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Graphic LCD WG12864A HELP

 
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ketron82



Joined: 07 Jun 2010
Posts: 36

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Graphic LCD WG12864A HELP
PostPosted: Mon Jun 07, 2010 10:27 am     Reply with quote
Dear friends,
I am an italian student and in the past I have found more very good info in this forum!!

Now....I need your help.

I have bought a a GLCD WG12864A and I think that it working with a KS0108 controller.
This is the datasheet: http://doc.chipfind.ru/pdf/winstar/wg12864a.pdf

So....I have downloaded the GLCD.C library and I have changed the port in this way:
Code:
#ifndef GLCD_C
#define GLCD_C

#ifndef GLCD_WIDTH
#define GLCD_WIDTH 128    // Used for text wrapping by glcd_text57 function
#endif

#define ON  1
#define OFF 0

#define YES 1
#define NO  0

#ifndef GLCD_CS1
#define GLCD_CS1 PIN_D3   // Chip Selection 1
#endif

#ifndef GLCD_CS2
#define GLCD_CS2 PIN_D4   // Chip Selection 2
#endif

#ifndef GLCD_DI
#define GLCD_DI  PIN_D0   // Data or Instruction input
#endif

#ifndef GLCD_RW
#define GLCD_RW  PIN_D1   // Read/Write
#endif

#ifndef GLCD_E
#define GLCD_E   PIN_D2   // Enable
#endif

#ifndef GLCD_RST
#define GLCD_RST PIN_D5   // Reset
#endif
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void glcd_writeByte(char chip, BYTE 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_b(data);            // Put the data on the port
   output_high(GLCD_E);       // Pulse the enable pin
   delay_us(2);
   output_low(GLCD_E);

   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
BYTE glcd_readByte(BYTE chip)
{
   BYTE 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);

   input_b();                 // Set port d to input
   output_high(GLCD_RW);      // Set for reading
   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(2);
   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);
   return data;               // Return the read data
}



and this is the MAIN function:

Code:


#include "C:\Documents and Settings\Administrator\Dati applicazioni\PICC\Projects\main.h"
#include "C:\Documents and Settings\Administrator\Dati applicazioni\PICC\Projects\glcd.c"

void main()
{
delay_us(1000);
   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_CLOCK_DIV_2);
   setup_psp(PSP_DISABLED);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);


glcd_init (ON);
delay_us(1000);
glcd_fillScreen (0);

glcd_line(0, 0, 100, 60, 1);

}



I have simulated the compiled (main.hex) with PIC SIMULATOR IDE and it drawing correcly the line on GLCD.
I have controlled the pin of my PCB and all pin is right....but I can't see the line (or other pixel) on the GLCD....!
I have also connected Vee to GND with a potentiometer and the central pin of the potentiometer is connected to Vo (100k ohm).
Matching the potentiometer I can see the 128x64 pixel but i cannot see a line or other pixel on.

1) The RESET of the WG12864A is active with low voltage....is this the problem!!
2) Is the C code Right??
3) Is the library right for WG12864A GLCD??
4) The delay time is right??
5) How can i initialize my GLCD without library in simple mode for test??
6) PLEASE HELP ME ;)

Sorry for my very bad english and for the grammatical errors
Fabio Patriarca
IZ0CBG
ketron82



Joined: 07 Jun 2010
Posts: 36

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PostPosted: Mon Jun 07, 2010 11:35 am     Reply with quote
Anyone that can help me??
balmer



Joined: 31 May 2010
Posts: 6

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PostPosted: Mon Jun 07, 2010 1:07 pm     Reply with quote
Your graphic LCD is of the backlight type, I guess.
Have you driven current betwen the backlight pins of the display ?

pin 19 Anode
pin 20 katode

Salutti
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jun 07, 2010 1:16 pm     Reply with quote
Quote:
1) The RESET of the WG12864A is active with low voltage....is this the problem!!

The Reset pin is an output from the LCD. It shows the status of the
power-up internal initialization of the LCD. A low level indicates that
initialization is done, and the LCD is ready to accept commands. So
a low level is good.
ketron82



Joined: 07 Jun 2010
Posts: 36

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PostPosted: Mon Jun 07, 2010 1:17 pm     Reply with quote
balmer wrote:
Your graphic LCD is of the backlight type, I guess.
Have you driven current betwen the backlight pins of the display ?

pin 19 Anode
pin 20 katode

Salutti


Many thanks for the reply....
I have connected the Anode and Katode correctly.....with a 100 ohm resistor and the LED is turned on.
Any idea??

Thanks...Fabio
balmer



Joined: 31 May 2010
Posts: 6

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PostPosted: Mon Jun 07, 2010 2:26 pm     Reply with quote
The Reset pin is an input of the LCD.

You must set pin ...

output_high(GLCD_RST);

if not done, LCD will be set on reset status.
ketron82



Joined: 07 Jun 2010
Posts: 36

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PostPosted: Mon Jun 07, 2010 2:44 pm     Reply with quote
Thanks PCM and BALMER....
the initialization of the glcd.c library that I downloaded is:

Code:


// Inputs:        The initialization mode
//                OFF - Turns the LCD off
//                ON  - Turns the LCD on
// Date:          5/28/2003
void glcd_init(int1 mode)
{
   // Initialze some pins
   output_high(GLCD_RST);
   output_low(GLCD_E);
   output_low(GLCD_CS1);
   output_low(GLCD_CS2);

   output_low(GLCD_DI);                // Set for instruction
   glcd_writeByte(GLCD_CS1, 0xC0);     // Specify first RAM line at the top
   glcd_writeByte(GLCD_CS2, 0xC0);     //   of the screen
   glcd_writeByte(GLCD_CS1, 0x40);     // Set the column address to 0
   glcd_writeByte(GLCD_CS2, 0x40);
   glcd_writeByte(GLCD_CS1, 0xB8);     // Set the page address to 0
   glcd_writeByte(GLCD_CS2, 0xB8);
   if(mode == ON)
   {
      glcd_writeByte(GLCD_CS1, 0x3F);  // Turn the display on
      glcd_writeByte(GLCD_CS2, 0x3F);
   }
   else
   {
      glcd_writeByte(GLCD_CS1, 0x3E);  // Turn the display off
      glcd_writeByte(GLCD_CS2, 0x3E);
   }

   glcd_fillScreen(OFF);               // Clear the display
}



I think that the RST pin is set correctly yet.
no??
If the code is correct....the GLCD don't work again.
In the PIC SIMULATOR IDE Software....the GLCD draw a line but no circle and no text.

But I have one question....if the RST pin is an output of the LCD...I have to set it as an input for the PIC??

Many Thanks
Fabio
ketron82



Joined: 07 Jun 2010
Posts: 36

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PostPosted: Mon Jun 07, 2010 6:18 pm     Reply with quote
I have found an error on my GLCD.C. Changing PORT I have understood to change this in the read function:
Code:
 
 data = input_d();

in
Code:
 
 data = input_b();

because I use PORT B as data.

So...I have tested hex in PIC Simulator IDE and NOW.....it draw circle etc.
The problem is that programming the 16f877a....my REAL GLCD won't work.
Nothing of nothing :(

Please....some one can help me??

Thanks
Fabio
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