i2c-24c04与蜂鸣器.c

51单片机I2C总线E2ROM驱动程序

#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
#define NOP4() {_nop_();_nop_();_nop_();_nop_();}

sbit SCL=P1^0;
sbit SDA=P1^1;
sbit SPK=P3^0;

uchar code HI_LIST[]={0,226,229,232,233,236,238,240,241,242,244,245,246,247,248};
uchar code LO_LIST[]={0,4,13,10,20,3,8,6,2,23,5,26,1,4,3};
uchar code Song_24C04[]={1,1,5,3,3,1,1,2,3,4,4,3,2,5};
uchar sidx;

//------------------------------------------------------------------------------
//延时
//------------------------------------------------------------------------------
void DelayMS(uint x)
{
uchar i;
while(x--) for(i=120;i>0;i--);
}
//------------------------------------------------------------------------------
//I2C开始
//------------------------------------------------------------------------------
void start()
{
SDA=1;SCL=1;NOP4();SDA=0;NOP4();SCL=0;
}
//------------------------------------------------------------------------------
//I2C停止
//------------------------------------------------------------------------------
void stop()
{
SDA=0;SCL=0;NOP4();SCL=1;NOP4();SDA=1;
}
//-----------------------------------------------------------------------------
//读取应答
//-----------------------------------------------------------------------------
void RACK()
{
SDA=1;NOP4();SCL=1;NOP4();SCL=0;
}
//-----------------------------------------------------------------------------
//发送非应答信号
//-----------------------------------------------------------------------------
void NO_ACK()
{
SDA=1;SCL=1;NOP4();SCL=0;SDA=0;
}
//-----------------------------------------------------------------------------
//向24C04中写一字节数据
//-----------------------------------------------------------------------------
void Write_A_Byte(uchar b)
{
uchar i;
for(i=0;i<8;i++)
{
b<<=1;SDA=CY;_nop_();SCL=1;NOP4();SCL=0;
}
RACK();
}
//----------------------------------------------------------------------------
//向指定地址写数据
//----------------------------------------------------------------------------
void Write_IIC(uchar addr,uchar dat)
{
start();
Write_A_Byte(0xa0);Write_A_Byte(addr);Write_A_Byte(dat);
stop();
DelayMS(10);
}
//---------------------------------------------------------------------------
//读24C04一字节数据
//---------------------------------------------------------------------------
uchar Read_A_Byte()
{
uchar i,b;
for(i=0;i<8;i++)
{
SCL=1;b<<=1;b|=SDA;SCL=0;
}
return b;
}
//---------------------------------------------------------------------------
//从当前地址读数据
//---------------------------------------------------------------------------
uchar Read_Current() 
{
uchar d;
start();
Write_A_Byte(0xa1);d=Read_A_Byte();NO_ACK();
stop();
return d;
}
//--------------------------------------------------------------------------
//从任意地址读数据
//--------------------------------------------------------------------------
uchar Random_Read(uchar addr)
{
start();
Write_A_Byte(0xa0);Write_A_Byte(addr);
stop();
return Read_Current();
}
//-------------------------------------------------------------------------
//定时器0中断
//-------------------------------------------------------------------------
void T0_INT() interrupt 1
{
SPK=!SPK;
TH0=HI_LIST[sidx];
TL0=LO_LIST[sidx];
}
//-------------------------------------------------------------------------
//主程序
//-------------------------------------------------------------------------
void main()
{
uchar i;
IE=0x82;
TMOD=0x00;
for(i=0;i<14;i++)
{
Write_IIC(i,Song_24C04[i]);
}
while(1)
{
for(i=0;i<14;i++)
{
sidx=Random_Read(i);
TR0=1;
DelayMS(300);
}
}
}