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typedef struct
{
uint8 in:1;
uint8 to:1;
uint8 AppCheck:1;
uint8 AppCheckState:1;
uint8 AppChenckResult:1;
uint8 ref1:1;
uint8 reset:2;
uint8 app2bm;
uint8 fix;
uint8 crc;
} MagicNum_st;

typedef union
{
uint8 MagicNum[4];
MagicNum_st MagicNumBit;
}MagicNum_un;

看了老半天才发现这个魔术字是个联合体，对MagicNum的操作的等同于对应位置的MagicNum_st中某个成员的操作

联合体不太常用，记录注意下

MagicNum_un* const MagicNumber = (MagicNum_un*)0xFEF00000;

&MagicNumber->MagicNum == &MagicNumber->MagicNumBit == 0xFEF00000

 

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