说明：  和大彩串口屏串口通讯的接收程序，HAL库提供的接收程序不是中断方式。程序为任意字节长度数据包中断接收，利用串口空闲中断实现
(The receiving program that communicates with the serial port screen of the big color serial port, the receiving program provided by the HAL library is not an interrupt mode. The program interrupts the reception of data packets of any byte length, using the serial port idle interrupt)