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93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
// Implementation based on:
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// - ESPEasy: https://github.com/letscontrolit/ESPEasy/blob/mega/src/_P034_DHT12.ino
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// - DHT12_sensor_library: https://github.com/xreef/DHT12_sensor_library/blob/master/DHT12.cpp
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// - Arduino - AM2320: https://github.com/EngDial/AM2320/blob/master/src/AM2320.cpp
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#include "am2320.h"
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#include "esphome/core/hal.h"
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#include "esphome/core/helpers.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace am2320 {
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static const char *const TAG = "am2320";
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void AM2320Component::update() {
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uint8_t data[8];
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data[0] = 0;
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data[1] = 4;
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if (!this->read_data_(data)) {
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this->status_set_warning();
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return;
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}
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float temperature = (((data[4] & 0x7F) << 8) + data[5]) / 10.0f;
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temperature = (data[4] & 0x80) ? -temperature : temperature;
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float humidity = ((data[2] << 8) + data[3]) / 10.0f;
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ESP_LOGD(TAG, "Got temperature=%.1f°C humidity=%.1f%%", temperature, humidity);
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if (this->temperature_sensor_ != nullptr)
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this->temperature_sensor_->publish_state(temperature);
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if (this->humidity_sensor_ != nullptr)
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this->humidity_sensor_->publish_state(humidity);
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this->status_clear_warning();
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}
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void AM2320Component::setup() {
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ESP_LOGCONFIG(TAG, "Setting up AM2320...");
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uint8_t data[8];
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data[0] = 0;
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data[1] = 4;
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if (!this->read_data_(data)) {
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this->mark_failed();
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return;
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}
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}
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void AM2320Component::dump_config() {
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ESP_LOGD(TAG, "AM2320:");
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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 AM2320 failed!");
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}
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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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float AM2320Component::get_setup_priority() const { return setup_priority::DATA; }
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bool AM2320Component::read_bytes_(uint8_t a_register, uint8_t *data, uint8_t len, uint32_t conversion) {
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if (!this->write_bytes(a_register, data, 2)) {
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ESP_LOGW(TAG, "Writing bytes for AM2320 failed!");
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return false;
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}
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if (conversion > 0)
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delay(conversion);
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return this->read(data, len) == i2c::ERROR_OK;
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}
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bool AM2320Component::read_data_(uint8_t *data) {
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// Wake up
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this->write_bytes(0, data, 0);
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// Write instruction 3, 2 bytes, get 8 bytes back (2 preamble, 2 bytes temperature, 2 bytes humidity, 2 bytes CRC)
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if (!this->read_bytes_(3, data, 8, 2)) {
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ESP_LOGW(TAG, "Updating AM2320 failed!");
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return false;
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}
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uint16_t checksum;
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checksum = data[7] << 8;
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checksum += data[6];
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if (crc16(data, 6) != checksum) {
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ESP_LOGW(TAG, "AM2320 Checksum invalid!");
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return false;
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}
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return true;
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}
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} // namespace am2320
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} // namespace esphome
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