Interfacing 128x64 graphical LCD to PIC16F877A with CCS PICC example

An Overview Of Graphic LCD With KS0108 Controller

Graphic LCD commonly found in electronics equipment, comes with various sizes. It's actually a dot matrix display, made from tiny crystal points with display driver and controller. There are many different part numbers of display driver and controller.

An industrial standard ks0108 dot matrix graphic LCD controller. Currently there are many controller IC compatible with this one. This chip is embedded in a graphic LCD module with an 8-bit parallel port interface with some additional control pins. It could be found from any online store such as E bay or Amazon around 7 US Dollars. 

A RT12864J-1 graphical LCD module

It comes with 20 pins connection.

Pin diagram of KS0108 LCD Module

One KS0108 controller could drive 64 segment. Thus to get 128 segments they put two KS0108 controller IC. As we can see, we have two chip select pin for these two segments driver IC. Another common driver used for driving its common pins. It's KS0107 common driver. KS0107 could drive up to 64 common pins of the dot matrix.

C Programming And Interfacing With PIC16F877A

Many C compiler such as MikroC and CCS PICC develop a library for this controller IC. CCS PICC is fast and efficient. In this example, I use PIC16F877A to interface with a 128x64 LCD module controlled by KS0108/KS0107 IC.

Schematic Diagram. The LCD module in Proteus different in pin outs.
But it functions the same to the physical hardware.

The overall program just show the power up time of the system that being run by PIC16F877A.

#include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#define GLCD_CS1     PIN_B0   
// Chip Selection 1
#define GLCD_CS2     PIN_B1   
// Chip Selection 2
#define GLCD_DI      PIN_B2   
// Data or Instruction input
#define GLCD_RW      PIN_B3   
// Read/Write
#define GLCD_E       PIN_B4   
// Enable
#define GLCD_RST     PIN_B5   
// Reset
#define xOffSet 25
#include <HDM64GS12.c>
#include <graphics.c>


void main() {
   char txt1[]="Start Up Time:";
   char timeString[15];
   int timeCounter=0;
   int second=0;
   int minute=0;
   int hour=0;  
   glcd_init(ON);  
   glcd_text57(23,15,txt1,1,ON);
   while(1){
      /* Get time in second*/
      second=timeCounter;
      if(second>60){
         minute+=1;
         timeCounter=0;
         
      }
      if(minute>60){
         hour+=1;
         minute=0;
      }
      if(hour>24) hour=0;
      /*convert number to string data*/
      sprintf(timeString,"%u:%u:%u",hour,minute,second);
      /*Clear the old value using a mask rectangle*/
      glcd_rect(23,25,120,40,YES,OFF);
      /*Show the time text string*/
      glcd_text57(23,25,timeString,2,ON);            
      delay_ms(1000);
      timeCounter+=1;
   }
}

The simulation screen shot

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ATMega16 ATMega32 Experiment Board PCB from PCBWay

 

We can the ATMega32 micro-controller to interface with this graphical LCD module. Check this link for more information.