I would like to describe my new project: Raspberry Pi add-on board with radio transceiver CC2520 and st7565 LCD interface.
I connected two devices to one SPI which is available on the main RPi connector.
The radio circuit based on lab11 project: https://github.com/lab11/raspberrypi-cc2520
but I have used bigger resistors and caps. I add a circuit to LCD with st7565 driver which requers only 9 caps.
Now I aim to implement my own character driver for cc2520 that could be easily plug into another program code.