標題:
單片機倒計時程序按鍵只能加減秒和分不能控制時
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作者:
lj2443454061
時間:
2022-4-9 20:06
標題:
單片機倒計時程序按鍵只能加減秒和分不能控制時
初始倒計時設置了djfen的值但是仿真顯示不出來，只能顯示設置的djmiao，還有按鍵按到小時設置的時候不能加也不能減，只能加減秒和分，不知道又是哪里有問題了，求解決呀
單片機源程序如下:
#include <reg52.h>
#include <intrins.h>
#include <lcd.h>
#define uchar unsigned char
#define uint unsigned int
sbit key1=P3^0; //設置鍵
sbit key2=P3^1; //加鍵
sbit key3=P3^2; //減鍵
sbit key4=P3^3; //開始鍵
sbit beep=P2^4;
sbit trig=P1^7;
sbit echo=P1^6;
sbit RS=P2^0;
sbit RW=P2^1;
sbit EN=P2^2;
uchar djshi,djfen=1,djmiao=8;
uchar r,num,s,i;
uchar distance,t;
bit flag=0;
bit flag1s=0;
uchar code table1[]={"time: 00:00:00 "};
uchar code table2[]={" "};
uchar code table3[13]={'0','1','2','3','4','5','6','7','8','9','.','-','M'};
uchar code table4[]={"xdz："};
uchar cc[4]={0,0,0,0};
void startmodule();
void start();
void count();
void LcdInit() //LCD初始化子程序
{
uchar i;
lcd_writecom(0x38); //開顯示
lcd_writecom(0x0c); //開顯示不顯示光標
lcd_writecom(0x06); //寫一個指針加1
lcd_writecom(0x01); //清屏
lcd_writecom(0x80); //設置數(shù)據(jù)指針起點
for(i=0;i<16;i++)
{
lcd_writedate(table1[ i]);[ i]
}
}
void Timer0Init(void) //
{
TMOD |= 0x01; //使用定時器T0的模式1 定時器T1的模式1
TL0 = 15536%256; //設置定時0初值
TH0 = 15536/256; //設置定時0初值
TR0 = 1; //定時器0開始計時
ET0=1;
EA=1;
}
void Timer1Init(void) //
{
TMOD |= 0x10; //使用定時器T0的模式1 定時器T1的模式1
TL1 = 0; //設置定時0初值
TH1 = 0; //設置定時0初值
TF1=0;
TR1 = 1; //定時器0開始計時
ET0=1;
EA=1;
}
void Delay1ms(uint n)
{
uint x,y;
for(x=n;x>0;x--)
for(y=110;y>0;y--);
}
void write_sfm(uchar add,uchar date)
{
lcd_writecom(0x80+add);
lcd_writedate(date/10+0x30);
lcd_writedate(date%10+0x30);
lcd_writecom(0x80+add+1);
}
void keyscan()
{
if(key1==0)
{
Delay1ms(5);
if(key1==0)
{
num++;
TR0=0;
while(!key1);
if(num==1)
{
lcd_writecom(0x0f);
lcd_writecom(0x8D);
}
if(num==2)
{
lcd_writecom(0x8A);
}
if(num==3)
{
lcd_writecom(0x87);
num=0;
}
}
}
if(num==1)
{
if(key2==0)
{
Delay1ms(5);
if(key2==0)
{
djmiao++;
while(!key2);
if(djmiao==60)
djmiao=0;
lcd_writecom(0x8c);
lcd_writedate(djmiao/10+0x30);
lcd_writedate(djmiao%10+0x30);
lcd_writecom(0x8D);
}
}
if(key3==0)
{
Delay1ms(5);
if(key3==0)
{
djmiao--;
while(!key3);
if(djmiao==255)
djmiao=59;
lcd_writecom(0x8c);
lcd_writedate(djmiao/10+0x30);
lcd_writedate(djmiao%10+0x30);
lcd_writecom(0x8D);
}
}
}
if(num==2)
{
if(key2==0)
{
Delay1ms(5);
if(key2==0)
{
djfen++;
while(!key2);
if(djfen==60)
djfen=0;
lcd_writecom(0x89);
lcd_writedate(djfen/10+0x30);
lcd_writedate(djfen%10+0x30);
lcd_writecom(0x8A);
}
}
if(key3==0)
{
Delay1ms(5);
if(key3==0)
{
djfen--;
while(!key3);
if(djfen==255)
djfen=59;
lcd_writecom(0x89);
lcd_writedate(djfen/10+0x30);
lcd_writedate(djfen%10+0x30);
lcd_writecom(0x8A);
}
}
}
if(num==3)
{
if(key2==0)
{
Delay1ms(5);
if(key2==0)
{
djshi++;
while(!key2);
if(djshi==24)
djshi=0;
lcd_writecom(0x86);
lcd_writedate(djshi/10+0x30);
lcd_writedate(djshi%10+0x30);
lcd_writecom(0x88);
}
}
if(key3==0)
{
Delay1ms(5);
if(key3==0)
{
djshi--;
while(!key3);
if(djshi==255)
djshi=23;
lcd_writecom(0x86);
lcd_writedate(djshi/10+0x30);
lcd_writedate(djshi%10+0x30);
lcd_writecom(0x88);
}
}
}
if(key4==0)
{
Delay1ms(5);
if(key4==0)
{
TR0=1;
lcd_writecom(0x0c);
}
}
}
void fmq()
{
beep=1;
Delay1ms(5);
beep=0;
Delay1ms(5);
}
void main()
{
LcdInit();
Timer0Init();
Timer1Init();
trig=0;
Delay1ms(1000);
while(1)
{
if(flag1s)
{
flag1s=0;
startmodule();
start();
count();
}
keyscan();
if(djshi==0 && djfen==0 &&djmiao==0) //倒計時時間到
{
TR0=0; //停止計時
fmq();
}
}
}
void Timer0() interrupt 1
{
TL0 = 15536%256; //設置定時初值
TH0 = 15536/256; //設置定時初值
r++;
if(r==20)
{
r=0;
djmiao--;
if(djmiao==255)
{
djmiao=59;
djfen--;
if(djfen==255)
{
djfen=59;
djshi--;
if(djshi==255)
{
djshi=0;
}
if(djshi==0)
djfen=59;
if(djfen==0&djshi==0)
djfen=0;
write_sfm(6,djshi);
}
write_sfm(9,djfen);
}
write_sfm(12,djmiao);
flag1s=1;
}
}
void startmodule()
{
trig=1;
_nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_();
trig=0;
}
void start()
{
while(!echo); //當Echo為零時等待
TR1=1; //開啟
while(echo); //當Echo為1計數(shù)并等待
TR1=0; //關閉
void count()
{
t=TH1*256+TL1;
TH1=0;
TL1=0;
distance=t/58.0;
cc[0]=distance/1000%10;
cc[1]=distance/100%10;
cc[2]=distance/10%10;
cc[3]=distance/1%10;
}
作者:
lkc8210
時間:
2022-4-9 23:23
if(num==3)
{
lcd_writecom(0x87);
}
if(num==4)num=0;
復制代碼
作者:
zhxiufan
時間:
2022-4-10 08:20
加一條語句：num++;num%=4;
作者:
樹根l
時間:
2022-4-13 17:27
請問if（djfen==255）中的255是什么意思呀
作者:
lkc8210
時間:
2022-4-14 09:14
樹根l 發(fā)表于 2022-4-13 17:27
請問if（djfen==255）中的255是什么意思呀
因為djfen的類型是unsinged char 范圍是0~255 沒有負數(shù)
前一句是djfen--;
djfen==255就是檢查djfen有沒有溢出
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