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Display problem in GLCD without FAST_GLCD

 
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tigiyko



Joined: 05 Dec 2011
Posts: 3

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Display problem in GLCD without FAST_GLCD
PostPosted: Mon Dec 05, 2011 3:29 am     Reply with quote
Hello everyone;

İ'm using 18f452 at 20MHZ for driving 128x64 Graphic LCD, and my compiler's version is 4.120. Here is datasheet of glcd;

http://www.lehan-intl.com/pdf/17-LH12864A-2.pdf

İ can drive my glcd without any problem with fast_glcd function. But when try to drive it without fast_glcd function, characters in glcd are engaging and it doesn't display properly.

Does anyone have an idea?
tigiyko



Joined: 05 Dec 2011
Posts: 3

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PostPosted: Mon Dec 05, 2011 5:04 am     Reply with quote
i found the solution. According to brand of glcd, time of responses change. For example the glcd which i'm using has 25ns rising and fall time. İf you dont add delay after enable and cs signal, glcd's controller couldn't catch mcu's speed. İ added delays which marked with *** symbols.

Code:
void glcd_writeByte(int1 side, BYTE data)
{
   set_tris_d(0x00);
   
   output_low(GLCD_RW);       // Set for writing
    if(side)                   // Choose which side to write to
      output_high(GLCD_CS2);
   else
      output_high(GLCD_CS1);

    delay_us(1);

   output_d(data);            // Put the data on the port
   delay_us(1);
   output_high(GLCD_E);       // Pulse the enable pin
   delay_us(1);
   output_low(GLCD_E);
   
   delay_cycles(5); // ***i added this delay
   output_low(GLCD_CS1);// Reset the chip select lines
   delay_cycles(5); //*** i added this delay
   output_low(GLCD_CS2);
}
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