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标题: STM32 对内部FLASH读写接口函数（4） [打印本页]

作者: yuyang911220 时间: 2014-9-25 23:22 标题: STM32 对内部FLASH读写接口函数（4）

/*******************起始指针在Flash页的开始端****************************
else
{ printf("startptr in Page head \r\n");
  if((NumByteToWrite % PAGE_SIZE)!= 0)
  {
//读取1 PAGE数据到内存，修改，然后写进去
I2C_EE_BufferRead(0,0,(u16)(tempaddress+NumByteToWrite-(NumByteToWrite% PAGE_SIZE)),PAGE_SIZE,buf1);
printf("alreadycopy to bug1 \r\n");
memcpy(buf1,pRomData+NumByteToWrite-(NumByteToWrite% PAGE_SIZE),(NumByteToWrite % PAGE_SIZE));//end of debug
  }
  //擦除Flash
  if((NumByteToWrite%PAGE_SIZE) == 0 )
  {
   pagenumber = NumByteToWrite/PAGE_SIZE;
  }
  else
  {
   pagenumber = NumByteToWrite/PAGE_SIZE + 1;
  }
for(EraseCounter = 0; (EraseCounter < pagenumber)&& (FLASHStatus == FLASH_COMPLETE);EraseCounter++)
  {
   FLASHStatus = FLASH_ErasePage(startaddress +(PAGE_SIZE * EraseCounter));
  }

  //写Flash
  if(pagenumber == 1) /*只有一页
  {

i=PAGE_SIZE/4;
datasource =(uint32_t)buf1;
FlashAddress= startaddress;
while(i-->0)
{
   FLASH_ProgramWord(FlashAddress,*(uint32_t *)datasource);
   if (*(uint32_t *)FlashAddress != *(uint32_t *)datasource)
   {
         printf("I2C_EE_BufferWrite error!\r\n");
         return ;
   }
   datasource +=4;
   FlashAddress +=4;
}
  }
  else /*很多页时，先写前面页，最后写buf1
  {
while(pagenumber-- > 1 )
{
datasource= (u32)pRomData;
FlashAddress= startaddress;
i=PAGE_SIZE/4;
while(i-- >0)
{
         FLASH_ProgramWord( FlashAddress, *(uint32_t *)datasource );
         if (*(uint32_t *)FlashAddress != *(uint32_t *)datasource)
         {
               printf("I2C_EE_BufferWrite error!\r\n");
               return ;
         }
         datasource += 4;
         FlashAddress += 4;
}
}
//写后面的页
datasource= (uint32_t)buf1;
FlashAddress= startaddress+(pagenumber-1)*PAGE_SIZE;
i=PAGE_SIZE/4;
while(i -->0)
{
   FLASH_ProgramWord( FlashAddress, *(uint32_t*)datasource );
   if (*(uint32_t *)FlashAddress != *(uint32_t *)datasource)
   {
         printf("I2C_EE_BufferWrite error!\r\n");
         return;
   }
   datasource += 4;
   FlashAddress += 4;
}
  }
}
}

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