mirror of https://github.com/esphome/esphome.git
168 lines
4.3 KiB
C++
168 lines
4.3 KiB
C++
#include "shtcx.h"
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#include "esphome/core/log.h"
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#include "esphome/core/hal.h"
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namespace esphome {
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namespace shtcx {
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static const char *const TAG = "shtcx";
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static const uint16_t SHTCX_COMMAND_SLEEP = 0xB098;
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static const uint16_t SHTCX_COMMAND_WAKEUP = 0x3517;
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static const uint16_t SHTCX_COMMAND_READ_ID_REGISTER = 0xEFC8;
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static const uint16_t SHTCX_COMMAND_SOFT_RESET = 0x805D;
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static const uint16_t SHTCX_COMMAND_POLLING_H = 0x7866;
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inline const char *to_string(SHTCXType type) {
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switch (type) {
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case SHTCX_TYPE_SHTC3:
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return "SHTC3";
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case SHTCX_TYPE_SHTC1:
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return "SHTC1";
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default:
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return "[Unknown model]";
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}
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}
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void SHTCXComponent::setup() {
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ESP_LOGCONFIG(TAG, "Setting up SHTCx...");
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this->wake_up();
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this->soft_reset();
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if (!this->write_command_(SHTCX_COMMAND_READ_ID_REGISTER)) {
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ESP_LOGE(TAG, "Error requesting Device ID");
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this->mark_failed();
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return;
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}
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uint16_t device_id_register[1];
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if (!this->read_data_(device_id_register, 1)) {
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ESP_LOGE(TAG, "Error reading Device ID");
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this->mark_failed();
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return;
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}
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if (((device_id_register[0] << 2) & 0x1C) == 0x1C) {
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if ((device_id_register[0] & 0x847) == 0x847) {
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this->type_ = SHTCX_TYPE_SHTC3;
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} else {
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this->type_ = SHTCX_TYPE_SHTC1;
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}
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} else {
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this->type_ = SHTCX_TYPE_UNKNOWN;
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}
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ESP_LOGCONFIG(TAG, " Device identified: %s", to_string(this->type_));
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}
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void SHTCXComponent::dump_config() {
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ESP_LOGCONFIG(TAG, "SHTCx:");
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ESP_LOGCONFIG(TAG, " Model: %s", to_string(this->type_));
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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 SHTCx failed!");
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}
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LOG_UPDATE_INTERVAL(this);
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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 SHTCXComponent::get_setup_priority() const { return setup_priority::DATA; }
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void SHTCXComponent::update() {
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if (this->status_has_warning()) {
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ESP_LOGW(TAG, "Retrying to reconnect the sensor.");
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this->soft_reset();
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}
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if (this->type_ != SHTCX_TYPE_SHTC1) {
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this->wake_up();
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}
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if (!this->write_command_(SHTCX_COMMAND_POLLING_H)) {
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this->status_set_warning();
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return;
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}
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this->set_timeout(50, [this]() {
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uint16_t raw_data[2];
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if (!this->read_data_(raw_data, 2)) {
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this->status_set_warning();
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return;
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}
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float temperature = 175.0f * float(raw_data[0]) / 65536.0f - 45.0f;
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float humidity = 100.0f * float(raw_data[1]) / 65536.0f;
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ESP_LOGD(TAG, "Got temperature=%.2f°C humidity=%.2f%%", 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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if (this->type_ != SHTCX_TYPE_SHTC1) {
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this->sleep();
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}
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});
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}
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bool SHTCXComponent::write_command_(uint16_t command) {
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// Warning ugly, trick the I2Ccomponent base by setting register to the first 8 bit.
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return this->write_byte(command >> 8, command & 0xFF);
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}
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uint8_t sht_crc(uint8_t data1, uint8_t data2) {
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uint8_t bit;
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uint8_t crc = 0xFF;
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crc ^= data1;
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for (bit = 8; bit > 0; --bit) {
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if (crc & 0x80) {
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crc = (crc << 1) ^ 0x131;
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} else {
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crc = (crc << 1);
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}
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}
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crc ^= data2;
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for (bit = 8; bit > 0; --bit) {
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if (crc & 0x80) {
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crc = (crc << 1) ^ 0x131;
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} else {
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crc = (crc << 1);
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}
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}
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return crc;
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}
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bool SHTCXComponent::read_data_(uint16_t *data, uint8_t len) {
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const uint8_t num_bytes = len * 3;
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std::vector<uint8_t> buf(num_bytes);
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if (this->read(buf.data(), num_bytes) != i2c::ERROR_OK) {
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return false;
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}
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for (uint8_t i = 0; i < len; i++) {
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const uint8_t j = 3 * i;
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uint8_t crc = sht_crc(buf[j], buf[j + 1]);
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if (crc != buf[j + 2]) {
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ESP_LOGE(TAG, "CRC8 Checksum invalid! 0x%02X != 0x%02X", buf[j + 2], crc);
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return false;
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}
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data[i] = (buf[j] << 8) | buf[j + 1];
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}
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return true;
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}
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void SHTCXComponent::soft_reset() {
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this->write_command_(SHTCX_COMMAND_SOFT_RESET);
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delayMicroseconds(200);
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}
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void SHTCXComponent::sleep() { this->write_command_(SHTCX_COMMAND_SLEEP); }
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void SHTCXComponent::wake_up() {
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this->write_command_(SHTCX_COMMAND_WAKEUP);
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delayMicroseconds(200);
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}
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} // namespace shtcx
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} // namespace esphome
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