/*  Name     : main.c
 *  Purpose  : Source code for ADC 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
 
void delay_fv(unsigned int x,int y);
 
void lcd_display(unsigned int x);
void cmd(unsigned char m);
void lcd_ini();
void lcd_pos(int line, int pos);
void lcd_str(unsigned char *x);
 
void adc_ini();
unsigned long int adc_data();
 
int main()
  {
		unsigned long temp;
		unsigned char first,second,third,fourth;
		PINSEL0=0X00000000;                                                 // select PORT0 as GPIO mode  
		IO0DIR=0XFFFFFFFF;                                                  // make PORT0 pin as Output mode 
		adc_ini();
		lcd_ini();
		lcd_str("TEMP VALUE IS");
		lcd_pos(2,6);
		lcd_display('C');
		while(1)                                                            // Repeat(loop) forever
	    {
					temp=adc_data();
					temp=temp*3300;
					temp=temp/1023;
					first=temp%10+'0';
					temp=temp/10;
					second=temp%10+'0';
					temp=temp/10;
					third=temp%10+'0';
					temp=temp/10;
					fourth=temp%10+'0';
					temp=temp/10;
					lcd_pos(2,0);
					lcd_display(fourth);
					lcd_display(third);
					lcd_display(second);
					lcd_display('.');
					lcd_display(first);
		
	    }
  }
 
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_pos(int line, int pos)                                                     // Function to select the position in LCD
  {                        
	    if(line==1)
		     cmd(0x80+pos);
	    else if(line==2)
		     cmd(0xc0+pos);
  }
	
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);
   }