https://devzone.nordicsemi.com/f/nordic-q-a/11831/i2c-pn532-problem-clock-stretchingHi, I am trying to connect a PN532 (RFID Tag Reader module) to BLE Nano (nrf58122) using I2C. This doesn&#39;t work, and I&#39;m trying to figure out why. I am generating the code via Arduino IDE. The sketch compiles and works beautifully with an Arduinoen-USTelligent Community 13Mon, 22 Feb 2016 13:21:03 GMThttps://devzone.nordicsemi.com/thread/44779?ContentTypeID=1Mon, 22 Feb 2016 13:21:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7e3892fa-b066-4595-bf0c-4d91c72e1f21run_ar<p>Shouldn&#39;t your transmission look more like this (from redbearlabs github):</p> <pre><code>Wire.beginTransmission(DEV_ADDR); Wire.write((uint8_t)addr&gt;&gt;8); Wire.write((uint8_t)addr); Wire.write(pbuf, len); Wire.endTransmission(); </code></pre><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/44780?ContentTypeID=1Mon, 22 Feb 2016 13:09:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0263a8ae-e51d-400a-a1a7-6669efbf3a59run_ar<p>Not sure what this is, I assume you are using the latest RedBearLab nRF51822 add-on for Arduino IDE? Which in case I would suggest you create an issue on their <a href="https://github.com/RedBearLab/nRF51822-Arduino/tree/S130/arduino-1.6.x/hardware/RBL/RBL_nRF51822/libraries/Wire">github page</a>.</p><div style="clear:both;"></div>