该程序同上面的左移程序的核心内容是一样的，但是这里并没有移位也没有使用串口，而是在调整好数据缓冲区的内容后，直接通过I/O口发送的。这里的HC595_send_2byte函数实现了同时发送上下半屏两个字节数据的功能，大大化简了程序。其他基本和上面的程序一样。-The program left the program with the above core content is the same, but where no shift did not use the serial port, but in the adjusted data buffer contents directly through the I/O port to send. Here HC595_send_2byte function to achieve the same time send two bytes of data down a half-screen functionality, greatly simplifying the process. Basic and other procedures as above.