https://devzone.nordicsemi.com/f/nordic-q-a/12051/redbearlab-ble-shield-arduino-nrf24l01-moduleHello, I&#39;m using thhe BLE shied, which uses the nRF8001 chip, with arduino Mega. I&#39;m trying to connect the Rf module nRF24l01 to receive data from another arduino and send them via bluetooth to mobile APP. I&#39;m having troubles with the SPI communicationen-USTelligent Community 13Wed, 24 Feb 2016 11:32:17 GMThttps://devzone.nordicsemi.com/thread/45636?ContentTypeID=1Wed, 24 Feb 2016 11:32:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:90fdb0c8-d88c-4052-bc40-ded3fffc11d0run_ar<p>Unfortunately I don&#39;t have any code examples for this. But I guess you could simply check the status of the other CS pin before you lower the one you want to use. Another option would be to use a mutual command and event queue, so you always know there is only one ongoing transaction.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/45635?ContentTypeID=1Tue, 23 Feb 2016 18:42:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2a88f041-ef75-46ab-a471-a688bcf4a620RenatoLacerda<p>Thank you very much for your answer. Do you have any code example to implement for sharing the two devices using the chip select line??</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/45634?ContentTypeID=1Tue, 23 Feb 2016 10:02:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4dd62220-9b61-474d-8f59-aca79b036ffbrun_ar<p>Both devices can share SPI lines as long as they have their own separate chip select line (REQN for the nRF8001). Just make sure that these lines are newer asserted simultaneously and that the rest of the lines are kept in a defined state.</p><div style="clear:both;"></div>