Interfacing JHD162A LCD Module to micrcontroller

#include <reg51.h>
#include <intrins.h>
sbit dc=0xa0;     /*P2.0 LCD  RS  pin #21*/
sbit rw=0xa1;     /*P2.1 LCD  R/W pin #22*/
sbit cs=0xa4;     /*P2.4 LCD  E   pin #25*/
sfr  lcdbus=0x80; /*p0 LCD data bus D0=P0.0*/
unsigned int sys10mscounter;
unsigned char syslimitcounter;

// Self define font
char path1[8]={0x00,0x1f,0x00,0x1f,0x00,0x1f,0x00,0x1f}; // Horizontal 1
char path2[8]={0x1f,0x00,0x1f,0x00,0x1f,0x00,0x1f,0x00}; // Horizontal 2
char pats1[8]={0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15}; // Vertical 1
char pats2[8]={0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a}; // Vertical 2

void soft_nop(){}

void soft_10ms() // 12MHZ 10MS software delay
{    register int i;
     for(i=0;i<711;i++);
}

void soft_20ms() // 12MHZ 20MS software delay
{    soft_10ms();
     soft_10ms();
}

void hard_10ms(unsigned int delaytime) // delaytime*10MS hardware delay
{    sys10mscounter=delaytime;
     while(sys10mscounter);
}

unsigned char data lcdcounter;
bit lcdusing1,lcdusing2;

bit lcd_checkbusy()  // is LCD busy?
{register lcdstate;
    dc=0; // dc=1 -> data, =0 -> command
    rw=1; // rw=1 -> read, =0 -> write
    cs=1; // cs=1 -> selected
    soft_nop();
    lcdstate=lcdbus;
    cs=0;
    return((bit)(lcdstate&0x80));
}

void lcd_wrcmd(unsigned char lcdcmd) // write a character to LCD
{    lcdusing1=1;
     while(lcd_checkbusy());
     lcdbus=lcdcmd;
     dc=0; // dc=1 -> data, =0 -> command
     rw=0; // rw=1 -> read, =0 -> write
     cs=1; // cs=1 -> selected
     soft_nop();
     cs=0;
     lcdbus=0xff;
     lcdusing1=0;
}

void lcd_moveto(char position) // move cursor to position 0-79
{register cmd=0x80;
     lcdcounter=position;
     if (position > 59)
         position += 0x18;
     else
     {   if (position > 39) position -= 0x14;
         else
         {  if (position > 19) position += 0x2c;
         }
     }
     cmd = cmd | position;
     lcd_wrcmd(cmd);
}

void lcd_wrdata(char lcddata) // at surrent cursor write a character
{char i;
     lcdusing2=1;
     while(lcd_checkbusy());
     if (lcdcounter==20){
        lcd_moveto(20);
        while(lcd_checkbusy());
        }
     if (lcdcounter==40){
        lcd_moveto(40);
        while(lcd_checkbusy());
        }
     if (lcdcounter==60){
        lcd_moveto(60);
        while(lcd_checkbusy());
        }
     if (lcdcounter==80){
        lcd_moveto(0);
        while(lcd_checkbusy());
        lcdcounter=0;
        }
     lcdcounter++;
     lcdbus=lcddata;
     dc=1; // dc=1 -> data, =0 -> command
     rw=0; // rw=1 -> read, =0 -> write
     cs=1; // cs=1 -> selected
     soft_nop();
     cs=0;
     lcdbus=0xff;
     lcdusing2=0;
}

void lcd_string(char *strpoint) // at current cursor write a string
{register i=0;
      while(strpoint[i]!=0){
           lcd_wrdata(strpoint[i]);
           i++;}
}

void lcd_init()  //initialize LCD
{
     lcd_wrcmd(0x38); //8 bit data bus
     lcd_wrcmd(0x0c); //block cursor,non blink
     lcd_wrcmd(0x06); //don't move after display
     lcd_wrcmd(0x01); //Clear display
     lcdcounter=0;
}

void lcd_cls()  // clear LCD
{
     lcd_wrcmd(0x01);
     lcdcounter=0;
}

void timer0(void) interrupt 1 // T0 interrupt service routine
{
     TH0=0xd8; /*12M,10ms*/
     TL0=0xf6;
     TR0=1;
     if(sys10mscounter !=0)sys10mscounter--;  // 10ms timer
     if(syslimitcounter!=0)syslimitcounter--; // 10ms timer
}

main()
{unsigned char j;

     IE=0;P0=0xff;P1=0xff;P2=0xff;P3=0xff; // Initialize
     lcd_init(); soft_20ms();
     TMOD=0x51;
     TH0=0xd8; /*12M,10ms*/
     TL0=0xf6;
     TR0=1;ET0=1;EA=1;
     while(1)
     {
     // Display :
     // All black; horizontal 1; horizontal 2; vertical 1; vertical 2
     // UUUUUU...., QQQQQQQ.... ABCD...
     lcd_init(); // all black
     for(j=0;j<80;j++){lcd_wrdata(0xff);}
     hard_10ms(50);

     lcd_init(); // Horizontal 1 -> check font definition
     lcd_wrcmd(0x40);
     for(j=0;j<8;j++)lcd_wrdata(path1[j]);
     for(j=0;j<100;j++)lcd_wrdata(0);
     hard_10ms(50);

     lcd_init(); // Horizontal 2
     lcd_wrcmd(0x40);
     for(j=0;j<8;j++)lcd_wrdata(path2[j]);
     for(j=0;j<100;j++)lcd_wrdata(0);
     hard_10ms(50);

     lcd_init(); // Vertical 1
     lcd_wrcmd(0x40);
     for(j=0;j<8;j++)lcd_wrdata(pats1[j]);
     for(j=0;j<100;j++)lcd_wrdata(0);
     hard_10ms(50);

     lcd_init(); // Vertical 2
     lcd_wrcmd(0x40);
     for(j=0;j<8;j++)lcd_wrdata(pats2[j]);
     for(j=0;j<100;j++)lcd_wrdata(0);
     hard_10ms(50);

     lcd_init();
     lcd_string("UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU");
     hard_10ms(50);

     lcd_init();
     lcd_string("QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ");
     hard_10ms(50);

     lcd_init();
     lcd_string("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz0123456789+-!#$%&?");
     hard_10ms(50);
     }
}