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Add OpenTherm component (part 1: communication layer and hub) (#6645)

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Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
Oleg Tarasov 2024-09-16 00:59:10 +03:00 committed by GitHub
parent cf4bfcdce8
commit de19d25a3c
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1
CODEOWNERS
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@ -289,6 +289,7 @@ esphome/components/noblex/* @AGalfra
esphome/components/number/* @esphome/core esphome/components/number/* @esphome/core
esphome/components/one_wire/* @ssieb esphome/components/one_wire/* @ssieb
esphome/components/online_image/* @guillempages esphome/components/online_image/* @guillempages
esphome/components/opentherm/* @olegtarasov
esphome/components/ota/* @esphome/core esphome/components/ota/* @esphome/core
esphome/components/output/* @esphome/core esphome/components/output/* @esphome/core
esphome/components/pca6416a/* @Mat931 esphome/components/pca6416a/* @Mat931

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esphome/components/opentherm/__init__.py Normal file
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from typing import Any
from esphome import pins
import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.const import CONF_ID, PLATFORM_ESP32, PLATFORM_ESP8266
CODEOWNERS = ["@olegtarasov"]
MULTI_CONF = True
CONF_IN_PIN = "in_pin"
CONF_OUT_PIN = "out_pin"
CONF_CH_ENABLE = "ch_enable"
CONF_DHW_ENABLE = "dhw_enable"
CONF_COOLING_ENABLE = "cooling_enable"
CONF_OTC_ACTIVE = "otc_active"
CONF_CH2_ACTIVE = "ch2_active"
CONF_SYNC_MODE = "sync_mode"
opentherm_ns = cg.esphome_ns.namespace("opentherm")
OpenthermHub = opentherm_ns.class_("OpenthermHub", cg.Component)
CONFIG_SCHEMA = cv.All(
cv.Schema(
{
cv.GenerateID(): cv.declare_id(OpenthermHub),
cv.Required(CONF_IN_PIN): pins.internal_gpio_input_pin_schema,
cv.Required(CONF_OUT_PIN): pins.internal_gpio_output_pin_schema,
cv.Optional(CONF_CH_ENABLE, True): cv.boolean,
cv.Optional(CONF_DHW_ENABLE, True): cv.boolean,
cv.Optional(CONF_COOLING_ENABLE, False): cv.boolean,
cv.Optional(CONF_OTC_ACTIVE, False): cv.boolean,
cv.Optional(CONF_CH2_ACTIVE, False): cv.boolean,
cv.Optional(CONF_SYNC_MODE, False): cv.boolean,
}
).extend(cv.COMPONENT_SCHEMA),
cv.only_on([PLATFORM_ESP32, PLATFORM_ESP8266]),
)
async def to_code(config: dict[str, Any]) -> None:
# Create the hub, passing the two callbacks defined below
# Since the hub is used in the callbacks, we need to define it first
var = cg.new_Pvariable(config[CONF_ID])
await cg.register_component(var, config)
# Set pins
in_pin = await cg.gpio_pin_expression(config[CONF_IN_PIN])
cg.add(var.set_in_pin(in_pin))
out_pin = await cg.gpio_pin_expression(config[CONF_OUT_PIN])
cg.add(var.set_out_pin(out_pin))
non_sensors = {CONF_ID, CONF_IN_PIN, CONF_OUT_PIN}
for key, value in config.items():
if key not in non_sensors:
cg.add(getattr(var, f"set_{key}")(value))

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esphome/components/opentherm/hub.cpp Normal file
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#include "hub.h"
#include "esphome/core/helpers.h"
#include <string>
namespace esphome {
namespace opentherm {
static const char *const TAG = "opentherm";
OpenthermData OpenthermHub::build_request_(MessageId request_id) {
OpenthermData data;
data.type = 0;
data.id = 0;
data.valueHB = 0;
data.valueLB = 0;
// First, handle the status request. This requires special logic, because we
// wouldn't want to inadvertently disable domestic hot water, for example.
// It is also included in the macro-generated code below, but that will
// never be executed, because we short-circuit it here.
if (request_id == MessageId::STATUS) {
bool const ch_enabled = this->ch_enable;
bool dhw_enabled = this->dhw_enable;
bool cooling_enabled = this->cooling_enable;
bool otc_enabled = this->otc_active;
bool ch2_enabled = this->ch2_active;
data.type = MessageType::READ_DATA;
data.id = MessageId::STATUS;
data.valueHB = ch_enabled | (dhw_enabled << 1) | (cooling_enabled << 2) | (otc_enabled << 3) | (ch2_enabled << 4);
// Disable incomplete switch statement warnings, because the cases in each
// switch are generated based on the configured sensors and inputs.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wswitch"
// TODO: This is a placeholder for an auto-generated switch statement which builds request structure based on
// which sensors are enabled in config.
#pragma GCC diagnostic pop
return data;
}
return OpenthermData();
}
OpenthermHub::OpenthermHub() : Component() {}
void OpenthermHub::process_response(OpenthermData &data) {
ESP_LOGD(TAG, "Received OpenTherm response with id %d (%s)", data.id,
this->opentherm_->message_id_to_str((MessageId) data.id));
ESP_LOGD(TAG, "%s", this->opentherm_->debug_data(data).c_str());
}
void OpenthermHub::setup() {
ESP_LOGD(TAG, "Setting up OpenTherm component");
this->opentherm_ = make_unique<OpenTherm>(this->in_pin_, this->out_pin_);
if (!this->opentherm_->initialize()) {
ESP_LOGE(TAG, "Failed to initialize OpenTherm protocol. See previous log messages for details.");
this->mark_failed();
return;
}
// Ensure that there is at least one request, as we are required to
// communicate at least once every second. Sending the status request is
// good practice anyway.
this->add_repeating_message(MessageId::STATUS);
this->current_message_iterator_ = this->initial_messages_.begin();
}
void OpenthermHub::on_shutdown() { this->opentherm_->stop(); }
void OpenthermHub::loop() {
if (this->sync_mode_) {
this->sync_loop_();
return;
}
auto cur_time = millis();
auto const cur_mode = this->opentherm_->get_mode();
switch (cur_mode) {
case OperationMode::WRITE:
case OperationMode::READ:
case OperationMode::LISTEN:
if (!this->check_timings_(cur_time)) {
break;
}
this->last_mode_ = cur_mode;
break;
case OperationMode::ERROR_PROTOCOL:
if (this->last_mode_ == OperationMode::WRITE) {
this->handle_protocol_write_error_();
} else if (this->last_mode_ == OperationMode::READ) {
this->handle_protocol_read_error_();
}
this->stop_opentherm_();
break;
case OperationMode::ERROR_TIMEOUT:
this->handle_timeout_error_();
this->stop_opentherm_();
break;
case OperationMode::IDLE:
if (this->should_skip_loop_(cur_time)) {
break;
}
this->start_conversation_();
break;
case OperationMode::SENT:
// Message sent, now listen for the response.
this->opentherm_->listen();
break;
case OperationMode::RECEIVED:
this->read_response_();
break;
}
}
void OpenthermHub::sync_loop_() {
if (!this->opentherm_->is_idle()) {
ESP_LOGE(TAG, "OpenTherm is not idle at the start of the loop");
return;
}
auto cur_time = millis();
this->check_timings_(cur_time);
if (this->should_skip_loop_(cur_time)) {
return;
}
this->start_conversation_();
if (!this->spin_wait_(1150, [&] { return this->opentherm_->is_active(); })) {
ESP_LOGE(TAG, "Hub timeout triggered during send");
this->stop_opentherm_();
return;
}
if (this->opentherm_->is_error()) {
this->handle_protocol_write_error_();
this->stop_opentherm_();
return;
} else if (!this->opentherm_->is_sent()) {
ESP_LOGW(TAG, "Unexpected state after sending request: %s",
this->opentherm_->operation_mode_to_str(this->opentherm_->get_mode()));
this->stop_opentherm_();
return;
}
// Listen for the response
this->opentherm_->listen();
if (!this->spin_wait_(1150, [&] { return this->opentherm_->is_active(); })) {
ESP_LOGE(TAG, "Hub timeout triggered during receive");
this->stop_opentherm_();
return;
}
if (this->opentherm_->is_timeout()) {
this->handle_timeout_error_();
this->stop_opentherm_();
return;
} else if (this->opentherm_->is_protocol_error()) {
this->handle_protocol_read_error_();
this->stop_opentherm_();
return;
} else if (!this->opentherm_->has_message()) {
ESP_LOGW(TAG, "Unexpected state after receiving response: %s",
this->opentherm_->operation_mode_to_str(this->opentherm_->get_mode()));
this->stop_opentherm_();
return;
}
this->read_response_();
}
bool OpenthermHub::check_timings_(uint32_t cur_time) {
if (this->last_conversation_start_ > 0 && (cur_time - this->last_conversation_start_) > 1150) {
ESP_LOGW(TAG,
"%d ms elapsed since the start of the last convo, but 1150 ms are allowed at maximum. Look at other "
"components that might slow the loop down.",
(int) (cur_time - this->last_conversation_start_));
this->stop_opentherm_();
return false;
}
return true;
}
bool OpenthermHub::should_skip_loop_(uint32_t cur_time) const {
if (this->last_conversation_end_ > 0 && (cur_time - this->last_conversation_end_) < 100) {
ESP_LOGV(TAG, "Less than 100 ms elapsed since last convo, skipping this iteration");
return true;
}
return false;
}
void OpenthermHub::start_conversation_() {
if (this->sending_initial_ && this->current_message_iterator_ == this->initial_messages_.end()) {
this->sending_initial_ = false;
this->current_message_iterator_ = this->repeating_messages_.begin();
} else if (this->current_message_iterator_ == this->repeating_messages_.end()) {
this->current_message_iterator_ = this->repeating_messages_.begin();
}
auto request = this->build_request_(*this->current_message_iterator_);
ESP_LOGD(TAG, "Sending request with id %d (%s)", request.id,
this->opentherm_->message_id_to_str((MessageId) request.id));
ESP_LOGD(TAG, "%s", this->opentherm_->debug_data(request).c_str());
// Send the request
this->last_conversation_start_ = millis();
this->opentherm_->send(request);
}
void OpenthermHub::read_response_() {
OpenthermData response;
if (!this->opentherm_->get_message(response)) {
ESP_LOGW(TAG, "Couldn't get the response, but flags indicated success. This is a bug.");
this->stop_opentherm_();
return;
}
this->stop_opentherm_();
this->process_response(response);
this->current_message_iterator_++;
}
void OpenthermHub::stop_opentherm_() {
this->opentherm_->stop();
this->last_conversation_end_ = millis();
}
void OpenthermHub::handle_protocol_write_error_() {
ESP_LOGW(TAG, "Error while sending request: %s",
this->opentherm_->operation_mode_to_str(this->opentherm_->get_mode()));
ESP_LOGW(TAG, "%s", this->opentherm_->debug_data(this->last_request_).c_str());
}
void OpenthermHub::handle_protocol_read_error_() {
OpenThermError error;
this->opentherm_->get_protocol_error(error);
ESP_LOGW(TAG, "Protocol error occured while receiving response: %s", this->opentherm_->debug_error(error).c_str());
}
void OpenthermHub::handle_timeout_error_() {
ESP_LOGW(TAG, "Receive response timed out at a protocol level");
this->stop_opentherm_();
}
#define ID(x) x
#define SHOW2(x) #x
#define SHOW(x) SHOW2(x)
void OpenthermHub::dump_config() {
ESP_LOGCONFIG(TAG, "OpenTherm:");
LOG_PIN(" In: ", this->in_pin_);
LOG_PIN(" Out: ", this->out_pin_);
ESP_LOGCONFIG(TAG, " Sync mode: %d", this->sync_mode_);
ESP_LOGCONFIG(TAG, " Initial requests:");
for (auto type : this->initial_messages_) {
ESP_LOGCONFIG(TAG, " - %d", type);
}
ESP_LOGCONFIG(TAG, " Repeating requests:");
for (auto type : this->repeating_messages_) {
ESP_LOGCONFIG(TAG, " - %d", type);
}
}
} // namespace opentherm
} // namespace esphome

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esphome/components/opentherm/hub.h Normal file
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#pragma once
#include "esphome/core/defines.h"
#include "esphome/core/hal.h"
#include "esphome/core/component.h"
#include "esphome/core/log.h"
#include "opentherm.h"
#include <memory>
#include <unordered_map>
#include <unordered_set>
#include <functional>
namespace esphome {
namespace opentherm {
// OpenTherm component for ESPHome
class OpenthermHub : public Component {
protected:
// Communication pins for the OpenTherm interface
InternalGPIOPin *in_pin_, *out_pin_;
// The OpenTherm interface
std::unique_ptr<OpenTherm> opentherm_;
// The set of initial messages to send on starting communication with the boiler
std::unordered_set<MessageId> initial_messages_;
// and the repeating messages which are sent repeatedly to update various sensors
// and boiler parameters (like the setpoint).
std::unordered_set<MessageId> repeating_messages_;
// Indicates if we are still working on the initial requests or not
bool sending_initial_ = true;
// Index for the current request in one of the _requests sets.
std::unordered_set<MessageId>::const_iterator current_message_iterator_;
uint32_t last_conversation_start_ = 0;
uint32_t last_conversation_end_ = 0;
OperationMode last_mode_ = IDLE;
OpenthermData last_request_;
// Synchronous communication mode prevents other components from disabling interrupts while
// we are talking to the boiler. Enable if you experience random intermittent invalid response errors.
// Very likely to happen while using Dallas temperature sensors.
bool sync_mode_ = false;
// Create OpenTherm messages based on the message id
OpenthermData build_request_(MessageId request_id);
void handle_protocol_write_error_();
void handle_protocol_read_error_();
void handle_timeout_error_();
void stop_opentherm_();
void start_conversation_();
void read_response_();
bool check_timings_(uint32_t cur_time);
bool should_skip_loop_(uint32_t cur_time) const;
void sync_loop_();
template<typename F> bool spin_wait_(uint32_t timeout, F func) {
auto start_time = millis();
while (func()) {
yield();
auto cur_time = millis();
if (cur_time - start_time >= timeout) {
return false;
}
}
return true;
}
public:
// Constructor with references to the global interrupt handlers
OpenthermHub();
// Handle responses from the OpenTherm interface
void process_response(OpenthermData &data);
// Setters for the input and output OpenTherm interface pins
void set_in_pin(InternalGPIOPin *in_pin) { this->in_pin_ = in_pin; }
void set_out_pin(InternalGPIOPin *out_pin) { this->out_pin_ = out_pin; }
// Add a request to the set of initial requests
void add_initial_message(MessageId message_id) { this->initial_messages_.insert(message_id); }
// Add a request to the set of repeating requests. Note that a large number of repeating
// requests will slow down communication with the boiler. Each request may take up to 1 second,
// so with all sensors enabled, it may take about half a minute before a change in setpoint
// will be processed.
void add_repeating_message(MessageId message_id) { this->repeating_messages_.insert(message_id); }
// There are five status variables, which can either be set as a simple variable,
// or using a switch. ch_enable and dhw_enable default to true, the others to false.
bool ch_enable = true, dhw_enable = true, cooling_enable = false, otc_active = false, ch2_active = false;
// Setters for the status variables
void set_ch_enable(bool value) { this->ch_enable = value; }
void set_dhw_enable(bool value) { this->dhw_enable = value; }
void set_cooling_enable(bool value) { this->cooling_enable = value; }
void set_otc_active(bool value) { this->otc_active = value; }
void set_ch2_active(bool value) { this->ch2_active = value; }
void set_sync_mode(bool sync_mode) { this->sync_mode_ = sync_mode; }
float get_setup_priority() const override { return setup_priority::HARDWARE; }
void setup() override;
void on_shutdown() override;
void loop() override;
void dump_config() override;
};
} // namespace opentherm
} // namespace esphome

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esphome/components/opentherm/opentherm.cpp Normal file
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/*
* OpenTherm protocol implementation. Originally taken from https://github.com/jpraus/arduino-opentherm, but
* heavily modified to comply with ESPHome coding standards and provide better logging.
* Original code is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
* Public License, which is compatible with GPLv3 license, which covers C++ part of ESPHome project.
*/
#include "opentherm.h"
#include "esphome/core/helpers.h"
#if defined(ESP32) || defined(USE_ESP_IDF)
#include "driver/timer.h"
#include "esp_err.h"
#endif
#ifdef ESP8266
#include "Arduino.h"
#endif
#include <string>
#include <sstream>
#include <bitset>
namespace esphome {
namespace opentherm {
using std::string;
using std::bitset;
using std::stringstream;
using std::to_string;
static const char *const TAG = "opentherm";
#ifdef ESP8266
OpenTherm *OpenTherm::instance_ = nullptr;
#endif
OpenTherm::OpenTherm(InternalGPIOPin *in_pin, InternalGPIOPin *out_pin, int32_t device_timeout)
: in_pin_(in_pin),
out_pin_(out_pin),
#if defined(ESP32) || defined(USE_ESP_IDF)
timer_group_(TIMER_GROUP_0),
timer_idx_(TIMER_0),
#endif
mode_(OperationMode::IDLE),
error_type_(ProtocolErrorType::NO_ERROR),
capture_(0),
clock_(0),
data_(0),
bit_pos_(0),
timeout_counter_(-1),
device_timeout_(device_timeout) {
this->isr_in_pin_ = in_pin->to_isr();
this->isr_out_pin_ = out_pin->to_isr();
}
bool OpenTherm::initialize() {
#ifdef ESP8266
OpenTherm::instance_ = this;
#endif
this->in_pin_->pin_mode(gpio::FLAG_INPUT);
this->out_pin_->pin_mode(gpio::FLAG_OUTPUT);
this->out_pin_->digital_write(true);
#if defined(ESP32) || defined(USE_ESP_IDF)
return this->init_esp32_timer_();
#else
return true;
#endif
}
void OpenTherm::listen() {
this->stop_timer_();
this->timeout_counter_ = this->device_timeout_ * 5; // timer_ ticks at 5 ticks/ms
this->mode_ = OperationMode::LISTEN;
this->data_ = 0;
this->bit_pos_ = 0;
this->start_read_timer_();
}
void OpenTherm::send(OpenthermData &data) {
this->stop_timer_();
this->data_ = data.type;
this->data_ = (this->data_ << 12) | data.id;
this->data_ = (this->data_ << 8) | data.valueHB;
this->data_ = (this->data_ << 8) | data.valueLB;
if (!check_parity_(this->data_)) {
this->data_ = this->data_ | 0x80000000;
}
this->clock_ = 1; // clock starts at HIGH
this->bit_pos_ = 33; // count down (33 == start bit, 32-1 data, 0 == stop bit)
this->mode_ = OperationMode::WRITE;
this->start_write_timer_();
}
bool OpenTherm::get_message(OpenthermData &data) {
if (this->mode_ == OperationMode::RECEIVED) {
data.type = (this->data_ >> 28) & 0x7;
data.id = (this->data_ >> 16) & 0xFF;
data.valueHB = (this->data_ >> 8) & 0xFF;
data.valueLB = this->data_ & 0xFF;
return true;
}
return false;
}
bool OpenTherm::get_protocol_error(OpenThermError &error) {
if (this->mode_ != OperationMode::ERROR_PROTOCOL) {
return false;
}
error.error_type = this->error_type_;
error.bit_pos = this->bit_pos_;
error.capture = this->capture_;
error.clock = this->clock_;
error.data = this->data_;
return true;
}
void OpenTherm::stop() {
this->stop_timer_();
this->mode_ = OperationMode::IDLE;
}
void IRAM_ATTR OpenTherm::read_() {
this->data_ = 0;
this->bit_pos_ = 0;
this->mode_ = OperationMode::READ;
this->capture_ = 1; // reset counter and add as if read start bit
this->clock_ = 1; // clock is high at the start of comm
this->start_read_timer_(); // get us into 1/4 of manchester code. 5 timer ticks constitute 1 ms, which is 1 bit
// period in OpenTherm.
}
bool IRAM_ATTR OpenTherm::timer_isr(OpenTherm *arg) {
if (arg->mode_ == OperationMode::LISTEN) {
if (arg->timeout_counter_ == 0) {
arg->mode_ = OperationMode::ERROR_TIMEOUT;
arg->stop_timer_();
return false;
}
bool const value = arg->isr_in_pin_.digital_read();
if (value) { // incoming data (rising signal)
arg->read_();
}
if (arg->timeout_counter_ > 0) {
arg->timeout_counter_--;
}
} else if (arg->mode_ == OperationMode::READ) {
bool const value = arg->isr_in_pin_.digital_read();
uint8_t const last = (arg->capture_ & 1);
if (value != last) {
// transition of signal from last sampling
if (arg->clock_ == 1 && arg->capture_ > 0xF) {
// no transition in the middle of the bit
arg->mode_ = OperationMode::ERROR_PROTOCOL;
arg->error_type_ = ProtocolErrorType::NO_TRANSITION;
arg->stop_timer_();
return false;
} else if (arg->clock_ == 1 || arg->capture_ > 0xF) {
// transition in the middle of the bit OR no transition between two bit, both are valid data points
if (arg->bit_pos_ == BitPositions::STOP_BIT) {
// expecting stop bit
auto stop_bit_error = arg->verify_stop_bit_(last);
if (stop_bit_error == ProtocolErrorType::NO_ERROR) {
arg->mode_ = OperationMode::RECEIVED;
arg->stop_timer_();
return false;
} else {
// end of data not verified, invalid data
arg->mode_ = OperationMode::ERROR_PROTOCOL;
arg->error_type_ = stop_bit_error;
arg->stop_timer_();
return false;
}
} else {
// normal data point at clock high
arg->bit_read_(last);
arg->clock_ = 0;
}
} else {
// clock low, not a data point, switch clock
arg->clock_ = 1;
}
arg->capture_ = 1; // reset counter
} else if (arg->capture_ > 0xFF) {
// no change for too long, invalid mancheter encoding
arg->mode_ = OperationMode::ERROR_PROTOCOL;
arg->error_type_ = ProtocolErrorType::NO_CHANGE_TOO_LONG;
arg->stop_timer_();
return false;
}
arg->capture_ = (arg->capture_ << 1) | value;
} else if (arg->mode_ == OperationMode::WRITE) {
// write data to pin
if (arg->bit_pos_ == 33 || arg->bit_pos_ == 0) { // start bit
arg->write_bit_(1, arg->clock_);
} else { // data bits
arg->write_bit_(read_bit(arg->data_, arg->bit_pos_ - 1), arg->clock_);
}
if (arg->clock_ == 0) {
if (arg->bit_pos_ <= 0) { // check termination
arg->mode_ = OperationMode::SENT; // all data written
arg->stop_timer_();
}
arg->bit_pos_--;
arg->clock_ = 1;
} else {
arg->clock_ = 0;
}
}
return false;
}
#ifdef ESP8266
void IRAM_ATTR OpenTherm::esp8266_timer_isr() { OpenTherm::timer_isr(OpenTherm::instance_); }
#endif
void IRAM_ATTR OpenTherm::bit_read_(uint8_t value) {
this->data_ = (this->data_ << 1) | value;
this->bit_pos_++;
}
ProtocolErrorType OpenTherm::verify_stop_bit_(uint8_t value) {
if (value) { // stop bit detected
return check_parity_(this->data_) ? ProtocolErrorType::NO_ERROR : ProtocolErrorType::PARITY_ERROR;
} else { // no stop bit detected, error
return ProtocolErrorType::INVALID_STOP_BIT;
}
}
void IRAM_ATTR OpenTherm::write_bit_(uint8_t high, uint8_t clock) {
if (clock == 1) { // left part of manchester encoding
this->isr_out_pin_.digital_write(!high); // low means logical 1 to protocol
} else { // right part of manchester encoding
this->isr_out_pin_.digital_write(high); // high means logical 0 to protocol
}
}
#if defined(ESP32) || defined(USE_ESP_IDF)
bool OpenTherm::init_esp32_timer_() {
// Search for a free timer. Maybe unstable, we'll see.
int cur_timer = 0;
timer_group_t timer_group = TIMER_GROUP_0;
timer_idx_t timer_idx = TIMER_0;
bool timer_found = false;
for (; cur_timer < SOC_TIMER_GROUP_TOTAL_TIMERS; cur_timer++) {
timer_config_t temp_config;
timer_group = cur_timer < 2 ? TIMER_GROUP_0 : TIMER_GROUP_1;
timer_idx = cur_timer < 2 ? (timer_idx_t) cur_timer : (timer_idx_t) (cur_timer - 2);
auto err = timer_get_config(timer_group, timer_idx, &temp_config);
if (err == ESP_ERR_INVALID_ARG) {
// Error means timer was not initialized (or other things, but we are careful with our args)
timer_found = true;
break;
}
ESP_LOGD(TAG, "Timer %d:%d seems to be occupied, will try another", timer_group, timer_idx);
}
if (!timer_found) {
ESP_LOGE(TAG, "No free timer was found! OpenTherm cannot function without a timer.");
return false;
}
ESP_LOGD(TAG, "Found free timer %d:%d", timer_group, timer_idx);
this->timer_group_ = timer_group;
this->timer_idx_ = timer_idx;
timer_config_t const config = {
.alarm_en = TIMER_ALARM_EN,
.counter_en = TIMER_PAUSE,
.intr_type = TIMER_INTR_LEVEL,
.counter_dir = TIMER_COUNT_UP,
.auto_reload = TIMER_AUTORELOAD_EN,
#if ESP_IDF_VERSION_MAJOR >= 5
.clk_src = TIMER_SRC_CLK_DEFAULT,
#endif
.divider = 80,
};
esp_err_t result;
result = timer_init(this->timer_group_, this->timer_idx_, &config);
if (result != ESP_OK) {
const auto *error = esp_err_to_name(result);
ESP_LOGE(TAG, "Failed to init timer. Error: %s", error);
return false;
}
result = timer_set_counter_value(this->timer_group_, this->timer_idx_, 0);
if (result != ESP_OK) {
const auto *error = esp_err_to_name(result);
ESP_LOGE(TAG, "Failed to set counter value. Error: %s", error);
return false;
}
result = timer_isr_callback_add(this->timer_group_, this->timer_idx_, reinterpret_cast<bool (*)(void *)>(timer_isr),
this, 0);
if (result != ESP_OK) {
const auto *error = esp_err_to_name(result);
ESP_LOGE(TAG, "Failed to register timer interrupt. Error: %s", error);
return false;
}
return true;
}
void IRAM_ATTR OpenTherm::start_esp32_timer_(uint64_t alarm_value) {
esp_err_t result;
result = timer_set_alarm_value(this->timer_group_, this->timer_idx_, alarm_value);
if (result != ESP_OK) {
const auto *error = esp_err_to_name(result);
ESP_LOGE(TAG, "Failed to set alarm value. Error: %s", error);
return;
}
result = timer_start(this->timer_group_, this->timer_idx_);
if (result != ESP_OK) {
const auto *error = esp_err_to_name(result);
ESP_LOGE(TAG, "Failed to start the timer. Error: %s", error);
return;
}
}
// 5 kHz timer_
void IRAM_ATTR OpenTherm::start_read_timer_() {
InterruptLock const lock;
this->start_esp32_timer_(200);
}
// 2 kHz timer_
void IRAM_ATTR OpenTherm::start_write_timer_() {
InterruptLock const lock;
this->start_esp32_timer_(500);
}
void IRAM_ATTR OpenTherm::stop_timer_() {
InterruptLock const lock;
esp_err_t result;
result = timer_pause(this->timer_group_, this->timer_idx_);
if (result != ESP_OK) {
const auto *error = esp_err_to_name(result);
ESP_LOGE(TAG, "Failed to pause the timer. Error: %s", error);
return;
}
result = timer_set_counter_value(this->timer_group_, this->timer_idx_, 0);
if (result != ESP_OK) {
const auto *error = esp_err_to_name(result);
ESP_LOGE(TAG, "Failed to set timer counter to 0 after pausing. Error: %s", error);
return;
}
}
#endif // END ESP32
#ifdef ESP8266
// 5 kHz timer_
void OpenTherm::start_read_timer_() {
InterruptLock const lock;
timer1_attachInterrupt(OpenTherm::esp8266_timer_isr);
timer1_enable(TIM_DIV16, TIM_EDGE, TIM_LOOP); // 5MHz (5 ticks/us - 1677721.4 us max)
timer1_write(1000); // 5kHz
}
// 2 kHz timer_
void OpenTherm::start_write_timer_() {
InterruptLock const lock;
timer1_attachInterrupt(OpenTherm::esp8266_timer_isr);
timer1_enable(TIM_DIV16, TIM_EDGE, TIM_LOOP); // 5MHz (5 ticks/us - 1677721.4 us max)
timer1_write(2500); // 2kHz
}
void OpenTherm::stop_timer_() {
InterruptLock const lock;
timer1_disable();
timer1_detachInterrupt();
}
#endif // END ESP8266
// https://stackoverflow.com/questions/21617970/how-to-check-if-value-has-even-parity-of-bits-or-odd
bool OpenTherm::check_parity_(uint32_t val) {
val ^= val >> 16;
val ^= val >> 8;
val ^= val >> 4;
val ^= val >> 2;
val ^= val >> 1;
return (~val) & 1;
}
#define TO_STRING_MEMBER(name) \
case name: \
return #name;
const char *OpenTherm::operation_mode_to_str(OperationMode mode) {
switch (mode) {
TO_STRING_MEMBER(IDLE)
TO_STRING_MEMBER(LISTEN)
TO_STRING_MEMBER(READ)
TO_STRING_MEMBER(RECEIVED)
TO_STRING_MEMBER(WRITE)
TO_STRING_MEMBER(SENT)
TO_STRING_MEMBER(ERROR_PROTOCOL)
TO_STRING_MEMBER(ERROR_TIMEOUT)
default:
return "<INVALID>";
}
}
const char *OpenTherm::protocol_error_to_to_str(ProtocolErrorType error_type) {
switch (error_type) {
TO_STRING_MEMBER(NO_ERROR)
TO_STRING_MEMBER(NO_TRANSITION)
TO_STRING_MEMBER(INVALID_STOP_BIT)
TO_STRING_MEMBER(PARITY_ERROR)
TO_STRING_MEMBER(NO_CHANGE_TOO_LONG)
default:
return "<INVALID>";
}
}
const char *OpenTherm::message_type_to_str(MessageType message_type) {
switch (message_type) {
TO_STRING_MEMBER(READ_DATA)
TO_STRING_MEMBER(READ_ACK)
TO_STRING_MEMBER(WRITE_DATA)
TO_STRING_MEMBER(WRITE_ACK)
TO_STRING_MEMBER(INVALID_DATA)
TO_STRING_MEMBER(DATA_INVALID)
TO_STRING_MEMBER(UNKNOWN_DATAID)
default:
return "<INVALID>";
}
}
const char *OpenTherm::message_id_to_str(MessageId id) {
switch (id) {
TO_STRING_MEMBER(STATUS)
TO_STRING_MEMBER(CH_SETPOINT)
TO_STRING_MEMBER(CONTROLLER_CONFIG)
TO_STRING_MEMBER(DEVICE_CONFIG)
TO_STRING_MEMBER(COMMAND_CODE)
TO_STRING_MEMBER(FAULT_FLAGS)
TO_STRING_MEMBER(REMOTE)
TO_STRING_MEMBER(COOLING_CONTROL)
TO_STRING_MEMBER(CH2_SETPOINT)
TO_STRING_MEMBER(CH_SETPOINT_OVERRIDE)
TO_STRING_MEMBER(TSP_COUNT)
TO_STRING_MEMBER(TSP_COMMAND)
TO_STRING_MEMBER(FHB_SIZE)
TO_STRING_MEMBER(FHB_COMMAND)
TO_STRING_MEMBER(MAX_MODULATION_LEVEL)
TO_STRING_MEMBER(MAX_BOILER_CAPACITY)
TO_STRING_MEMBER(ROOM_SETPOINT)
TO_STRING_MEMBER(MODULATION_LEVEL)
TO_STRING_MEMBER(CH_WATER_PRESSURE)
TO_STRING_MEMBER(DHW_FLOW_RATE)
TO_STRING_MEMBER(DAY_TIME)
TO_STRING_MEMBER(DATE)
TO_STRING_MEMBER(YEAR)
TO_STRING_MEMBER(ROOM_SETPOINT_CH2)
TO_STRING_MEMBER(ROOM_TEMP)
TO_STRING_MEMBER(FEED_TEMP)
TO_STRING_MEMBER(DHW_TEMP)
TO_STRING_MEMBER(OUTSIDE_TEMP)
TO_STRING_MEMBER(RETURN_WATER_TEMP)
TO_STRING_MEMBER(SOLAR_STORE_TEMP)
TO_STRING_MEMBER(SOLAR_COLLECT_TEMP)
TO_STRING_MEMBER(FEED_TEMP_CH2)
TO_STRING_MEMBER(DHW2_TEMP)
TO_STRING_MEMBER(EXHAUST_TEMP)
TO_STRING_MEMBER(FAN_SPEED)
TO_STRING_MEMBER(FLAME_CURRENT)
TO_STRING_MEMBER(DHW_BOUNDS)
TO_STRING_MEMBER(CH_BOUNDS)
TO_STRING_MEMBER(OTC_CURVE_BOUNDS)
TO_STRING_MEMBER(DHW_SETPOINT)
TO_STRING_MEMBER(MAX_CH_SETPOINT)
TO_STRING_MEMBER(OTC_CURVE_RATIO)
TO_STRING_MEMBER(HVAC_STATUS)
TO_STRING_MEMBER(REL_VENT_SETPOINT)
TO_STRING_MEMBER(DEVICE_VENT)
TO_STRING_MEMBER(REL_VENTILATION)
TO_STRING_MEMBER(REL_HUMID_EXHAUST)
TO_STRING_MEMBER(SUPPLY_INLET_TEMP)
TO_STRING_MEMBER(SUPPLY_OUTLET_TEMP)
TO_STRING_MEMBER(EXHAUST_INLET_TEMP)
TO_STRING_MEMBER(EXHAUST_OUTLET_TEMP)
TO_STRING_MEMBER(NOM_REL_VENTILATION)
TO_STRING_MEMBER(OVERRIDE_FUNC)
TO_STRING_MEMBER(OEM_DIAGNOSTIC)
TO_STRING_MEMBER(BURNER_STARTS)
TO_STRING_MEMBER(CH_PUMP_STARTS)
TO_STRING_MEMBER(DHW_PUMP_STARTS)
TO_STRING_MEMBER(DHW_BURNER_STARTS)
TO_STRING_MEMBER(BURNER_HOURS)
TO_STRING_MEMBER(CH_PUMP_HOURS)
TO_STRING_MEMBER(DHW_PUMP_HOURS)
TO_STRING_MEMBER(DHW_BURNER_HOURS)
TO_STRING_MEMBER(OT_VERSION_CONTROLLER)
TO_STRING_MEMBER(OT_VERSION_DEVICE)
TO_STRING_MEMBER(VERSION_CONTROLLER)
TO_STRING_MEMBER(VERSION_DEVICE)
default:
return "<INVALID>";
}
}
string OpenTherm::debug_data(OpenthermData &data) {
stringstream result;
result << bitset<8>(data.type) << " " << bitset<8>(data.id) << " " << bitset<8>(data.valueHB) << " "
<< bitset<8>(data.valueLB) << "\n";
result << "type: " << this->message_type_to_str((MessageType) data.type) << "; ";
result << "id: " << to_string(data.id) << "; ";
result << "HB: " << to_string(data.valueHB) << "; ";
result << "LB: " << to_string(data.valueLB) << "; ";
result << "uint_16: " << to_string(data.u16()) << "; ";
result << "float: " << to_string(data.f88());
return result.str();
}
std::string OpenTherm::debug_error(OpenThermError &error) {
stringstream result;
result << "type: " << this->protocol_error_to_to_str(error.error_type) << "; ";
result << "data: ";
result << format_hex(error.data);
result << "; clock: " << to_string(clock_);
result << "; capture: " << bitset<32>(error.capture);
result << "; bit_pos: " << to_string(error.bit_pos);
return result.str();
}
float OpenthermData::f88() { return ((float) this->s16()) / 256.0; }
void OpenthermData::f88(float value) { this->s16((int16_t) (value * 256)); }
uint16_t OpenthermData::u16() {
uint16_t const value = this->valueHB;
return (value << 8) | this->valueLB;
}
void OpenthermData::u16(uint16_t value) {
this->valueLB = value & 0xFF;
this->valueHB = (value >> 8) & 0xFF;
}
int16_t OpenthermData::s16() {
int16_t const value = this->valueHB;
return (value << 8) | this->valueLB;
}
void OpenthermData::s16(int16_t value) {
this->valueLB = value & 0xFF;
this->valueHB = (value >> 8) & 0xFF;
}
} // namespace opentherm
} // namespace esphome

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/*
* OpenTherm protocol implementation. Originally taken from https://github.com/jpraus/arduino-opentherm, but
* heavily modified to comply with ESPHome coding standards and provide better logging.
* Original code is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
* Public License, which is compatible with GPLv3 license, which covers C++ part of ESPHome project.
*/
#pragma once
#include <string>
#include <sstream>
#include <iomanip>
#include "esphome/core/hal.h"
#include "esphome/core/log.h"
#if defined(ESP32) || defined(USE_ESP_IDF)
#include "driver/timer.h"
#endif
namespace esphome {
namespace opentherm {
// TODO: Account for immutable semantics change in hub.cpp when doing later installments of OpenTherm PR
template<class T> constexpr T read_bit(T value, uint8_t bit) { return (value >> bit) & 0x01; }
template<class T> constexpr T set_bit(T value, uint8_t bit) { return value |= (1UL << bit); }
template<class T> constexpr T clear_bit(T value, uint8_t bit) { return value &= ~(1UL << bit); }
template<class T> constexpr T write_bit(T value, uint8_t bit, uint8_t bit_value) {
return bit_value ? setBit(value, bit) : clearBit(value, bit);
}
enum OperationMode {
IDLE = 0, // no operation
LISTEN = 1, // waiting for transmission to start
READ = 2, // reading 32-bit data frame
RECEIVED = 3, // data frame received with valid start and stop bit
WRITE = 4, // writing data with timer_
SENT = 5, // all data written to output
ERROR_PROTOCOL = 8, // manchester protocol data transfer error
ERROR_TIMEOUT = 9 // read timeout
};
enum ProtocolErrorType {
NO_ERROR = 0, // No error
NO_TRANSITION = 1, // No transition in the middle of the bit
INVALID_STOP_BIT = 2, // Stop bit wasn't present when expected
PARITY_ERROR = 3, // Parity check didn't pass
NO_CHANGE_TOO_LONG = 4, // No level change for too much timer ticks
};
enum MessageType {
READ_DATA = 0,
READ_ACK = 4,
WRITE_DATA = 1,
WRITE_ACK = 5,
INVALID_DATA = 2,
DATA_INVALID = 6,
UNKNOWN_DATAID = 7
};
enum MessageId {
STATUS = 0,
CH_SETPOINT = 1,
CONTROLLER_CONFIG = 2,
DEVICE_CONFIG = 3,
COMMAND_CODE = 4,
FAULT_FLAGS = 5,
REMOTE = 6,
COOLING_CONTROL = 7,
CH2_SETPOINT = 8,
CH_SETPOINT_OVERRIDE = 9,
TSP_COUNT = 10,
TSP_COMMAND = 11,
FHB_SIZE = 12,
FHB_COMMAND = 13,
MAX_MODULATION_LEVEL = 14,
MAX_BOILER_CAPACITY = 15, // u8_hb - u8_lb gives min modulation level
ROOM_SETPOINT = 16,
MODULATION_LEVEL = 17,
CH_WATER_PRESSURE = 18,
DHW_FLOW_RATE = 19,
DAY_TIME = 20,
DATE = 21,
YEAR = 22,
ROOM_SETPOINT_CH2 = 23,
ROOM_TEMP = 24,
FEED_TEMP = 25,
DHW_TEMP = 26,
OUTSIDE_TEMP = 27,
RETURN_WATER_TEMP = 28,
SOLAR_STORE_TEMP = 29,
SOLAR_COLLECT_TEMP = 30,
FEED_TEMP_CH2 = 31,
DHW2_TEMP = 32,
EXHAUST_TEMP = 33,
FAN_SPEED = 35,
FLAME_CURRENT = 36,
DHW_BOUNDS = 48,
CH_BOUNDS = 49,
OTC_CURVE_BOUNDS = 50,
DHW_SETPOINT = 56,
MAX_CH_SETPOINT = 57,
OTC_CURVE_RATIO = 58,
// HVAC Specific Message IDs
HVAC_STATUS = 70,
REL_VENT_SETPOINT = 71,
DEVICE_VENT = 74,
REL_VENTILATION = 77,
REL_HUMID_EXHAUST = 78,
SUPPLY_INLET_TEMP = 80,
SUPPLY_OUTLET_TEMP = 81,
EXHAUST_INLET_TEMP = 82,
EXHAUST_OUTLET_TEMP = 83,
NOM_REL_VENTILATION = 87,
OVERRIDE_FUNC = 100,
OEM_DIAGNOSTIC = 115,
BURNER_STARTS = 116,
CH_PUMP_STARTS = 117,
DHW_PUMP_STARTS = 118,
DHW_BURNER_STARTS = 119,
BURNER_HOURS = 120,
CH_PUMP_HOURS = 121,
DHW_PUMP_HOURS = 122,
DHW_BURNER_HOURS = 123,
OT_VERSION_CONTROLLER = 124,
OT_VERSION_DEVICE = 125,
VERSION_CONTROLLER = 126,
VERSION_DEVICE = 127
};
enum BitPositions { STOP_BIT = 33 };
/**
* Structure to hold Opentherm data packet content.
* Use f88(), u16() or s16() functions to get appropriate value of data packet accoridng to id of message.
*/
struct OpenthermData {
uint8_t type;
uint8_t id;
uint8_t valueHB;
uint8_t valueLB;
OpenthermData() : type(0), id(0), valueHB(0), valueLB(0) {}
/**
* @return float representation of data packet value
*/
float f88();
/**
* @param float number to set as value of this data packet
*/
void f88(float value);
/**
* @return unsigned 16b integer representation of data packet value
*/
uint16_t u16();
/**
* @param unsigned 16b integer number to set as value of this data packet
*/
void u16(uint16_t value);
/**
* @return signed 16b integer representation of data packet value
*/
int16_t s16();
/**
* @param signed 16b integer number to set as value of this data packet
*/
void s16(int16_t value);
};
struct OpenThermError {
ProtocolErrorType error_type;
uint32_t capture;
uint8_t clock;
uint32_t data;
uint8_t bit_pos;
};
/**
* Opentherm static class that supports either listening or sending Opentherm data packets in the same time
*/
class OpenTherm {
public:
OpenTherm(InternalGPIOPin *in_pin, InternalGPIOPin *out_pin, int32_t device_timeout = 800);
/**
* Setup pins.
*/
bool initialize();
/**
* Start listening for Opentherm data packet comming from line connected to given pin.
* If data packet is received then has_message() function returns true and data packet can be retrieved by calling
* get_message() function. If timeout > 0 then this function waits for incomming data package for timeout millis and
* if no data packet is recevived, error state is indicated by is_error() function. If either data packet is received
* or timeout is reached listening is stopped.
*/
void listen();
/**
* Use this function to check whether listen() function already captured a valid data packet.
*
* @return true if data packet has been captured from line by listen() function.
*/
bool has_message() { return mode_ == OperationMode::RECEIVED; }
/**
* Use this to retrive data packed captured by listen() function. Data packet is ready when has_message() function
* returns true. This function can be called multiple times until stop() is called.
*
* @param data reference to data structure to which fill the data packet data.
* @return true if packet was ready and was filled into data structure passed, false otherwise.
*/
bool get_message(OpenthermData &data);
/**
* Immediately send out Opentherm data packet to line connected on given pin.
* Completed data transfer is indicated by is_sent() function.
* Error state is indicated by is_error() function.
*
* @param data Opentherm data packet.
*/
void send(OpenthermData &data);
/**
* Stops listening for data packet or sending out data packet and resets internal state of this class.
* Stops all timers and unattaches all interrupts.
*/
void stop();
/**
* Get protocol error details in case a protocol error occured.
* @param error reference to data structure to which fill the error details
* @return true if protocol error occured during last conversation, false otherwise.
*/
bool get_protocol_error(OpenThermError &error);
/**
* Use this function to check whether send() function already finished sending data packed to line.
*
* @return true if data packet has been sent, false otherwise.
*/
bool is_sent() { return mode_ == OperationMode::SENT; }
/**
* Indicates whether listinig or sending is not in progress.
* That also means that no timers are running and no interrupts are attached.
*
* @return true if listening nor sending is in progress.
*/
bool is_idle() { return mode_ == OperationMode::IDLE; }
/**
* Indicates whether last listen() or send() operation ends up with an error. Includes both timeout and
* protocol errors.
*
* @return true if last listen() or send() operation ends up with an error.
*/
bool is_error() { return mode_ == OperationMode::ERROR_TIMEOUT || mode_ == OperationMode::ERROR_PROTOCOL; }
/**
* Indicates whether last listen() or send() operation ends up with a *timeout* error
* @return true if last listen() or send() operation ends up with a *timeout* error.
*/
bool is_timeout() { return mode_ == OperationMode::ERROR_TIMEOUT; }
/**
* Indicates whether last listen() or send() operation ends up with a *protocol* error
* @return true if last listen() or send() operation ends up with a *protocol* error.
*/
bool is_protocol_error() { return mode_ == OperationMode::ERROR_PROTOCOL; }
bool is_active() { return mode_ == LISTEN || mode_ == READ || mode_ == WRITE; }
OperationMode get_mode() { return mode_; }
std::string debug_data(OpenthermData &data);
std::string debug_error(OpenThermError &error);
const char *protocol_error_to_to_str(ProtocolErrorType error_type);
const char *message_type_to_str(MessageType message_type);
const char *operation_mode_to_str(OperationMode mode);
const char *message_id_to_str(MessageId id);
static bool timer_isr(OpenTherm *arg);
#ifdef ESP8266
static void esp8266_timer_isr();
#endif
private:
InternalGPIOPin *in_pin_;
InternalGPIOPin *out_pin_;
ISRInternalGPIOPin isr_in_pin_;
ISRInternalGPIOPin isr_out_pin_;
#if defined(ESP32) || defined(USE_ESP_IDF)
timer_group_t timer_group_;
timer_idx_t timer_idx_;
#endif
OperationMode mode_;
ProtocolErrorType error_type_;
uint32_t capture_;
uint8_t clock_;
uint32_t data_;
uint8_t bit_pos_;
int32_t timeout_counter_; // <0 no timeout
int32_t device_timeout_;
#if defined(ESP32) || defined(USE_ESP_IDF)
bool init_esp32_timer_();
void start_esp32_timer_(uint64_t alarm_value);
#endif
void stop_timer_();
void read_(); // data detected start reading
void start_read_timer_(); // reading timer_ to sample at 1/5 of manchester code bit length (at 5kHz)
void start_write_timer_(); // writing timer_ to send manchester code (at 2kHz)
bool check_parity_(uint32_t val);
void bit_read_(uint8_t value);
ProtocolErrorType verify_stop_bit_(uint8_t value);
void write_bit_(uint8_t high, uint8_t clock);
#ifdef ESP8266
// ESP8266 timer can accept callback with no parameters, so we have this hack to save a static instance of OpenTherm
static OpenTherm *instance_;
#endif
};
} // namespace opentherm
} // namespace esphome

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opentherm:
in_pin: 1
out_pin: 2

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<<: !include common.yaml

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<<: !include common.yaml

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<<: !include common.yaml

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<<: !include common.yaml

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<<: !include common.yaml