I'm confused about the function of PBCONTROL.  Is that an input
pin or an output pin?  The Low command will automatically make it
an output.

If you're looking more for a "While button = pushed, do this" type
command, you want a "While PORTB.x = 0...Wend" statement.

One more point- you really need to learn, use and love GoSub and
Return.  Really.  Really.  Constant Goto hopping is a good way to
end up in a padded room.

I know you don't want to hear this, but assembly code is the only
way to really know what PIC programming is all about.  With the
16F series, you have less than 40 commands to learn.  If you don't
have a book, you need to get one.  I'd suggest the Peatman books.

Mike H.


>Related Setup Code
>-----------------------------
>'set timer
>  option_reg = %11011000          'set TMR0 to internal clock
>
>'set variables
>RND   VAR WORD                   'set RND as variable
>
>Problem Subroutine
>----------------------------
>PB3SUB:
>   Low PBCONTROL                  'turn off PB's
>   Low GLED                             'turn off Green LED
>   High RLED                            'turn on Red LED
>   RND=TMR0                           'load TMR0 into RND
>   Random RND                        'randomise RND
>   RND = (RND // 31) + 1           'returns a number between 1-31
>   For LOOP1=1 TO (RND*1000) 'pause for RND secs
>   Next LOOP1
>   RND=TMR0                           'load current TMR0 into RND
>(different
>value)
>   Random RND                        'randomise RND a 2nd time
>   Low RLED                            'turn off Red LED
>   RND = (RND // 31) + 1           'returns a number between 1-30
>   IF RND>=15 Then
>   GoTo PB1SUB                     'if RND is higher than mid point run PB1
>sub-routine
>   Else
>   GoTo PB2SUB                     'if RND is lower than mid point run PB2
>sub-routine
>   EndIF
>   GoTo MAIN
>
>Note
>-------
>The above subroutine currently runs to the end of line two and then hangs
>until
>the button is released (which is odd as the first line turns off the push
>button.......unless it cycles through so quickly it is sampling the button
>state
>again before it is released).
>
>If I 'rem' out all the lines that relate to 'RND' or 'Random' and add a
>delay
>between 'High RLED' and 'Low RLED' the red LED comes on for the duration of
>the
>delay (this leads me to believe my problem lies with either my method of
>trying
>to read the value of TMR0 or with the 'Random' command.
>
>If anyone can shed any light on this or suggest a way of achieving my goals
>I
>would appreciate the info.

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