https://devzone.nordicsemi.com/f/nordic-q-a/34899/how-do-i-add-twi-driver-to-blinky-appHi Env: keil and no SD I am doing the first steps on keil + nordic nrf51822. I started by opening the Blinky app (C:\Keil_v5\ARM\PACK\NordicSemiconductor\nRF_Examples\11.0.0-2.alpha\peripheral\blinky\pca10028\blank\arm5) and it compiles well anden-USTelligent Community 13Wed, 30 May 2018 12:40:34 GMThttps://devzone.nordicsemi.com/thread/134031?ContentTypeID=1Wed, 30 May 2018 12:40:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:066804d3-ca13-4a5a-9270-8cea314f74a7H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>It seems that you are using the Keil packs to install the SDK. This was deprecated a while back, as there were many issues with this.</p> <p>I would recommend starting development with the latest SDK for nRF51-series devices, which is v12.3. You can download it here:</p> <p><a href="http://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v12.x.x/">http://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v12.x.x/</a></p> <p>&nbsp;</p> <p>This SDK version has more TWI examples that you can use as a template for your project.</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Håkon</p> <p>&nbsp;</p><div style="clear:both;"></div>