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DVD Player Control Logic

SensivaSensiva Junior Member
in AMX General Discussion
Hi all..

I am doing practical for Programmer Certificate, and now i am stuck with the control logic of the DVD Player, actually i am not that much familiar with standalone players, so here is logic assumptions that I built on my own. :o

- STOP will be ON if there is a media inserted and no transport actions
(no media --> STOP is OFF)
- Transports are disabled while in MENU
- changing discs will stop (STOP is ON) and exit MENU
- Pausing while playing -- PLAY will remain ON
- PLAY & PAUSE will exit SEARCH
- SEARCH is latching command
- searching will turn PLAY ON
- searching while paused will exit PAUSE
- PLAY will turn OFF both PAUSE and SEARCH
- MENU command pauses playback
- SELECT will start playback
- skipping will not turn OFF STOP
- skipping will start playback only if the player was playing back OR PAUSED
(turning off pause as well)
- skipping will exit SEARCH

I am not asking for code, I want only someone to validate this logic specially the latching searching buttons, i don't want AMX University's Cops get me out of the track :eek:
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Comments

  • NMarkRobertsNMarkRoberts Junior Member
    The complexity of the rules you have laid out and the assumptions you have to blindly make only demonstrate that it's best not to even try to guess what a DVD is doing when you are controlling it without feedback. If you have state feedback, you don't need all those rules; if you don't have state feedback, you can never be sure what it is doing.
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  • SensivaSensiva Junior Member
    Feedback
    NMarkRoberts wrote:
    If you have state feedback, you don't need all those rules; if you don't have state feedback, you can never be sure what it is doing.

    This is a RS232 DVDPlayer, and it has only two major responses
    - Media Type in the drive.
    - valid or invalid command acknowledgment
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  • mpullinmpullin Obvious Troll Account, Marked for Deletion
    NMarkRoberts wrote:
    The complexity of the rules you have laid out and the assumptions you have to blindly make only demonstrate that it's best not to even try to guess what a DVD is doing when you are controlling it without feedback. If you have state feedback, you don't need all those rules; if you don't have state feedback, you can never be sure what it is doing.
    Brilliant answer, I should have used that on my test :p
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