Notes

#include<pthread.h>
#include<unistd.h>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<iobb.h>
#include <fcntl.h>
#include <termios.h>
#include<sys/time.h>
#include<float.h>
#include<sched.h>

pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;


#define START_STOP_PIN 18
#define RESET_PIN 17
#define RED_LIGHT 27
#define GREEN_LIGHT 30


float counter=FLT_MAX-5.0;
int is_counter_initialized=0;
int is_reset_button_pressed=0;
int is_start_stop_button_toggled=0;
int prior1=20;
int prior2=50;

void *start_stop_button_thread(){

while(1){
if(is_high(9,START_STOP_PIN) ){
while(is_high(9,START_STOP_PIN)){
continue;
}
if(is_high(9,RED_LIGHT)){
pin_low(9,RED_LIGHT);
pin_high(9,GREEN_LIGHT);
is_reset_button_pressed=0;
pthread_mutex_lock(&counter_mutex);
while(!is_high(9,START_STOP_PIN) && !is_reset_button_pressed){
printf("33[A33[2KTrTime in seconds %.1fn", counter);
if(counter<20){
counter+=0.01;
}
else{
counter=0;
counter+=0.01;
}
usleep(10000);
}
pthread_mutex_unlock(&counter_mutex);
}
else{
pin_low(9,GREEN_LIGHT);
pin_high(9,RED_LIGHT);
printf("33[A33[2KTrTime in seconds %.2fn", counter);
}
}

}
}

void *reset_button_thread(){
while(1){
if(is_high(9,RESET_PIN)){
while(is_high(9,RESET_PIN)){
continue;
}
is_reset_button_pressed=1;

pthread_mutex_lock(&counter_mutex);
counter=0;
pthread_mutex_unlock(&counter_mutex);
printf("33[A33[2KTrTime in seconds %.2f secondsn", counter);
pin_high(9,RED_LIGHT);
pin_low(9,GREEN_LIGHT);
}
}
}

void initialize_gpios(){
iolib_init();
iolib_setdir(9,START_STOP_PIN,DigitalIn);
iolib_setdir(9,RESET_PIN,DigitalIn);
iolib_setdir(9,RED_LIGHT,DigitalOut);
iolib_setdir(9,GREEN_LIGHT,DigitalOut);
pin_high(9,RED_LIGHT);
pin_low(9,GREEN_LIGHT);
}

int main (){

initialize_gpios();

pthread_t start_stop_button,reset_button;

pthread_attr_t start_stop_attr,reset_button_attr;
int ret1,ret2;
struct sched_param param1,param2;

ret1=pthread_attr_init(&start_stop_attr);
ret2=pthread_attr_init(&reset_button_attr);

ret1=pthread_attr_getschedparam(&start_stop_attr,&param1);
ret2=pthread_attr_getschedparam(&reset_button_attr,&param2);

param1.sched_priority=prior1;
param1.sched_priority=prior2;

ret1=pthread_attr_setschedparam(&start_stop_attr,&param1);
ret2=pthread_attr_setschedparam(&reset_button_attr,&param2);

ret1=pthread_create(&start_stop_button,&start_stop_attr,&start_stop_button_thread,NULL);
ret2=pthread_create(&reset_button,&reset_button_attr,&reset_button_thread,NULL);

pthread_join(start_stop_button,NULL);
pthread_join(reset_button,NULL);

iolib_free();
}