数码管驱动程序，使用tm1620作为驱动芯片-Nixie tube driver, use the chips as a driver tm1620

数据管驱动芯片TM1620 51单片机C程序，实现数码管显示功能及亮度控制；并有以四位数码管为基础的自检功能。-Data tube driver chip TM1620 51 microcontroller C procedures, functions and digital display brightness control and has to four digital tube-based self-test function.