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GLCD whit PIC18F8720

 
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a.fava



Joined: 25 Jun 2004
Posts: 17
Location: Cremona (Italy)

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GLCD whit PIC18F8720
PostPosted: Mon Jul 12, 2004 2:12 pm     Reply with quote
Embarassed
HELLO,

I have Had The charge to Modify An Equipment Equipped With A Microcontreller Card Based On the PIC18F8270 With Clock @ 20 MHz.
I Should add to it a graphics LCD Display.
I have effected some tests; the result has not been satisfactory.
The GLCD is of the Cristalfontz Mod. CFAG12864B-TMI-V.
Trying with program of example of the CCS-C compiler - EX_GLCD.
The graphic objects is visible, accompanied by pixel they ignite and they extingished in random mode.
The image is very bad.
Is someone able to give me help?
Escuse me my bad english.
konradb
Guest
I use this display OK
PostPosted: Wed Jul 14, 2004 2:35 pm     Reply with quote
I use the same display OK.
There are some timing problems with the CCS driver.
Add the delays below.


Code:

// Purpose:       Write a byte of data to the specified chip
// Inputs:        chipSelect - which chip to write the data to
//                data - the byte of data to write
glcd_writeByte(int8 chip, int8 data)
{

   if(chip == GLCD_CS1)       // Choose which chip to write to
      output_high(GLCD_CS1);
   else
      output_high(GLCD_CS2);

   output_low(GLCD_RW);       // Set for writing
   output_d(data);            // Put the data on the port
delay_us(2);
   output_high(GLCD_E);       // Pulse the enable pin
   delay_us(2);
   output_low(GLCD_E);
delay_us(2);
   output_low(GLCD_CS1);      // Reset the chip select lines
   output_low(GLCD_CS2);

}


// Purpose:       Reads a byte of data from the specified chip
// Ouputs:        A byte of data read from the chip
int8 glcd_readByte(int8 chip)
{
   int8 data;                 // Stores the data read from the LCD
   if(chip == GLCD_CS1)       // Choose which chip to read from
   {
      output_high(GLCD_CS1);
   }
   else
   {
      output_high(GLCD_CS2);
   }
   set_tris_d(0xFF);

   delay_us(2);  //added delay
   output_high(GLCD_RW);      // Set for reading
   delay_us(2);   //added delay
   output_high(GLCD_E);       // Pulse the enable pin
   delay_us(2);
   output_low(GLCD_E);
   delay_us(2);
   output_high(GLCD_E);       // Pulse the enable pin
   delay_us(6);
   data = input_d();          // Get the data from the display's output register
   output_low(GLCD_E);
   output_low(GLCD_CS1);      // Reset the chip select lines
   output_low(GLCD_CS2);

   set_tris_d(0x00);

   return data;               // Return the read data
}

a.fava



Joined: 25 Jun 2004
Posts: 17
Location: Cremona (Italy)

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PostPosted: Mon Jul 19, 2004 1:25 pm     Reply with quote
Very Happy

Hi Konradb,
thank you for the informations you gave me.
They've been very usefulad i solved my problem.
I expected it was a matter of timing and i started some tests.
Your reply saved me a lot of precious time.
Thank you again.

Alessandro
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