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MMWCAS-RF-EVM: Does this have an external trigger output once it starts framing?

Toan Vo Dai
Prodigy 10 points
Part Number: MMWCAS-RF-EVM
Other Parts Discussed in Thread: MMWCAS-DSP-EVM

Hello,

With the MMWCAS-RF-EVM evaluation board, is there any trigger output when it starts framing so I can synchronize it with other sensors/DAQ?

THanks

  • 0
    TI__Guru*** 147854 points

    Hi,

    Yes, the frame can be triggered through SW or HW pulse.

    Please see Table 5.27 and related notes

    C:\ti\mmwave_dfp_02_04_00_01\docs\mmWave-Radar-Interface-Control.pdf

    Thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 10 points

    Hi, 

    I think you misunderstood my questions. I am asking if there are any ways the system (MMWCAS-RF-EVM with MMWCAS-DSP-EVM) can OUTPUT a signal/pulse through the GPIO upon the transmitting of the FIRST chirp pulse or frame. This is NOT the same as controlling the triggering of the system via an external pulse.

    Reason for this is that I want to use this system to measure human heart rate and I want to synchronize it with an external ground truth heart sensor. Hence, after the system sends the first chirp, it would be ideal if it can send out a pulse, which would then trigger a the data acquisition on the ground truth heart sensor as my reference.

    Thanks,

  • 0 in reply to Toan Vo Dai
    TI__Guru*** 147854 points

    Hi,

    Thank you for the additional information.

    This is not possible. The cascade system does not have this capability

    Thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 10 points

    Can you give me specific instruction on how we can trigger the frames using Hardware Pulses?

  • 0 in reply to Toan Vo Dai
    TI__Guru*** 147854 points

    There are two things to consider

    1) Sw configuration

    The RF front end configuration must be modified

    Table 5:30, SUB_FRAMETRIGGER must be set to 1

    C:\ti\mmwave_dfp_02_04_00_01\docs\mmWave-Radar-Interface-Control.pdf

    I checked the matlab configuration code

    C:\ti\mmwave_studio_03_00_00_14\mmWaveStudio\MatlabExamples\4chip_cascade_MIMO_example\utils\cascade_json_parser\JsonParser.m

    I don't see the frame trigger field being used. So probably the default value is used.

    2) hw pulse trigger

    For the spec for the shape of the pulse, please see Table 5.27 and related notes

    C:\ti\mmwave_dfp_02_04_00_01\docs\mmWave-Radar-Interface-Control.pdf

    Please find similar threads by using google site search as follows

    "site e2e.ti.com hw trigger"

    https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/709500/iwr1642-question-about-hw-trigger

    "site e2e.ti.com hw trigger mmwcas"

    Thank you

    Cesar