tur
4elseifa0xedretur
8elseifa0xeeretur
12elseifa0xd7retur
1elseifa0xdbretur
5elseifa0xddretur
9elseifa0xderetur
13
elseifa0xb7retur
2elseifa0xbbretur
6elseifa0xbdretur
10elseifa0xberetur
14elseifa0x77retur
3elseifa0x7bretur
7elseifa0x7dretur
11elseifa0x7eretur
15
felseretur
8888
ucharkeysca
P20xfetempP2temptemp0xf0whiletemp0xf0delay5tempP2temptemp0xf0whiletemp0xf0tempP2switchtempcase0xee
um12breakcase0xde
um13breakcase0xbe
um14breakcase0x7e
um15breakwhiletemp0xf0tempP2temptemp0xf0P20xfdtempP2temptemp0xf0whiletemp0xf0delay5键盘扫描
ftempP2temptemp0xf0whiletemp0xf0tempP2switchtempcase0xed
um8breakcase0xdd
um9breakcase0xbd
um10breakcase0x7d
um11breakwhiletemp0xf0tempP2temptemp0xf0
P20xfbtempP2temptemp0xf0whiletemp0xf0delay5tempP2temptemp0xf0whiletemp0xf0tempP2switchtempcase0xeb
um4breakcase0xdb
um5breakcase0xbb
um6break
fcase0x7b
um7breakwhiletemp0xf0tempP2temptemp0xf0P20xf7tempP2temptemp0xf0whiletemp0xf0delay5tempP2temptemp0xf0whiletemp0xf0tempP2switchtempcase0xe7
um0breakcase0xd7
um1breakcase0xb7
um2breakcase0x77
um3breakwhiletemp0xf0tempP2temptemp0xf0retur
um4X4键盘e
d
输入

4
位数码管
输出
f主函数voidmai
voidu
sig
edchariwhile1pkeysca
p6789digital_display
fr