apds9306.cpp

Go to the documentation of this file.

// Based on this datasheet:
// https://www.mouser.ca/datasheet/2/678/AVGO_S_A0002854364_1-2574547.pdf
 
#include "apds9306.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
 
namespace esphome::apds9306 {
 
ESPHOME_LOG_TAG(TAG, "apds9306");
 
enum {  // APDS9306 registers
  APDS9306_MAIN_CTRL = 0x00,
  APDS9306_ALS_MEAS_RATE = 0x04,
  APDS9306_ALS_GAIN = 0x05,
  APDS9306_PART_ID = 0x06,
  APDS9306_MAIN_STATUS = 0x07,
  APDS9306_CLEAR_DATA_0 = 0x0A,  // LSB
  APDS9306_CLEAR_DATA_1 = 0x0B,
  APDS9306_CLEAR_DATA_2 = 0x0C,  // MSB
  APDS9306_ALS_DATA_0 = 0x0D,    // LSB
  APDS9306_ALS_DATA_1 = 0x0E,
  APDS9306_ALS_DATA_2 = 0x0F,  // MSB
  APDS9306_INT_CFG = 0x19,
  APDS9306_INT_PERSISTENCE = 0x1A,
  APDS9306_ALS_THRES_UP_0 = 0x21,  // LSB
  APDS9306_ALS_THRES_UP_1 = 0x22,
  APDS9306_ALS_THRES_UP_2 = 0x23,   // MSB
  APDS9306_ALS_THRES_LOW_0 = 0x24,  // LSB
  APDS9306_ALS_THRES_LOW_1 = 0x25,
  APDS9306_ALS_THRES_LOW_2 = 0x26,  // MSB
  APDS9306_ALS_THRES_VAR = 0x27
};
 
#define APDS9306_ERROR_CHECK(func, error) \
  if (!(func)) { \
    this->mark_failed(LOG_STR(error)); \
    return; \
  }
#define APDS9306_WARNING_CHECK(func, warning) \
  if (!(func)) { \
    ESP_LOGW(TAG, warning); \
    this->status_set_warning(); \
    return; \
  }
#define APDS9306_WRITE_BYTE(reg, value) \
  ESP_LOGV(TAG, "Writing 0x%02x to 0x%02x", value, reg); \
  if (!this->write_byte(reg, value)) { \
    ESP_LOGE(TAG, "Failed writing 0x%02x to 0x%02x", value, reg); \
    this->mark_failed(LOG_STR(ESP_LOG_MSG_COMM_FAIL)); \
    return; \
  }
 
void APDS9306::setup() {
  // 0xB1 for APDS9306, 0xB3 for APDS9306-065; they differ only in bit 1
  if (!this->check_chip_id(this, APDS9306_PART_ID, 0xB1, 0xFD))
    return;
 
  // ALS resolution and measurement, see datasheet or init.py for options
  uint8_t als_meas_rate = ((this->bit_width_ & 0x07) << 4) | (this->measurement_rate_ & 0x07);
  APDS9306_WRITE_BYTE(APDS9306_ALS_MEAS_RATE, als_meas_rate);
 
  // ALS gain, see datasheet or init.py for options
  uint8_t als_gain = (this->gain_ & 0x07);
  APDS9306_WRITE_BYTE(APDS9306_ALS_GAIN, als_gain);
 
  // Set to standby mode
  APDS9306_WRITE_BYTE(APDS9306_MAIN_CTRL, 0x00);
 
  // Check for data, clear main status
  uint8_t status;
  APDS9306_WARNING_CHECK(this->read_byte(APDS9306_MAIN_STATUS, &status), "Reading MAIN STATUS failed.");
 
  // Set to active mode
  APDS9306_WRITE_BYTE(APDS9306_MAIN_CTRL, 0x02);
}
 
void APDS9306::dump_config() {
  LOG_SENSOR("", "APDS9306", this);
  LOG_I2C_DEVICE(this);
 
  ESP_LOGCONFIG(TAG,
                "  Gain: %u\n"
                "  Measurement rate: %u\n"
                "  Measurement Resolution/Bit width: %d",
                AMBIENT_LIGHT_GAIN_VALUES[this->gain_], MEASUREMENT_RATE_VALUES[this->measurement_rate_],
                MEASUREMENT_BIT_WIDTH_VALUES[this->bit_width_]);
 
  LOG_UPDATE_INTERVAL(this);
}
 
void APDS9306::update() {
  // Check for new data
  uint8_t status;
  APDS9306_WARNING_CHECK(this->read_byte(APDS9306_MAIN_STATUS, &status), "Reading MAIN STATUS failed.");
 
  this->status_clear_warning();
 
  status &= 0b00001000;
  if (!status) {  // No new data
    return;
  }
 
  // Set to standby mode
  APDS9306_WRITE_BYTE(APDS9306_MAIN_CTRL, 0x00);
 
  // Clear MAIN STATUS
  APDS9306_WARNING_CHECK(this->read_byte(APDS9306_MAIN_STATUS, &status), "Reading MAIN STATUS failed.");
 
  uint8_t als_data[3];
  APDS9306_WARNING_CHECK(this->read_bytes(APDS9306_ALS_DATA_0, als_data, 3), "Reading ALS data has failed.");
 
  // Set to active mode
  APDS9306_WRITE_BYTE(APDS9306_MAIN_CTRL, 0x02);
 
  uint32_t light_level = 0x00 | encode_uint24(als_data[2], als_data[1], als_data[0]);
 
  float lux = ((float) light_level / AMBIENT_LIGHT_GAIN_VALUES[this->gain_]) *
              (100.0f / MEASUREMENT_RATE_VALUES[this->measurement_rate_]);
 
  ESP_LOGD(TAG, "Got illuminance=%.1flx from", lux);
  this->publish_state(lux);
}
 
}  // namespace esphome::apds9306