https://devzone.nordicsemi.com/f/nordic-q-a/60198/undefined-reference-in-nrf52xx-to-thingy-52-exampleI am doing this nRF52xx-to-Thingy-52 example: https://github.com/crfosse/Thingy-52-to-nRF52xx I am able to get the led part working fine, but when I finish the instructions the build is failed with errors shown in image: First it had error: Cannoten-USTelligent Community 13Wed, 15 Apr 2020 11:09:53 GMThttps://devzone.nordicsemi.com/thread/244687?ContentTypeID=1Wed, 15 Apr 2020 11:09:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b460e04c-1b57-47b0-b7c8-0e4d6f224271jorse131<p>Thank you for your answers. I just found out that I needed to add&nbsp;<span>ble_tes_c.c and ble_tbs_c.c files manually in Segger Studio project folder.<br />Because linking was the problem. Now it builds, but something wrong in debugging. Have to look at that.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/244684?ContentTypeID=1Wed, 15 Apr 2020 11:01:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a35af770-e725-4eab-804e-df9c2e7ca42cKenneth<p>Did you follow &quot;<span>Note&nbsp;3&quot; in <a href="https://github.com/crfosse/Thingy-52-to-nRF52xx">https://github.com/crfosse/Thingy-52-to-nRF52xx</a>&nbsp;?</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/244680?ContentTypeID=1Wed, 15 Apr 2020 10:46:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:27469583-f77a-4f6e-ae52-566dd03c4c68Nguyen Hoan Hoang<p>a better one here&nbsp;<a href="https://github.com/IOsonata/IOsonata/tree/master/ARM/Nordic/exemples/BlueIOThingy">https://github.com/IOsonata/IOsonata/tree/master/ARM/Nordic/exemples/BlueIOThingy</a></p> <p>It is not compatible with SES. You can use IAR, Eclipse, CrossWorks, Keil</p><div style="clear:both;"></div>