//----------------------------------------------------------------------
/*EASTRISING TECHNOLOGY CO,.LTD.*/
// Module    : ERC802-1 Series
// Create    : JAVEN
// Lanuage   : C51 Code
// Date      : 2009-06-18
// Drive IC  : ST7032I
// INTERFACE : I2C
// MCU 		 : AT89C52
// VDD		 : 5.0V
//----------------------------------------------------------------------
#include <reg51.h>
#include <intrins.h>

#define Write_Address 0x7c/*slave addresses with write*/
#define Read_Address 0x7d/*slave addresses with read*/

sbit SDA=P1^7;/*I2C serial data).*/
sbit SCL=P1^6;/*I2C serial clock).*/
sbit RST=P3^5;/*reset*/



unsigned char code font[]=
{

0x29,0x31,0x32,0x33,0x34,0x35,0x36,0x37

};


/*******************************************************************************
* Function Name  : Delay
* Description    : Delay n * 2us.
* Input          : n
* Output         : None
* Return         : None
*******************************************************************************/
void Delay(unsigned int n)
{
    while(n--);
	return;
}


/*******************************************************************************
* Function Name  : Start
* Description    : I2C Start.
* Input          : n
* Output         : None
* Return         : None
*******************************************************************************/
void Start(void)/*start*/
{
    SDA=1;
    SCL=1;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    SDA=0;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    return;
}


/*******************************************************************************
* Function Name  : Stop
* Description    : I2C stop.
* Input          : n
* Output         : None
* Return         : None
*******************************************************************************/
void Stop(void)/*stop*/
{
    SDA=0;
    SCL=1;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    SDA=1;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    return;
}


/*******************************************************************************
* Function Name  : Check_Ack
* Description    : Check acknowledge.
* Input          : n
* Output         : None
* Return         : None
*******************************************************************************/
void Check_Ack(void)//Ó¦´ðλ
{
    unsigned char ack=1;
	SDA=1;
    SCL=1;
    _nop_();
    _nop_();
    _nop_();
    while(ack==1){ack=SDA;};
    _nop_();
    SCL=0;
    return;
}

/*******************************************************************************
* Function Name  : Send
* Description    : send one byte data.
* Input          : Data
* Output         : None
* Return         : None
*******************************************************************************/
void Send(unsigned char Data)/*send 8bit data*/
{
    unsigned char BitCounter=8;
    unsigned char temp;
    do
    {
        temp=Data;
        SCL=0;
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        if((temp&0x80)==0x80)
        SDA=1;
        else
        SDA=0;
        SCL=1;
        temp=Data<<1;
        Data=temp;
        BitCounter--;
    }
	while(BitCounter);
    SCL=0;
}


/*******************************************************************************
* Function Name  : Initial
* Description    : LCM initializing 
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void Initial(void)
{	
	RST=1;
	Delay(2000);
	RST=0;
	Delay(2000);
	RST=1;
	Delay(2000);

    Start();
	Send(Write_Address);  //send slave address  with write
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
	Send(0x38);   //FUNCTION SET 8 bit,N=1,5*7dot
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
   	Send(0x39);  //FUNCTION SET 8 bit,N=1,5*7dot IS=1
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
   	Send(0x1c);   //Internal OSC frequency adjustment 183HZ    bias will be 1/4 
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
	Send(0x78);    //Contrast control  low byte
    Check_Ack();

	Send(0x80);     // control byte
    Check_Ack();
	Send(0x53);    //booster circuit is turn off./ICON   /Contrast control   high byte
    Check_Ack();

	Send(0x80);    // control byte
    Check_Ack();
	Send(0x6c);  //Follower control
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
	Send(0x0c);    //DISPLAY ON
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
	Send(0x01);   //CLEAR DISPLAY
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
	Send(0x06);   //ENTRY MODE SET  CURSOR MOVES TO RIGHT
    Check_Ack();

	Send(0x80);   // control byte
    Check_Ack();
	Send(0x02);
    Check_Ack();

    Stop();	
}

/*******************************************************************************
* Function Name  : Display
* Description    : Display one character
* Input          : dat,add
* Output         : None
* Return         : None
*******************************************************************************/
void Display(unsigned char dat,unsigned char add)
{
    add=0x80+add;
    Start();
	Send(Write_Address);
    Check_Ack();
	Send(0x80);
    Check_Ack();
	Send(add);
    Check_Ack();
    Stop();	   

    Start();
	Send(Write_Address);
    Check_Ack();
	Send(0xc0);
    Check_Ack();
	Send(dat);
    Check_Ack();
    Stop();	 
 
    return;
}



/*******************************************************************************
* Function Name  : main
* Description    : main function
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/

main()
{
    unsigned char i,j=0x30;
    Initial();
    while(1)
	{
    Start();
	Send(Write_Address);
    Check_Ack();

    for(i=0;i<0x80;i++)    //Display 80 character        
	{
		Send(0xc0);
        Check_Ack();
	    Send(j);
        Check_Ack();
    }

    Stop();	
    j++;
    if(j==0xff)j=0x30;
	Delay(60000);
	Delay(60000);

	Display(0x41,0x00);


    }
}