x25045r&w_c51.txt

开发平台为Keil Cx51

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
 #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[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;
 }

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