mirror of
https://github.com/esphome/esphome.git
synced 2024-12-02 19:54:14 +01:00
294 lines
9.5 KiB
C++
294 lines
9.5 KiB
C++
#include "scd4x.h"
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#include "esphome/core/hal.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace scd4x {
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static const char *const TAG = "scd4x";
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static const uint16_t SCD4X_CMD_GET_SERIAL_NUMBER = 0x3682;
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static const uint16_t SCD4X_CMD_TEMPERATURE_OFFSET = 0x241d;
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static const uint16_t SCD4X_CMD_ALTITUDE_COMPENSATION = 0x2427;
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static const uint16_t SCD4X_CMD_AMBIENT_PRESSURE_COMPENSATION = 0xe000;
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static const uint16_t SCD4X_CMD_AUTOMATIC_SELF_CALIBRATION = 0x2416;
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static const uint16_t SCD4X_CMD_START_CONTINUOUS_MEASUREMENTS = 0x21b1;
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static const uint16_t SCD4X_CMD_GET_DATA_READY_STATUS = 0xe4b8;
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static const uint16_t SCD4X_CMD_READ_MEASUREMENT = 0xec05;
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static const uint16_t SCD4X_CMD_PERFORM_FORCED_CALIBRATION = 0x362f;
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static const uint16_t SCD4X_CMD_STOP_MEASUREMENTS = 0x3f86;
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static const float SCD4X_TEMPERATURE_OFFSET_MULTIPLIER = (1 << 16) / 175.0f;
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void SCD4XComponent::setup() {
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ESP_LOGCONFIG(TAG, "Setting up scd4x...");
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// the sensor needs 1000 ms to enter the idle state
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this->set_timeout(1000, [this]() {
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// Check if measurement is ready before reading the value
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if (!this->write_command_(SCD4X_CMD_GET_DATA_READY_STATUS)) {
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ESP_LOGE(TAG, "Failed to write data ready status command");
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this->mark_failed();
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return;
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}
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uint16_t raw_read_status[1];
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if (!this->read_data_(raw_read_status, 1)) {
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ESP_LOGE(TAG, "Failed to read data ready status");
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this->mark_failed();
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return;
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}
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uint32_t stop_measurement_delay = 0;
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// In order to query the device periodic measurement must be ceased
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if (raw_read_status[0]) {
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ESP_LOGD(TAG, "Sensor has data available, stopping periodic measurement");
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if (!this->write_command_(SCD4X_CMD_STOP_MEASUREMENTS)) {
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ESP_LOGE(TAG, "Failed to stop measurements");
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this->mark_failed();
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return;
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}
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// According to the SCD4x datasheet the sensor will only respond to other commands after waiting 500 ms after
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// issuing the stop_periodic_measurement command
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stop_measurement_delay = 500;
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}
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this->set_timeout(stop_measurement_delay, [this]() {
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if (!this->write_command_(SCD4X_CMD_GET_SERIAL_NUMBER)) {
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ESP_LOGE(TAG, "Failed to write get serial command");
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this->error_code_ = COMMUNICATION_FAILED;
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this->mark_failed();
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return;
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}
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uint16_t raw_serial_number[3];
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if (!this->read_data_(raw_serial_number, 3)) {
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ESP_LOGE(TAG, "Failed to read serial number");
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this->error_code_ = SERIAL_NUMBER_IDENTIFICATION_FAILED;
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this->mark_failed();
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return;
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}
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ESP_LOGD(TAG, "Serial number %02d.%02d.%02d", (uint16_t(raw_serial_number[0]) >> 8),
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uint16_t(raw_serial_number[0] & 0xFF), (uint16_t(raw_serial_number[1]) >> 8));
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if (!this->write_command_(SCD4X_CMD_TEMPERATURE_OFFSET,
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(uint16_t)(temperature_offset_ * SCD4X_TEMPERATURE_OFFSET_MULTIPLIER))) {
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ESP_LOGE(TAG, "Error setting temperature offset.");
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this->error_code_ = MEASUREMENT_INIT_FAILED;
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this->mark_failed();
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return;
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}
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// If pressure compensation available use it
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// else use altitude
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if (ambient_pressure_compensation_) {
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if (!this->update_ambient_pressure_compensation_(ambient_pressure_)) {
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ESP_LOGE(TAG, "Error setting ambient pressure compensation.");
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this->error_code_ = MEASUREMENT_INIT_FAILED;
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this->mark_failed();
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return;
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}
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} else {
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if (!this->write_command_(SCD4X_CMD_ALTITUDE_COMPENSATION, altitude_compensation_)) {
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ESP_LOGE(TAG, "Error setting altitude compensation.");
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this->error_code_ = MEASUREMENT_INIT_FAILED;
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this->mark_failed();
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return;
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}
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}
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if (!this->write_command_(SCD4X_CMD_AUTOMATIC_SELF_CALIBRATION, enable_asc_ ? 1 : 0)) {
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ESP_LOGE(TAG, "Error setting automatic self calibration.");
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this->error_code_ = MEASUREMENT_INIT_FAILED;
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this->mark_failed();
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return;
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}
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// Finally start sensor measurements
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if (!this->write_command_(SCD4X_CMD_START_CONTINUOUS_MEASUREMENTS)) {
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ESP_LOGE(TAG, "Error starting continuous measurements.");
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this->error_code_ = MEASUREMENT_INIT_FAILED;
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this->mark_failed();
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return;
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}
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initialized_ = true;
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ESP_LOGD(TAG, "Sensor initialized");
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});
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});
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}
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void SCD4XComponent::dump_config() {
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ESP_LOGCONFIG(TAG, "scd4x:");
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LOG_I2C_DEVICE(this);
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if (this->is_failed()) {
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switch (this->error_code_) {
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case COMMUNICATION_FAILED:
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ESP_LOGW(TAG, "Communication failed! Is the sensor connected?");
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break;
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case MEASUREMENT_INIT_FAILED:
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ESP_LOGW(TAG, "Measurement Initialization failed!");
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break;
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case SERIAL_NUMBER_IDENTIFICATION_FAILED:
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ESP_LOGW(TAG, "Unable to read sensor firmware version");
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break;
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default:
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ESP_LOGW(TAG, "Unknown setup error!");
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break;
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}
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}
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ESP_LOGCONFIG(TAG, " Automatic self calibration: %s", ONOFF(this->enable_asc_));
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if (this->ambient_pressure_compensation_) {
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ESP_LOGCONFIG(TAG, " Altitude compensation disabled");
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ESP_LOGCONFIG(TAG, " Ambient pressure compensation: %dmBar", this->ambient_pressure_);
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} else {
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ESP_LOGCONFIG(TAG, " Ambient pressure compensation disabled");
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ESP_LOGCONFIG(TAG, " Altitude compensation: %dm", this->altitude_compensation_);
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}
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ESP_LOGCONFIG(TAG, " Temperature offset: %.2f °C", this->temperature_offset_);
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LOG_UPDATE_INTERVAL(this);
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LOG_SENSOR(" ", "CO2", this->co2_sensor_);
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LOG_SENSOR(" ", "Temperature", this->temperature_sensor_);
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LOG_SENSOR(" ", "Humidity", this->humidity_sensor_);
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}
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void SCD4XComponent::update() {
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if (!initialized_) {
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return;
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}
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if (this->ambient_pressure_source_ != nullptr) {
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float pressure = this->ambient_pressure_source_->state / 1000.0f;
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if (!std::isnan(pressure)) {
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set_ambient_pressure_compensation(this->ambient_pressure_source_->state / 1000.0f);
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}
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}
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// Check if data is ready
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if (!this->write_command_(SCD4X_CMD_GET_DATA_READY_STATUS)) {
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this->status_set_warning();
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return;
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}
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uint16_t raw_read_status[1];
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if (!this->read_data_(raw_read_status, 1) || raw_read_status[0] == 0x00) {
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this->status_set_warning();
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ESP_LOGW(TAG, "Data not ready yet!");
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return;
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}
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if (!this->write_command_(SCD4X_CMD_READ_MEASUREMENT)) {
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ESP_LOGW(TAG, "Error reading measurement!");
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this->status_set_warning();
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return;
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}
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// Read off sensor data
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uint16_t raw_data[3];
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if (!this->read_data_(raw_data, 3)) {
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this->status_set_warning();
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return;
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}
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if (this->co2_sensor_ != nullptr)
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this->co2_sensor_->publish_state(raw_data[0]);
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if (this->temperature_sensor_ != nullptr) {
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const float temperature = -45.0f + (175.0f * (raw_data[1])) / (1 << 16);
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this->temperature_sensor_->publish_state(temperature);
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}
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if (this->humidity_sensor_ != nullptr) {
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const float humidity = (100.0f * raw_data[2]) / (1 << 16);
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this->humidity_sensor_->publish_state(humidity);
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}
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this->status_clear_warning();
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}
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// Note pressure in bar here. Convert to hPa
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void SCD4XComponent::set_ambient_pressure_compensation(float pressure_in_bar) {
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ambient_pressure_compensation_ = true;
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uint16_t new_ambient_pressure = (uint16_t)(pressure_in_bar * 1000);
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// remove millibar from comparison to avoid frequent updates +/- 10 millibar doesn't matter
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if (initialized_ && (new_ambient_pressure / 10 != ambient_pressure_ / 10)) {
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update_ambient_pressure_compensation_(new_ambient_pressure);
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ambient_pressure_ = new_ambient_pressure;
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} else {
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ESP_LOGD(TAG, "ambient pressure compensation skipped - no change required");
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}
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}
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bool SCD4XComponent::update_ambient_pressure_compensation_(uint16_t pressure_in_hpa) {
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if (this->write_command_(SCD4X_CMD_AMBIENT_PRESSURE_COMPENSATION, pressure_in_hpa)) {
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ESP_LOGD(TAG, "setting ambient pressure compensation to %d hPa", pressure_in_hpa);
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return true;
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} else {
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ESP_LOGE(TAG, "Error setting ambient pressure compensation.");
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return false;
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}
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}
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uint8_t SCD4XComponent::sht_crc_(uint8_t data1, uint8_t data2) {
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uint8_t bit;
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uint8_t crc = 0xFF;
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crc ^= data1;
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for (bit = 8; bit > 0; --bit) {
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if (crc & 0x80)
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crc = (crc << 1) ^ 0x131;
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else
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crc = (crc << 1);
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}
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crc ^= data2;
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for (bit = 8; bit > 0; --bit) {
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if (crc & 0x80)
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crc = (crc << 1) ^ 0x131;
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else
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crc = (crc << 1);
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}
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return crc;
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}
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bool SCD4XComponent::read_data_(uint16_t *data, uint8_t len) {
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const uint8_t num_bytes = len * 3;
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std::vector<uint8_t> buf(num_bytes);
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if (this->read(buf.data(), num_bytes) != i2c::ERROR_OK) {
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return false;
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}
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for (uint8_t i = 0; i < len; i++) {
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const uint8_t j = 3 * i;
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uint8_t crc = sht_crc_(buf[j], buf[j + 1]);
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if (crc != buf[j + 2]) {
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ESP_LOGE(TAG, "CRC8 Checksum invalid! 0x%02X != 0x%02X", buf[j + 2], crc);
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return false;
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}
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data[i] = (buf[j] << 8) | buf[j + 1];
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}
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return true;
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}
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bool SCD4XComponent::write_command_(uint16_t command) {
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const uint8_t num_bytes = 2;
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uint8_t buffer[num_bytes];
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buffer[0] = (command >> 8);
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buffer[1] = command & 0xff;
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return this->write(buffer, num_bytes) == i2c::ERROR_OK;
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}
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bool SCD4XComponent::write_command_(uint16_t command, uint16_t data) {
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uint8_t raw[5];
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raw[0] = command >> 8;
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raw[1] = command & 0xFF;
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raw[2] = data >> 8;
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raw[3] = data & 0xFF;
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raw[4] = sht_crc_(raw[2], raw[3]);
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return this->write(raw, 5) == i2c::ERROR_OK;
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}
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} // namespace scd4x
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} // namespace esphome
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