2022年12月07日 | Proteus入门单片机（4）例程分析

硬件连接：

P1.0-P1.7连接led1到led8

P0.0-P0.7连接led9到led16

P2.1连接模式按键

P2.4连接加速按键

P2.5连接减速按键

P3.0-P3.7连接共阳极数码管

现象：

上电后led1到led16循环点亮（一瞬间只有一个在亮），此时数码管显示零

按下模式按键，数码管变为1，led点亮方式发生变化，一共有0-8九种模式

在每种模式下都可以加速减速，效果在其余模式保留，最快最慢无法判定

代码：

#include

unsigned char RunMode;

//**********************************System Fuction*************************************************

void Delay1ms(unsigned int count)

{

unsigned int i,j;

for(i=0;i for(j=0;j<120;j++);

}

unsigned char code LEDDisplayCode[] = { 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8, //0~7

                                 0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xFF};

void Display(unsigned char Value)

{

P3 = LEDDisplayCode[Value];

}

void LEDFlash(unsigned char Count)

{

unsigned char i;

bit Flag;

for(i = 0; i {

Flag = !Flag;

if(Flag)

Display(RunMode);

else

Display(0x10);

Delay1ms(100);

}

Display(RunMode);

}

unsigned char GetKey(void)

{

unsigned char KeyTemp,CheckValue,Key = 0x00;

CheckValue = P2&0x32;

if(CheckValue==0x32)

return 0x00;

Delay1ms(10);

KeyTemp = P2&0x32;

if(KeyTemp==CheckValue)

return 0x00;

if(!(CheckValue&0x02))

Key|=0x01;

if(!(CheckValue&0x10))

Key|=0x02;

if(!(CheckValue&0x20))

Key|=0x04;

return Key;

}

unsigned int TimerCount,SystemSpeed,SystemSpeedIndex;

void InitialTimer2(void)

{

T2CON  = 0x00; //16 Bit Auto-Reload Mode

  TH2 = RCAP2H = 0xFC;  //重装值,初始值

TL2 = RCAP2L = 0x18;

ET2=1; //定时器 2 中断允许

TR2 = 1; //定时器 2 启动

EA=1;

}

unsigned int code SpeedCode[]={   1,   2,   3,   5,   8,  10,  14,  17,  20,  30,

40,  50,  60,  70,  80,  90, 100, 120, 140, 160,

180, 200, 300, 400, 500, 600, 700, 800, 900,1000};//30

void SetSpeed(unsigned char Speed)

{

SystemSpeed =SpeedCode[Speed];

}

void LEDShow(unsigned int LEDStatus)

{

P1 = ~(LEDStatus&0x00FF);

P0 = ~((LEDStatus>>8)&0x00FF);

}

void InitialCPU(void)

{

RunMode = 0x00;

TimerCount = 0;

SystemSpeedIndex = 10;

P1 = 0x00;

P0 = 0x00;

P2 = 0xFF;

P3 = 0x00;

Delay1ms(500);

P1 = 0xFF;

P0 = 0xFF;

P2 = 0xFF;

P3 = 0xFF;

SetSpeed(SystemSpeedIndex);

Display(RunMode);

}

//Mode 0

unsigned int LEDIndex = 0;

bit LEDDirection = 1,LEDFlag = 1;

void Mode_0(void)

{

LEDShow(0x0001< LEDIndex = (LEDIndex+1)%16;

}

//Mode 1

void Mode_1(void)

{

LEDShow(0x8000>>LEDIndex);

LEDIndex = (LEDIndex+1)%16;

}

//Mode 2

void Mode_2(void)

{

if(LEDDirection)

LEDShow(0x0001< else

LEDShow(0x8000>>LEDIndex);

if(LEDIndex==15)

LEDDirection = !LEDDirection;

   LEDIndex = (LEDIndex+1)%16;

}

//Mode 3

void Mode_3(void)

{

if(LEDDirection)

LEDShow(~(0x0001< else

LEDShow(~(0x8000>>LEDIndex));

if(LEDIndex==15)

LEDDirection = !LEDDirection;

   LEDIndex = (LEDIndex+1)%16;

}

//Mode 4

void Mode_4(void)

{

if(LEDDirection)

{

if(LEDFlag)

LEDShow(0xFFFE<     else

LEDShow(~(0x7FFF>>LEDIndex));

}

else

{

if(LEDFlag)

LEDShow(0x7FFF>>LEDIndex);

else

LEDShow(~(0xFFFE< }

if(LEDIndex==15)

{

LEDDirection = !LEDDirection;

if(LEDDirection) LEDFlag = !LEDFlag;

}

    LEDIndex = (LEDIndex+1)%16;

}

//Mode 5

void Mode_5(void)

{

if(LEDDirection)

LEDShow(0x000F< else

LEDShow(0xF000>>LEDIndex);

if(LEDIndex==15)

LEDDirection = !LEDDirection;

    LEDIndex = (LEDIndex+1)%16;

}

//Mode 6

void Mode_6(void)

{

if(LEDDirection)

LEDShow(~(0x000F< else

LEDShow(~(0xF000>>LEDIndex));

if(LEDIndex==15)

LEDDirection = !LEDDirection;

    LEDIndex = (LEDIndex+1)%16;

}

//Mode 7

void Mode_7(void)

{

if(LEDDirection)

LEDShow(0x003F< else

LEDShow(0xFC00>>LEDIndex);

if(LEDIndex==9)

LEDDirection = !LEDDirection;

    LEDIndex = (LEDIndex+1)%10;

}

//Mode 8

void Mode_8(void)

{

LEDShow(++LEDIndex);

}

void TimerEventRun(void)

{

if(RunMode==0x00)

{

Mode_0();

}

else if(RunMode ==0x01)

{

Mode_1();

}

else if(RunMode ==0x02)

{

Mode_2();

}

else if(RunMode ==0x03)

{

Mode_3();

}

else if(RunMode ==0x04)

{

Mode_4();

}

else if(RunMode ==0x05)

{

Mode_5();

}

else if(RunMode ==0x06)

{

Mode_6();

}

else if(RunMode ==0x07)

{

Mode_7();

}

else if(RunMode ==0x08)

{

Mode_8();

}

}

void Timer2(void) interrupt 5 using 3

{

TF2 = 0; //中断标志清除( Timer2 必须软件清标志!)

if(++TimerCount>=SystemSpeed)

{

TimerCount = 0;

TimerEventRun();

    }

}

unsigned char MusicIndex = 0;

void KeyDispose(unsigned char Key)

{

if(Key&0x01)

{

LEDDirection = 1;

LEDIndex = 0;

LEDFlag = 1;

RunMode = (RunMode+1)%9;

Display(RunMode);

}

if(Key&0x02)

{

if(SystemSpeedIndex>0)

{

--SystemSpeedIndex;

SetSpeed(SystemSpeedIndex);

}

else

{

LEDFlash(6);

}

}

if(Key&0x04)

{

if(SystemSpeedIndex<28)

{

++SystemSpeedIndex;

SetSpeed(SystemSpeedIndex);

}

else

{

LEDFlash(6);

}

}

}

//***********************************************************************************

main()

{

unsigned char Key;//定义一个局部变量

InitialCPU();

InitialTimer2();

while(1)

{

Key = GetKey();

if(Key!=0x00)

{

KeyDispose(Key);

}

}

}

如何阅读别人的代码：

1.复制到自己习惯的环境，改为自己习惯的方式，边读边添加注释

2.从主函数开始阅读（自上而下），因为自定义函数和变量都会在主函数被调用

解释：

看主程序可以知道上来先做了一些初始化，包括模式设置和定时器设置

在循环里，等待按键到来，按键按下后先调整模式，此时只有数码管产生变化，中断到了才会影响到led，速度的改变是通过改变中断次数实现的。