用c语言写的单片机按键程序，数码管显示，第一个程序是稳定的显示654321。第二个程序是随着按键显示543210 654321 ··· fedcba。第三个是显示1 21 321 ···654321 ···fedcba。等几个不同的单片机程序。-Using c language key procedures, digital display, the first program is a stable display 654321. The second program, with the key display 543210 654321 fedcba. The third is to show 1 21 321 6543 21 fedcba. And several different microcontroller program.