----- Original Message -----
From: "Jamey Schroeder" <jamey-schroeder@HOME.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, September 04, 2000 1:23 PM
Subject: [PIC] PIC16F84 -Data Memory Question, reading/erasing


> I've been experimenting with the pic for about a month or so.  Currently I
> am trying to set up serial communications with a pc at 9600bps.  I have
been
> successful in sending more the one byte of data to the pic and having it
> store the data into eeprom.  I'm not happy with the way I had to write the
> code.  The way I have it set up now is when you send the first byte of
data
> to the pic it puts it into a register for use as a counter.  The first
byte
> tells the pic how many more bytes are coming.  When it recieves the
> following bytes it stores them into memory.  I had to use several goto and
> subroutines in order to get this to work, I have a seperate routine for
> every byte location.  I have it set up so it can recieve a maximum of 8
> bytes.  I would like to have one routine for the whole job.
>
> I was wondering if there is a way to have a loop where the data location
to
> store the data is incremented so that I can shorten my code.
>
> I guess for starters what I would want to do is clear an area of my Data
> Memory.  I want to specify the number of bytes to clear and where to
start.
> If I had a loop to do that I could probably use the same concept for
storing
> data into memory.
>
> Does anyone have any ideas on this?




How about if you use something like this:


    Store first byte as bytecount variable
    Store last used memory location as lastmem variable

DoItAgain:
    get next byte
    store it in (lastmem - bytecount)+1
    decfsz bytecount (decrement bytecount and skip next command if zero)
    goto DoItAgain
    Goto Finished


















































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