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 };
const int Keypad[3] = { 11,9,10 };
int time = 0;
int data[] = { 0,0,0,0,0,0 };
int state = 2;
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 );
}
for (i = 0; i < 3; i++)
pinMode(Keypad[i], INPUT);
if (wiringPiISR(Keypad[1], INT_EDGE_FALLING, &stop) < 0) {
return 1;
}
if (wiringPiISR(Keypad[2], INT_EDGE_FALLING, &reset) < 0) {
return 1;
}
}
int KeypadRead()
{
int i, keypadnum = -1;
for (i = 0; i < 3; i++) {
if (!digitalRead(Keypad[i])) {
state = 1;
keypadnum = i; break;
}
}
return keypadnum;
}
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);
}
void timer() {
int pos;
for (pos = 0; pos < 6; pos++) {
FndDisplay(pos, data[pos]);
delay(1);
}
}
void stop() {
timer();
state = 1;
}
void reset() {
time = 0;
state = 2;
}
int main(){
init();
if (KeypadRead() == 0) {
state = 0;
unsigned long prevtime = millis();
while (1) {
unsigned long curtime = millis();
if (curtime - prevtime >= 9) {
prevtime = curtime;
time++;
}
data[6] = { time % 10, (time % 100) / 10, (time % 1000) / 100,
(time / 1000) % 10, (time / 10000) % 10, time / 100000 };
timer();
}
}
else if (state > 0) {
while (1) {
timer();
}
}
return 0;
}