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LCD display

 
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deonvds



Joined: 08 Sep 2003
Posts: 6

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LCD display
PostPosted: Thu Sep 23, 2004 1:25 am     Reply with quote
I need to remove and connect a LCD display. The problem is however when I remove the LCD the standard CCS LCD.C code still searches for the LCD and my program hangs. How can I check on startup if the LCD display is fitted or not and then ignore the search for the LCD display.
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Thu Sep 23, 2004 6:08 am     Reply with quote
The problem is here:
Code:

void lcd_send_byte( BYTE address, BYTE n ) {

      lcd.rs = 0;
      while ( bit_test(lcd_read_byte(),7) ) ;


You could put a timeout in there and set a flag indicating the LCD is not available.

You could add a few NOP's and a counter that would allow the routine to bail out after a period of time.

You could rewrite the routine to just give a delay after each byte to ensure the LCD is not busy.

There are probably many other ways as well. The choice is up to you.
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