为扫描44键盘（编号09，af），按下键后将相应的编号通过串口传送出去。i
cludereg52hdefi
erowkeyP20x0fu
sig
edcharkeycodevoidsca
ervoiddelayu
sig
edcharmsvoidputcharstr
fvoidmai
寄存器初始化SCON0x50TMOD0x20TH10xFATR11PCON0x80while1sca
ervoidsca
ercharcolrowcharsca
keyi
sca
0xefforcol0col4colP2sca
keyi
rowkeyifkeyi
0delay100forrow0row4rowifkeyi
0x01rowkeycoderow4colSBUFkeycodewhileTI0TI0whilerowkey0delay100sca
sca
10x01voiddelayu
sig
edcharms扫描键盘函数
以下3行为发送代码
键盘防抖
fu
sig
edchariwhilemsfori0i124i
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