Setting profiles with different sample rates on RX and TX

Hi Peter, please see similar question below:

(+) ADRV9002 does not allow different sample rates for RX1 and TX1 - Q&A - Linux Software Drivers - EngineerZone

Best, -Stefan

OK thank you

Ok i've managed to get CMOS profile to export. (after a lot of pain... It's mostly change something, pray TES GUI doesn't crash and try. But mostly restart TES because it crashed)
I have the RX sample rate set to 20MHz with channel bandwidth set to 15MHz and NCO set to 9926MHz (seems random but that was the maximum value i could set before TES crashed)
On TX i have a sample rate of 1.25MHz with channel bandwidth of 31.25kH and no NCO.
My problem now is that the TX gain (attenuation) is stuck at -40dB. It won't budge. I've tried changing it using iio_attr problem and osc (iio oscilliscope) and it looks to be immutable. Any idea why this is happening ?

EDIT: after a reboot it seems to have fixed itself. Any idea why a reboot would unblock the TX gain? What triggered it in the first place?

You're using an old version of TES we don't officially support. Presumably you will be able to switch to new one soon. Installing different TES versions in different local folders could clarify any installation issues.

Regarding Tx gain, why does your oversampling (1.25MHz / 31.25kHz) have to be that high? I would have to check with design, but my guess is that that could cause reduction in max amplitude you can get.

-Stefan

Hi Stefan,

We are currently using a version of Kuiper Linux which is tied to an API version which is tied to TES v 0.26. Maybe if i update everything then i'll be able to use latest TES.
I could possibly set the TX rate down to 31.25kHz too but i have a feeling TES crashed when i did so. I could try again if you believe this should work.

Hi Peter,

If you venture into building Linux yourself, you may use 2023_R2 branch with the very latest TES:

linux/drivers/iio/adc/navassa/devices/adrv9001/public/include/adi_adrv9001_version.h at 2023_R2 · analogdevicesinc/linux 

Though in TES26, setting following Tx sample rate/bw combinations seem to be valid: 125kHz/31.25kHz; 250/31.25; 375/31.25; 625kHz/31.25kHz. Hope that helps.

-Stefan

Ok thank you.

It looks like rebooting the board unstuck the TX gain. I don't know what caused this. I have seen this before when experimenting with profiles.