STM32内部flash操作函数，注意地址，写内部flash的时候，注意地址对齐，比如按word写入，Flash地址必须是4n（n>=0）起始才可以，否则写入失败。-STM32 internal flash memory manipulation functions, note address, write internal flash time, pay attention to address alignment, for example by written word, Flash address must be 4n (n>　= 0) before they can start, or write failure.