duty_cycle_sensor.cpp

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#include "duty_cycle_sensor.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
 
namespace esphome {
namespace duty_cycle {
 
static const char *const TAG = "duty_cycle";
 
void DutyCycleSensor::setup() {
  this->pin_->setup();
  this->store_.pin = this->pin_->to_isr();
  this->store_.last_level = this->pin_->digital_read();
  this->store_.last_interrupt = micros();
 
  this->pin_->attach_interrupt(DutyCycleSensorStore::gpio_intr, &this->store_, gpio::INTERRUPT_ANY_EDGE);
}
void DutyCycleSensor::dump_config() {
  LOG_SENSOR("", "Duty Cycle Sensor", this);
  LOG_PIN("  Pin: ", this->pin_);
  LOG_UPDATE_INTERVAL(this);
}
void DutyCycleSensor::update() {
  const uint32_t now = micros();
  const uint32_t last_interrupt = this->store_.last_interrupt;  // Read the measurement taken by the interrupt
  uint32_t on_time = this->store_.on_time;
 
  this->store_.on_time = 0;  // Start new measurement, exactly aligned with the micros() reading
  this->store_.last_interrupt = now;
 
  if (this->last_update_ != 0) {
    const bool level = this->store_.last_level;
 
    if (level)
      on_time += now - last_interrupt;
 
    const float total_time = float(now - this->last_update_);
 
    const float value = (on_time * 100.0f) / total_time;
    ESP_LOGD(TAG, "'%s' Got duty cycle=%.1f%%", this->get_name().c_str(), value);
    this->publish_state(value);
  }
  this->last_update_ = now;
}
 
float DutyCycleSensor::get_setup_priority() const { return setup_priority::DATA; }
 
void IRAM_ATTR DutyCycleSensorStore::gpio_intr(DutyCycleSensorStore *arg) {
  const bool new_level = arg->pin.digital_read();
  if (new_level == arg->last_level)
    return;
  arg->last_level = new_level;
  const uint32_t now = micros();
 
  if (!new_level)
    arg->on_time += now - arg->last_interrupt;
 
  arg->last_interrupt = now;
}
 
}  // namespace duty_cycle
}  // namespace esphome