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PICList Thread
'some code please'
1997\03\10@185424 by Bob

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I need someone to help me out with a program. I need two pieces
of code, one which lets me time something acurately for just a short
period of time, and the other to make DTMF tones.

       The first piece of code I need has to be a delay that can be
specified in milliseconds, my PIC 16c84 will be running off a color burst
crystal.

       The second piece of code should make the DTMF tones by letting me
specify the two frequencies that need to be mixed, such a 900 + 1400  or
whatever the tone may be. And yes I do have some DTMF generating chips,
but I prefer not to use them for this project since the PIC could handle
it.

       I would appreciate it if someone could write these two fragments
of code for me because I do not have enough knowledge on the PIC right
now to write it, but I plan on reading whatever is given to me to figure
out how it works.

       Thankyou

spam_OUTdeicideTakeThisOuTspamfia.net

1997\03\10@193514 by Greg Maki

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Bob,

Fast Forward Engineering has a BASIC routine to generate a precise delay
routine. The URL is
http://www.geocities.com/SiliconValley/2499/answers.html#PIC00067.

As for the DTMF code, check out Eric Smith's web page at
http://www.brouhaha.com/~eric/pic/
or
David Thomas' code at http://www.rt66.com/dthomas/pic/dtmf.txt

Hope this helps.

Greg Maki

1997\03\11@212514 by John Doe

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Greg Maki wrote:
>
> Bob,
>
> Fast Forward Engineering has a BASIC routine to generate a precise
> delay
> routine. The URL is
> http://www.geocities.com/SiliconValley/2499/answers.html#PIC00067
>
> Hope this helps.
>
> Greg Maki

Thats a pretty nice program, but it just stumped me further. Mabye its
because I use the Parallax instruction set. If someone could provide
some more help for me I would appreciate it. Again what I am looking for
is a piece of code to make a delay that can be specified in
milliseconds. I fomeone can do this in the parallax instruction set it
would be great. My 16c84 will be running off a colorburst crystal.

Thanks a lot.

.....deicideKILLspamspam@spam@fia.net

1997\03\12@005254 by Andrew Warren

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John Doe <PICLISTspamKILLspamMITVMA.MIT.EDU> wrote:

> what I am looking for is a piece of code to make a delay that can
> be specified in milliseconds. I fomeone can do this in the parallax
> instruction set it would be great. My 16c84 will be running off a
> colorburst crystal.

Sigh...

Ok, here's the code:

   ; WAIT SOME NUMBER OF MILLISECONDS (MORE OR LESS) ON A 14-BIT
   ; PIC RUNNING AT 3.579545 MHZ.
   ;
   ; ENTER WITH THE NUMBER OF MILLISECONDS IN W.

   MSTIMER EQU     [any general-purpose file register]

   WAITMS:

           MOVWF   MSTIMER

   WAITMS1:


           MOVLW   223

   WAITMS2:

           ADDLW   -1
           SKPZ
           GOTO    WAITMS2

           DECFSZ  MSTIMER
           GOTO    WAITMS1

           RETURN

Sorry, but I don't use the Parallax instruction set... Maybe Andy
Kunz will translate it for you.

-Andy

=== Andrew Warren - .....fastfwdKILLspamspam.....ix.netcom.com
=== Fast Forward Engineering - Vista, California
===
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