midterm4.c
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#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
const int FndSelectPin[6] = { 4, 17, 18, 27, 22, 23 };
const int FndPin[8] = { 6, 12, 13, 16, 19, 20, 26, 21 };
const int FndFont[10] = { 0x3F, 0x06, 0x5B, 0x4F, 0x66,
0x6D, 0x7D, 0x07, 0x7F, 0x67 };
void init(){
int i;
if( wiringPiSetupGpio() == -1 ){
printf( "wiringPiSetupGpio() error\n" );
exit(-1);
}
for(i=0;i<6;i++){
pinMode( FndSelectPin[i], OUTPUT );
digitalWrite( FndSelectPin[i], HIGH );
}
for(i=0;i<8;i++){
pinMode( FndPin[i], OUTPUT );
digitalWrite( FndPin[i], LOW );
}
}
void FndSelect(int position){
int i;
for(i=0;i<6;i++){
if(i==position){
digitalWrite(FndSelectPin[i],LOW);
}
else{
digitalWrite(FndSelectPin[i],HIGH);
}
}
}
void FndDisplay(int position, int num){
int i,number;
int flag=0;
int shift=0x01;
number=FndFont[num];
if(position==2)
number|=0x80;
for(i=0;i<8;i++){
flag=(number&shift);
digitalWrite(FndPin[i], flag);
shift<<=1;
}
FndSelect(position);
}
int main(){
int pos;
int time=0;
init();
unsigned long prevtime=millis();
while(1){
unsigned long curtime=millis();
if(curtime-prevtime >= 9){
prevtime=curtime;
time++;
}
int data[6]={time%10, (time%100)/10, (time%1000)/100,
(time/1000)%10, (time/10000)%10, time/100000};
for(pos=0;pos<6;pos++){
FndDisplay(pos,data[pos]);
delay(1);
}
}
return 0;
}