https://devzone.nordicsemi.com/f/nordic-q-a/77312/re-interfacing-spi-adc-with-nrf52840-spimWould like to interface a SPI ADC – MCP3461 via the nRF52840 serial peripheral interface master with EasyDMA (SPIM). I was not able to find whether or not there is an available external trigger for the data acquisition, that can be driven via the ADCen-USTelligent Community 13Mon, 12 Jul 2021 07:36:46 GMThttps://devzone.nordicsemi.com/thread/319522?ContentTypeID=1Mon, 12 Jul 2021 07:36:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7b6ca40a-310f-4876-a80c-1159a9b94561Karl Ylvisaker<p>Hello,</p> [quote user=""]I was not able to find whether or not there is an available external trigger for the data acquisition, that can be driven via the ADC data ready pin.[/quote] <p>You could do this by using <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fppi.html">the PPI peripheral</a> to connect a GPIOTE in event to the SPIM <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/spim.html?cp=4_0_0_5_24_5#register.TASKS_START">TASKS_START</a>&nbsp;task, to have the external interrupt trigger a transaction start on the SPIM.<br />The PPI peripheral&#39;s fundamentals are demonstrated in <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/nrf_dev_saadc_example.html">the SAADC example</a>, where a TIMER CC Event is connected to a TASKS_SAMPLE sampling task in the SAADC. Whenever the TIMER CC event is generated, the TASKS_SAMPLE is started in the SAADC.<br />The dedicated <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ppi_example.html">PPI example</a> goes a little further, and demonstrates using multiple PPI channels.<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>