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LCD needs too much time

 
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Spitzer

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

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PostPosted: Sun May 03, 2009 9:38 pm    Post subject: LCD needs too much time Reply with quote

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
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DToolan

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Joined: 14 Aug 2004
Posts: 1384
Location: Dallas / Fort Worth, Texas (USA)

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PostPosted: Sun May 03, 2009 10:42 pm    Post subject: Reply with quote

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

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Joined: 11 Aug 2004
Posts: 945
Location: the Netherlands

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PostPosted: Sun May 03, 2009 11:11 pm    Post subject: Reply with quote

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.
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Luciano

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Joined: 29 Nov 2004
Posts: 3149
Location: Italy

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PostPosted: Mon May 04, 2009 9:09 am    Post subject: Reply with quote

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
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Spitzer

Bascom Member



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

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PostPosted: Tue May 05, 2009 11:32 am    Post subject: Reply with quote

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