|
＃i nclude <REG51.H>
＃i nclude <ABSACC.H>
#define uchar unsigned char
#define uint unsigned int
#define DAC0832 XBYTE[0x6000]
uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
0x07,0x7f,0x6f};
uchar code act[3]={0xfe,0xfd,0xfb};
sbit P1_7=P1^7;
sbit INC_KEY=P2^5;
sbit DEC_KEY=P2^4;
void delay(uint k);
int cnt;
/******************************/
void main(void)
{
TMOD=0x01;
TH0=-(1000/256);
TL0=-(1000%256);
TR0=1;
IE=0x82;
while(1)
{
if(!INC_KEY)
{delay(30);
if(!INC_KEY)cnt++;
if(cnt>255)cnt=255;
delay(100);}
//==============
if(!DEC_KEY)
{delay(30);
if(!DEC_KEY)cnt--;
if(cnt<0)cnt=0;
delay(100);}
/*****************************/
DAC0832=cnt;
}
}
/************************************/
void delay(uint k) //延时k*1mS子函数
{
uint i,j;
for(i=0;i<k;i++){
for(j=0;j<60;j++)
{;}}
}
/***********************************/
void timer0(void) interrupt 1 using 1
{static uchar disbit;
TH0=-(1000/256);
TL0=-(1000%256);
switch(disbit)
{
case 0:{P1=SEG7[(cnt*49/25)/100];P1_7=1;}break;
case 1:{P1=SEG7[(cnt*49/25)%100/10];}break;
case 2:{P1=SEG7[(cnt*49/25)%100%10];}break;
default:break;
}
P2=act[disbit];
disbit++;
if(disbit>2)disbit=0;
} |
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