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https://github.com/esphome/esphome.git
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ee21a91313
Co-authored-by: Greg Arnold <greg@arnoldassociates.com> Co-authored-by: notsonominal <130870838+notsonominal@users.noreply.github.com>
122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
#include "mlx90614.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 mlx90614 {
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static const uint8_t MLX90614_RAW_IR_1 = 0x04;
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static const uint8_t MLX90614_RAW_IR_2 = 0x05;
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static const uint8_t MLX90614_TEMPERATURE_AMBIENT = 0x06;
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static const uint8_t MLX90614_TEMPERATURE_OBJECT_1 = 0x07;
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static const uint8_t MLX90614_TEMPERATURE_OBJECT_2 = 0x08;
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static const uint8_t MLX90614_TOMAX = 0x20;
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static const uint8_t MLX90614_TOMIN = 0x21;
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static const uint8_t MLX90614_PWMCTRL = 0x22;
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static const uint8_t MLX90614_TARANGE = 0x23;
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static const uint8_t MLX90614_EMISSIVITY = 0x24;
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static const uint8_t MLX90614_CONFIG = 0x25;
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static const uint8_t MLX90614_ADDR = 0x2E;
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static const uint8_t MLX90614_ID1 = 0x3C;
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static const uint8_t MLX90614_ID2 = 0x3D;
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static const uint8_t MLX90614_ID3 = 0x3E;
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static const uint8_t MLX90614_ID4 = 0x3F;
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static const char *const TAG = "mlx90614";
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void MLX90614Component::setup() {
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ESP_LOGCONFIG(TAG, "Setting up MLX90614...");
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if (!this->write_emissivity_()) {
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ESP_LOGE(TAG, "Communication with MLX90614 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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bool MLX90614Component::write_emissivity_() {
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if (std::isnan(this->emissivity_))
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return true;
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uint16_t value = (uint16_t) (this->emissivity_ * 65535);
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if (!this->write_bytes_(MLX90614_EMISSIVITY, 0)) {
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return false;
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}
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delay(10);
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if (!this->write_bytes_(MLX90614_EMISSIVITY, value)) {
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return false;
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}
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delay(10);
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return true;
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}
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uint8_t MLX90614Component::crc8_pec_(const uint8_t *data, uint8_t len) {
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uint8_t crc = 0;
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for (uint8_t i = 0; i < len; i++) {
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uint8_t in = data[i];
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for (uint8_t j = 0; j < 8; j++) {
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bool carry = (crc ^ in) & 0x80;
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crc <<= 1;
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if (carry)
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crc ^= 0x07;
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in <<= 1;
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}
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}
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return crc;
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}
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bool MLX90614Component::write_bytes_(uint8_t reg, uint16_t data) {
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uint8_t buf[5];
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buf[0] = this->address_ << 1;
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buf[1] = reg;
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buf[2] = data & 0xFF;
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buf[3] = data >> 8;
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buf[4] = this->crc8_pec_(buf, 4);
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return this->write_bytes(reg, buf + 2, 3);
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}
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void MLX90614Component::dump_config() {
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ESP_LOGCONFIG(TAG, "MLX90614:");
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LOG_I2C_DEVICE(this);
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if (this->is_failed()) {
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ESP_LOGE(TAG, "Communication with MLX90614 failed!");
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}
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LOG_UPDATE_INTERVAL(this);
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LOG_SENSOR(" ", "Ambient", this->ambient_sensor_);
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LOG_SENSOR(" ", "Object", this->object_sensor_);
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}
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float MLX90614Component::get_setup_priority() const { return setup_priority::DATA; }
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void MLX90614Component::update() {
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uint8_t emissivity[3];
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if (this->read_register(MLX90614_EMISSIVITY, emissivity, 3, false) != i2c::ERROR_OK) {
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this->status_set_warning();
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return;
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}
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uint8_t raw_object[3];
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if (this->read_register(MLX90614_TEMPERATURE_OBJECT_1, raw_object, 3, false) != i2c::ERROR_OK) {
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this->status_set_warning();
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return;
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}
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uint8_t raw_ambient[3];
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if (this->read_register(MLX90614_TEMPERATURE_AMBIENT, raw_ambient, 3, false) != i2c::ERROR_OK) {
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this->status_set_warning();
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return;
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}
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float ambient = raw_ambient[1] & 0x80 ? NAN : encode_uint16(raw_ambient[1], raw_ambient[0]) * 0.02f - 273.15f;
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float object = raw_object[1] & 0x80 ? NAN : encode_uint16(raw_object[1], raw_object[0]) * 0.02f - 273.15f;
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ESP_LOGD(TAG, "Got Temperature=%.1f°C Ambient=%.1f°C", object, ambient);
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if (this->ambient_sensor_ != nullptr && !std::isnan(ambient))
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this->ambient_sensor_->publish_state(ambient);
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if (this->object_sensor_ != nullptr && !std::isnan(object))
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this->object_sensor_->publish_state(object);
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this->status_clear_warning();
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}
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} // namespace mlx90614
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} // namespace esphome
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