示例#1
0
文件: gpio.c 项目: Mast3rPlan/libsoc
int
libsoc_gpio_free (gpio * gpio)
{
  char tmp_str[STR_BUF];
  int fd;

  if (gpio == NULL)
    {
      libsoc_gpio_debug (__func__, -1, "invalid gpio pointer");
      return EXIT_FAILURE;
    }

  libsoc_gpio_debug (__func__, gpio->gpio, "freeing gpio");

  if (gpio->callback != NULL)
    {
      printf ("Freeing callback!\n");
      // Turn off the callback if there is one enabled
      libsoc_gpio_callback_interrupt_cancel (gpio);
    }

  if (file_close (gpio->value_fd) < 0)
    return EXIT_FAILURE;

  if (gpio->shared == 1)
    {
      free (gpio);
      return EXIT_SUCCESS;
    }

  fd = file_open ("/sys/class/gpio/unexport", O_SYNC | O_WRONLY);

  if (fd < 0)
    return EXIT_FAILURE;

  sprintf (tmp_str, "%d", gpio->gpio);

  if (file_write (fd, tmp_str, STR_BUF) < 0)
    return EXIT_FAILURE;

  if (file_close (fd) < 0)
    return EXIT_FAILURE;

  sprintf (tmp_str, "/sys/class/gpio/gpio%d", gpio->gpio);

  if (file_valid (tmp_str))
    {
      libsoc_gpio_debug (__func__, gpio->gpio, "freeing failed");
      return EXIT_FAILURE;
    }

  free (gpio);

  return EXIT_SUCCESS;
}
示例#2
0
int main(void) {
  // Enable debug output
  libsoc_set_debug(1);

  // Request gpios
  gpio_output = libsoc_gpio_request(GPIO_OUTPUT, LS_SHARED);
  gpio_input = libsoc_gpio_request(GPIO_INPUT, LS_SHARED);

  // Set direction to OUTPUT
  libsoc_gpio_set_direction(gpio_output, OUTPUT);
  
  // Set direction to INPUT
  libsoc_gpio_set_direction(gpio_input, INPUT);

  // Set edge to BOTH
  libsoc_gpio_set_edge(gpio_input, BOTH);

  // Setup callback
  libsoc_gpio_callback_interrupt(gpio_input, &callback_test, 
                      (void*) &interrupt_count);
  
  printf("Push the button...\n"); 
  // Disaple debug output so the code will respond faster
  libsoc_set_debug(0);

  sleep(10);
  
  libsoc_set_debug(1);
 
  // Cancel the callback on interrupt
  libsoc_gpio_callback_interrupt_cancel(gpio_input);
  
  //If gpio_request was successful
  if (gpio_input) { // Free gpio request memory
    libsoc_gpio_free(gpio_input);
  }
  
  if (gpio_output) { // Free gpio request memory
    libsoc_gpio_free(gpio_output);
  }
  
  return EXIT_SUCCESS;
}