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 } 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< } //Mode 1 void Mode_1(void) { LEDShow(0x8000>>LEDIndex); LEDIndex = (LEDIndex+1)%16; } //Mode 2 void Mode_2(void) { if(LEDDirection) LEDShow(0x0001< LEDShow(0x8000>>LEDIndex); if(LEDIndex==15) LEDDirection = !LEDDirection; LEDIndex = (LEDIndex+1)%16; } //Mode 3 void Mode_3(void) { if(LEDDirection) LEDShow(~(0x0001< LEDShow(~(0x8000>>LEDIndex)); if(LEDIndex==15) LEDDirection = !LEDDirection; LEDIndex = (LEDIndex+1)%16; } //Mode 4 void Mode_4(void) { if(LEDDirection) { if(LEDFlag) LEDShow(0xFFFE< 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< LEDShow(0xF000>>LEDIndex); if(LEDIndex==15) LEDDirection = !LEDDirection; LEDIndex = (LEDIndex+1)%16; } //Mode 6 void Mode_6(void) { if(LEDDirection) LEDShow(~(0x000F< LEDShow(~(0xF000>>LEDIndex)); if(LEDIndex==15) LEDDirection = !LEDDirection; LEDIndex = (LEDIndex+1)%16; } //Mode 7 void Mode_7(void) { if(LEDDirection) LEDShow(0x003F< 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。