关于STM32内部FLASH读写问题

只看该作者 · 2020-4-9 09:30

STMFLASH_Write(FLASH_SAVE_ADDR,(u16*)&TXT1,sizeof(TXT1));
STMFLASH_Read(FLASH_SAVE_ADDR,(u16*)TXT1,sizeof(TXT1));

#if STM32_FLASH_WREN //如果使能了写
//不检查的写入
//WriteAddr:起始地址
//pBuffer:数据指针
//NumToWrite:半字(16位)数
void STMFLASH_Write_NoCheck(u32 WriteAddr,u16 *pBuffer,u16 NumToWrite)
{
u16 i;
for(i=0;i<NumToWrite;i++)
{
      FLASH_ProgramHalfWord(WriteAddr,pBuffer);
      WriteAddr+=2;//地址增加2.
}
}
//从指定地址开始写入指定长度的数据
//WriteAddr:起始地址(此地址必须为2的倍数!!)
//pBuffer:数据指针
//NumToWrite:半字(16位)数(就是要写入的16位数据的个数.)
#if STM32_FLASH_SIZE<256
#define STM_SECTOR_SIZE 1024 //字节
#else
#define STM_SECTOR_SIZE 2048
#endif
u16 STMFLASH_BUF[STM_SECTOR_SIZE/2];//最多是2K字节
void STMFLASH_Write(u32 WriteAddr,u16 *pBuffer,u16 NumToWrite)
{
u32 secpos;    //扇区地址
u16 secoff;    //扇区内偏移地址(16位字计算)
u16 secremain; //扇区内剩余地址(16位字计算)
   u16 i;
u32 offaddr; //去掉0X08000000后的地址
if(WriteAddr<STM32_FLASH_BASE||(WriteAddr>=(STM32_FLASH_BASE+1024*STM32_FLASH_SIZE)))return;//非法地址
FLASH_Unlock();                      //解锁
offaddr=WriteAddr-STM32_FLASH_BASE;       //实际偏移地址.
secpos=offaddr/STM_SECTOR_SIZE;          //扇区地址  0~127 for STM32F103RBT6
secoff=(offaddr%STM_SECTOR_SIZE)/2;       //在扇区内的偏移(2个字节为基本单位.)
secremain=STM_SECTOR_SIZE/2-secoff;       //扇区剩余空间大小
if(NumToWrite<=secremain)secremain=NumToWrite;//不大于该扇区范围
while(1)
{
      STMFLASH_Read(secpos*STM_SECTOR_SIZE+STM32_FLASH_BASE,STMFLASH_BUF,STM_SECTOR_SIZE/2);//读出整个扇区的内容
      for(i=0;i<secremain;i++)//校验数据
      {
         if(STMFLASH_BUF[secoff+i]!=0XFFFF)break;//需要擦除
      }
      if(i<secremain)//需要擦除
      {
         FLASH_ErasePage(secpos*STM_SECTOR_SIZE+STM32_FLASH_BASE);//擦除这个扇区
         for(i=0;i<secremain;i++)//复制
         {
            STMFLASH_BUF[i+secoff]=pBuffer;
         }
         STMFLASH_Write_NoCheck(secpos*STM_SECTOR_SIZE+STM32_FLASH_BASE,STMFLASH_BUF,STM_SECTOR_SIZE/2);//写入整个扇区
      }else STMFLASH_Write_NoCheck(WriteAddr,pBuffer,secremain);//写已经擦除了的,直接写入扇区剩余区间.
      if(NumToWrite==secremain)break;//写入结束了
      else//写入未结束
      {
         secpos++;             //扇区地址增1
         secoff=0;             //偏移位置为0
      pBuffer+=secremain;    //指针偏移
         WriteAddr+=secremain; //写地址偏移
      NumToWrite-=secremain; //字节(16位)数递减
         if(NumToWrite>(STM_SECTOR_SIZE/2))secremain=STM_SECTOR_SIZE/2;//下一个扇区还是写不完
         else secremain=NumToWrite;//下一个扇区可以写完了
      }
};
FLASH_Lock();//上锁
}
为什么我把TXT1一个double类型数组进行强制转换就能进行浮点数的写入与读出求解