c51写的X25045的读写程序
//整理：聂小猛。该资料来自“51单片机世界”http://go.163.com/~dz2000,欢迎访问。/***************************************************************
*X25043/45 application ; Procedures
*absolute one address access
***************************************************************
WARNING: The function with '_' ahead ,user may not use it.as it
used internal
*/
//使用函数：write_status(status) 写状态，一般写0
//clr_wchdog(void) 清看门狗
//unsigned char read_byte(address) //读一个字节
//void write_byte(address,Data) //写一个字节
#define ALONE_COMPILE
#ifdef ALONE_COMPILE
#include "INTRINS.H"
#endif
#ifndef nop2()
#define nop2()_nop_();_nop_();_nop_()
#endif
#define WREN 0x06
#define WRDI 0x04
#define RDSR 0x05
#define WRSR 0x01
#define READ 0x03
#define WRITE 0x02
//#define PORT P1
sfr PORT=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 _SI 0x80//si接在p1.3，0x80=00001000b
#define _SCK 0x40//sck接在p1.2，0x80=00000100b
#define _SO 0x20//so接在p1.1
#define _CS 0x10//cs接在p1.0
//----------------------------------------------------------------
#ifndef dword
#define dword unsigned long
#define word unsigned int
#define byte unsigned char
typedef union{
word w;
byte bh;
byte bl;
}WordType;
typedef union{
dword dw;
word w;
byte b;
}DwordType;
#endif
//----------------------------------------------------------------
void _w_byte(Data)
char Data;
{
char i;
PORT &= (_SCK^0xff);
for(i=0;i<8;i++)
{
nop2();nop2();/////////////
if(Data & 0x80)PORT |= _SI;
else PORT &= (_SI^0xff);
nop2();nop2();/////////////
PORT |=_SCK;
nop2();nop2();/////////////
Data=Data<<1;
nop2();nop2();/////////////
PORT &= (_SCK^0xff);
nop2();nop2();/////////////
}
}
//----------------------------------------------------------------
char _r_byte(void)
{
char i;
char result;
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);
}
//----------------------------------------------------------------
void write_status(status)
char status;
{
PORT &=(_CS^0xff);
nop2();nop2();/////////////
_w_byte(status);
PORT |=_CS;
nop2();nop2();/////////////
return;
}
//----------------------------------------------------------------
void clr_wchdog(void)
{
PORT &= (_CS^0xff);
PORT |=_CS;
}
//----------------------------------------------------------------
void wait_free(void)
{
unsigned intt;
t=3000;
while(--t);
}
//----------------------------------------------------------------
void write_reg(_code)
char _code;
{
write_status(WREN);
PORT &= (_CS^0xff);
nop2();nop2();/////////////
_w_byte(WRSR);
_w_byte(_code);
nop2();nop2();/////////////
PORT |=_CS;
wait_free();
}
//----------------------------------------------------------------
unsigned char read_byte(address)
unsigned int address;
{
char result;
PORT &=(_CS^0xff); // Chip select
nop2();nop2();/////////////
_w_byte((char)(address>255 ? (0x08|READ): READ));
_w_byte((char)(address & 0x00ff));
result=_r_byte();
nop2();nop2();/////////////
PORT |=_CS;
// Chip unselect
return(result);
}
//----------------------------------------------------------------
void write_byte(address,Data)
unsigned int address;
char Data;
{
write_status(WREN);
nop2();nop2();/////////////
PORT &= (_CS^0xff);
nop2();nop2();/////////////
_w_byte((unsigned char)(address>255 ? (0x08|WRITE): WRITE));
_w_byte((unsigned char)(address & 0x00ff));
_w_byte(Data);
nop2();nop2();/////////////
PORT |=_CS;
wait_free();
return;
}
/*
//----------------------------------------------------------------
unsigned long read_data(format,address)
unsigned char format;
unsigned int address;
{
DwordType result;
switch(format&0xdf)
{
case 'L':
result.b=read_byte(address);
result.b=read_byte(address+1);
result.b=read_byte(address+2);
result.b=read_byte(address+3);
break;
case 'D':
result.b=read_byte(address);
result.b=read_byte(address+1);
break;
case 'C':
result.b=read_byte(address);
break;
}
return(result.dw);
}
//----------------------------------------------------------------
void write_data(format,address,Data)
unsigned char format;
unsigned int address;
DwordType data* Data;
{
switch(format&0xdf)
{
case 'L':
write_byte(address, Data->b);
write_byte(address+1, Data->b);
write_byte(address+2, Data->b);
write_byte(address+3, Data->b);
break;
case 'D':
write_byte(address, Data->b);
write_byte(address+1, Data->b);
break;
case 'C':
write_byte(address, Data->b);
break;
}
}
//----------------------------------------------------------------
*/
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