https://devzone.nordicsemi.com/f/nordic-q-a/25143/why-isn-t-my-ppi-spi-channel-triggered-with-gpioteHello, I would like to detect a change in a pin( GPIO_IN_NUMBER ) and depending on it I would like to trigger a SPI transaction, this should happen through PPI. So far I have configured my PPI in this way, is there something faulty on this settingen-USTelligent Community 13Fri, 15 Sep 2017 07:29:06 GMThttps://devzone.nordicsemi.com/thread/99037?ContentTypeID=1Fri, 15 Sep 2017 07:29:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c2e53e26-7a26-4eac-95c6-e08414af691bMartinBL<p>Hi,</p> <p>I see three things:</p> <ol> <li>You need to enable GPIOTE with <code>nrf_drv_gpiote_init();</code> at the top of your code.</li> <li>You need to enable the internal pullup resistor with <code>configHighToLow.pull = NRF_GPIO_PIN_PULLUP;</code>. Otherwise the pin might always be low.</li> <li>You have probably confused yourself with the naming of your variables. <code>gpiote_Transition_task_addr</code> is the <em>event</em> when you push the button. <code>spi_start_evt</code> is the <em>task</em> to start the SPI transfer. So if you switch these two variables in <code>nrf_drv_ppi_channel_assign()</code> it should work.</li> </ol><div style="clear:both;"></div>