Main.c

#include<lpc214x.h>
#include"TIMER.H"
#include"ULTRASONIC.H"
#include"LCD.H"
#define EN (1<<16)|(1<<17)
int cent = 100;
#define delay for(i=0;i<65000;i++);
unsigned int range,i;
unsigned char* warn;
unsigned int value;
unsigned int buffer = 0;
unsigned int get_bufreg(unsigned int trange){
if(trange<=100&trange>=50){return 1;}
else if(range<50){return 0;}
else{return 2;}
}
int main()
{		VPBDIV=0x01;                 // PCLK = 60MHz
    IO0DIR |= 0x00FF3400; //10 12 13 16-23
		IO1DIR = EN;
    ultrasonic_init();
    lcd_init();
    show("Distance :");
		IOSET1 = EN;
    while(1) {
			cmd(0x8A);
        range=get_range();
				dat((range/100)%10+48);
        dat((range/10)%10+48);
        dat((range%10)+48);
        show("cm");
			//PWM_LOGIC(range);
			
if (range<50){IOCLR1 = IOCLR1|EN;
			cmd(0xC0);
			show("CRASH WARNING  ");
}
else if (range<=100&range>=50){
	if(IOSET1&&EN == EN){
				cmd(0xC0);
				show("CRASH WARNING  ");
				cent =range;
				for(i=0;i<50;i++){
					if(get_bufreg(buffer)==get_bufreg(range)){}
					else{
				while(cent!=0){
					range=get_range();
					if(range<=100&range>=50){
				IOSET1 = IOSET1|EN;
				timer1delay(cent*200);
				IOCLR1 = IOCLR1|EN;
				timer1delay((100-cent)*200);
				cent=cent-(1);
					}
				else{break;}}
				}}
				
				IOCLR1 = IOCLR1|EN;
				}
	else{IOCLR1 = IOCLR1|EN;
			cmd(0xC0);
			show("CRASH WARNING  ");}
buffer=range;
range=get_range();}
if (range>100){
		IOSET1 = IOSET1|EN;
		cmd(0xC0);
		show("You are safe :) ");
}		}
return 0;}