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MMWCAS-RF-EVM: Hardware triggering frames to sync radar with a stepper motor drive

Robin Wnuk
Prodigy 30 points
Part Number: MMWCAS-RF-EVM
Other Parts Discussed in Thread: MMWCAS-DSP-EVM, , LMK00804B

Tool/software:

Hi there,


I'm trying to synchronise the radar with an external source (SIEMENS S7-1200 using digital outputs; 24 V). We want to do precise measurements for MIMO SAR applictions using the MMWCAS-RF-EVM + MMWCAS-DSP-EVM. Therefore, we are looking for a way to trigger single chirps or frames after a specific number of pulses that we back from the stepper motor drive system.


What we found is that hardware triggering instead of software triggering might be possible. Is soldering a wire to U8 LMK00804B on the MMWCAS-RF the only way to externally trigger a chirp or frame, or is there a dedicated connector that can be used for this specific task of externally triggering the setup? If so, are there any other hardware modifications that need to be made? Does the data acquisition using the MMWCAS-DSP-EVM also need to be modified or does it work the same as software triggering the frames? How do we set the hardware triggering mode in the configuration of the sensor?

Kind regards,
Robin

  • 0
    TI__Mastermind 21460 points

    Hi Robin,

    Hardware triggering is done by rising edge of pulse in SYNC_IN pin and there is no other alternative. AWR2243 Cascade (Rev. B)

    Robin Wnuk said:
    Does the data acquisition using the MMWCAS-DSP-EVM also need to be modified or does it work the same as software triggering the frames?

    Changes are not needed in MMWCAS-DSP-EVM. MMWCAS-DSP-EVM is responsible for controlling MMWCAS-RF-EVM and receiving captured IF ADC samples. 

    Robin Wnuk said:
    How do we set the hardware triggering mode in the configuration of the sensor?

    You can set TRIGGER_SELECT field in AWR_FRAME_CONF_SET_SB to 2, so that each frame is triggered by rising edge of pulse in SYNC_IN. rlSetFrameConfig API is used to configure the frame.

    Refer to "C:\ti\mmwave_mcuplus_sdk_04_06_01_02\mmwave_dfp_02_02_04_00\docs\mmWave-Radar-Interface-Control.pdf"

    Regards,

    Samhitha