hdc1080.cpp

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#include "hdc1080.h"
#include "esphome/core/log.h"
#include "esphome/core/hal.h"
 
namespace esphome::hdc1080 {
 
ESPHOME_LOG_TAG(TAG, "hdc1080");
 
static const uint8_t HDC1080_CMD_CONFIGURATION = 0x02;
static const uint8_t HDC1080_CMD_TEMPERATURE = 0x00;
static const uint8_t HDC1080_CMD_HUMIDITY = 0x01;
 
void HDC1080Component::setup() {
  const uint8_t config[2] = {0x00, 0x00};  // resolution 14bit for both humidity and temperature
 
  // if configuration fails - there is a problem
  if (this->write_register(HDC1080_CMD_CONFIGURATION, config, 2) != i2c::ERROR_OK) {
    ESP_LOGW(TAG, "Failed to configure HDC1080");
    this->status_set_warning();
    return;
  }
}
 
void HDC1080Component::dump_config() {
  ESP_LOGCONFIG(TAG, "HDC1080:");
  LOG_I2C_DEVICE(this);
  LOG_UPDATE_INTERVAL(this);
  LOG_SENSOR("  ", "Temperature", this->temperature_);
  LOG_SENSOR("  ", "Humidity", this->humidity_);
}
 
void HDC1080Component::update() {
  // regardless of what sensor/s are defined in yaml configuration
  // the hdc1080 setup configuration used, requires both temperature and humidity to be read
 
  this->status_clear_warning();
 
  if (this->write(&HDC1080_CMD_TEMPERATURE, 1) != i2c::ERROR_OK) {
    this->status_set_warning();
    return;
  }
 
  this->set_timeout(20, [this]() {
    uint16_t raw_temperature;
    if (this->read(reinterpret_cast<uint8_t *>(&raw_temperature), 2) != i2c::ERROR_OK) {
      this->status_set_warning();
      return;
    }
 
    if (this->temperature_ != nullptr) {
      raw_temperature = i2c::i2ctohs(raw_temperature);
      float temperature = raw_temperature * 0.0025177f - 40.0f;  // raw * 2^-16 * 165 - 40
      this->temperature_->publish_state(temperature);
    }
 
    if (this->write(&HDC1080_CMD_HUMIDITY, 1) != i2c::ERROR_OK) {
      this->status_set_warning();
      return;
    }
 
    this->set_timeout(20, [this]() {
      uint16_t raw_humidity;
      if (this->read(reinterpret_cast<uint8_t *>(&raw_humidity), 2) != i2c::ERROR_OK) {
        this->status_set_warning();
        return;
      }
 
      if (this->humidity_ != nullptr) {
        raw_humidity = i2c::i2ctohs(raw_humidity);
        float humidity = raw_humidity * 0.001525879f;  // raw * 2^-16 * 100
        this->humidity_->publish_state(humidity);
      }
    });
  });
}
 
}  // namespace esphome::hdc1080