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AWR1843: LVDS output with two different number of chirp in the frames.

Hitoshi Sugawara
Mastermind 19980 points
Part Number: AWR1843

Hi Experts,

Is it possible to transfer the LVDS data when the number of the chirp in the frame is changed every 1 frame as follows?
I would like to know the configuration for LVDS if it is possible.

Odd Frame:
    ADC Sample Number : 256
　Chirp per Frame : 256

Even Frame:
　ADC Sample Number : 256
　Chirp per Frame : 128

Does it work if the settings below is utilized for LVDS?
　ADC Sample Number Setting : 256
　Chirp per Frame Setting : 256

Thank you for your kind help.
Best regards,
Hitoshi

  • 0
    TI__Guru 69960 points

    Hi Hitoshi-San,

    For the given configuration, condition is equivalent to advanced frame configuration where each next sub-frame has different no. of chirps.

    I would recommend referring mmw demo (xWR18xx) from mmWave SDK 3.3 which provides an option to stream out ADC data over LVDS (lvdsStreamCfg CLI CMD).

    Use profile_advanced_subframe.cfg and edit lvdsStreamCfg to enable LVDS streaming for all the sub-frames.

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    TI__Mastermind 19980 points

    HI Jitendra,

    According to the customer, they knew the method with subframe control.
    They would like to make it with not using subframes.

    Am I making sense?

    Thank you for your kind help.
    Best regards,
    Hitoshi

  • 0 in reply to Hitoshi Sugawara
    TI__Guru 69960 points

    Hi Hitoshi,

    If not using subframes (means not using advFrameConfig), that means you need to use legacy frame config. In this case, with infinite set of frame: all the consecutive frame will have same sample size and chirp count till you change it.

    If application triggers single frame instead of long set of frame count then after every one frame is over (recieved sensor-stop async-event), an application needs to invoke rlSetFrameConfig API to change the sample size and chirp count then trigger the frame (rlSensorStart). With this flow LVDS data will be streamed with different sample size at every new frame configuration.

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    TI__Mastermind 19980 points

    Hi Jitendra,

    Thank you for your clarification.

    Best regards,

    Hitoshi