From 640647ec5c60f6f591e2c4a3c2938d72f331742f Mon Sep 17 00:00:00 2001
From: Kai Chappell <git@kschappell.com>
Date: Tue, 2 Dec 2025 22:49:30 +0000
Subject: [PATCH] Add configuration Pydantic models

---
 src/py_dvt_ate/app/config.py | 119 +++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/py_dvt_ate/app/config.py

diff --git a/src/py_dvt_ate/app/config.py b/src/py_dvt_ate/app/config.py
new file mode 100644
index 0000000..007a21f
--- /dev/null
+++ b/src/py_dvt_ate/app/config.py
@@ -0,0 +1,119 @@
+"""Configuration models for py_dvt_ate.
+
+This module defines Pydantic models for all configuration sections.
+Configuration can be loaded from YAML files and validated at runtime.
+"""
+
+from typing import Literal
+
+from pydantic import BaseModel, Field
+
+
+class SimulatorConfig(BaseModel):
+    """Configuration for simulator instrument backend."""
+
+    host: str = "localhost"
+    thermal_chamber_port: int = 5001
+    power_supply_port: int = 5002
+    multimeter_port: int = 5003
+
+
+class PyVISAConfig(BaseModel):
+    """Configuration for PyVISA instrument backend."""
+
+    thermal_chamber: str | None = None
+    power_supply: str | None = None
+    multimeter: str | None = None
+
+
+class InstrumentsConfig(BaseModel):
+    """Instrument backend configuration."""
+
+    backend: Literal["simulator", "pyvisa"] = "simulator"
+    simulator: SimulatorConfig = Field(default_factory=SimulatorConfig)
+    pyvisa: PyVISAConfig = Field(default_factory=PyVISAConfig)
+
+
+class ThermalConfig(BaseModel):
+    """Thermal physics parameters."""
+
+    chamber_time_constant_s: float = 30.0
+    case_time_constant_s: float = 5.0
+    theta_jc: float = 15.0  # °C/W (junction to case)
+    theta_ca: float = 5.0  # °C/W (case to ambient)
+
+
+class ChamberConfig(BaseModel):
+    """Thermal chamber behaviour parameters."""
+
+    ramp_rate_c_per_min: float = 10.0
+    stability_window_c: float = 0.5
+    stability_time_s: float = 30.0
+
+
+class PhysicsConfig(BaseModel):
+    """Physics simulation parameters."""
+
+    update_rate_hz: float = 100.0
+    thermal: ThermalConfig = Field(default_factory=ThermalConfig)
+    chamber: ChamberConfig = Field(default_factory=ChamberConfig)
+
+
+class DUTParameters(BaseModel):
+    """DUT model parameters."""
+
+    nominal_output_voltage: float = 3.3
+    tempco_ppm_per_c: float = 50.0
+    quiescent_current_ua: float = 50.0
+    quiescent_current_tempco: float = 0.003
+    dropout_voltage: float = 0.3
+
+
+class DUTConfig(BaseModel):
+    """DUT model configuration."""
+
+    model: str = "ldo"
+    parameters: DUTParameters = Field(default_factory=DUTParameters)
+
+
+class DataConfig(BaseModel):
+    """Data storage paths."""
+
+    database_path: str = "./data/py_dvt_ate.db"
+    measurements_dir: str = "./data/measurements"
+    reports_dir: str = "./data/reports"
+
+
+class LoggingConfig(BaseModel):
+    """Logging configuration."""
+
+    level: str = "INFO"
+    file: str = "./data/logs/py_dvt_ate.log"
+    format: str = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+
+
+class DashboardConfig(BaseModel):
+    """Dashboard (Streamlit) configuration."""
+
+    enabled: bool = True
+    port: int = 8501
+
+
+class APIConfig(BaseModel):
+    """API server configuration (Phase 2)."""
+
+    enabled: bool = False
+    host: str = "0.0.0.0"
+    port: int = 8000
+
+
+class AppConfig(BaseModel):
+    """Root configuration model."""
+
+    instruments: InstrumentsConfig = Field(default_factory=InstrumentsConfig)
+    physics: PhysicsConfig = Field(default_factory=PhysicsConfig)
+    dut: DUTConfig = Field(default_factory=DUTConfig)
+    data: DataConfig = Field(default_factory=DataConfig)
+    logging: LoggingConfig = Field(default_factory=LoggingConfig)
+    dashboard: DashboardConfig = Field(default_factory=DashboardConfig)
+    api: APIConfig = Field(default_factory=APIConfig)