Re: Power Shutdown..

From: James (wireless_at_tampabay.rr.com)
Date: 06/17/04

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    Date: Thu, 17 Jun 2004 20:39:27 GMT

    Rushi wrote:
    > Power Shutdown..
    >
    >
    > Currently my system has AC-DC industrial Power supply and on/off power
    > switch.
    > I have a R-W partition on which I write my data all the time. When
    > some one switch off the system it just goes down without proper
    > software shutdown.
    >
    > I would like to implement a pushbutton which can switch on and switch
    > off the system. Specifically on switch off it should unmount all the
    > drives and shutdown it self.
    >
    > Am I right to say; I need both ATX computable board and Power supply
    > to do this , or is there any other way of doing it.
    >
    > I am using right now AT PC104+ stack, which has ACPI but not ATX.
    >
    > Actual goal is to bring the system down properly and not by just
    > cutting of the power so it don't damage the drive and data on R-W
    > partition.
    >
    >
    > Any decent solution????
    >
    >
    > Cheers
    >
    >
    > Rushi

    I'd connect the pushbutton switch to a transistor, so one of your
    Digital IO lines can be monitored for a 'soft_swithch'. Upon
    activation of this soft_switch, you would write a bit to a register.
    Another piece of code would read the status bit out of the register
    and use it to determine that you need to run

    umount *
    sync;sync;sync;reboot

    or what ever you want. Upon reboot, you need to clear this status bit
    outof the register.

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