AMD flash擦除和编程源代码

说明：这是参考相关资料，xiyong8260的编写的flash擦除和编程源代码

CPU：PPC8260,

操作系统：vxworks

FLASH：AMD29LV256，使用片选2，16bit数据接口，基地址设置为0x50000000,该FLASH的块大小为0x10000，64K

该flash编程的关键点：16位数据读写地址的变换，wait函数的实现

/*****************************************************************************************************************

flash erase and prog code

Author: xiyong8260

****************************************************************************************************************/

#define ULONG unsigned long
#define UWORD unsigned short

#define FLASH2_ADDR 0x50000000   /*flash2 use CS2*/
#define FLASH3_ADDR 0x54000000   /*flash3 use CS4**/
#define ST16554_ADDR 0x60000000   /*16554，use CS5*/
#define CPLD_ADDR    0x61000000   /*16554，use CS6*/

/*初始化PPC8260的内存BANK，使得能够正常访问FLASH*/

void init_memory()
{

    *(ULONG *)(IMMR_ADDR+BR2_ADDR)= FLASH2_ADDR + 0x1001; /*16bit wide */
    *(ULONG *)(IMMR_ADDR+OR2_ADDR)= 0xfc000954;        /*32MB*/

     *(ULONG *)(IMMR_ADDR+BR4_ADDR)= FLASH3_ADDR + 0x1001; /*16bit wide*/
    *(ULONG *)(IMMR_ADDR+OR4_ADDR)= 0xfc000954;        /*32MB*/

    *(ULONG *)(IMMR_ADDR+BR5_ADDR)= ST16554_ADDR + 0x0801; /*8bit wide*/
    *(ULONG *)(IMMR_ADDR+OR5_ADDR)= 0xfff00856;        /*1M*/

    *(ULONG *)(IMMR_ADDR+BR6_ADDR)= CPLD_ADDR + 0x0801; /*8bit wide*/
    *(ULONG *)(IMMR_ADDR+OR6_ADDR)= 0xfff00856;        /*1M*/

}

/*flash test*/
ULONG FLASH_ADDR=FLASH2_ADDR;

#define _WR(addr,data) *((UWORD *)((addr<<1)+FLASH_ADDR))=(UWORD)data
#define _RD(addr) ( *((UWORD *)((addr<<1)+FLASH_ADDR)) )
#define _RESET() _WR((0x0),0xf0f0)
#define BADDR2WADDR(addr) (addr>>1)

/*WAIT函数的实现，判断FLASH是否完成操作*/

int _WAIT(void) /*Check if the bit6 toggle ends.*/
{
volatile UWORD flashStatus,old;

int i;

old=*((volatile UWORD *)(0x0+FLASH_ADDR));

while(1)
{
     flashStatus=*((volatile UWORD *)(0x0+FLASH_ADDR));
   if( (old&0x40) == (flashStatus&0x40) )break;
   if( flashStatus&0x20 )
     {
    old=*((volatile UWORD *)(0x0+FLASH_ADDR));
    flashStatus=*((volatile UWORD *)(0x0+FLASH_ADDR));
    if( (old&0x40) == (flashStatus&0x40) )
      return 0;
    else
     return 1;
     }
     old=flashStatus;
}

return 1;
}

/*擦除一块flash，输入参数为该块的起始地址*/

void EraseSector(unsigned long targetAddr)
{
     int level;

     printf("Sector Erase from %x is started!/n",targetAddr);
    level = intLock();
       _RESET();

       _WR(0x555,0xaaaa);
       _WR(0x2aa,0x5555);
       _WR(0x555,0x8080);
       _WR(0x555,0xaaaa);
       _WR(0x2aa,0x5555);
       _WR(BADDR2WADDR(targetAddr),0x3030);
       _WAIT();
       _RESET();
       intUnlock(level);
}

int BlankCheck(unsigned long targetAddr, unsigned long targetSize)
{
    unsigned long i,j;
    for(i=0;i    {
   j=*((UWORD *)(i+targetAddr+FLASH_ADDR));
   if( j!=0xffff)
   {
    printf("E:%x=%x/n",(i+targetAddr+FLASH_ADDR),j);
    return 0;
   }
    }
    return 1;
}

/*以word为单位写入flash*/

int ProgFlash(unsigned long realAddr,UWORD data)
{
volatile UWORD *tempPt; /*???为什么定义一个多余的tempPt?*/

        tempPt=(volatile UWORD *)(realAddr+FLASH_ADDR);
        _WR(0x555,0xaaaa);
        _WR(0x2aa,0x5555);
        _WR(0x555,0xa0a0);

*tempPt=data;
return _WAIT();

}

/*多数据的写入，写入前需要保证该数据区域是空的，也就是0XFF*/
int ChipProg(unsigned long romAddr,unsigned long ramAddr, unsigned long progRomSize)
{
unsigned long i,j;
int level;

level = intLock();
for(i=0;i {
for(j=0;j<50;j++); /*delay*/
ProgFlash((i + romAddr),*((UWORD *)(ramAddr + i) ) );
}
intUnlock(level);
/*taskDelay(1);*/

for(i=0;i {
  if(*( (UWORD *)( i+ romAddr+FLASH_ADDR) )!=*((UWORD *)(ramAddr + i) ) )
  {
   printf("%x=verify error/n",romAddr);
   return 0;
  }
}
return 1;
}

/*测试代码，输入参数为哪个flash*/

void flash_test(int flash)       /*flash 的测试程序*/
{

char *p;
char flash2[]="hi,this is flash2!";
char flash3[]="hi,this is flash3!";
if (flash==2)
{
  FLASH_ADDR=FLASH2_ADDR;
  p=flash2;
}
else
{
   FLASH_ADDR=FLASH3_ADDR;
   p=flash3;
}
EraseSector(0x0);
ChipProg(0x0,p,18);
}

在vxworks调试界面下，看到的测试结果为：

-> d 0x50000000

50000000: 6869 2c74 6869 7320 6973 2066 6c61 7368 *hi,this is flash*

50000010: 3221 ffff ffff ffff ffff ffff ffff ffff *2!..............*

AMD flash擦除和编程源代码

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