https://devzone.nordicsemi.com/f/nordic-q-a/52744/nrf24l01-reset-register-valueshi everyone, i&#39;m trying to read the register values in nrf24l01+ since i need to use nrf as radiocontroller. Due to the fact i couln&#39;t write any bit on registers i tried to check if my functions were the main problem, so i tried the read function. I noticeden-USTelligent Community 13Mon, 07 Oct 2019 20:38:21 GMThttps://devzone.nordicsemi.com/thread/213748?ContentTypeID=1Mon, 07 Oct 2019 20:38:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:727604cf-3b41-4c59-9baf-2b8f7d00490bpaolo lucantonio<p>i solved the problem, it seems that ZYNQ injected too much current in the clock pin, so inserting a 1Mohm resistor in series between zynq pin and nrf one solved the problem, now i can properly write/read (the arduino provides a 12Mohm resistance in the clock pin while the zynq 300kohm)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/212867?ContentTypeID=1Tue, 01 Oct 2019 17:32:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ca118a0-8c47-4187-83e0-f6c057fe594dpaolo lucantonio<p>the status register is read correctly since is sent as 00001110 as the datasheet says, the problem is that i can neither write 1 the pwr_up to make the nrf to go on stand by mode nor reading correctly other registeres, for example today i tried several times to read the 0x01 register and instead of 00111111 there was written 00000000; tomorrow as i&#39;ll go in lab i try to send a picture of the logic analyzer screen; if can be of any help i can also share code written in sdk</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/212810?ContentTypeID=1Tue, 01 Oct 2019 12:21:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:30274be2-8d99-4569-8e55-9f36ece8b7c8Kenneth<p>Can you share a plot of csn, sck, mosi and miso when for instance reading the STATUS register.</p> <p>The plot need to be detailed enough to see each of the 16 clock cycles for the command(1byte) + data(1byte). Should be similar to figure 26 in datasheet (but that figure show 1 more byte than you need to read STATUS register):</p> <p><a href="https://infocenter.nordicsemi.com/pdf/nRF24L01P_PS_v1.0.pdf?cp=8_4_0_0">https://infocenter.nordicsemi.com/pdf/nRF24L01P_PS_v1.0.pdf?cp=8_4_0_0</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/212784?ContentTypeID=1Tue, 01 Oct 2019 10:41:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:938ed067-be80-406e-a792-20c1bda27228paolo lucantonio<p>yes i checked and they should be correct as i can see; almost every register has a strange value printed in the logic analyzer like the freqeuncy register that has 00000000 as result, i hope not to be so unlucky that i wrote a wrong function that casually returns me the correct value of config register and a few more.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/212782?ContentTypeID=1Tue, 01 Oct 2019 10:39:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a1419a8b-2e96-4e5a-9471-013a76665c00Kenneth<p>What registers differ? Have you checked with a logic analyzer that the SPI commands (read and write) is as shown in the datasheet of the nRF24L01+?</p><div style="clear:both;"></div>