text11.c

电压监控保护程序,多位数码显示,保护电压,和检测

#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;
sbit P30=P3^0;

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;
}

}