设计一个点对点的串行通信系统，甲机发送P0及P1口的开关数据，乙机接收并分别在P0及P1的LED灯上显示出来。注：两机采用串口方式2通信，波特率翻倍（或两机采用串口方式1通信，波特率为19.2kbit/s）；甲机采用查询发送，乙机采用中断接收。设计相应的软硬件实现485通信

收发双方加上CRC校验-Design of a point to point serial communication system A sends P0 and P1 port switch data, B receives and were displayed in the P0 and P1 LED lights on. Note: The two machines communicate using serial mode 2, the baud rate doubling (or two machines using serial communication mode, baud rate is 19.2kbit/s)　A machine sends a query, B machine uses interrupt reception. Design the appropriate hardware and software to achieve 485

Plus send and receive both the CRC