#include <reg52.h>
#include "./delay/delay.h"
sbit SCL = P2^0;
sbit SDA = P2^1;
bit ack = 0;

unsigned char flag = 1;
#define LCDPORT P0
#define LCD_WRITE_DATA 1
#define LCD_WRITE_COM 0
sbit RS = P2^4;
sbit RW = P2^5;
sbit E = P2^6;

#define SUCC 0
#define ERR 1

void iic_start()
{
		SDA = 1;  //先操作SDA,在操作SCL
	  SCL = 1;
	  delay_us(1);
	  SDA = 0;
		delay_us(1);
	  SCL = 0;   //鉗住匯流排
}

void iic_stop()
{
		SDA = 0;
		SCL = 1;
		delay_us(1);
		SDA = 1;
		delay_us(1);
		SCL = 0;    //鉗住匯流排
}

bit iic_send_byte(unsigned char byte)     //傳送資料，先發送高位，再發送低位  只發送一個位元組
{
		unsigned char i;
		for(i = 0; i < 8; i++)
		{
				SDA = byte & 0x80;   //與上為非0時，SDA = 1; 與上為0時，SDA = 0;
				SCL = 1;
				delay_us(1);         //延時1us
			  SCL = 0;
			  byte <<= 1;
		}
		SCL = 1;
		SDA = 1;
		delay_us(2);
		if(0 == SDA)
		{
				ack = 1;
		}
		else
		{
				ack = 0;
		}
		SCL = 0;
		
		return ack;
}

unsigned char iic_rcv_byte()       //接收資料
{
		unsigned char i;
		unsigned char temp = 0;
		unsigned char a;
		SDA = 1;
		for(i = 0; i < 8; i++)
		{
				SCL = 0;
				delay_us(1);
				SCL = 1;
				if(SDA)
				{
						a = 0x01;
				}
				else
				{
						a = 0;
				}
				temp |= (a << (7 - i));
				delay_us(1);
		}
		SCL = 0;
		return temp;
}

void iic_ack()         //響應訊號
{
		SDA = 0;						//拉低資料匯流排
		SCL = 1;						//時鐘匯流排拉高
		delay_us(1);
	
		SCL = 0;           //鉗住匯流排
}

void iic_noack()      //非響應訊號
{
		SDA = 1;					//釋放資料匯流排
		SCL = 1;					//拉高時鐘匯流排
		delay_us(1);
		
		SCL = 0;         //鉗住匯流排
}

unsigned char AT24c02_send_byte(unsigned char devaddr, unsigned char romaddr, unsigned char *s, unsigned char num)     //傳送字串
{
		unsigned char i;
	
		iic_start();                       //起始訊號
		iic_send_byte(devaddr);						//寫硬體地址
		if(0 == ack)										 //等待響應
		{
				return ERR;
		}
		iic_send_byte(romaddr);         //寫實體地址
		if(0 == ack)										//等待響應
		{
				return ERR;
		}
		for(i = 0; i < num; i++)       //傳送num個字元
		{
				iic_send_byte(*s);       //逐個位元組傳送
				if(0 == ack)
				{
						return ERR;
				}
				s++;
		}
		iic_stop();
		
		return SUCC;
}

unsigned char AT24c02_rcv_byte(unsigned char devaddr, unsigned char romaddr, unsigned char *s, unsigned char num)
{
		unsigned char i;
		iic_start();
		delay_us(10);
		iic_send_byte(devaddr);             //寫硬體地址
		if(0 == ack)                        //等待響應
		{
				return ERR;
		}
		iic_send_byte(romaddr);         //寫實體地址
		if(0 == ack)										//等待響應
		{
				return ERR;
		}
		iic_start();
		iic_send_byte(devaddr + 1);
				if(0 == ack)										//等待響應
		{
				return ERR;
		}
		for(i = 0; i < num -1; i++)     //開始讀資料
		{
				*s = iic_rcv_byte();
				iic_ack();
				s++;
		}
		*s = iic_rcv_byte();
		iic_noack();
 		delay_us(10);
		iic_stop();
		return SUCC;		
}

void lcd1602_write(unsigned char byte, unsigned char flag)
{
		if(flag)
		{
				RS = 1; 
		}
		else
		{
				RS = 0;     
		}
		RW = 0;     
		E = 1;      
		LCDPORT = byte;
		delay_ms(5);
		E = 0;   
		
}

void lcd_init()
{
		delay_ms(15);
	  lcd1602_write(0x38,LCD_WRITE_COM);
	  delay_ms(5);
	  lcd1602_write(0x38,LCD_WRITE_COM);
	  delay_ms(5);
	  lcd1602_write(0x38,LCD_WRITE_COM);
	  delay_ms(5);
	  lcd1602_write(0x38,LCD_WRITE_COM);
	  delay_ms(5);
	  lcd1602_write(0x08,LCD_WRITE_COM);
	  delay_ms(5);
	  lcd1602_write(0x01,LCD_WRITE_COM);
	  delay_ms(5);
	  lcd1602_write(0x06,LCD_WRITE_COM);
	  delay_ms(5);
	  lcd1602_write(0x0c,LCD_WRITE_COM);
	  delay_ms(5);
}


void lcd_dis_char(unsigned char x, unsigned char y, unsigned char *str)
{
		if((x > 15) || (y > 1))
		{
			 return ;
			 
		}
		if(0 == y)
		{
			 lcd1602_write(0x80 + x, LCD_WRITE_COM);
		}
		else 
		{
			 lcd1602_write(x + 0xc0,LCD_WRITE_COM);
		}
	while(*str != '\0')
	{
	  
		lcd1602_write(*str , LCD_WRITE_DATA);
		str++;
	}
}


void main()
{	
		//unsigned char i;
		unsigned char test[10] = {'0','1','2','3','4','5','6','7','8','9'};
		unsigned char temp[11];
		lcd_init();
		AT24c02_send_byte(0xae,100,test,10);
		delay_s(1);
		AT24c02_rcv_byte(0xae,100,temp,10);
		temp[10] = '\0';
		lcd_dis_char(0,0,temp);
		lcd_dis_char(0,1,temp);

	while(1)
		{
				
					 		
					
		}
}

 

delay()延時函式之前的程式中有.