Unfortunately, I didn't write the CPLD code, so I can't share it... It
belongs to a client. Sorry about that!

Harold

>
> Harold,
>
> I could use something like this for a project coming up soon.
> Would it be asking too much to ask if you would allow me to
> Copy your CPLD setup and the accompanying code to use in my project?
> You can email your responses to me offline at projects@jpes.com.
> I'll use this address so your response will be easy to find.
>
>
> 						Thanks and Regards,
>
> 							 Jim
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Harold Hallikainen
> Sent: Wednesday, April 25, 2007 10:18 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] 128x64 graphics LCD interface
>
>
>>
>>   OK, so what about just sending a character....say....A.  I suppose
>> thats what the graphics libraries such as ramtec supplies, in that you
>
>> say send an A and it sends out the page, and then the column address
>> to 'turn on' the pixels.  So each 'character' is a subroutine thats
> called?
>>  Or is there a easier method....or has someone else done this before,
>> maybe not for this controller but another one.  I think Scott D was
>> doing something with font experiments but I don't recall what
>> controller or resolution he was using.  I was thinking for a graphic
>> module interface you would end up needing alot of RAM not flash to do
> this?
>
>
> I have a project with a PIC24H driving a CPLD that interfaces to a RAM
> and a graphic display. To the PIC, it looks like an external RAM. I can
> set up an address corresponding to a position on the screen, then read
> or write that address. The CPLD autoincrements to the next pixel
> position (including from the end of one line to the start of the next).
> I have a C function that draws a character. The start of my font table
> includes the X and Y size of the character, then the bit pattern for
> each character. I used the Character Set Extractor at
> http://www.piclist.org/techref/datafile/charset/extractor/charset_extrac
> tor.htm
> . My DisplayCharacter function pulled the pixels from the table and
> output them to the LCD, dropping to the next line at the right edge of
> the character. I have a couple global variables that define the
> foreground and background colors that are used to draw the characters.
> At the end of drawing the characters, the CPLD is set to the top left
> corner of the next character so I can just feed them one after another
> to print strings. The function also allows for different character sets
> (especially different sizes), which is why I put the Xsize and Ysize at
> the start of the table.
>
> Harold
>
>
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