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57ff465d39
per spec request and response are of the same length, simplify code by using the same length buffers. It should help later when more code that uses buffers are added. Signed-off-by: Igor Mammedov <imammedo@redhat.com>
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
#include "mhz19.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mhz19 {
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static const char *TAG = "mhz19";
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static const uint8_t MHZ19_PDU_LENGTH = 9;
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static const uint8_t MHZ19_COMMAND_GET_PPM[] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79};
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uint8_t mhz19_checksum(const uint8_t *command) {
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uint8_t sum = 0;
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for (uint8_t i = 1; i < MHZ19_PDU_LENGTH - 1; i++) {
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sum += command[i];
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}
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return 0xFF - sum + 0x01;
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}
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void MHZ19Component::update() {
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uint8_t response[MHZ19_PDU_LENGTH];
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if (!this->mhz19_write_command_(MHZ19_COMMAND_GET_PPM, response)) {
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ESP_LOGW(TAG, "Reading data from MHZ19 failed!");
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this->status_set_warning();
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return;
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}
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if (response[0] != 0xFF || response[1] != 0x86) {
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ESP_LOGW(TAG, "Invalid preamble from MHZ19!");
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this->status_set_warning();
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return;
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}
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uint8_t checksum = mhz19_checksum(response);
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if (response[8] != checksum) {
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ESP_LOGW(TAG, "MHZ19 Checksum doesn't match: 0x%02X!=0x%02X", response[8], checksum);
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this->status_set_warning();
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return;
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}
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this->status_clear_warning();
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const uint16_t ppm = (uint16_t(response[2]) << 8) | response[3];
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const int temp = int(response[4]) - 40;
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const uint8_t status = response[5];
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ESP_LOGD(TAG, "MHZ19 Received CO₂=%uppm Temperature=%d°C Status=0x%02X", ppm, temp, status);
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if (this->co2_sensor_ != nullptr)
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this->co2_sensor_->publish_state(ppm);
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if (this->temperature_sensor_ != nullptr)
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this->temperature_sensor_->publish_state(temp);
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}
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bool MHZ19Component::mhz19_write_command_(const uint8_t *command, uint8_t *response) {
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this->write_array(command, MHZ19_PDU_LENGTH);
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this->flush();
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if (response == nullptr)
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return true;
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bool ret = this->read_array(response, MHZ19_PDU_LENGTH);
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return ret;
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}
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float MHZ19Component::get_setup_priority() const { return setup_priority::DATA; }
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void MHZ19Component::dump_config() {
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ESP_LOGCONFIG(TAG, "MH-Z19:");
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LOG_SENSOR(" ", "CO2", this->co2_sensor_);
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LOG_SENSOR(" ", "Temperature", this->temperature_sensor_);
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}
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} // namespace mhz19
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} // namespace esphome
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