flashwrite.c

自己编写的flash烧写程序工程

#include "..\inc\44b.h"
#include "..\inc\44blib.h"
#include "..\inc\def.h"
#include "..\inc\flash.h"

void  waitfor_endprog(void)//等待系统工作结束
{  volatile U16 flashstatus,old;
   old=*((volatile U16 *)0x0);//用察看bit5的方法来检查
   while(1)
    {
       flashstatus=*((volatile U16 *)0x0);
       if((old&0x40)==(flashstatus&0x40))
           break;
       else
           old=flashstatus;
    }
  
}

U32  secaddr(U16 sec_index)//返回相应段的首地址
{
  switch(sec_index)
   {
    case 0:return 0;
    case 1:return 0x2000;
    case 2:return 0x3000;
    case 3:return 0x4000;
    default:return(sec_index-3)<<15;
   }
}

void flash_sectorerase(U16 sector_index)//进行相应段的删除
{
  U32 address;
  address=secaddr(sector_index);
  writeflash(0x555,0xAA);
  writeflash(0x2AA,0x55);
  writeflash(0x555,0x80);
  writeflash(0x555,0xAA);
  writeflash(0x2AA,0x55);
  Uart_Printf("Erasing sector %d.\n",sector_index);
  writeflash(address,0x30);
  waitfor_endprog();  
}

void flash_erase(U32 start,U32 end)//进行从首地址到末地址的段擦除
{
  U16 start_i,end_i,i;
  for(start_i=0;secaddr(start_i)<=start;start_i++);
  for(end_i=start_i;secaddr(end_i)<end-1;end_i++);
  Uart_Printf("erase range:sector %d to sector %d\n",start_i-1,end_i-1);
  for(i=start_i-1;i<end_i;i++)
    { flash_sectorerase(i);}
}

void chip_erase(void)//整片擦除
{
  writeflash(0x555,0xAA);
  writeflash(0x2AA,0x55);
  writeflash(0x555,0x80);
  writeflash(0x555,0xAA);
  writeflash(0x2AA,0x55);
  writeflash(0x555,0x10);
  waitfor_endprog();
}

void flash_wordprog(U32 addr,U16 dat)
{
  writeflash(0x555,0xAA);
  writeflash(0x2AA,0x55);
  writeflash(0x555,0xA0);
  writeflash(addr,dat);
  waitfor_endprog();
}