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Add support for acting as Modbus server (#4874)
Co-authored-by: Jeroen van Oort <jeroen.vanoort@webparking.nl> Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
parent
76abf2200c
commit
1ca7c2d7dd
@ -1,5 +1,9 @@
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from __future__ import annotations
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from typing import Literal
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import esphome.codegen as cg
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import esphome.config_validation as cv
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import esphome.final_validate as fv
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from esphome.cpp_helpers import gpio_pin_expression
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from esphome.components import uart
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from esphome.const import (
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@ -17,13 +21,21 @@ Modbus = modbus_ns.class_("Modbus", cg.Component, uart.UARTDevice)
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ModbusDevice = modbus_ns.class_("ModbusDevice")
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MULTI_CONF = True
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CONF_ROLE = "role"
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CONF_MODBUS_ID = "modbus_id"
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CONF_SEND_WAIT_TIME = "send_wait_time"
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ModbusRole = modbus_ns.enum("ModbusRole")
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MODBUS_ROLES = {
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"client": ModbusRole.CLIENT,
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"server": ModbusRole.SERVER,
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}
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CONFIG_SCHEMA = (
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cv.Schema(
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{
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cv.GenerateID(): cv.declare_id(Modbus),
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cv.Optional(CONF_ROLE, default="client"): cv.enum(MODBUS_ROLES),
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cv.Optional(CONF_FLOW_CONTROL_PIN): pins.gpio_output_pin_schema,
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cv.Optional(
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CONF_SEND_WAIT_TIME, default="250ms"
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@ -43,6 +55,7 @@ async def to_code(config):
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await uart.register_uart_device(var, config)
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cg.add(var.set_role(config[CONF_ROLE]))
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if CONF_FLOW_CONTROL_PIN in config:
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pin = await gpio_pin_expression(config[CONF_FLOW_CONTROL_PIN])
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cg.add(var.set_flow_control_pin(pin))
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@ -62,6 +75,28 @@ def modbus_device_schema(default_address):
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return cv.Schema(schema)
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def final_validate_modbus_device(
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name: str, *, role: Literal["server", "client"] | None = None
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):
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def validate_role(value):
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assert role in MODBUS_ROLES
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if value != role:
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raise cv.Invalid(f"Component {name} requires role to be {role}")
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return value
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def validate_hub(hub_config):
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hub_schema = {}
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if role is not None:
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hub_schema[cv.Required(CONF_ROLE)] = validate_role
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return cv.Schema(hub_schema, extra=cv.ALLOW_EXTRA)(hub_config)
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return cv.Schema(
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{cv.Required(CONF_MODBUS_ID): fv.id_declaration_match_schema(validate_hub)},
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extra=cv.ALLOW_EXTRA,
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)
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async def register_modbus_device(var, config):
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parent = await cg.get_variable(config[CONF_MODBUS_ID])
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cg.add(var.set_parent(parent))
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@ -77,7 +77,13 @@ bool Modbus::parse_modbus_byte_(uint8_t byte) {
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ESP_LOGD(TAG, "Modbus user-defined function %02X found", function_code);
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} else {
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// the response for write command mirrors the requests and data startes at offset 2 instead of 3 for read commands
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// data starts at 2 and length is 4 for read registers commands
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if (this->role == ModbusRole::SERVER && (function_code == 0x3 || function_code == 0x4)) {
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data_offset = 2;
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data_len = 4;
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}
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// the response for write command mirrors the requests and data starts at offset 2 instead of 3 for read commands
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if (function_code == 0x5 || function_code == 0x06 || function_code == 0xF || function_code == 0x10) {
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data_offset = 2;
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data_len = 4;
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@ -123,6 +129,9 @@ bool Modbus::parse_modbus_byte_(uint8_t byte) {
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// Ignore modbus exception not related to a pending command
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ESP_LOGD(TAG, "Ignoring Modbus error - not expecting a response");
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}
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} else if (this->role == ModbusRole::SERVER && (function_code == 0x3 || function_code == 0x4)) {
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device->on_modbus_read_registers(function_code, uint16_t(data[1]) | (uint16_t(data[0]) << 8),
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uint16_t(data[3]) | (uint16_t(data[2]) << 8));
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} else {
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device->on_modbus_data(data);
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}
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@ -164,16 +173,18 @@ void Modbus::send(uint8_t address, uint8_t function_code, uint16_t start_address
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std::vector<uint8_t> data;
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data.push_back(address);
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data.push_back(function_code);
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data.push_back(start_address >> 8);
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data.push_back(start_address >> 0);
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if (function_code != 0x5 && function_code != 0x6) {
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data.push_back(number_of_entities >> 8);
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data.push_back(number_of_entities >> 0);
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if (this->role == ModbusRole::CLIENT) {
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data.push_back(start_address >> 8);
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data.push_back(start_address >> 0);
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if (function_code != 0x5 && function_code != 0x6) {
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data.push_back(number_of_entities >> 8);
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data.push_back(number_of_entities >> 0);
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}
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}
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if (payload != nullptr) {
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if (function_code == 0xF || function_code == 0x10) { // Write multiple
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data.push_back(payload_len); // Byte count is required for write
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if (this->role == ModbusRole::SERVER || function_code == 0xF || function_code == 0x10) { // Write multiple
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data.push_back(payload_len); // Byte count is required for write
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} else {
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payload_len = 2; // Write single register or coil
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}
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@ -8,6 +8,11 @@
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namespace esphome {
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namespace modbus {
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enum ModbusRole {
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CLIENT,
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SERVER,
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};
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class ModbusDevice;
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class Modbus : public uart::UARTDevice, public Component {
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@ -27,11 +32,14 @@ class Modbus : public uart::UARTDevice, public Component {
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void send(uint8_t address, uint8_t function_code, uint16_t start_address, uint16_t number_of_entities,
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uint8_t payload_len = 0, const uint8_t *payload = nullptr);
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void send_raw(const std::vector<uint8_t> &payload);
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void set_role(ModbusRole role) { this->role = role; }
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void set_flow_control_pin(GPIOPin *flow_control_pin) { this->flow_control_pin_ = flow_control_pin; }
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uint8_t waiting_for_response{0};
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void set_send_wait_time(uint16_t time_in_ms) { send_wait_time_ = time_in_ms; }
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void set_disable_crc(bool disable_crc) { disable_crc_ = disable_crc; }
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ModbusRole role;
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protected:
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GPIOPin *flow_control_pin_{nullptr};
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@ -50,6 +58,7 @@ class ModbusDevice {
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void set_address(uint8_t address) { address_ = address; }
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virtual void on_modbus_data(const std::vector<uint8_t> &data) = 0;
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virtual void on_modbus_error(uint8_t function_code, uint8_t exception_code) {}
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virtual void on_modbus_read_registers(uint8_t function_code, uint16_t start_address, uint16_t number_of_registers){};
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void send(uint8_t function, uint16_t start_address, uint16_t number_of_entities, uint8_t payload_len = 0,
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const uint8_t *payload = nullptr) {
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this->parent_->send(this->address_, function, start_address, number_of_entities, payload_len, payload);
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@ -23,6 +23,8 @@ CODEOWNERS = ["@martgras"]
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AUTO_LOAD = ["modbus"]
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CONF_READ_LAMBDA = "read_lambda"
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CONF_SERVER_REGISTERS = "server_registers"
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MULTI_CONF = True
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modbus_controller_ns = cg.esphome_ns.namespace("modbus_controller")
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@ -31,6 +33,7 @@ ModbusController = modbus_controller_ns.class_(
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)
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SensorItem = modbus_controller_ns.struct("SensorItem")
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ServerRegister = modbus_controller_ns.struct("ServerRegister")
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ModbusFunctionCode_ns = modbus_controller_ns.namespace("ModbusFunctionCode")
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ModbusFunctionCode = ModbusFunctionCode_ns.enum("ModbusFunctionCode")
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@ -94,10 +97,18 @@ TYPE_REGISTER_MAP = {
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"FP32_R": 2,
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}
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MULTI_CONF = True
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_LOGGER = logging.getLogger(__name__)
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ModbusServerRegisterSchema = cv.Schema(
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{
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cv.GenerateID(): cv.declare_id(ServerRegister),
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cv.Required(CONF_ADDRESS): cv.positive_int,
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cv.Optional(CONF_VALUE_TYPE, default="U_WORD"): cv.enum(SENSOR_VALUE_TYPE),
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cv.Required(CONF_READ_LAMBDA): cv.returning_lambda,
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}
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)
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CONFIG_SCHEMA = cv.All(
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cv.Schema(
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{
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@ -106,6 +117,9 @@ CONFIG_SCHEMA = cv.All(
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CONF_COMMAND_THROTTLE, default="0ms"
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): cv.positive_time_period_milliseconds,
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cv.Optional(CONF_OFFLINE_SKIP_UPDATES, default=0): cv.positive_int,
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cv.Optional(
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CONF_SERVER_REGISTERS,
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): cv.ensure_list(ModbusServerRegisterSchema),
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}
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)
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.extend(cv.polling_component_schema("60s"))
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@ -154,6 +168,17 @@ def validate_modbus_register(config):
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return config
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def _final_validate(config):
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if CONF_SERVER_REGISTERS in config:
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return modbus.final_validate_modbus_device("modbus_controller", role="server")(
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config
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)
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return config
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FINAL_VALIDATE_SCHEMA = _final_validate
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def modbus_calc_properties(config):
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byte_offset = 0
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reg_count = 0
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@ -183,7 +208,7 @@ def modbus_calc_properties(config):
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async def add_modbus_base_properties(
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var, config, sensor_type, lamdba_param_type=cg.float_, lamdba_return_type=float
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var, config, sensor_type, lambda_param_type=cg.float_, lambda_return_type=float
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):
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if CONF_CUSTOM_COMMAND in config:
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cg.add(var.set_custom_data(config[CONF_CUSTOM_COMMAND]))
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@ -196,13 +221,13 @@ async def add_modbus_base_properties(
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config[CONF_LAMBDA],
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[
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(sensor_type.operator("ptr"), "item"),
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(lamdba_param_type, "x"),
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(lambda_param_type, "x"),
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(
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cg.std_vector.template(cg.uint8).operator("const").operator("ref"),
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"data",
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),
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],
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return_type=cg.optional.template(lamdba_return_type),
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return_type=cg.optional.template(lambda_return_type),
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)
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cg.add(var.set_template(template_))
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@ -211,6 +236,23 @@ async def to_code(config):
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var = cg.new_Pvariable(config[CONF_ID])
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cg.add(var.set_command_throttle(config[CONF_COMMAND_THROTTLE]))
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cg.add(var.set_offline_skip_updates(config[CONF_OFFLINE_SKIP_UPDATES]))
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if CONF_SERVER_REGISTERS in config:
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for server_register in config[CONF_SERVER_REGISTERS]:
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cg.add(
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var.add_server_register(
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cg.new_Pvariable(
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server_register[CONF_ID],
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server_register[CONF_ADDRESS],
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server_register[CONF_VALUE_TYPE],
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TYPE_REGISTER_MAP[server_register[CONF_VALUE_TYPE]],
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await cg.process_lambda(
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server_register[CONF_READ_LAMBDA],
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[],
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return_type=cg.float_,
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),
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)
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)
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)
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await register_modbus_device(var, config)
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@ -7,10 +7,7 @@ namespace modbus_controller {
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static const char *const TAG = "modbus_controller";
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void ModbusController::setup() {
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// Modbus::setup();
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this->create_register_ranges_();
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}
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void ModbusController::setup() { this->create_register_ranges_(); }
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/*
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To work with the existing modbus class and avoid polling for responses a command queue is used.
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@ -102,6 +99,51 @@ void ModbusController::on_modbus_error(uint8_t function_code, uint8_t exception_
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}
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}
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void ModbusController::on_modbus_read_registers(uint8_t function_code, uint16_t start_address,
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uint16_t number_of_registers) {
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ESP_LOGD(TAG,
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"Received read holding/input registers for device 0x%X. FC: 0x%X. Start address: 0x%X. Number of registers: "
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"0x%X.",
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this->address_, function_code, start_address, number_of_registers);
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std::vector<uint16_t> sixteen_bit_response;
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for (uint16_t current_address = start_address; current_address < start_address + number_of_registers;) {
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bool found = false;
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for (auto *server_register : this->server_registers_) {
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if (server_register->address == current_address) {
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float value = server_register->read_lambda();
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ESP_LOGD(TAG, "Matched register. Address: 0x%02X. Value type: %zu. Register count: %u. Value: %0.1f.",
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server_register->address, static_cast<uint8_t>(server_register->value_type),
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server_register->register_count, value);
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number_to_payload(sixteen_bit_response, value, server_register->value_type);
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current_address += server_register->register_count;
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found = true;
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break;
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}
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}
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if (!found) {
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ESP_LOGW(TAG, "Could not match any register to address %02X. Sending exception response.", current_address);
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std::vector<uint8_t> error_response;
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error_response.push_back(this->address_);
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error_response.push_back(0x81);
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error_response.push_back(0x02);
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this->send_raw(error_response);
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return;
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}
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}
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std::vector<uint8_t> response;
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for (auto v : sixteen_bit_response) {
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auto decoded_value = decode_value(v);
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response.push_back(decoded_value[0]);
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response.push_back(decoded_value[1]);
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}
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this->send(function_code, start_address, number_of_registers, response.size(), response.data());
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}
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SensorSet ModbusController::find_sensors_(ModbusRegisterType register_type, uint16_t start_address) const {
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auto reg_it = find_if(begin(register_ranges_), end(register_ranges_), [=](RegisterRange const &r) {
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return (r.start_address == start_address && r.register_type == register_type);
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@ -190,7 +232,7 @@ void ModbusController::update() {
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// walk through the sensors and determine the register ranges to read
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size_t ModbusController::create_register_ranges_() {
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register_ranges_.clear();
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if (sensorset_.empty()) {
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if (this->parent_->role == modbus::ModbusRole::CLIENT && sensorset_.empty()) {
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ESP_LOGW(TAG, "No sensors registered");
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return 0;
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}
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@ -309,6 +351,11 @@ void ModbusController::dump_config() {
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ESP_LOGCONFIG(TAG, " Range type=%zu start=0x%X count=%d skip_updates=%d", static_cast<uint8_t>(it.register_type),
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it.start_address, it.register_count, it.skip_updates);
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}
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ESP_LOGCONFIG(TAG, "server registers");
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for (auto &r : server_registers_) {
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ESP_LOGCONFIG(TAG, " Address=0x%02X value_type=%zu register_count=%u", r->address,
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static_cast<uint8_t>(r->value_type), r->register_count);
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}
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#endif
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}
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@ -8,6 +8,7 @@
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#include <list>
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#include <queue>
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#include <set>
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#include <utility>
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#include <vector>
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namespace esphome {
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@ -251,6 +252,21 @@ class SensorItem {
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bool force_new_range{false};
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};
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class ServerRegister {
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public:
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ServerRegister(uint16_t address, SensorValueType value_type, uint8_t register_count,
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std::function<float()> read_lambda) {
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this->address = address;
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this->value_type = value_type;
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this->register_count = register_count;
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this->read_lambda = std::move(read_lambda);
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}
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uint16_t address;
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SensorValueType value_type;
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uint8_t register_count;
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std::function<float()> read_lambda;
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};
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// ModbusController::create_register_ranges_ tries to optimize register range
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// for this the sensors must be ordered by register_type, start_address and bitmask
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class SensorItemsComparator {
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@ -418,10 +434,14 @@ class ModbusController : public PollingComponent, public modbus::ModbusDevice {
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void queue_command(const ModbusCommandItem &command);
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/// Registers a sensor with the controller. Called by esphomes code generator
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void add_sensor_item(SensorItem *item) { sensorset_.insert(item); }
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/// Registers a server register with the controller. Called by esphomes code generator
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void add_server_register(ServerRegister *server_register) { server_registers_.push_back(server_register); }
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/// called when a modbus response was parsed without errors
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void on_modbus_data(const std::vector<uint8_t> &data) override;
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/// called when a modbus error response was received
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void on_modbus_error(uint8_t function_code, uint8_t exception_code) override;
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/// called when a modbus request (function code 3 or 4) was parsed without errors
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void on_modbus_read_registers(uint8_t function_code, uint16_t start_address, uint16_t number_of_registers) final;
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/// default delegate called by process_modbus_data when a response has retrieved from the incoming queue
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void on_register_data(ModbusRegisterType register_type, uint16_t start_address, const std::vector<uint8_t> &data);
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/// default delegate called by process_modbus_data when a response for a write response has retrieved from the
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@ -452,6 +472,8 @@ class ModbusController : public PollingComponent, public modbus::ModbusDevice {
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void dump_sensors_();
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/// Collection of all sensors for this component
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SensorSet sensorset_;
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/// Collection of all server registers for this component
|
||||
std::vector<ServerRegister *> server_registers_;
|
||||
/// Continuous range of modbus registers
|
||||
std::vector<RegisterRange> register_ranges_;
|
||||
/// Hold the pending requests to be sent
|
||||
|
@ -1,14 +1,30 @@
|
||||
uart:
|
||||
- id: uart_modbus
|
||||
- id: uart_modbus_client
|
||||
tx_pin: 17
|
||||
rx_pin: 16
|
||||
baud_rate: 9600
|
||||
- id: uart_modbus_server
|
||||
tx_pin: 1
|
||||
rx_pin: 3
|
||||
baud_rate: 9600
|
||||
|
||||
modbus:
|
||||
id: mod_bus1
|
||||
flow_control_pin: 15
|
||||
- id: mod_bus1
|
||||
uart_id: uart_modbus_client
|
||||
flow_control_pin: 15
|
||||
- id: mod_bus2
|
||||
uart_id: uart_modbus_server
|
||||
role: server
|
||||
|
||||
modbus_controller:
|
||||
- id: modbus_controller1
|
||||
address: 0x2
|
||||
modbus_id: mod_bus1
|
||||
- id: modbus_controller2
|
||||
address: 0x2
|
||||
modbus_id: mod_bus2
|
||||
server_registers:
|
||||
- address: 0x0000
|
||||
value_type: S_DWORD_R
|
||||
read_lambda: |-
|
||||
return 42.3;
|
||||
|
Loading…
Reference in New Issue
Block a user