Forum Post: CC2530ZNP SPI communicatio problem ,Z-stack 2.5.1

Hello, 

I have a wierd spi problem when i try to communicate width cc2530znp chip, my mcu is pic18f4620, hardware spi (tried software SPI, tried pull up, poll down, put the serial resistor in line MI, change mcu to 18f45k22,  the problem remains) 

I'm trying to initialize cc2530 by hardwer reseting it an then reading the poll msg from it, chip responds with caotic data, like it is tree stating MI data line.

Sometimes initialization proces goes well, I configure the cc2530znp, and can send and receive ower the air msg, but this is in a very rare case..

Attached are scope traces.

First spi byte ok

Spi read error

any suggestions what to do?

BR,

Franjo