https://devzone.nordicsemi.com/f/nordic-q-a/37741/nrf24l01-stop-stateDear Nordic Semi, I play with NRF24L01+ shield and, what I control using STM32F411RE or ADuCM4050. Once a while, NRF24L01+ chip stops and on the MISO line with permanent 0xFF value. To be precise, each SPI transaction NRF24L01+ should return content ofen-USTelligent Community 13Thu, 23 Aug 2018 18:41:55 GMThttps://devzone.nordicsemi.com/thread/145569?ContentTypeID=1Thu, 23 Aug 2018 18:41:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c750144b-2e8a-4624-8651-a8f2563039b9Kenneth<p>Hello,</p> <p>You should use a 100ms delay after power ON before you read and write to the nRF24L01. You may also try to pull CE low and write 0 the PWR_UP bit in the config register. Other than that I don&#39;t have any good suggestion, since I have not heard of this situation before. I guess it&#39;s always a possibility to control VDD through a transistor to power cycle the nRF24L01 from the MCU to recover also.</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>