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https://github.com/esphome/esphome.git
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d2c7afeef0
* Add PZEM004T Support * Don't flush as much * Update pzem004t.cpp * Add generalized modbus * Add PZEMAC * Add PZEMDC * Fix file modes * Lint * Fix * Fix * Add check_uart_settings
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
#include "senseair.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace senseair {
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static const char *TAG = "senseair";
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static const uint8_t SENSEAIR_REQUEST_LENGTH = 8;
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static const uint8_t SENSEAIR_RESPONSE_LENGTH = 13;
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static const uint8_t SENSEAIR_COMMAND_GET_PPM[] = {0xFE, 0x04, 0x00, 0x00, 0x00, 0x04, 0xE5, 0xC6};
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void SenseAirComponent::update() {
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uint8_t response[SENSEAIR_RESPONSE_LENGTH];
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if (!this->senseair_write_command_(SENSEAIR_COMMAND_GET_PPM, response)) {
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ESP_LOGW(TAG, "Reading data from SenseAir 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] != 0xFE || response[1] != 0x04) {
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ESP_LOGW(TAG, "Invalid preamble from SenseAir!");
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this->status_set_warning();
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return;
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}
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uint16_t calc_checksum = this->senseair_checksum_(response, 11);
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uint16_t resp_checksum = (uint16_t(response[12]) << 8) | response[11];
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if (resp_checksum != calc_checksum) {
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ESP_LOGW(TAG, "SenseAir checksum doesn't match: 0x%02X!=0x%02X", resp_checksum, calc_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 uint8_t length = response[2];
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const uint16_t status = (uint16_t(response[3]) << 8) | response[4];
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const uint16_t ppm = (uint16_t(response[length + 1]) << 8) | response[length + 2];
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ESP_LOGD(TAG, "SenseAir Received CO₂=%uppm Status=0x%02X", ppm, status);
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if (this->co2_sensor_ != nullptr)
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this->co2_sensor_->publish_state(ppm);
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}
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uint16_t SenseAirComponent::senseair_checksum_(uint8_t *ptr, uint8_t length) {
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uint16_t crc = 0xFFFF;
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uint8_t i;
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while (length--) {
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crc ^= *ptr++;
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for (i = 0; i < 8; i++) {
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if ((crc & 0x01) != 0) {
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crc >>= 1;
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crc ^= 0xA001;
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} else {
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crc >>= 1;
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}
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}
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}
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return crc;
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}
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bool SenseAirComponent::senseair_write_command_(const uint8_t *command, uint8_t *response) {
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this->flush();
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this->write_array(command, SENSEAIR_REQUEST_LENGTH);
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if (response == nullptr)
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return true;
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bool ret = this->read_array(response, SENSEAIR_RESPONSE_LENGTH);
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this->flush();
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return ret;
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}
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void SenseAirComponent::dump_config() {
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ESP_LOGCONFIG(TAG, "SenseAir:");
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LOG_SENSOR(" ", "CO2", this->co2_sensor_);
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this->check_uart_settings(9600);
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}
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} // namespace senseair
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} // namespace esphome
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