CCS / AWR1243： lua configuration and calibration method for 2 chip cascade

Hi,

After doing the following changes (RadarDevice = {1, 1, 1, 1} to {1, 1, 0, 0} and local start_chirp_tx = 0 is set to 6) in the Cascade_Configuration_MIMO.lua script, were you able to capture data for just two devices? Did you try to capture data manually or using the Cascade_capture.lua script?

Regards,

Ishita

Hi Ishita,

Yes, We did capture data from 2 chip cascade.
For the Cascade_capture.lua script, we did more change (line delete) and used it.

but it means,
  local Inter_Frame_Interval = 100-- ms
  local nchirp_loops = 64-- Number of chirps per frame
has not been changed.
I think that tx within Frame_Interval = 100ms will be halved by raising start chirp tx, but it has not changed from 64.

Will the number of chirps sended by one of six TX ANTs increase compared to 4 chip(3x4=12 TX ANTs)?
Or will the "no-chirp" time when the chip is not output increase?
If the "no-chirp" time increase, Is the signal lost in the RX circuit in the IC?
Or will the RX circuit also have a “wait”?

Or please tell me any other good methods for 2 chip cascade.

Regards

user6072736, Igarashi

Hi Igarashi-San,

All these configurations are destined for individual devices (master/slave). So using even 2 chip instead of 4-chip won't affect the configuration to each of the devices. In this LUA script each devices are configured to have their own settings,

Studio should able to configure the 2 Chip cascade board as well, please try to configure the device manually (not LUA script).

Regards,

Jitendra

Hi Jitendra-san,

Thank you for your answer.

Sorry for my poor understanding,
Do "configure the device manually (not LUA script)" mean using a GUI?
With GUI, 2-chip cannot be selected.

I ask from another point of view, in this case,
can't always necessarily say wrong to set with LUA script?

Hi,

I meant to use GUI only. You can select no. of AWR device (master/slave) from the checkbox selection on the left panel in the GUI.

I don't understand the last question about LUA script, could you please elaborate?

Regards,

Jitendra

Hi Jitendra-san,
Thank you for your answer.
Let me add to the last question.

I have read your instructions carefully, but have no specific mentions that would result in unintended settings when using lua.
Isn't it wrong to set it with LUA script? (not GUI)
Regards,

Hi,

I assume that with GUI you are able to work with your 2-chip cascade board.

At my end LUA script works with those changes even I select only 2 chips out of 4-chip cascade board.

I am still not clear what exactly error you see with LUA execution with the above said changes.

Regards,

Jitendra

I will try GUI according to your advice.
Then, please tell me next question.
① Is there any update of description in e2e.ti.com/.../856206 (Nov 21, 2019) ?
And, I heard from my coworker that even 4chip-CAS cannot perform GUI-based antenna CAL.
② Is it possible to antenna calibration by GUI for 4chip-CAS ?
③ Is it possible to antenna calibration by GUI for 2chip-CAS ?

Tool versions we use is as follows :
  mmwave_studio_02_01_00_00
      mmwave_sdk_02_01_00_04     (not newest)
       mmwave_dfp_01_02_05_01

Hi Jitendra-san,

Now I am trying with mmw-studio based on GUI.
Perhaps I could set device configuration but not capture data.
But I concern red letters remain in the current tab display (image file attach). Is this OK?

If ok, please tell us other possible causes.

Regards,
user6072736, Igarashi

Hi,

For this setup, you can ignore the red text 'RS232 Connectivity Status: DIsconnected'. That is required in SOP-2 mode only, but with Cascade board you work in SOP-4 mode (functional mode).

And glad to know that you are able to make it work for 2cas.

Regards,

Jitendra

Hi Jitendra-san,

Since the history of the question has been prolonged, I will organize the situation.
Our initial aim was 2cas, but it only works on lua base and asked e2e if this setting was reasonable.
The advice from Jitendra-san was based on a GUI.
But, in e2e's article, 2cas doesn't seem to work on a GUI basis.
So, following the advice from Jitendra-san, I tried using 4cas and GUI based.
I tresed user guide, but eventually 4cas dosen't work capture.

In other words, now it is 4cas, not 2cas.
further I heard from my coworker that even 4chip-CAS cannot perform GUI-based antenna CAL.
Therefore I Asked three questions:
Q1 Is there any update of description in e2e.ti.com/.../856206 (Nov 21, 2019)?
Q2 Is it possible to antenna calibration by GUI for 4chip-CAS ?
Q3 Is it possible to antenna calibration by GUI for 2chip-CAS ?
After that, I asked additional questions about the red text 'RS232 Connectivity Status: DIsconnected'.

Please tell us the answer of Q1-Q3 again.

Regards,

user6072736 said:

Q1 Is there any update of description in e2e.ti.com/.../856206 (Nov 21, 2019)?

Update to this thread: mmwave studio v2.1 can support 2-chip cascade connection.

user6072736 said:

Q2 Is it possible to antenna calibration by GUI for 4chip-CAS ?

mmWave Studio provides a reference calibration data of cascade hardware for MIMO (calibrateResults_dummy.mat) and BF (phaseMismatchCalibration.mat) which is captured with cascade board at our end. It is recommended to capture this calibration data at user end. (mmwave_studio_cascade_user_guide: section 8.3.2.2)

user6072736 said:

Q3 Is it possible to antenna calibration by GUI for 2chip-CAS ?

As mentioned above there is no fully automated way to do the calibration but manually it can be done using mmWave Studio, follow the cascade_user_guide.

Regards,

Jitendra