https://devzone.nordicsemi.com/f/nordic-q-a/1060/ble-and-twiHello, I&#39;ve been trying to get my TWI device working in conjunction with the BLE stack (i.e. s110 softdevice is enabled) on a nRF51822. I found another thread with an attached sd_twi_hw_master.c to demonstrate proper use of the PPI channels whileen-USTelligent Community 13Wed, 04 May 2016 10:33:43 GMThttps://devzone.nordicsemi.com/thread/5022?ContentTypeID=1Wed, 04 May 2016 10:33:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:61c20311-fe2e-42c6-a1a3-d442c771da30Brook Gebremedhin<p>@hkn</p> <p>i don&#39;t find any where a working makefile that has twi and soft device enabled. can you direct me to a working makefile that has twi and softdvice together ? thanks</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/5023?ContentTypeID=1Wed, 04 Dec 2013 19:18:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4aa2574a-2c88-45ba-aee2-b152a9b4cedajc<p>Thanks for the tips Håkon. You&#39;re right. This was a port of some legacy code and the slave did not live at the address I was using.</p> <p>It all works as expected now.</p> <p>-jc</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/5021?ContentTypeID=1Wed, 04 Dec 2013 13:38:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:34f795c5-330b-4b7e-90bf-f32ea194c8a8H&#229;kon Alseth<p>Hi,</p> <p>That indicates that you are getting a NACK on the TWI-bus.</p> <ol> <li>Are you sure you have the correct address to your slave?</li> <li>Do you ever get the TXDSENT event?</li> </ol> <p>I would recommend scoping the TWI-lines to see if there&#39;s something wrong with the sequence.</p> <p>BR, -H</p><div style="clear:both;"></div>