ARM的手册上有关于大小端的描述，如下：
The processor can access data words in memory in little-endian format or big-endian
format. It always accesses code in little-endian format.
Note：
Little-endian is the default memory format for ARM processors.
STM32是固定配置为小端的
The bytes are coded in memory in Little Endian format. The lowest numbered byte in a word is considered the word’s least significant byte and the highest numbered byte the most significant.
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