C51课程列表
单片机入门必学的一些课程
按键计数器
#include <Reg52.h >
sbit key=P3^1;//jian
char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; //0-9
int n = 0;
void disp_7seg(int num);
void delay(int i)
{
int x,y;
for(x=i;x>0;x--)
for(y=255;y>0;y--);
}
void main()
{
while(1)
{
disp_7seg(n);
if(key==0)
{
delay(20);
if(key==0)
{
n++;
}
while (key==0);
}
}
}
void disp_7seg(int num)
{
P2 = 0xFE;//1111 1110;
P0 = table[num/1000];
delay(2);
P2 = 0xFD;//1111 1101;
P0 = table[num%1000/100];
delay(2);
P2 = 0xFB;//1111 1011;
P0 = table[num%100/10];
delay(2);
P2 = 0xF7;//1111 0111;
P0 = table[num%10];
delay(2);
}
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