========================================================*/

#include "reg51.h"

#include "intrins.h"

sbit X25_cs=P1^1;//片选接口

sbit X25_sk=P1^0;//时钟接口

sbit X25_si=P1^2;//数据输入接口

sbit X25_so=P1^3;//数据输出接口

void Write_Byte(unsigned char IData)

{

unsigned char i;

for(i=0;i<8;i++)

{

X25_cs=0;

NOP();

X25_sk=0;

IData<<=1;

NOP();

X25_si=CY;

NOP();

X25_sk=1;

NOP();

}

}

unsigned char Read_Byte(unsigned char Adress)

{

unsigned char count,i;

Write_Byte(0x03);

Write_Byte(Adress);

for(i=0;i<8;i++)

{

X25_sk=1;

count<<=1;

X25_sk=0;

if(X25_so) count++;

}

X25_cs=1;

return(count);

}

void WREN()

{

Write_Byte(0x06);

NOP();

X25_cs=1;

}

unsigned char WriteInData(unsigned char Address,unsigned char DataByte)

{ unsigned char mark ;

WREN();

Write_Byte(0x02);

Write_Byte(Address);

Write_Byte(DataByte);

//NOP();

X25_cs=1;

lag(3000);

mark=Read_Byte(Address);

if(DataByte==mark) SystemError=0;

if(mark!=DataByte) SystemError=1;

// return(SystemError);

}

//虽然是一读一写，但是其中暗藏杀机，让人很难调通。一定注意接口的位置！呵呵！不信你就按普通的SPI程序方法写写试试！