AD9364 register access using SPI

Mtz on Nov 8, 2021

Hello,

I am using AD-FMCOMMS4 board with NEXYS VIDEO board. I am at early stage of prototyping for a design. I am trying to access the registers of the AD-FMCOMMS4 using spi.

For now I am not using the no-OS drivers, I am sending the correct SPI signals (SPI_EN,SPI_CLK,SPI_DI,SPI_DO)according to the timing diagram and documentation, but I am unable to read anything back.

Is running the initialization routine needed before attempting to access the registers using SPI? or AM I missing a step?

Thanks
-Motaz

there was a type in the question
[edited by: Mtz at 2:21 PM (GMT -5) on 10 Mar 2022]

Top Replies

Mtz Nov 10, 2021 in reply to ADIApproved +1

Hi Andrei,

Thanks for reply. There is a mention of gpio resetb in the following document: https://www.analog.com/media/cn/technical-documentation/user-guides/AD9364_Reference_Manual_UG-673.pdf

and it says…
travisfcollins
Feb 3, 2022 in reply to AbeSteez +1 verified
Based on your posts you are just looking at the reset logic and not fully bringing up the device. The driver is ~10k lines of C code and not really something you could replicate in fabric alone. We cannot…
Mtz Feb 4, 2022 in reply to travisfcollins +1 verified

The goal is not to duplicate the c code in fabric. The design I have on the NEXUS VIDEO contains a CPU so I can write c code on it. so before integrating the no-OS driver into our programming flow I wanted…

Parents

0 ADIApproved

on Nov 9, 2021 10:05 AM
Hello,

It is a good idea to follow the steps in the driver. Make sure that the reset GPIO is correctly driven for the task - I believe it has to be low - and do a software reset before reading the ID register. It seems that these are the only necessary steps to get sign of life from the part.

Regards,
Andrei
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 AbeSteez on Feb 3, 2022 4:50 PM in reply to ADIApproved

Are you suggesting that it's possible to develop control system for the AD9364 (using the FMCOMMS4 and a supported FPGA) with custom digital logic, just basing the behavior on the no-os drivers?

I've been interested in doing this, but have really only heard discouragements from ADI's support up until now, making me believe it's not feasible.
Cancel
Up 0 Down

Reply

Verify Answer

Cancel

Reply

0 AbeSteez on Feb 3, 2022 4:50 PM in reply to ADIApproved

Are you suggesting that it's possible to develop control system for the AD9364 (using the FMCOMMS4 and a supported FPGA) with custom digital logic, just basing the behavior on the no-os drivers?

I've been interested in doing this, but have really only heard discouragements from ADI's support up until now, making me believe it's not feasible.
Cancel
Up 0 Down

Reply

Verify Answer

Cancel

Children

No Data