#AP NEW ADC Interfacing

#include <lpc214x.h>
#include <stdio.h>

#define LCD_PORT 0x00FF0000
#define EN 1<<10 //define RS pin
#define RS 1<<11 //define EN pin
#define RW 1<<20 //define RW pin
#define LCD_SHIFT 16 //shift data by LCD_SHIFT bits

void lcd_delay(unsigned int time);
void LCD_strobe();
void LCD_data(unsigned char ch);
void LCD_cmd(unsigned char ch) ;
void LCD_init(void);
void LCD_display(int row, int pos, char *ch);
void delay(unsigned int time);
void ADCInit(void);
unsigned int ADC_Read(unsigned char channel);

int main(void)
{
unsigned int temp;
char buf[16];

LCD_init();
ADCInit();
while(1)
{
temp = ADC_Read(1); //read AN0.1
sprintf(buf,"ADC result:0x%03X",temp); //convert to string and store in a buffer
LCD_display(1,1,buf);     //display buffer
delay(20);
}
}



void lcd_delay(unsigned int time)
{
int i,j;
for(i=0;i<time;i++)
for(j=0;j<200;j++);
}

void LCD_strobe()    //Enable pulse
{
lcd_delay(100);
IOSET0 = EN;
lcd_delay(100);
IOCLR0 = EN;
lcd_delay(100);
}

void LCD_data(unsigned char ch)    //function to send data
{
IOCLR1 = LCD_PORT;    //clear LCD pins
IOSET1 = ch<<LCD_SHIFT;    //shift data and set only the data bits
IOSET0 = RS;    //RS =1
IOCLR0 = RW;    //RW = 0
LCD_strobe();    //EN pulse
}

void LCD_cmd(unsigned char ch)    //function to send command
{
IOCLR1 = LCD_PORT;
IOSET1 = ch<<LCD_SHIFT;
IOCLR0 = RS;   //RS = 0  
IOCLR0 = RW;   //RW = 0
LCD_strobe();   //EN pulse
}

void LCD_init(void)
{
PINSEL0 &= 0xFF0FFFFF;   //Pins P0.10 and P0.11 as GPIO
PINSEL1 &= 0xFFFFFCFF; //Pin P0.20 as GPIO
PINSEL2 &= 0xFFFFFFF3; //PORT1 as GPIO

IODIR0 = RS | EN | RW; //set the pins as output
IODIR1 = LCD_PORT;  

LCD_cmd(0x38); //8bit use both lines
LCD_cmd(0x06); //Entry mode
LCD_cmd(0x0C); //display ON cursor OFF
LCD_cmd(0x01); //Clear display
LCD_cmd(0x80); //cursor at 1st line 1st position
}

void LCD_display(int row, int pos, char *ch)
{
unsigned char temp;

if(row==1)
{
temp = 0x80 | (pos-1); //set cursor at 1st line pos position
}
else
{
temp = 0xC0 | (pos-1); //set cursor at 2nd line pos position
}
LCD_cmd(temp);
while(*ch) //while data is valid, display the string
LCD_data(*ch++);
}

void delay(unsigned int time)
{
unsigned int i,j;
for(i=0;i<time;i++)
for(j=0;j<5000;j++);
}


void ADCInit(void)
{
PINSEL1 &= 0xF0FFFFFF; //Configure pins P0.28 and P0.29 as ADC pins
PINSEL1 |= 0x05000000;
}

unsigned int ADC_Read(unsigned char channel)
{
static unsigned int ad1_data;

AD0CR = 0x00200300 | (1<<channel); //Set Burst mode to 0, CLK_DIV, Channels, 10bit ADC/11 cycles
AD0CR |= 1<<24;     //Start ADC

while(!(AD0GDR & 0x80000000));     //Check DONE bit
ad1_data = (AD0GDR & 0x0000FFC0)>>6; //Assign ADC result to ad1_data n display in mV

return ad1_data;
}