_CDC_ACM_SERIAL_INITIALIZE_AT_BOOT</span><span>=n</span></div> <div><span>CONFIG_USBD_HID_SUPPORT</span><span>=y</span></div> <br /> <div><span>CONFIG_LOG</span><span>=y</span></div> <div><span>CONFIG_USBD_LOG_LEVEL_WRN</span><span>=y</span></div> <div><span>CONFIG_USBD_HID_LOG_LEVEL_WRN</span><span>=y</span></div> <div><span>CONFIG_UDC_DRIVER_LOG_LEVEL_WRN</span><span>=y</span></div> <div><span>CONFIG_SAMPLE_USBD_PID</span><span>=0x0007</span></div> <br /> <div><span>CONFIG_GPIO</span><span>=y</span></div> <div><span>CONFIG_INPUT</span><span>=y</span></div> <br /> <div><span>CONFIG_I2C</span><span>=y</span></div> <div><span>CONFIG_I2C_NRFX</span><span>=y</span></div> <br /> <div><span>CONFIG_I2C_CALLBACK</span><span>=y</span></div> <br /> <div><span>CONFIG_RTIO</span><span>=y</span></div> <div><span>CONFIG_I2C_RTIO</span><span>=y</span></div> </div> <p></p> <div> <div><span>&nbsp;</span><span>* Copyright (c) 2023 Nordic Semiconductor ASA</span></div> <div><span>&nbsp;</span><span>*</span></div> <div><span>&nbsp;</span><span>* SPDX-License-Identifier: Apache-2.0</span></div> <div><span>&nbsp;</span><span>*/</span></div> <div><span>&amp;</span><span>spi1</span><span> {</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; </span><span>status</span><span> </span><span>=</span><span> </span><span>&quot;disabled&quot;</span><span>;</span></div> <div><span>};</span></div> <br /> <div><span>/</span><span> {</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; </span><span>hid_dev_0</span><span>:</span><span> </span><span>hid_dev_0</span><span> {</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>compatible</span><span> </span><span>=</span><span> </span><span>&quot;zephyr,hid-device&quot;</span><span>;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>label</span><span> </span><span>=</span><span> </span><span>&quot;HID0&quot;</span><span>;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>protocol-code</span><span> </span><span>=</span><span> </span><span>&quot;none&quot;</span><span>;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>in-polling-period-us</span><span> </span><span>=</span><span> &lt;</span><span>1000</span><span>&gt;;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>in-report-size</span><span> </span><span>=</span><span> &lt;</span><span>64</span><span>&gt;;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; };</span></div> <br /> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; </span><span>zephyr,user</span><span> {</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>//label = &quot;tp_int&quot;;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>tp-int-gpios</span><span> </span><span>=</span><span> &lt;</span><span>&amp;</span><span>gpio0</span><span> </span><span>30</span><span> </span><span>GPIO_PULL_UP</span><span>&gt;; &nbsp; </span><span>/* 改用标准属性名 gpios */</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; };</span></div> <div><span>};</span></div> <br /> <div><span>&amp;</span><span>i2c0</span><span> {</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; </span><span>clock-frequency</span><span> </span><span>=</span><span> &lt;</span><span>DT_FREQ_K</span><span>(</span><span>400</span><span>)&gt;;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; </span><span>compatible</span><span> </span><span>=</span><span> </span><span>&quot;nordic,nrf-twim&quot;</span><span>;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; </span><span>easydma-maxcnt-bits</span><span> </span><span>=</span><span> &lt;</span><span>16</span><span>&gt;;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; </span><span>touchpad</span><span>:</span><span> </span><span>touchpad_amira</span><span>@</span><span>2c</span><span> {</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>compatible</span><span> </span><span>=</span><span> </span><span>&quot;zephyr,i2c-device&quot;</span><span>;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span>reg</span><span> </span><span>=</span><span> &lt;</span><span>0x2c</span><span>&gt;;</span></div> <div><span>&nbsp; &nbsp; &nbsp; &nbsp; };</span></div> <div><span>};</span></div> <br /> <div> <div><span>api</span><span>-&gt;</span><span>transfer_cb</span><span> </span><span>==</span><span> </span><span>NULL!!!</span></div> <div><span></span></div> <div><span></span></div> <div><span>&nbsp;could you help me!</span></div> <div><span></span></div> </div> Thinks_&mdash;&mdash;_</div> <div></div> <div></div><div style="clear:both;"></div>RE: NRF5340 : Issue in Configuring Non-blocking I2C in Zephyr OShttps://devzone.nordicsemi.com/thread/536928?ContentTypeID=1Mon, 26 May 2025 12:29:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e9f367cb-7cbc-4d6f-9df6-5c9d40420884Sigurd<p>Hi!</p> <p>What NCS version are you using? I think it&#39;s only supported in the latest versions<br /><br />Might need to add this:</p> <p>CONFIG_RTIO=y<br />CONFIG_I2C_RTIO=y</p><div style="clear:both;"></div>