#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2))#define MEM_ADDR(addr) *((volatile unsigned long *)(addr))#define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))
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2、这句是读写内存、Flash、寄存器地址数据，三句话其实最关键的就是这句；例子：读0x1234地址数据-> a=*(volatile unsigned long *)0x1234;写0x01到0x1234地址-> *(volatile unsigned long *)0x1234 = 0x01;
3、读、写IO口。
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