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PGA900: GUI saves FIFO data

Amy Luo
Expert 6895 points
Part Number: PGA900

Hi team,

Is the TXT. file saved after clicking READ FIFO in PGA900 GUI the data after AD conversion of pressure channel? Does it correspond to the data in PADC DATA register? How to understand the data in the TXT file?

  • +1
    TI__Mastermind 31655 points

    Hello Amy,

    The trace FIFO captures 2048 samples of the selected channel when it is enabled. The data in the text file shows the sample number in the second column, and the data in the third column from LSB first to MSB. It is 32bit addressed, so the 4th data byte will always be unused (since 24 bits is the max size of the data). The first column is unused.


    Regards,

  • 0 in reply to Scott Cummins
    TI__Expert 6895 points

    Hi Scott,

    Thank you very much. I have one more question though. Is the ADC converted data stored in PADC DATA1-3,

    Because  in section 7.3.21.6.2 trace FIFO described "the pga900 software development RAM can also be used as trace FIFO. The trace feature allows either P ADC value or T ADC value to be stored in the development RAM for post-processing" 

    However, in section 7.3.10 P analog to digital converter describes "The P analog to digital converter is used to digitize the voltage output of the P gain amplifier. The digitized value is available in PADC_DATA1-3 registers."

    So, I don't know where to read the conversion results through the digital interface.

  • +1 in reply to Amy Luo
    TI__Mastermind 31655 points

    Hello Amy,

    The latest conversion is available in the PADC_DATA1-3 registers. The FIFO (when enabled) allows previous values to be stored for later access. You can access the data through either method, but for the most recent conversion, the data is available in the PADC_DATA registers.


    Regards,