I'm trying to communicate with HMC1197. I can read Reg00h's value(C7701A). But when I tried to read any other READ ONLY register, like Reg 07h, I got always C7701A.
Following ,is my scope screen-captures when i want to read Reg 07h
I think my SPI waveform is right. In the first cycle, SDI write 0111b(Reg 07h) at r3:r0. But SDO still C7701A.
But unfortunately, there are little help for me.