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 state = 2;
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 start() {
state = 0;
}
void stop() {
state = 1;
}
void reset() {
time = 0;
int i;
for (i = 0; i < 6; i++)
data[i] = 0;
state = 2;
timer();
}
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);
}
int main(){
init();
if (wiringPiISR(Keypad[0], INT_EDGE_FALLING, &start) < 0) {
return 1;
}
if (wiringPiISR(Keypad[1], INT_EDGE_FALLING, &stop) < 0) {
return 1;
}
if (wiringPiISR(Keypad[2], INT_EDGE_FALLING, &reset) < 0) {
return 1;
}
while (1) {
if (state == 0) {
unsigned long prevtime = millis();
while (1) {
if (state > 0) break;
unsigned long curtime = millis();
if (curtime - prevtime >= 9) {
prevtime = curtime;
time++;
}
data[0] = time % 10;
data[1] = (time % 100) / 10;
data[2] = (time % 1000) / 100;
data[3] = (time / 1000) % 10;
data[4] = (time / 10000) % 10;
data[5] = time / 100000;
timer();
}
}
else {
while (1) {
if (state == 0) break;
timer();
}
}
}
return 0;
}