c51写的X25045的读写程序
/***************************************************************
     *   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
＃i nclude "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[2];
   byte b[4];
}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 int   t;

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[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);
}
//----------------------------------------------------------------
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[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;
}

}
//----------------------------------------------------------------
*/
  

• 评论内容...
• 匿名发表
• [添加到收藏夹]
• 发表评论：(匿名发表无需登录，已登录用户可直接发表。) 登录状态：未登录