The odd things had to do with the limitations of CCS C, not really with
anything else, and would not apply in assembly language.

Here's how I approached it.

1.  I created a string for line #1 of the display, then printf'ed the string
to the display.

2.  I created another string for the second line of the display, which is
the bar graph, initialized to all blanks.

3.  One of the characters in the LCD character set was a big black
rectangle, which I used to create the bargraph.  You may have a similar
character in the hitachi character set I don't know.  I think it was 0X123
but I forget.

4. Let's say the measurement controlling the bargraph is Y, maybe an analog
input or a timer.  Y ranges from 0 to 255 and there are 8 spots in my
bargraph, so Y has to change 255/8 or 32 for each character in the bargraph.
YMMV (Your Math May Vary)

5.   Divide Y by 32, this is the number of bars lit, say it's called
NumBars.

6.   For (j = 0 to NumBars)   {String[j] =  0X123;}

7. then print this string to the display.

That's the easy part.  The hard part is doing this all in assembler.  ;-)
If you are doing anything this complex, consider getting a C compiler and
learning it, it will save you gobs of headscratching time.

--Lawrence Lile







----- Original Message -----
From: "cflat" <cflat@mail.ev1.net>
To: "Lawrence Lile" <llile@toastmaster.com>
Sent: Monday, March 04, 2002 11:53 AM
Subject: Re: Re: Bar graph code?


>
> Hi Lawrence,
> Thanks for the reply.  I am using a standard interface with the
> Hitachi chip.  I am doing this in assembly but if you had to do
> some odd things to make it work, it might be helpful to look at
> your C code.  Any help is appreciated.  Thanks again!
> Charles
>
> ---------- Original Message ----------------------------------
> From: "Lawrence Lile" <llile@toastmaster.com>
> Reply-To: "Lawrence Lile" <llile@toastmaster.com>
> Date: Mon, 4 Mar 2002 08:12:53 -0600
>
> >I've done this on a scott edwards serial LCD, are you using that
> type? or
> >some Hitachi interface?
> >
> >I did it on CCS C.  Had to resort to some odd tricks to get it to
> work.
> >
> >If any of this would be useful to you lemme know.
> >
> >--Lawrence
> >
> >
> >----- Original Message -----
> >From: "Dale Botkin" <dale@BOTKIN.ORG>
> >To: <PICLIST@MITVMA.MIT.EDU>
> >Sent: Sunday, March 03, 2002 3:06 PM
> >Subject: Re: Bar graph code?
> >
> >
> >> On Sun, 3 Mar 2002, cflat@ev1.net wrote:
> >>
> >> > Hi all,
> >> > I am reading a value (0-5volts) from the A/D on a PIC16F877
> and I
> >> > want to display it as sort of a bar graph along the 2nd line
> of the
> >> > 2X16 LCD display to show a relative strength indication.  Does
> >> > anyone know of any code out there already?  I just thought
> I'd ask
> >> > before I reinvent the wheel.
> >>
> >> I don't have any code per se, but it's a very, very small
> wheel...
> >>
> >> Your ADC output will be 10 bits, from 0 to 1023.  Shift it to
> the right
> >> six times (divide by 64) and you have the number of block
> characters or
> >> whatever to print on your LCD.  Of course if you're using the
> ADC in 8-bit
> >> mode, just use the upper 4 bits for the number of blocks to
> print.  Heck,
> >> I could even do that in assembly!  8-)
> >>
> >> Dale
> >>
> >> --
> >> http://www.piclist.com hint: PICList Posts must start with ONE
> topic:
> >> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,
> [AD]: ->Ads
> >>
> >>
> >
> >
>
>
> ________________________________________________________________
> Sent via the EV1 webmail system at mail.ev1.net
>
>
>
>

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