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"""
devices/base_device.py
Abstract base class for all DAQ I/O modules.
Every device plugin must subclass BaseDevice and implement the required methods.
"""
from abc import ABC, abstractmethod
from dataclasses import dataclass, field
from typing import Any, Dict, List, Optional
from enum import Enum
class DeviceStatus(Enum):
DISCONNECTED = "disconnected"
CONNECTING = "connecting"
CONNECTED = "connected"
ERROR = "error"
SIMULATED = "simulated"
@dataclass
class ChannelConfig:
"""Configuration for a single I/O channel."""
channel_id: str
name: str
unit: str = ""
min_value: float = 0.0
max_value: float = 100.0
enabled: bool = True
is_output: bool = False
color: str = "#00d4ff"
writable: bool = False # True if this channel accepts write_channel() calls
extra: Dict[str, Any] = field(default_factory=dict)
@dataclass
class DeviceInfo:
"""Metadata describing a device module."""
device_id: str
name: str
device_type: str # "analog_input" | "digital_io" | "serial" | "temperature"
description: str = ""
manufacturer: str = ""
model: str = ""
version: str = "1.0.0"
icon: str = "⚙"
channels: List[ChannelConfig] = field(default_factory=list)
class BaseDevice(ABC):
"""
Abstract base for all DAQ device plugins.
To create a new module:
1. Subclass BaseDevice
2. Implement all @abstractmethod methods
3. Drop the file in devices/ — DeviceRegistry auto-discovers it
"""
def __init__(self, device_info: DeviceInfo):
self.info = device_info
self.status = DeviceStatus.DISCONNECTED
self._callbacks: List[Any] = []
# ── Required interface ──────────────────────────────────────────────
@abstractmethod
def connect(self) -> bool:
"""Open connection. Returns True on success."""
@abstractmethod
def disconnect(self) -> None:
"""Close connection and release resources."""
@abstractmethod
def read_channels(self) -> Dict[str, float]:
"""Return {channel_id: value} for all enabled channels."""
@abstractmethod
def write_channel(self, channel_id: str, value: Any) -> bool:
"""Write value to an output channel. Returns True on success."""
@abstractmethod
def get_config_widget(self):
"""Return a QWidget with device-specific configuration controls."""
# ── Shared helpers ──────────────────────────────────────────────────
def add_data_callback(self, cb) -> None:
self._callbacks.append(cb)
def _emit(self, channel_id: str, value: float, timestamp: float) -> None:
for cb in self._callbacks:
try:
cb(self.info.device_id, channel_id, value, timestamp)
except Exception:
pass
def get_channel(self, channel_id: str) -> Optional[ChannelConfig]:
return next((c for c in self.info.channels if c.channel_id == channel_id), None)
def __repr__(self):
return f"<{self.__class__.__name__} id={self.info.device_id} status={self.status.value}>"
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