I2C EEPROM for LPC2148

I2C and EEPROM

I2C with  segment display

#include <LPC214x.h>
#include <stdio.h>

#define MAX  6
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<   Declarations  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
void I2C_ISR(void)__irq;
void Wait (unsigned int);
void I2C_Init (void);
int I2C_Start (unsigned int Slave_Addr);
int I2C_Write (unsigned char *Buff, unsigned int Count);


unsigned char Buff[]	=	{0x00,0x27,0x3F,0x3F,0x3F,0x3F};
unsigned char Segment[]	=	{0x3F/*0*/,0x06/*1*/,0x5B/*2*/,0x4F/*3*/,0x66/*4*/,
							 0x6D/*5*/,0x7D/*6*/,0x07/*7*/,0x7F/*8*/,0x6F/*9*/};

unsigned char index		=	0;
unsigned int flag=0;

unsigned char	all_chars[] = "0123456789-.ACEFGHIJLPUYbcdfhinortu°";

char digit[] =	{
					0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,
					0x77,0x7C,0x58,0x39,0x5E,0x79,0x71,0x3D,0x76,0x0E,
					0x38,0x54,0x5C,0x73,0x50,0x78,0x3E,0x1C,0x6E
				};

#define	AA		2
#define	SI		3
#define	STO		4
#define	STA		5
#define	I2EN	6


void Delay(void)
{
	unsigned int i,j;
	
	for(i=0;i<150;i++)
		for(j=0;j<900;j++);
}

void Wait (unsigned int Delay)
{
	while(Delay--);
}

void I2C_Init (void)
{
	I2C0SCLH	=	150;		//50%duty cycle .....   I2C Frequency ->100 KHz for PCLK = 30MHz 
	I2C0SCLL	=	150;
	I2C0CONSET	=	1 << I2EN;	//Enable I2C 0 

}

int I2C_Start (unsigned int Slave_Addr)
{
	I2C0CONCLR	=	1 << STO;
	I2C0CONCLR	=	1 << AA;

	I2C0CONSET	=	1 << STA;

	return 0;
}

int I2C_Write (unsigned char *Buff, unsigned int Count)
{
	while(Count--)
	{
		I2C0DAT		=	*Buff++;
	}
	return 0;
}
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<   Main Function  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


int main()
{
	unsigned int i,j,k,l;			   // initialize the variables

	VPBDIV	=	0x02;
	PINSEL0		=	0x00000055;			// P0.3 - SDA0 and P0.2	- SCL0 
   	
	U0LCR	=	0x83;
	U0DLL	=	97; 
	U0DLM	=	0x00;
	U0LCR	=	0x03;

	VICIntSelect	= 0<<9;
	VICVectCntl0 	= 0x020 | 9 ;
	VICVectAddr0 	= (unsigned long)I2C_ISR;
	VICIntEnable 	= 1<<9;

	I2C_Init();						// Initialize I2C in Interrupt mode

	I2C_Start (0x70);				
	
	for (i=0;i<30;i++)	Wait(10000);
	
	I2C0CONCLR	=	1 << SI;
	i=0;
	j=0;
	k=0;
	l=0;	

	while(1)
	{								 // display the 4 digits on 4 7-segment display in upcounter manner
		Delay();
		Delay();
		flag++;
		if (flag > 10)
		{
			flag = 0;
			i++;
			if (i>9)
			{
				i=0;
				j++;
				if (j>9)
				{
					j=0;
					k++;
					if (k>9)
					{
						k=0;
						l++;
						if (l>9)
							i=j=k=l=0;
					}
				}
			}	
		}
		Buff [4] = Segment[i];
		Buff [5] = Segment[j];
		Buff [3] = Segment[k];
		Buff [2] = Segment[l];	
	}

}

void I2C_ISR(void) __irq
{
	if (I2C0CONSET & 0x08)
	{
		

		switch (I2C0STAT)
		{
			case (0x08)	:	I2C0CONCLR	=	1 << STA;
							I2C0DAT		=	0x70;		//Slave Addr + W
							U0THR	=	I2C0STAT;
							//I2C0CONCLR	=	0x08;		//Clear SI
							break;
	
			case (0x10)	:	I2C0CONCLR	=	1 << STA;		//Clear START Bit
							I2C0DAT		=	0x70;		//This Status is recieved if "Repeated START" is txd
							U0THR	=	'C';
							break;
	
			case (0x18)	:	I2C0CONCLR	=	0x20;		//Clear START Bit
							I2C0DAT		=	Buff[index];
							U0THR	=	'D';
							index++;						
							break;
	
			case (0x20)	:	I2C0CONCLR	=	0x20;		//Clear START Bit
							I2C0DAT		=	Buff[index];
							U0THR	=	'E';
							index++;						
							break;
	
			case (0x28)	:	I2C0CONCLR	=	0x20;		//Clear START Bit
							if (index < MAX)
							{
								I2C0DAT		=	Buff[index];
								U0THR	=	'F';
								index++;
							}
							else
							{
								index = 0;
								I2C0CONSET	=	0x10;		//Send STOP Bit
								U0THR	=	'G';
								I2C_Start(0x70);
								I2C0CONCLR	=	1 << SI;
							}
							break;
	
			case (0x30)	:	I2C0CONCLR	=	0x20;		//Clear START Bit
							if (index < MAX)
							{
								I2C0DAT		=	Buff[index];
								U0THR	=	'H';
								index++;
							}
							else
							{
								index = 0;
								I2C0CONSET	=	0x10;		//Send STOP Bit
								U0THR	=	'I';
								I2C_Start(0x70);
							}
							break;
	
			case (0x38)	:	I2C0CONSET	=	0x20;
							break;
		}
	}
	I2C0CONCLR	=	1 << SI;
	VICVectAddr	=	0x00;
}