/*  Name     : main.c
 *  Purpose  : Source code for LDR Interfacing with ARM LPC1248.
 *  Author   : Gemicates
 *  Date     : 2018-09-02
 *  Website  : www.gemicates.org
 *  Revision : None
 */
#include<lpc214x.h>                                                // header file for LPC21XX series
 
#define LCD (0xff<<16)
#define RS (1<<13)                                                 // register select pin
#define RW (1<<14)                                                 // read write pin
#define EN (1<<15)                                                 // enable pin
#define LED (1<<31)
 
void delay_fv(unsigned int x,int y);
 
void lcd_display(unsigned int x);
void cmd(unsigned char m);
void lcd_ini();
void lcd_str(unsigned char *x);
 
void adc_ini();
unsigned long int adc_data();
 
int main()
  {
   unsigned int val;
   PINSEL0=0X00000000;                                             // select PORT0 as GPIO mode 
   IO0DIR=0XFFFFFFFF;                                              // make PORT0 pin as Output mode 
   VPBDIV=0x02;
   adc_ini();
   lcd_ini();
   while(1)                                                        // Repeat(loop) forever
   {
     cmd(0x80);                                                    // clear screen
     lcd_str("LIGHT INT: ");
     val=adc_data();
     lcd_display(val);
      if(val>800) 
        {

           lcd_str("LOW ");
           IO0SET = LED;
        }

      else 
       {
          lcd_str("HIGH");
          IO0CLR = LED;
        }
    }
}
   
void delay_fv(unsigned int x,int y)                                // Time delay function in milli seconds
  {
			 unsigned int i,j;
			 for(i=0;i<x;i++)
			 for(j=0;j<y;j++);
  }
void lcd_display(unsigned int x)                                   // Function to send data to LCD
   {
			 IO0CLR|=(RS|RW|EN|LCD);
			 IO0SET|=(x<<16);
			 IO0SET|=RS;
			 IO0CLR|=RW;
			 IO0SET|=EN;
			 delay_fv(100,200);
			 IO0CLR|=EN;
			 delay_fv(10,10);
   }
  
void cmd(unsigned char m)                                          // Function to send command to LCD
   {
			 IO0CLR|=(RS|RW|EN|LCD);
			 IO0SET|=(m<<16);
			 IO0CLR|=RS;
			 IO0CLR|=RW;
			 IO0SET|=EN;
			 delay_fv(100,10);
			 IO0CLR|=EN;
			 delay_fv(100,10);
   }
 
void lcd_ini()                                                     // Funtion to Initialize LCD
  {
			cmd(0X38);                                 // for using 8-bit 2 row mode and 5x7 Dots of LCD
			cmd(0X0C);                                 // turn display ON for cursor OFF
			cmd(0X06);                                 // display ON
			cmd(0X01);                                 // clear screen
			cmd(0X80);                                 // clear screen
  }
	
	
void lcd_str(unsigned char *x)                                     // Function to display in LCD 
  {
	    while(*x!='\0')
	      {
		        lcd_display(*x);
		        x++;
	      }
  }
	

	
void adc_ini()
  {
		AD0CR = 1<<21;	                                   // A/D is Operational
		AD0CR = 0<<21;	                                   // A/D is in Power Down Mode
		PINSEL1 = 0x01000000;                              // P0.28 is Configured as Analog to Digital Converter Pin AD0.1
		AD0CR = 0x00200802;                                // CLKDIV=4,Channel-0.1 Selected,BURST=0,EDGE=0
	
  }
	
unsigned long int adc_data()
   {
	      unsigned long rec;	
              AD0CR |= (1<<24);			                   // Start Conversion
	      while(!(AD0GDR & 0x80000000));
/*Wait untill the DONE bits Sets*/
	      rec = AD0GDR;
	      AD0CR &= ~0x01000000;	                           // Stops the A/D Conversion   				
	      rec = rec >> 6;                                      // data is present after 6 bit
	      rec = rec & 0x3FF;                                   // Clearing all other Bits
	      return (rec);
   }