https://devzone.nordicsemi.com/f/nordic-q-a/9080/spi-problemHI : I am trying to use spi to communicate with a slave device . The slave device only have 3 interfece SDIO SCk NCS. I need to read the register of the slave . According to the datasheet,first i need to send the register address to SDIO ,and delay foren-USTelligent Community 13Mon, 07 Sep 2015 10:25:10 GMThttps://devzone.nordicsemi.com/thread/33420?ContentTypeID=1Mon, 07 Sep 2015 10:25:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aa980a63-7cdc-445a-8473-110722358d03MartinBL<p>Hi</p> <p>What slave device are you using? I have never heard of anyone doing this, but maybe you can configure your nRF51&#39;s SPI with MOSI line on a particular pin and transmit your data. Then stop and reconfigure your SPI with MISO on the same particular chip.</p> <p>Otherwise you can always do it in software (bitbanging) and you can generate a 1MHz clock using a timer. Note that bitbanging can get quite complex if you are going to do it with a Softdevice running concurrently.</p><div style="clear:both;"></div>