gpioanalyser/main.c

#define _POSIX_C_SOURCE 199309L
#include <sys/time.h>
#include <time.h>
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include <signal.h>

#include "gpio-raw.h"

bool thread_exit = false;

static void signal_handler(int signo)
{
    thread_exit = true;
}

void* worker(void*)
{
  FILE* fd = fopen("clock.out", "w");
  while (!thread_exit)
    sleep(1);
  fclose(fd);
  return 0;
}

int main(int argc, char* argv[])
{
  signal(SIGINT, signal_handler);
  setup_io();
  INP_GPIO(4); // must use INP_GPIO before we can use OUT_GPIO

  struct timeval t1, t2;
  const int n = argc == 2 ? atoi(argv[1]) : 1000000;
  pthread_t thread;
  pthread_create(&thread, 0, worker, 0);

  gettimeofday(&t1, NULL);
  for (int i = 0; !thread_exit; ++i)
  {
    //GPIO_VALUE(6);
    //tab[i] = GPIO_VALUE(6);
    printf("%i\n", GPIO_VALUE(6));
    //fprintf(fd, "%i\n", v);
    //GPIO_SET = 1<<4;
    //GPIO_CLR = 1<<4;
  }
  gettimeofday(&t2, NULL);
  pthread_join(thread, 0);
  unsigned long long ut1 = (__suseconds_t)(1000000L * t1.tv_sec + t1.tv_usec);
  unsigned long long ut2 = (__suseconds_t)(1000000L * t2.tv_sec + t2.tv_usec);
  std::cout << ut1 << " " << ut2 << " ";
  std::cout << (ut2 - ut1) << " " << (float)(ut2 - ut1) / n << std::endl;
  return 0;
}