LCD needs too much time

Spitzer · Joined: 01 Nov 2004 Posts: 2 Location: Vienna, Austria

I have a problem with LCD
Each line needs 20ms. (3 lines = 60ms !!)
the 20ms are measured with oscilloscope

Does anybody know, how I could reduce this time?

Code:
$regfile = "M32def.dat"
$crystal = 4000000
Ddrb.5 = 1 ' Testpin Oscilloscope
Config Lcdpin = Pin , Db4 = Portc.4 , Db5 = Portc.3 , _
Db6 = Portc.2 , Db7 = Portd.7 , E = Portc.5 , Rs = Portc.6
Config Lcd = 16 * 3 , Chipset = Dogm163v5 , Contrast = 118
Cls
Do
Waitms 50 ' 50ms
Portb.5 = 1 ' Testpin
Locate 1 , 1 : Lcd "Hello World....." ' 20ms
Locate 2 , 1 : Lcd "line 2.........." ' 20ms
Locate 3 , 1 : Lcd "line 3.........." ' 20ms
Portb.5 = 0 ' Testpin
Loop
End

DToolan · Posted: Sun May 03, 2009 10:42 pm Post subject:

Use 8-bit data instead of 4-bit data (search the forum and look in the help file for CONFIG LCDBUS).

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

Hi, and welcome to this friendly forum.

You could also use the "LUC_lcd4busy.lib" this library checks the busy flag from the LCD.

Frank.

Luciano · Joined: 29 Nov 2004 Posts: 3149 Location: Italy

Hi,

Here is the lib.

Libray for character LCD modules (Busy flag/random pins)
http://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewtopic&t=4941

Best regards,

Luciano

Spitzer · Joined: 01 Nov 2004 Posts: 2 Location: Vienna, Austria

Thanks Luciano, with your library my LCD works great now.
For a single line I need now about 800µs instead of 20ms.