AD9986 + ZCU102 Abnomal Work

Hi,

Sorry, I got confused with this project, it appeared similar to another one and I thought we have this one in our repository, but we don't.

The problem comes from the unrecognized chip ID which says there is no 9986, because you used the AD9081-FMCA-EBZ boot files, and the device tree for this is not expecting an AD9986 evaluation board. This is my assumption, but I am not sure regarding the software side.

I will move this thread to the Linux Software Drivers forum for any thoughts from my colleagues, if these are compatible or not, while I check about the HDL.

Best regards,
Iulia

Hi,

Sorry, I got confused with this project, it appeared similar to another one and I thought we have this one in our repository, but we don't.

The problem comes from the unrecognized chip ID which says there is no 9986, because you used the AD9081-FMCA-EBZ boot files, and the device tree for this is not expecting an AD9986 evaluation board. This is my assumption, but I am not sure regarding the software side.

I will move this thread to the Linux Software Drivers forum for any thoughts from my colleagues, if these are compatible or not, while I check about the HDL.

Best regards,
Iulia

You using a very old image:

Linux version 4.19.0-g17f4223

Please reimage your card with the latest image from here:

https://wiki.analog.com/resources/tools-software/linux-software/kuiper-linux

[    6.516639] ad9081 spi1.0: Unrecognized CHIP_ID 0x9986

The driver back then wouldn't support AD9986 ...

-Michael

Hi

In my serial print log, there had two ZCU102 boot processes from two different SD cards. 

First time, the kernal version is the latest.The version 5.4.0-00602-g88b7d86ff997.

Second time, the kernal version is old, 4.19.0-g17f4223. And the card was sent along with your ad9986 evaluation board.

But the two kernals did not recognized CHIP_ID 0x9986.

[    6.501991] ad9081 spi1.0: Unrecognized CHIP_ID 0x9986

[    6.516639] ad9081 spi1.0: Unrecognized CHIP_ID 0x9986

I suspect that the device tree and boot file are wrong. In the SD card of the new kernel, the device tree and boot file are selected as zynqmp-zcu102-rev10-ad9082-m4-l8-vcxo122.88.zip.The file from the website of AD9081/AD9082 Zynq UltraScale+ MPSoC ZCU102 Quick Start Guide [Analog Devices Wiki].

I am comfused about the difference between the ad9082 and ad9986.When i want to find the file of ad9986, i just find the ad9081 or ad9082.

Thanks for the answer.

AD9986 support was added in this commit:

https://github.com/analogdevicesinc/linux/commit/2d77f0129b996f6e438ac3ca8bb2cc76630352f5

It should exist in the 2021_R1 release. Please don't download random outdated files.

Please use the release image or build kernel devicetree yourself.

A summary of different device derivatives can be found on the first page of the user guide:

https://www.analog.com/media/en/technical-documentation/user-guides/ad9081-ad9082-ug-1578.pdf

-Michael

Re-download the latest image, correct device tree and boot file to SD Card.It worked.

Thank you.

Hi

I met a problem.The evaluation board can work nomally, but the sampling frequency of HMC7004 output to ADC was 3Ghz.

--- PLL2 ---
Status: Locked (Synchronized)
Frequency: 3000000000 Hz (Autocal cap bank value: 15)

SYSREF Status: Valid & Locked
SYNC Status: Synchronized
Lock Status: PLL1 & PLL2 Locked

I want to increase the sampling frequency to make bandwidth reach 2GHz. I should use iio software to change sampling frequency by spi command or re-download the appropriate device tree and boot files.

Now, the boot files and system.dtb are from the zynqmp-zcu102-rev10-ad9081-m8-l4 folder. And the system.dtb was copyed from the vcxo122p88 folder.

xinanjied said:

I want to increase the sampling frequency to make bandwidth reach 2GHz. I should use iio software to change sampling frequency by spi command or re-download the appropriate device tree and boot files.

For these parts you can't change the sampling frequency from IIO. It's all done in the devicetree.

The HMC7044 clocks are related, but your bandwidth depends on DAC rates, ADC rates and their interpolation/decimation factors.  

-Michael

Hi

My project is collecting boardband digital sianal processing.Our intermediate frequency is 1.5Ghz and the bandwidth is 2G.

Is there a device tree that can support ADC to sample 6G, decimate it into 2 complex outputs, and the bandwidth can reach 2.4GHz?

If so, where i can download it?

Thanks.

Sorry

My project is collecting boardband digital sianal processing.Our intermediate frequency is 1.5Ghz and the bandwidth is 2G.

Is there a device tree that can support ADC to sample 6G, decimate it into 2 complex outputs, and the bandwidth can reach 2.4GHz?

Is there such a model for us to choose?

Thanks.

I don't think we have such a use case drafted with a devicetree example.

For AD9082 I'm pretty sure you could run ADC at 6G and then use decimate by 2 in the coarse DDC.

That would give you 3G rate which should have 2.4G channel BW.

And you can tune the main NCO to 1.5G.

-Michael 

Can i get the mode that i want by modifying the device tree and boot file?

If so, what should i do?