https://devzone.nordicsemi.com/f/nordic-q-a/4044/nrf24le1-input-status-changed-very-slowlyvoid io_init(void) //P0 input with inner pull up. { P0DIR = 0xFF; P0CON = 0x50; P0CON = 0x51; P0CON = 0x52; P0CON = 0x53; P0CON = 0x54; P0CON = 0x55; P0CON = 0x56; P0CON = 0x57; } void TX_Mode(void) { SPI_RW_Reg(WRITE_REG + CONFIGen-USTelligent Community 13Fri, 10 Oct 2014 14:41:26 GMThttps://devzone.nordicsemi.com/thread/14511?ContentTypeID=1Fri, 10 Oct 2014 14:41:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f1055a8c-bbb0-419f-a8bd-21ea5b09f01bsam<p>thanks , it seems the wake up time make the problem</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/14510?ContentTypeID=1Fri, 10 Oct 2014 12:31:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4b9934d7-582b-4fa8-b61a-65724f80aaddAsbj&#248;rn<p>Are you keeping track of the button pushes and updating the TX_FIFO with the correct payload as soon as possible? It sounds like the status of the pins isn&#39;t reflected to the TX payload soon enough. Are you sure you actually receive a packet every second? Could it be that you are missing some packets on the receiver side? Add a counter to the packet to ensure that you are in fact receiving them all.</p><div style="clear:both;"></div>