Joined: 30/05/2014 22:08:56
The SPI bus is shared between the Memory and the RFM22 radio.
It is important that the chip select on the Memory is NOT enabled simultaneously with the radio. I believe this is most likely the issue you are seeing.
The chip select on the Memory is the MCU gpio D5 (common between all the MiniWireless). Please make sure D5 is de-asserted while performing radio operations.
You can explicitly set this to a logic HIGH, or by configuring the internal pullup---such that, the memory won't interfere with radio operations.
Let me know if you have any further questions, and although we are quite busy, we are willing to help.