https://devzone.nordicsemi.com/f/nordic-q-a/13592/i2c-in-nrf51-dkhello there i want to send negative acknowledgement then what should i do?? like i want to send some data and then i want to send negative acknowledgementen-USTelligent Community 13Mon, 02 May 2016 01:46:22 GMThttps://devzone.nordicsemi.com/thread/51842?ContentTypeID=1Mon, 02 May 2016 01:46:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e3c2ace5-2f17-462b-9a79-850682eb2876RK<p>If you are a master sending data then you don&#39;t send ACKs or NACKs, the slave sends them to tell you it received the data. If you are a master receiving data then you send ACKs to keep the slave sending or one NACK at the end to stop it, that one is generated for you by the hardware automatically. In fact they all are, so you can&#39;t generate a NACK yourself nor do you need to.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/51841?ContentTypeID=1Sun, 01 May 2016 21:42:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6b2374d6-ff8b-487e-8953-27140a429ef4wlgrd<p>Per my understanding you do not send a NACK, you just don&#39;t send the ACK. Like, if a slave device does not respond, that is essentially a NACK (not acknowledged)</p><div style="clear:both;"></div>