利用总线方式，实现在LED上显示键盘输入的字符，并循环移位显示，带有功能键，实现移位方向及移位速度的变化-The use of bus ways to achieve the LED display keyboard characters, and cyclic shift display with function keys, shift direction and shift to achieve the speed of change

STM32 AMV video player using STM32vldiscovery board ( Keyl MDK )