button.cpp

#include "button.h"
#include "pico/stdlib.h"

#include <cstdio>

button :: button(uint8_t gpio_num):gpio_num(gpio_num)
{
    button_state = up;
    time_pressed = 0;
    gpio_init(gpio_num);
    gpio_set_dir(gpio_num, GPIO_IN);
    gpio_pull_up(gpio_num);
}

void button :: update_state()
{
  if(button_state == up)
  {
    if(!gpio_get(gpio_num)) //on
    {
      time_pressed = time_us_32();
      button_state = down;
    }
  }
  else if(button_state == down)
  {
    if((time_us_32() - time_pressed) > (500 * 1000))
    {
      button_state = held;
    }
    else if(gpio_get(gpio_num)) //off
    {
      if((time_us_32() - time_pressed) > (50 * 1000))
      {
        button_state = pressed;
      }
      else
      {
        button_state = up;
      }
    }
  }
  else if(button_state == pressed)
  {
    button_state = up;
  }
  else if(button_state == held)
  {
    if(gpio_get(gpio_num)) //off
    {
      button_state = up;
    }
  }
}

bool button :: is_pressed()
{
  update_state();
  return button_state == pressed;
}

bool button :: is_held()
{
  update_state();
  return button_state == held;
}