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28335 Experimenter Kit Problem

Brad T
Prodigy 70 points

Other Parts Discussed in Thread: CONTROLSUITE

Hello,

I just recently purchased a 28335 Experimenter Kit and I'm having some trouble seeing signals on the headers on the board.  I'm running an example file that is changing the duty cycle of EPWM1. When I measure pin 23 on the experimenter board (not on the header but on the bottom of the board) I see the PWM signal.   Also,  I can run the same code on my peripheral explorer kit with no problems.  First question is are the pins mapped one to one to the headers?   Second, I started with header pin labeled 33 (the first header pin nearest the USB connector) and started measuring header pins all reference to the ground near the 3.3V 4 pin header.  All of the header pins measure 3.3V.  Is the dock defected?  Do I need to set a jumper? 

  • 0
    Guru 192875 points

    Hi Brad,

     First question is are the pins mapped one to one to the headers?

    No, not one to one. Provision is given to not all but most of the important pins. The docking station has the respective nomenclature for GPIOs and ADCs.

    Second, I started with header pin labeled 33 (the first header pin nearest the USB connector) and started measuring header pins all reference to the ground near the 3.3V 4 pin header.

    I guess, pull-ups are enabled and hence you're able to notice the logic high. GPIOs have GPxPUD register which is known as GPIO Port x Pullup Disable (GPxPUD) Registers. So you can configure these and set the state accordingly.

    Is the dock defected?  Do I need to set a jumper?

    No, not at all. Do check with rest of the example codes to explore this kit.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    TI__Guru 57255 points

    Brad,

    Take a look at the Experimenter Kit's Docking Station inside controlSUITE (assuming you have it installed):
    \controlSUITE\development_kits\~ExperimentersKits\ExperimentersKit-HWdevPkg\

    On the Docking Station, the silkscreen labels near the main headers denote which GPIO will *usually* be located at that header pin of the Docking Station. For PWM1A on GPIO-00 you should look at the pin labelled 00.

    For any general GPIO, looking at a combination of the F28335 controlCARD schematics and the Docking Station schematics should help you find your pin.


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Prodigy 70 points

    Thanks.  That helped. I went ahead and combined the three files you need to map this out.  I was missing the pcb file of the experiment kit to make sense. That is why in my original question I was asking if the pins were one-to-one with the docking station.  I had the control card pin out and could measure EPWM1A on pin 23 of the control card but when I looked at pin 23 on the dock I wasn't seeing the signal.  Anyway, I'm sure I won't be the only one who will get confused by this, so I went ahead and combined the files for others.

    5342.ti_pin_out_dock.zip