https://devzone.nordicsemi.com/f/nordic-q-a/10174/spi-interfacing-of-nrf-51822-and-rfid-readerHello, i would like to interface nrf51822 with an rfid reader mfrc522 using SPI.So, i went through the example of spi_master in SDK 8.1.0.How can we access the value of a register in mfrc522,as the NRF SPI code is not that easy to understand.Is thaten-USTelligent Community 13Mon, 28 Jan 2019 06:42:56 GMThttps://devzone.nordicsemi.com/thread/168132?ContentTypeID=1Mon, 28 Jan 2019 06:42:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:82ee967f-cb33-4a51-a7c0-19bac9c745c7Manjunath G<p>where did you get mfrc522.h and mfrc522.c files? if you have,please give the link of that.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/37726?ContentTypeID=1Wed, 11 Nov 2015 14:02:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a32dc900-0287-4adc-94ec-9cd21cbd836dPetter Myhre<p>The spi_master is the <a href="http://developer.nordicsemi.com/nRF51_SDK/nRF51_SDK_v8.x.x/doc/8.1.0/s110/html/a00051.html">SPI Master Loopback Example</a>.</p> <p>I believe the <a href="http://developer.nordicsemi.com/nRF51_SDK/nRF51_SDK_v8.x.x/doc/8.1.0/s110/html/a00052.html">SPI Master Example to be used with SPI Slave Example</a> is a better starting point.</p> <p>Anyways, both of these use the <a href="http://developer.nordicsemi.com/nRF51_SDK/nRF51_SDK_v8.x.x/doc/8.1.0/s110/html/a00012.html">SPI Master driver</a>.</p> <p>After initalization and configuration, you can see from the documentation it uses spi_master_send_recv() to send and receive data.</p> <p>When data transmission has ended successfully the SPI_MASTER_EVT_TRANSFER_COMPLETED event is received by the spi_master_event_handler().</p><div style="clear:both;"></div>