LCD Timing issues

kv9r · Joined: 09 Jun 2007 Posts: 3

I have two MAVRIC-IB ATmega128 boards that connect to a 128X64 LCD the program uses the glcdKS108.lib.
The board I initially developed the program on has a 14.7456Mhz clock everything works correctly the 8X8 font, 16X16 font, line draw, circle draw and even showpic graphics.
I connected my other board which has a 16.0000Mhz clock.
The display was intermittent there were extra dots and lines at random locations.
I realized that I had not changed the $crystal = 14745600 to $crystal = 16000000 after doing so the display was better but still had random dots and lines.
I then changed $crystal = 16000000 to $crystal = 18000000 and everything worked flawlessly.
This showed me that it was a timing issue writing to the LCD.
Changing the $crystal is not an expectable solution, there must be a better way to change just the read/write timing for the LCD.
Thanks Dyan...

Frankeman · Joined: 11 Aug 2004 Posts: 948 Location: the Netherlands

Hi, and welcome to this friendly forum.

You can change the "glcdks108.lib"
Search for lines like "@genus(5)"
Increment the 5 to add more delay.

Frank.

kv9r · Joined: 09 Jun 2007 Posts: 3

Thanks Frank
That worked perfectly Razz

Dyan...