起初是为了方便后续数码管显示设备对数值显示的驱动管理方案。后来用来驱动1602、12864的数值显示也有很好的效果。具备的字符缓冲流，进行数值提取和释放。-At first is to facilitate the subsequent numerical digital display device display driver management program. Later, the values ​ ​ used to drive 1602,12864 display also has a good effect. Have the character buffer flow, numerical extraction and released.