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标题: 定时器应用C语言程序 [打印本页]

作者: 苹果也疯狂 时间: 2015-3-15 21:45 标题: 定时器应用C语言程序

#Include "Stdio.H"

#Include "Reg51.H"

// 0 - 9 的编码

Unsigned Char Code Table[] = { 0x11,0xb7,0x29,0x23,0x87,0x43,0x41,0x37,0x01,0x03,0x00 };

Unsigned Int Count2;

//第1－6 位的片选线

Unsigned Char Code Dig[] = { 0x7f,0xfd,0xdf,0xf7,0xef,0xfb };

Unsigned Char Buffer[8],Val[6];

Unsigned Char Count1,Scan,I,Ch,KeyVal,Modify,OverTime;

Bit FKey,FSec,Key1,Key2,Key3,OldKey1,OldKey2,OldKey3,Blink,FTimer,FSTOP;

Unsigned Long Int Cn,Tmp;

Void Init(Void);

Void Display(Void);

Void Cal_cn(Void);

Void Cal_val(Void);

Main()

{

Init();

While(1) {

If(FSec) { // 秒标志被置位？

FSec = 0; // 清除秒标志

If(!FSTOP && Modify==0) {

If(Cn!=0) Cn--; Else { FTimer = 1; FSTOP = 1; }

}

Display();

}

If(FKey) { // 有按键按下？

FKey = 0; // 清除按件标志，并处理该按键

If(KeyVal==1) { // 是调整按钮？

FSTOP = 0; Modify++; // 进入相应状态，并重置超时定时器

If(Modify==7) { Modify = 0; OverTime = 0; } Else OverTime = 10;

}

If(KeyVal==2 && Modify!=0) { // ＋1按钮，相应位＋1

Cal_val();

If(Val[Modify-1]<9) Val[Modify-1]++;

Cal_cn();

Display(); OverTime = 10; // 刷新显示，并重置超时定时器

}

If(KeyVal==3 && Modify!=0) { // －1按钮，相应位－1

Cal_val();

If(Val[Modify-1]>0) Val[Modify-1]--;

Cal_cn();

Display(); OverTime = 10; // 刷新显示，并重置超时定时器

}

}

}

}

Void Init(Void) {

Count1 = Count2 = 0; Scan = 0; KeyVal = 0;

Cn = 0; For(I=0;I<6;I++) Val[I] = 0;

FKey = 0; Modify = 0; Blink = 0; OverTime = 0; FTimer = 0; FSTOP = 0;

Key1 = Key2 = Key3 = 0;

OldKey1 = OldKey2 = OldKey3 = 1;

For(I=0;I<6;I++) Buffer[I] = 0;

TCON &= 0xCF; // 初始化Timer0

TMOD &= 0xF0;

TMOD |= 0x01;

TH0 = TL0 = 0;

EA = 1;

ET0 = 1;

TR0 = 1;

}

Timerint () Interrupt 1 {

TR0 = 0;

TL0 = 0x12;

TH0 = 0xf7; // 0xf712 For 2.5ms

TR0 = 1;

If(Scan==1 && !FKey) { // 扫描调整按钮

Key1 = P30;

If(!Key1 && OldKey1) { FKey = 1; KeyVal = 1; }

}

If(Scan==3 && !FKey) { // 扫描＋1按钮

Key2 = P30;

If(!Key2 && OldKey2) { FKey = 1; KeyVal = 2; }

}

If(Scan==4 && !FKey) { // 扫描-1按钮

Key3 = P30;

If(!Key3 && OldKey3) { FKey = 1; KeyVal = 3; }

}

OldKey1 = Key1; OldKey2 = Key2; OldKey3 = Key3;

P1 = 0xff; P3 = Dig[Scan];

Ch = Buffer[Scan]; // 依次显示6位

If(Modify==0) {

If(FTimer) P1 = Table[Ch] & 0xfe; // 倒计时结束，启动P10（P10低电平）

Else P1 = Table[Ch];

}

Else If(Modify==1 && Blink && Scan==0) P1 = 0xff;

Else If(Modify==2 && Blink && Scan==1) P1 = 0xff;

Else If(Modify==3 && Blink && Scan==2) P1 = 0xff;

Else If(Modify==4 && Blink && Scan==3) P1 = 0xff;

Else If(Modify==5 && Blink && Scan==4) P1 = 0xff;

Else If(Modify==6 && Blink && Scan==5) P1 = 0xff;

Else P1 = Table[Ch];

Scan++; If(Scan==6) Scan = 0;

Count1++;

If(Count1==200) { Count1 = 0; Blink = ~Blink; } // 0.5s闪烁定时器

Count2++;

If(Count2==400) {

Count2 = 0; FSec = 1; FTimer = 0; // 秒脉冲标志置位，并关闭P10输出

If(OverTime) { OverTime--; If(OverTime==0) Modify = 0; } // 10s超时定时器

}

}

Void Cal_cn(Void) {

Cn = 0;

For(I=0;I<6;I++) {

Cn *= 10; Cn += Val[I];

}

}

Void Cal_val(Void) {

Tmp = Cn;

For(I=0;I<6;I++) {

Val[5-I] =(Unsigned Char) ( Tmp % 10 );

Tmp = Tmp / 10;

}

}

Void Display(Void) {

Tmp = Cn;

For(I=0;I<6;I++) {

Buffer[5-I] =(Unsigned Char) ( Tmp % 10 );

Tmp = Tmp / 10;

}

}

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