Hi, I have an RFX900 board and sometimes when I run usrp_fft.py and try to set frequency I get a message at the bottom of the window saying "Failed" or "Failed to set initial frequency".
The PLL chip is programmed via a shift register (SPI) and as far as I know reading from the chip is not possible. One can only write to the PLL chip (ADF4360).
So my question is : where does the "Failed" message come from? What and where is being checked to verify success or fail ?