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Original question:

AWR1642: How to read GPADC data out?

AWR1843: Read GPADC without chirping

Sebastian Brueckner
Intellectual 395 points
Part Number: AWR1843

Hi all,

we can read the GPADC values by enabling the appropriate monitor and getting an async event after the monitor has run - after e.g. one radar cycle.

We need to implement an idle mode where the radar is not chirping (to converse power). Is it possible to still get data from the GPADC? 

Best regards

Sebastian

  • 0
    TI__Guru*** 147964 points

    Hi

    The GPADC can perform only ONE MEASURE / Frame during the Frame Idle Time.

    When the frames are stopped, you can measure the GPADC more often.

    Thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 395 points

    Hi Cesar,

    here is my new understanding of how the different GPADC APIs work:

    rlSetGpAdcConfig() can be used to start an AD conversion while the sensor is not chirping. One async message will be generated per function call. To continuously monitor an external voltage, the API has to be called periodically.

    While the sensor is chirping, rlSetGpAdcConfig() can not be used (?). Instead rlRfExtAnaSignalsMonConfig() and rlRfAnaMonConfig() are used to enable one AD conversion per monitoring time period. It is not possible to read the GPADCs more than once per monitoring time period.

    Is this understanding correct? Are there any other ways to access GPADC values that I missed?

    Thanks!

  • 0 in reply to Sebastian Brueckner
    TI__Guru 58035 points

    Hello Sebastian,

    rlSetGpAdcConfig() can be used once the BSS is powered up. It can be used while frames have not been triggered or frames have been triggered, either cases will work. Once the frames have started the temperature read will happen only during the inter frame time, not while an active chirp is ongoing. Also when frames are started this API is updated only once is a frame.

    Regards,
    Vivek