Update __init__.py

components/TCA6408/__init__.py

@@ -3,30 +3,49 @@ import esphome.config_validation as cv
 from esphome.components import i2c, gpio
 from esphome.const import CONF_ID, CONF_ADDRESS, CONF_INTERRUPT_PIN
 
+# This component depends on the I2C bus
 DEPENDENCIES = ["i2c"]
 
+# Namespace for the C++ component
 tca6408_ns = cg.esphome_ns.namespace("tca6408")
+
+# Reference to the main C++ class
 TCA6408Component = tca6408_ns.class_("TCA6408Component", cg.Component, i2c.I2CDevice)
 
+# Configuration schema for the component
 CONFIG_SCHEMA = (
     cv.Schema(
         {
+            # Unique ID for this component instance
             cv.GenerateID(): cv.declare_id(TCA6408Component),
+            
+            # I²C address of the TCA6408 (default 0x20 when ADDR pins are grounded)
             cv.Optional(CONF_ADDRESS, default=0x20): cv.i2c_address,
+            
+            # Optional ESP GPIO connected to the TCA6408 INT pin (recommended)
             cv.Optional(CONF_INTERRUPT_PIN): gpio.validate_gpio_pin("internal"),
         }
     )
-    .extend(cv.COMPONENT_SCHEMA)
-    .extend(i2c.i2c_device_schema())
+    .extend(cv.COMPONENT_SCHEMA)           # Standard ESPHome component settings
+    .extend(i2c.i2c_device_schema())       # I²C device configuration (SDA/SCL)
 )
 
 async def to_code(config):
+    """Generate C++ code from the YAML configuration"""
+    
+    # Create a new instance of the C++ component
     var = cg.new_Pvariable(config[CONF_ID])
+    
+    # Register as a standard ESPHome component
     await cg.register_component(var, config)
+    
+    # Register as an I²C device
     await i2c.register_i2c_device(var, config)
 
+    # Set the I²C address
     cg.add(var.set_address(config[CONF_ADDRESS]))
 
+    # Configure interrupt pin if specified in YAML
     if CONF_INTERRUPT_PIN in config:
         pin = await gpio.register_gpio_pin(var, config[CONF_INTERRUPT_PIN])
         cg.add(var.set_interrupt_pin(pin))