w29c040读写程序.txt

W29C040(512K FLASH)读写程序2007-09-10 11:16很是激动

W29C040(512K FLASH)读写程序2007-09-10 11:16很是激动，去年用AT89S52捣弄了半年也没搞定，这次换成C8051f040，也不知道是天见我可怜还是狗运，终于把数据写进去了。想当时到处找的程序都没用，郁闷非常，这次走运成功，拿出来晒晒太阳（虽然也是该的别人的程序，但是好歹能用）。

/*W29C040(512K FLASH)读写程序*/
#include    <c8051f040.h>
#include <INTRINS.h>
#include <absacc.h>
sbit    E=P1^0;
sbit    RW=P1^1;
sbit    RS=P1^2;
sbit A16=P4^0;//高地址16读写，推拉式
sbit A17=P4^1;//高地址17读写，推拉式
sbit A18=P4^2;//高地址18读写，推拉式
sbit CS=P4^4;//片选，低电平有效，推拉式
//C8051F040有两套外部存储器接口，为了方便，这里用第二套，且不用分时复用
sbit WR=P4^7
sbit RD=P4^6;
sbit Button=P3^7;
//P7    数据写推拉式，数据读漏极开路
//P6 低地址读写，推拉式 
//P5 高地址读写，推拉式
//256B数组
unsigned int xdata Data[256]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255};

void Delay(unsigned int l_time); 
void protect(); 
void erase();
void read();
void select_segment(unsigned char seg); 
/***********************************************************************************/
void Reset_Sources_Init()//禁止看门狗
{
     WDTCN       = 0xDE;
     WDTCN       = 0xAD;
}
void EMI_Init()//设置EMI，WR=P4^7，RD=P4^6;P7    数据读写，P6 低地址读写，P5 高地址读写
{
     SFRPAGE     = EMI0_PAGE;
     EMI0CF      = 0x37;
}
void Port_IO_Init()//端口状态设置，推拉——漏极
{
     SFRPAGE     = CONFIG_PAGE;
     P4MDOUT     = 0xD0;
     P5MDOUT     = 0xFF;
     P6MDOUT     = 0xFF;
     P7MDOUT     = 0xFF;
     XBR2        = 0x40;    
}
void Init_Device(void)//初始化
{
     Reset_Sources_Init();
     EMI_Init();
     Port_IO_Init();
}
/***********************************************************************************/
void SendCommandByte(unsigned char ch)//液晶1602写控制命令
{
     RS=0;  
     RW=0;
     P2=ch;
     E=1;
     Delay(10);
     E=0;
     Delay(100);  
}
void SendDataByte(unsigned char ch)//液晶1602写数据
{    RS=1;
     RW=0;
     P2=ch;
     E=1;
     Delay(10);
     E=0;
     Delay(100);  
}
void InitLcd()//液晶1602初始化
{
     SendCommandByte(0x30);
     SendCommandByte(0x30);
     SendCommandByte(0x30);
     SendCommandByte(0x38); //设置工作方式
     SendCommandByte(0x0c); //显示状态设置
     SendCommandByte(0x01); //清屏
     SendCommandByte(0x06); //输入方式设置
}
void DisplayMsg1(unsigned char *p)//显示第一行
{ 
     unsigned char count;
     SendCommandByte(0x80);    //设置DDRAM地址 
     Delay(2000);//根据单片机频率设置延时，以免液晶未准备好导致字符显示不完全
     for(count=0;count<16;count++)
      {
        SendDataByte(*p++);
      }
} 

void DisplayMsg2(unsigned char *p)//显示第二行
{ 
     unsigned char count;
     SendCommandByte(0xc0);    //设置DDRAM地址 
     Delay(2000);
     for(count=0;count<16;count++)
      {
SendDataByte(*p++);
      }
}

/***********************************************************************************/
void write_data(unsigned int m_addr,unsigned int s_sector,unsigned int acount) //写数据
{ 
     unsigned int data addraa; /* addraa 为内存地址，addrbb 为29C040地址 */ 
     unsigned int data i,j;  
     bit flag;
     addraa=m_addr;   
     for(j=acount;j>0;j--) 
     { 
protect(); //接触保护 ？
CS=0;
     select_segment(s_sector/256); /*s_sector 是256的整数倍*/ 
     for(i=0;i<256;i++,addraa++) 
     {     
       XBYTE[addraa]=Data[i];    //高位   
    }
/*翻转位判断写入完成  
           --addraa;
     ACC=Data[addraa];
     flag=ACC^7;  
      while(1)
      {
       ACC=XBYTE[addraa];
       if(ACC^7==flag) break;
       flag=ACC^7; 
       }  
*/  
//延时等待写入完成
for(i=0;i<2;i++)
     { 
      Delay(65535);
     } 
     CS=1;
     s_sector++; 
     }      
} 
/* 选择 29C040 段地址(高位地址),seg 为段地址*/ 
void select_segment(unsigned char seg) 
{ 

     P4&=0xf8;
     switch(seg) 
     { 
        case 0: P4|=0x00; break; // 29c040 a18a17a16= 000 00000-0ffff 
        case 1: P4|=0x01; break; // 29c040 a18a17a16= 001 10000-1ffff 
        case 2: P4|=0x02; break; // 29c040 a18a17a16= 010 20000-2ffff 
        case 3: P4|=0x03; break; // 29c040 a18a17a16= 011 30000-3ffff 
        case 4: P4|=0x04; break; // 29c040 a18a17a16= 100 40000-4ffff 
        case 5: P4|=0x05; break; // 29c040 a18a17a16= 101 50000-5ffff 
        case 6: P4|=0x06; break; // 29c040 a18a17a16= 110 60000-6ffff 
        case 7: P4|=0x07; break; // 29c040 a18a17a16= 111 70000-7ffff 
     } 
}  
void protect() //解除保护？
{ 
     select_segment(0);/*必须写到第0段*/  
     XBYTE[0x5555]=0xaa; 
     XBYTE[0x2aaa]=0x55; 
     XBYTE[0x5555]=0xa0;  
} 
void erase()//整片擦除
{
     unsigned char i;
     select_segment(0);/*必须写到第0段*/ 
     CS=0;
     XBYTE[0x5555]=0xaa; 
     XBYTE[0x2aaa]=0x55; 
     XBYTE[0x5555]=0x80; 
     XBYTE[0x5555]=0xAA;
     XBYTE[0x2AAA]=0x55;  
     XBYTE[0x5555]=0x10; 
     CS=1;
     for(i=0;i<6;i++)
     { 
        Delay(65535);
     }
     _nop_();
}
void Read(unsigned int r_addr)//读数据
{
     unsigned char    ch1[16]="addr 0x           ";
     unsigned char    ch2[16]="data 0x           ";
     unsigned char i;
     unsigned    int Data;

     //读数据，P7为漏极开路
     SFRPAGE     = CONFIG_PAGE;
     P4MDOUT     = 0xD0;
     P5MDOUT     = 0xFF;
     P6MDOUT     = 0xFF;
     XBR2        = 0x40;

     CS=0;
     _nop_();_nop_();_nop_();_nop_();_nop_();
     Data=XBYTE[r_addr];
     CS=1;
/***********************************************/
    //转化为可显示ASCII字符
     ch2[8]=Data%0x10+0x30;
     ch2[7]=Data/0x10%0x10+0x30;
     for(i=7;i<9;i++)
     {
       if(ch2[i]>0x39) ch2[i]+=0x7;
     }
     ch1[10]=r_addr%0x10+0x30;
     ch1[9]=r_addr/0x10%0x10+0x30;
     ch1[8]=r_addr/0x100%0x10+0x30;
     ch1[7]=r_addr/0x1000%0x10+0x30;    
     for(i=7;i<11;i++)
     {
      if(ch1[i]>0x39) ch1[i]+=0x7;
     }
/**********************************************/
     SendCommandByte(0x01); //清屏
     DisplayMsg1(ch1);
     DisplayMsg2(ch2);    
}
void Delay(unsigned int l_time)/*写完一个扇区后延时*/ 
{ 
     unsigned int data lp;
     for(lp=0;lp<l_time;lp++)      
     {;} 
}
main() 
{ 
     unsigned char xdata msg1[16]="0123456789ABCDEF";
     unsigned char xdata msg2[16]="....READY,GO!...";
     unsigned int i;
     Init_Device();
     InitLcd();
     DisplayMsg1(msg1);
     DisplayMsg2(msg2);  
     erase();
     write_data(0x2000,0,1);  
     for(i=0x2000;i<0x2100;i++)
     {
      Read(i);
      while(1)//添加一个按钮，按一下地址自加一，并显示地址和读出的数据
      {
        if(Button==0)
        {
          while(Button==0){;}     
          break;
        }
      }
     } 
while(1);