stm32&A8_通信

* A8定时向stm32发送10个字节的字符数组作为命令帧
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stm32modbus地址0x01，用于测试的命令帧：0x01,0x01,0x01,0x00,0x00,0x49,0xFC,0x00,0x00,0x00.CRC16H:0x49,CRC16L:0xFC.