v1.c

#include<LPC17xx.h>
#include<stdio.h>

unsigned int flag1 = 0;
unsigned int flag2 = 0;
#define RS_CTRL 0x08000000
#define EN_CTRL 0x10000000
#define DT_CTRL 0x07800000


unsigned long int temp1=0,temp2=0,i,j;
unsigned char flag1L=0,flag2L=0;
unsigned char msg[]={"No of People:"};

void lcd_write();
void port_write();
void delay_lcd(unsigned int);
unsigned long int init_command[]={0x30,0x30,0x30,0x20,0x28,0x0c,0x06,0x01,0x80};
unsigned int count = 0;




int main()
{
SystemInit();
SystemCoreClockUpdate();

    
LPC_GPIO0->FIODIR = 0x00000FF0;
LPC_GPIO0->FIODIR |= DT_CTRL | RS_CTRL | EN_CTRL;
flag1L=0;
for (i=0;i<9;i++){
    temp1=init_command[i];
    lcd_write();
}

while(1)
{


    if((LPC_GPIO2->FIOPIN & (1<<12)) && flag1 == 0)
    {
        flag1 = 1;
    }

    if((LPC_GPIO2->FIOPIN & (1<<13)) && flag1 == 1)
    {
        count = count + 1;
        flag2 = 1;
    }

    if((LPC_GPIO2->FIOPIN & (1<<13)) && flag2 == 0)
    {
        flag2 = 1;
    }

    if((LPC_GPIO2->FIOPIN & (1<<12)) && flag2 == 1)
    {
        count = count -1;
        flag1 = 1;
    }

    if(flag1 == 1 && flag2 == 1)
    {
        flag1 = 0;
        flag2 = 0;
    }

    if(count > 0)
    {
        LPC_GPIO2->FIOPIN = 0x00000FF0;
    }
    else
    {
        LPC_GPIO2->FIOCLR = 0x00000FF0;
    }

   flag1L=0;
   temp1=0X80;
   lcd_write();
   flag1L=1;
   sprintf(msg,"%d",count);
   i=0;
   while(msg[i]!='\0')
   {
    temp1=msg[i++];
    lcd_write();
   }

}

}

void lcd_write(void){
    flag2=(flag1==1)?0:((temp1==0x30)||(temp1==0x20)) ? 1:0;
    temp2=temp1&0xf0;
    temp2=temp2<<19;
    port_write();
    if(!flag2){
        temp2=temp1&0x0f;
        temp2=temp2<<23;
        port_write();
    }
}

void port_write(void){
    LPC_GPIO0->FIOPIN=temp2;
    if(flag1L==0){
        LPC_GPIO0->FIOCLR=RS_CTRL;
    }
    else{
        LPC_GPIO0->FIOSET=RS_CTRL;
    }
    LPC_GPIO0->FIOSET=EN_CTRL;
    delay_lcd(25);
    LPC_GPIO0->FIOCLR=EN_CTRL;
    delay_lcd(5000);
}

void delay_lcd(unsigned int r1){
    unsigned int r;
    for(r=0;r<r1;r++);
    return;
}