ADAQ4001 Cant get the SPI communication to work

Hello,

I am a beginner with the programming of microcontrollers and SPI communication and have some problems with the ADAQ4001 Evaluation Board.

I am planning to use the ADAQ on a custom board, but for a first test I am using the ADAQ Evaluation Board with a STM32 Nucelo Board.

The two Boards are connected with Jumper-Cables and therefore i have reduced the clock rate to roughly 300kHz.

For a first test I am just trying to read the Register of the ADAQ4001 and I am already running into problems.

I looked up the required timing from the Datasheet and it should look like this:

To check my software, i have a logic analyzer connected to the board.

The output waveform of my µC looks like this:

As far as i have understood the datasheet, the ADAQ should output the register values on the SDO line.

But for some reason there is no SDO Data from the ADAQ Board. The Pull-Up resistor for the SDO line is activated.

I have checked the power rails of the board and they look ok.

When i cycle the power to the ADAQ then there are sometimes random signals on the SDO line.

Can someone help me with the problem?

I am grateful for any tips.

Best regards,

Dennis