pic单片机4位数码管显示-1-9999循环点亮.doc

#include <pic.h> //调用头文件，可以去PICC软件下去查找PIC16F87XA单片机的头文件
__CONFIG(0x1832);
//芯片配置字，看门狗关，上电延时开，掉电检测关，低压编程关，加密，4M晶体HS振荡
#define DS1 RA1
#define DS2 RA2
#define DS3 RA3
#define DS4 RA5
#define B20 RA4
#define uchar unsigned char
#define uint unsigned int
unsigned char unm;
const unsigned char str[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00,0x40} ; //共阴数码管字码表
const unsigned char str1[]={0x0bf,0x86,0x0db,0x0cf,0x0e6,0x0ed,0x0fd,0x87,0x0ff,0x0ef}; //个位带小数点字码表
//const unsigned char wei[4]={COL1+COL2+COL3+COL4};//{0x001,0x002,0x004,0x008};

/**********ds1820程序************/
void delay(unsigned int i) //延时1微秒
{
for(i=100;i--;);
}
void init(void) //主板初始化
{

TRISD=0X00;
TRISA=0X00;
PORTA=0X00;
PORTD=0X00;

}

/************主程序**********/
uchar smg()
{
init();

unsigned char j;
unsigned int i,a,bit1000,bit100,bit10,bit1;

DS1=1;
DS2=1;
DS3=1;
DS4=1;

while(1)
{
for( i=1; i <= 9999;i++)
{
a=i;
bit1000=a/1000;//提取千位
a=a%1000;

bit100=a/100;//提取百位
a=a%100;

bit10=a/10;//提取十位
bit1=a%10;//提取个位

for( j=1; j <= 20;j++)
{
DS4=0;
PORTD=str[bit1];
DS1=1; //个位的位选
delay(2);//*延时5mS*

DS1=0;
PORTD=str1[bit10];
DS2=1; //十位的位选
delay(2);//*延时5mS

DS2=0;
PORTD=str[bit100];
DS3=1; //百位的位选
delay(2);//*延时5mS

DS3=0;
PORTD=str[bit1000];
DS4=1; //千位的位选
delay(2);//*延时5mS*/

}
}
}
}