I have troubles with SPI communication between AD9257 demo board and a zybo board.
For example, I try to read the register 0x01(the chip ID) with this command, but as you can see the ADC doesn't answer...
We check timing spec, and it is OK.
Is there something I missing?
Green ->CLK (around 200kHz)
yellow -> Data (SDO and SDI are connected together )
Blue -> CS
When I disconnect the CS pin, sometimes the ADC answers correctly (like 1 time every 20 requests)
(here, I have removed the CS pin from ADC)