https://devzone.nordicsemi.com/f/nordic-q-a/15727/how-to-tell-when-a-spis-transaction-is-grantedI am trying to implement a REQ line protocol over GPIO to signal to the Master when it is ok to receive data. Basically, I want to pull the REQ line high when the nrf51 has something to send to the master, I then want to pull the REQ low as soon as theen-USTelligent Community 13Mon, 15 Aug 2016 08:23:44 GMThttps://devzone.nordicsemi.com/thread/60019?ContentTypeID=1Mon, 15 Aug 2016 08:23:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ade2cd59-9f9f-4013-86e4-df312ec734b1Stefan Birnir Sverrisson<p>Hi</p> <p>I suspect you could set up GPIOTE channel with the CSN pin and connect it to another GPIOTE channel that is set up with the REQ pin. Connect the GPIOTE channels with PPI. An example how to connect GPIOTE with PPI is in the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/nrf_gpiote_example.html?cp=6_0_0_4_5_7">gpiote example in the SDK</a>.</p><div style="clear:both;"></div>