c51写的X25045的读写程序

/***************************************************************

*X25043/45applicationProcedures

*absoluteoneaddressaccess

***************************************************************

WARNING:Thefunctionwith'_'ahead,usermaynotuseit.asit

usedinternal

*/

//使用函数：write_status(status)写状态，一般写0

//clr_wchdog(void)清看门狗

//unsignedcharread_byte(address)//读一个字节

//voidwrite_byte(address,Data)//写一个字节

#defineALONE_COMPILE

#ifdefALONE_COMPILE

#include"INTRINS.H"

#endif

#ifndefnop2()

#definenop2()_nop_();_nop_();_nop_()

#endif

#defineWREN0x06

#defineWRDI0x04

#defineRDSR0x05

#defineWRSR0x01

#defineREAD0x03

#defineWRITE0x02

//#definePORTP1

sfrPORT=0x90;//25045的4根io脚接在同一端口，本例为p1

//请根据实际电路更改引脚定义

#define_SI0x80//si接在p1.3，0x80=00001000b

#define_SCK0x40//sck接在p1.2，0x80=00000100b

#define_SO0x20//so接在p1.1

#define_CS0x10//cs接在p1.0

//----------------------------------------------------------------

#ifndefdword

#definedwordunsignedlong

#definewordunsignedint

#definebyteunsignedchar

typedefunion{

wordw;

bytebh;

bytebl;

}WordType;

typedefunion{

dworddw;

wordw[2];

byteb[4];

}DwordType;

#endif

//----------------------------------------------------------------

void_w_byte(Data)

charData;

{

chari;

PORT&=(_SCK^0xff);

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

{

nop2();nop2();/////////////

if(Data&0x80)PORT|=_SI;

elsePORT&=(_SI^0xff);

nop2();nop2();/////////////

PORT|=_SCK;

nop2();nop2();/////////////

Data=Data<<1;

nop2();nop2();/////////////

PORT&=(_SCK^0xff);

nop2();nop2();/////////////

}

}

//----------------------------------------------------------------

char_r_byte(void)

{

chari;

charresult;

result=0;

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

{

nop2();nop2();/////////////

PORT|=_SCK;

result=result<<1;

nop2();nop2();/////////////

if((PORT&_SO)!=0)

result|=0x01;

nop2();nop2();/////////////

PORT&=(_SCK^0xff);

nop2();nop2();/////////////

}

return(result);

}

//----------------------------------------------------------------

voidwrite_status(status)

charstatus;

{

PORT&=(_CS^0xff);

nop2();nop2();/////////////

_w_byte(status);

PORT|=_CS;

nop2();nop2();/////////////

return;

}

//----------------------------------------------------------------

voidclr_wchdog(void)

{

PORT&=(_CS^0xff);

PORT|=_CS;

}

//----------------------------------------------------------------

voidwait_free(void)

{

unsignedintt;

t=3000;

while(--t);

}

//----------------------------------------------------------------

voidwrite_reg(_code)

char_code;

{

write_status(WREN);

PORT&=(_CS^0xff);

nop2();nop2();/////////////

_w_byte(WRSR);

_w_byte(_code);

nop2();nop2();/////////////

PORT|=_CS;

wait_free();

}

//----------------------------------------------------------------

unsignedcharread_byte(address)

unsignedintaddress;

{

charresult;

PORT&=(_CS^0xff);//Chipselect

nop2();nop2();/////////////

_w_byte((char)(address>255?(0x08|READ):READ));

_w_byte((char)(address&0x00ff));

result=_r_byte();

nop2();nop2();/////////////

PORT|=_CS;

//Chipunselect

return(result);

}

//----------------------------------------------------------------

voidwrite_byte(address,Data)

unsignedintaddress;

charData;

{

write_status(WREN);

nop2();nop2();/////////////

PORT&=(_CS^0xff);

nop2();nop2();/////////////

_w_byte((unsignedchar)(address>255?(0x08|WRITE):WRITE));

_w_byte((unsignedchar)(address&0x00ff));

_w_byte(Data);

nop2();nop2();/////////////

PORT|=_CS;

wait_free();

return;

}

/*

//----------------------------------------------------------------

unsignedlongread_data(format,address)

unsignedcharformat;

unsignedintaddress;

{

DwordTyperesult;

switch(format&0xdf)

{

case'L':

result.b[0]=read_byte(address);

result.b[1]=read_byte(address+1);

result.b[2]=read_byte(address+2);

result.b[3]=read_byte(address+3);

break;

case'D':

result.b[2]=read_byte(address);

result.b[3]=read_byte(address+1);

break;

case'C':

result.b[3]=read_byte(address);

break;

}

return(result.dw);

}

//----------------------------------------------------------------

voidwrite_data(format,address,Data)

unsignedcharformat;

unsignedintaddress;

DwordTypedata*Data;

{

switch(format&0xdf)

{

case'L':

write_byte(address,Data->b[0]);

write_byte(address+1,Data->b[1]);

write_byte(address+2,Data->b[2]);

write_byte(address+3,Data->b[3]);

break;

case'D':

write_byte(address,Data->b[2]);

write_byte(address+1,Data->b[3]);

break;

case'C':

write_byte(address,Data->b[3]);

break;

}

}

//----------------------------------------------------------------

*/