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| #include <reg52.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[] =
{
0,226,229,232,233,236,238,240,241,242,245,246,247,248
};
uchar code LO_LIST[] =
{
0,4,13,10,20,3,8,6,2,23,5,26,1,4,3
};
uchar code Song_24C04[] =
{
1,2,3,1,1,2,3,1,3,4,5,3,4,5
};
uchar sidx;
void DelayMS(uint x)
{
uchar t;
while(x--)
{
for(t=120;t>0;t--);
}
}
void Start()
{
SDA=1;SCL=1;NOP4();SDA=0;NOP4();SCL=0;
}
void Stop()
{
SDA=0;SCL=0;NOP4();SCL=1;NOP4();SDA=1;
}
void RACK()
{
SDA=1;NOP4();SCL=1;NOP4();SCL=0;
}
void NO\_ACK()
{
SDA=1;SCL=1;NOP4();SCL=0;SDA=0;
}
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();
}
void Write\_IIC(uchar addr,uchar dat)
{
Start();
Write\_A\_Byte(0xa0);
Write\_A\_Byte(addr);
Write\_A\_Byte(dat);
Stop();
DelayMS(10);
}
uchar Read\_A\_Byte()
{
uchar i,b;
for(i=0;i<8;i++)
{
SCL=1;b<<=1;B|=SDA;SCL=0;
}
return b;
}
uchar Read\_Current()
{
uchar d;
Start();
Write\_A\_Byte(0xa1);
d=Read\_A\_Byte();
NO\_ACK();
Stop();
return d;
}
uchar Random\_Read(uchar addr)
{
Start();
Write\_A\_Byte(0xa0);
Write\_A\_Byte(addr);
Stop();
return Read\_Current();
}
void T0\_INT() interrupt 1
{
SPK=!SPK;
TH0=HI_LIST[sidx];
TL0=LO_LIST[sidx];
}
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);
}
}
}
|
