https://devzone.nordicsemi.com/f/nordic-q-a/55890/nfr52-spi-interface-mfrc522-wrong-read-and-write-regsisterHi, I Implement void WriteRegister and ReadRegister SPI interface with mfrc532 but some time right,some time wrong. Some time i write value in a regsister and i read again it is same value, some time it not same value @@ I have tried implement manyen-USTelligent Community 13Mon, 23 Dec 2019 16:27:07 GMThttps://devzone.nordicsemi.com/thread/226756?ContentTypeID=1Mon, 23 Dec 2019 16:27:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1dd22fc7-6bc9-4160-899c-87e4fc19337aLe Phuong<p><span>Hi, i had fixed.</span><br /><span>Read and write function is true.a Orther my funtion is wrong (((:</span><br /><span>Sorry.</span></p> <div id="eJOY__extension_root"></div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226746?ContentTypeID=1Mon, 23 Dec 2019 15:09:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c4db9caf-0c5d-4c92-92b4-2425b61913c2Vidar Berg<p>Hi,</p> <p>I see you&#39;re de-asserting the chip select pin in your code,&nbsp;are you sure the timing between /CS and transfer start is long enough for this sensor? Maybe you can add a small delay after setting the pin low to see whether it makes any difference.&nbsp;</p><div style="clear:both;"></div>