项目二任务4-K1-K4按键状态显示2课时

1、12022-1-62任务目标v通过4个独立式按键控制数码管数字显示的设计与仿真演示，熟悉独立式按键编程方法。任务要求v1、采用项目二任务4的仿真电路，编写代码完成K1-K4按键控制数码管显示数字1-4效果；v2、建立工程2-4-1，采用if选择结构完成要求；v3、建立工程2-4-2，采用switch形式完成要求；v4、建立工程2-4-3，完成进阶要求。任务提示v单片机对按键的检测是通过I/O口电平变化；v按键检测时要注意去抖动。2022-1-65仿真电路p4p5p6p7p15p8p9p10p11p12p13p14p0p1p2p3XTAL218XTAL119ALE30EA31PSEN29RST9

2、P0.0/AD039P0.1/AD138P0.2/AD237P0.3/AD336P0.4/AD435P0.5/AD534P0.6/AD633P0.7/AD732P1.01P1.12P1.23P1.34P1.45P1.56P1.67P1.78P3.0/RXD10P3.1/TXD11P3.2/INT012P3.3/INT113P3.4/T014P3.7/RD17P3.6/WR16P3.5/T115P2.7/A1528P2.0/A821P2.1/A922P2.2/A1023P2.3/A1124P2.4/A1225P2.5/A1326P2.6/A1427U1AT89C51net=p18X1CRYSTA

3、LC130pFC210uFC330pFR110k代码解析v#includereg51.hv#define uint unsigned intv#define uchar unsigned charvsbit key1=P10;vsbit key2=P11;vsbit key3=P12;vsbit key4=P13;v uchar code num10=0 xc0,0 xf9,0 xa4,0 xb0,0 x99,0 x92,0 x82,0 xf8,0 x80,0 x90;v delay(uint t)v v uint i,j;v for(i=0;i0;j-);v v main()v v P2=n

4、um0;v while(1)v v vif(key1=0)vvP2=num1;vv if(key2=0)vvP2=num2;vv if(key3=0)vvP2=num3;vv if(key4=0)vvP2=num4;vv v实战训练v仿真成功后，将代码下载到试验箱继续调试；v按三种方式完成要求。进阶要求v1、key1按键进行加1操作，按下一次数码管数字加1；v2、key2按键进行减1操作，按下一次数码管数字减1；vkey3按键进行复位操作，按下一次数码管数字归0；代码解析v#includereg51.hv#define uint unsigned intv#define uchar unsig

5、ned charvsbit key1=P10;vsbit key2=P11;vsbit key3=P12;vsbit key4=P13;v uchar code num10=0 xc0,0 xf9,0 xa4,0 xb0,0 x99,0 x92,0 x82,0 xf8,0 x80,0 x90;v delay(uint t)v v uint i,j;v for(i=0;i0;j-);v v main()v int n=0;v P2=num0;v while(1)v v 代码解析vif(key1=0)vv while(key1=0);vvn+;vP2=numn;vif(n=9)vn=0;vvv if(key2=0)vv while(key2=0);vv n-;vP2=numn;vif(n=0|n=-1)vn=9; vvvv if(key3=0)vv