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112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
#include "cm1106.h"
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#include "esphome/core/log.h"
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#include <cinttypes>
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namespace esphome {
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namespace cm1106 {
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static const char *const TAG = "cm1106";
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static const uint8_t C_M1106_CMD_GET_CO2[4] = {0x11, 0x01, 0x01, 0xED};
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static const uint8_t C_M1106_CMD_SET_CO2_CALIB[6] = {0x11, 0x03, 0x03, 0x00, 0x00, 0x00};
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static const uint8_t C_M1106_CMD_SET_CO2_CALIB_RESPONSE[4] = {0x16, 0x01, 0x03, 0xE6};
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uint8_t cm1106_checksum(const uint8_t *response, size_t len) {
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uint8_t crc = 0;
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for (int i = 0; i < len - 1; i++) {
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crc -= response[i];
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}
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return crc;
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}
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void CM1106Component::setup() {
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uint8_t response[8] = {0};
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if (!this->cm1106_write_command_(C_M1106_CMD_GET_CO2, sizeof(C_M1106_CMD_GET_CO2), response, sizeof(response))) {
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ESP_LOGE(TAG, ESP_LOG_MSG_COMM_FAIL);
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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 CM1106Component::update() {
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uint8_t response[8] = {0};
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if (!this->cm1106_write_command_(C_M1106_CMD_GET_CO2, sizeof(C_M1106_CMD_GET_CO2), response, sizeof(response))) {
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ESP_LOGW(TAG, "Reading data from CM1106 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] != 0x16 || response[1] != 0x05 || response[2] != 0x01) {
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ESP_LOGW(TAG, "Got wrong UART response from CM1106: %02X %02X %02X %02X", response[0], response[1], response[2],
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response[3]);
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this->status_set_warning();
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return;
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}
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uint8_t checksum = cm1106_checksum(response, sizeof(response));
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if (response[7] != checksum) {
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ESP_LOGW(TAG, "CM1106 Checksum doesn't match: 0x%02X!=0x%02X", response[7], 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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uint16_t ppm = response[3] << 8 | response[4];
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ESP_LOGD(TAG, "CM1106 Received CO₂=%uppm DF3=%02X DF4=%02X", ppm, response[5], response[6]);
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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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void CM1106Component::calibrate_zero(uint16_t ppm) {
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uint8_t cmd[6];
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memcpy(cmd, C_M1106_CMD_SET_CO2_CALIB, sizeof(cmd));
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cmd[3] = ppm >> 8;
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cmd[4] = ppm & 0xFF;
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uint8_t response[4] = {0};
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if (!this->cm1106_write_command_(cmd, sizeof(cmd), response, sizeof(response))) {
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ESP_LOGW(TAG, "Reading data from CM1106 failed!");
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this->status_set_warning();
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return;
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}
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// check if correct response received
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if (memcmp(response, C_M1106_CMD_SET_CO2_CALIB_RESPONSE, sizeof(response)) != 0) {
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ESP_LOGW(TAG, "Got wrong UART response from CM1106: %02X %02X %02X %02X", response[0], response[1], response[2],
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response[3]);
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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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ESP_LOGD(TAG, "CM1106 Successfully calibrated sensor to %uppm", ppm);
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}
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bool CM1106Component::cm1106_write_command_(const uint8_t *command, size_t command_len, uint8_t *response,
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size_t response_len) {
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// Empty RX Buffer
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while (this->available())
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this->read();
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this->write_array(command, command_len - 1);
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this->write_byte(cm1106_checksum(command, command_len));
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this->flush();
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if (response == nullptr)
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return true;
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return this->read_array(response, response_len);
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}
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void CM1106Component::dump_config() {
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ESP_LOGCONFIG(TAG, "CM1106:");
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LOG_SENSOR(" ", "CO2", this->co2_sensor_);
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this->check_uart_settings(9600);
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if (this->is_failed()) {
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ESP_LOGE(TAG, ESP_LOG_MSG_COMM_FAIL);
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}
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}
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} // namespace cm1106
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} // namespace esphome
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