pulse simulation

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  1. - 13th August 2006, 15:52 #2
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    Acetronics2
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    Lightbulb Darrel instant interrupts ... of course !!!

    Hi, Nicolas

    Use DT interrupts !!! ... it's not so difficult to use.

    http://www.picbasic.co.uk/forum/showthread.php?t=3251

    or a little trick I discovered :

    insert " DEFINE INTHAND _INC" at the top of the program ... This places a "GOTO _INC" at location 00004 of the ASM program.

    Now trim the interrupt register ( INTCON) to allow an " interrupt on PortB Change "

    Place a correct preset value for W0 ... 0 is not a good value !!! ( in "decr:" nor !!! )

    Place a "GOTO PULSE " before "inc"

    Think to re-enable interrupts, placing " INTCON.7 = 1" just past "pulse" label

    last, change "GOTO inc" to "GOTO pulse"

    That should go at first...

    Next step will be to use BUTTON instead of IF-THEN ... just to use the Auto-repeat feature ...


    One more step ...

    Have a look to Motorola ( yessss ... Freescale !!! ) "TPUPN xx" Application Notes ...

    really Great !!!

    http://www.bgsoflex.com/megasquirt.html


    Alain
    Last edited by Acetronics2; - 13th August 2006 at 16:23.
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