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Last Post 16 Oct 2007 12:09 PM by  messenger
status indicator lights on the 5329EVB
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mcelweep@msoe.edu
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23 Aug 2007 11:59 AM
    Is it possible to disable the status lights from blinking? We decided to tie a buzzer to the uP_status1 line and it makes a lot of noise when it is in lolo.
    paulc@logicpd.com
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    27 Sep 2007 09:32 PM
    I imagine you could you could use the "w" command to drive the signal but I think lolo will keep setting it back. at reset the pin is tri-stated so maybe there's a way to put it back in that mode and keep lolo from using it as an output but not sure.

    Check section 2.11 of the hw guide:

    http://www.logicpd.com/do..._MCF5329_HW_Spec.pdf
    kurtl@logicpd.com
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    29 Sep 2007 08:25 AM
    pmcelwee13,
    I am pretty sure Lolo reads the STATUS_1,2 state then inverts them to create the toggling LEDs.

    One way you could prevent this is use a lolo script at boot up to temporarily disable the GPO latch until your software begins running. This is done by driving the "MFP9 - TIN3/TOUT3" (CPU TIN3/TOUT3 pin) signal high.

    Once your software starts up you can initialize the latch to your prefered state, then drive "MFP9 - TIN3/TOUT3" low again.

    -K
    messenger
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    16 Oct 2007 12:09 PM
    Hey, sorry for not getting back earlier. It turns out that we can't use the GPIO latch for both output and input because of opto - isolators (spelling?) and such. So we moved the output GPIOs to PWM outputs that are driven at 100 % although I supposed we could vary them to get different buzzer / LED intensities.

    Edit: I guess I have a couple different user names on here?!?! Man its been a while.
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