Thread: LCD controller interface

Hi everyone! Am new here, but need some urgent help and opinions. We have a section of code supplied by one of our lecturers to use with LCD displays, however in a University project I need to use a different screen. I am using a Display Tech 20x4 dot matrix display, which uses a "KS0066U" controller, however the supplied code works only for Hitachi HD44780 controller LCD. Is there any way to adapt the following code to be able to make this LCD work? Or will I have to start from scratch/ scrap the project? Thanks for looking

Code:

#include <pic.h>
/*  cLCD.c - Write a String to a 4 Bit Hitachi 44780 LCD I/F

This Program Initializes Hitachi 44780 Based LCD in 4 Bit Mode
  and then writes a simple string to it.  The simulator was used
  to time delay values.  

RC3:RC0 - LCD I/O D7:D4 (Pins 14:11)
RC4     - LCD E Clocking Pin
RC5     - LCD R/S Pin

*/
__CONFIG(INTIO & WDTDIS & PWRTEN & MCLRDIS & UNPROTECT \
  & UNPROTECT & BORDIS & IESODIS & FCMDIS);

int i, j, k, n;                 //  Use Global Variables for Debug

//                         1234567890123456
const char TopMessage[] = "    Who am I     ";
const char BotMessage[] = "  Tom Page   ";

#define E  RC4                  //  Define the LCD Control Pins
#define RS RC5

const int Twentyms = 1250;      //  Declare a Constant for 20 ms Delay
const int Fivems = 300;
const int TwoHundredus = 10;

LCDWrite(int LCDData, int RSValue)
{

    PORTC = (LCDData >> 4) & 0x0F;  //  Get High 4 Bits for Output
    RS = RSValue;
    E = 1;  E = 0;              //  Toggle the High 4 Bits Out

    PORTC = LCDData & 0x0F;     //  Get Low 4 Bits for Output
    RS = RSValue;
    E = 1;  E = 0;              //  Toggle the Low 4 Bits Out

    if ((0 == (LCDData & 0xFC)) && (0 == RSValue))
        n = Fivems;             //  Set Delay Interval
    else
        n = TwoHundredus;

    for (k = 0; k < n; k++);    //  Delay for Character

}  //  End LCDWrite

main()
{

    PORTC = 0;                  //  Start with Everything Low
    CMCON0 = 7;                 //  Turn off Comparators
    ANSEL = 0;                  //  Turn off ADC
    TRISC = 0;                  //  All of PORTC are Outputs

//  Initialize LCD 
    j = Twentyms;
    for (i = 0; i < j; i++);    //  Wait for LCD to Power Up

    PORTC = 3;                  //  Start Initialization Process
    E = 1;  E = 0;              //  Send Reset Command
    j = Fivems;
    for (i = 0; i < j; i++);

    E = 1;  E = 0;              //  Repeat Reset Command
    j = TwoHundredus;
    for (i = 0; i < j; i++);

    E = 1;  E = 0;              //  Repeat Reset Command Third Time
    j = TwoHundredus;
    for (i = 0; i < j; i++);

    PORTC = 2;                  //  Initialize LCD 4 Bit Mode
    E = 1;  E = 0;
    j = TwoHundredus;
    for (i = 0; i < j; i++);

    LCDWrite(0b00101000, 0);    //  LCD is 4 Bit I/F, 2 Line

    LCDWrite(0b00000001, 0);    //  Clear LCD 

    LCDWrite(0b00000110, 0);    //  Move Cursor After Each Character

    LCDWrite(0b00001110, 0);    //  Turn On LCD and Enable Cursor

    for (i = 0; TopMessage[i] != 0; i++)
        LCDWrite(TopMessage[i], 1);

    LCDWrite(0b11000000, 0);    //  Move Cursor to the Second Line

    for (i = 0; BotMessage[i] != 0; i++)
        LCDWrite(BotMessage[i], 1);

    while(1 == 1);              //  Finished

}  //  End cLCD

I forgot to add that we all use 16F684 16-pin PIC chips!

Thanks for the reply! Looking at page 6 of the data sheet, I think it starts up in 8-bit mode. What do you think?

Displaytech | Optoelectronics and Displays | Displays | LCD Displays - Alphanumeric | Alphanumeric |204A-CC-BC-3LP

Page 6 of the data sheet also gives the initialisation sequence. Would this match the code shown above? Does anyone have experience of KS0066U controllers and HD44780 controllers? Thanks!