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串口中断结束不需要清中断
https://blog.csdn.net/justsure91/article/details/80856345
MODBUS详细介绍
https://blog.csdn.net/u014234260/article/details/76986814
c语言modbus-RTU CRC校验
https://blog.csdn.net/ma950924/article/details/82747285
C语言一行太长的换行处理
https://blog.csdn.net/baiqishijkh/article/details/79236202
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