nor flash(SST39VF160)读写代码

在系统中由于NOR FLASH非易失性，线性，可随机存取，支持字节操作等特性，在很多项目中都会加入它。NOR FLASH的读写还是很简单的，根据DATASHEET里说明来写入命令就可以了。呵呵。里面的数据是参考DATASHEET，不明白的去看它。

 

#define write(addr,data) *((volatile unsigned short *)(addr<<1))=(unsigned short)data

#define read(addr) (*((volatile unsigned short *)(addr<<1)))
#define reset() write(0x0,0xf0f0)

unsigned int SST39VF160_CheckID(void)

{
reset();

write(0x5555,0xaa);

write(0x2aaa,0x55);
write(0x5555,0x90);

ManID=read(0x0000);
DevID=read(0x0001);

reset();

return ((ManID<<16)+DevID);
}

 

unsigned char SST39VF160_Erase(void)
{  //擦除FLASH
write(0x5555,0xaa);
write(0x2aaa,0x55);
write(0x5555,0x80);
write(0x5555,0xaa);

write(0x2aaa,0x55);
write(0x5555,0x10);
return 1;
}

unsigned char SST39VF160_WordPro(unsigned int addr,unsigned short data)
{  //写入两个字节，一个SHORT字
write(0x5555,0xaa);
write(0x2aaa,0x55);

write(0x5555,0xa0);
write(addr,data);

return wait();

}

 

unsigned char wait(void)
{

  volatile unsigned short flashstatus,old;

  old = *((volatile unsigned short *)0x0);
  while(1)
  {
    flashstatus = *((volatile unsigned short *)0x0);
    if((old&0x1000) == (flashstatus&0x1000))

      break;
    old=flashstatus;
  }

  return 1;

}

以上是一些功能函数，若你想实现FLASH的烧写，还得组合这些函数，设置一些标志，当擦除完成，烧写完成时，以便实时监控哦！

 

以下为芯片资料地址，来自老古开发网.