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linux-voice-assistant/linux_voice_assistant/led_controller.py
T
imonlinux 3d7cc49466 Add support for XVF380 LEDs 
Keeps all existing DotStar/NeoPixel behavior intact.

Adds a USB-based XVF3800 backend using the legacy LED controls (LED_EFFECT, LED_BRIGHTNESS, LED_SPEED, LED_COLOR).

Plugs it into LedController by treating "led_type": "xvf3800", "interface": "usb" as a new backend.
2025-12-08 14:06:45 -08:00

560 lines
20 KiB
Python
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import asyncio
import logging
from typing import Any, Optional, Tuple
_LOGGER = logging.getLogger(__name__)
# ---------------------------------------------------------------------------
# Optional hardware imports (board-safe)
# ---------------------------------------------------------------------------
try:
import board # type: ignore[import]
except Exception:
board = None # type: ignore[assignment]
_LOGGER.warning(
"Adafruit 'board' module not available or unsupported on this platform; "
"DotStar/NeoPixel GPIO/SPI LED backends will be disabled. "
"XVF3800 USB LED backend is unaffected."
)
from .config import LedConfig
from .event_bus import EventBus, EventHandler, subscribe
from .models import Preferences
# Default Colors
_OFF = (0, 0, 0)
_BLUE = (0, 0, 255)
_YELLOW = (255, 255, 0)
_GREEN = (0, 255, 0)
_DIM_RED = (50, 0, 0)
_ORANGE = (255, 165, 0)
_PURPLE = (128, 0, 255)
class LedController(EventHandler):
def __init__(
self,
loop: asyncio.AbstractEventLoop,
event_bus: EventBus,
config: LedConfig,
preferences: Preferences,
):
super().__init__(event_bus)
self.loop = loop
self.num_leds = preferences.num_leds # Get num_leds from preferences
self.current_task: Optional[asyncio.Future] = None
self._is_ready = False
self.leds = None
# Backend mode:
# "pixels" -> DotStar / NeoPixel via Adafruit drivers
# "xvf3800" -> XVF3800 USB LED ring backend
self._backend_mode: str = "pixels"
self._xvf3800_backend = None
# Configured LED behavior
self.configs = {
"idle": {"effect": "off", "color": _PURPLE, "brightness": 0.5},
"listening": {"effect": "medium_pulse", "color": _BLUE, "brightness": 0.5},
"thinking": {"effect": "spin", "color": _YELLOW, "brightness": 0.8},
"responding": {"effect": "medium_pulse", "color": _GREEN, "brightness": 0.5},
"error": {"effect": "fast_blink", "color": _ORANGE, "brightness": 1.0},
}
# Determine whether hardware LEDs should be used at all
config_enabled = getattr(config, "enabled", True)
# For XVF3800 we do NOT require the Adafruit 'board' module.
if config.led_type == "xvf3800" and config.interface == "usb":
self._enabled = bool(config_enabled)
else:
self._enabled = bool(config_enabled) and (board is not None)
if not config_enabled:
_LOGGER.info(
"LEDs disabled in config (led.enabled = false); "
"LedController will run in no-op mode."
)
elif not self._enabled:
_LOGGER.warning(
"LED hardware libraries not available on this platform for led_type=%s; "
"LedController will run in no-op mode.",
config.led_type,
)
# Always subscribe to events so MQTT + state logic remains intact,
# even when LEDs are effectively disabled.
self._subscribe_all_methods()
# If LEDs are not enabled at all, skip hardware init
if not self._enabled:
return
# -------------------------------------------------------------------
# XVF3800 USB LED backend
# -------------------------------------------------------------------
if config.led_type == "xvf3800" and config.interface == "usb":
try:
from .xvf3800_led_backend import XVF3800LedBackend # type: ignore[import]
self._xvf3800_backend = XVF3800LedBackend()
self._backend_mode = "xvf3800"
self._is_ready = True
_LOGGER.info(
"LED Controller initialized for XVF3800 USB LED ring (num_leds=%d).",
self.num_leds,
)
self.run_action("startup_sequence")
except Exception:
# Any hardware-related failure leaves us in no-op mode
self._is_ready = False
self._enabled = False
self._xvf3800_backend = None
_LOGGER.exception(
"Failed to initialize XVF3800 LED backend. LEDs will be disabled."
)
return
# -------------------------------------------------------------------
# Hardware initialization (DotStar / NeoPixel via Adafruit drivers)
# -------------------------------------------------------------------
try:
if config.led_type == "neopixel":
if config.interface == "spi":
import busio
import neopixel_spi
_LOGGER.debug(
"Initializing %d NeoPixel LEDs on hardware SPI", self.num_leds
)
spi = busio.SPI(board.SCLK, MOSI=board.MOSI)
self.leds = neopixel_spi.NeoPixel_SPI(
spi, self.num_leds, auto_write=False
)
else: # GPIO
import neopixel
_LOGGER.debug(
"Initializing %d NeoPixel LEDs on GPIO data=%s",
self.num_leds,
config.data_pin,
)
pin_object = getattr(board, f"D{config.data_pin}")
self.leds = neopixel.NeoPixel(
pin_object, self.num_leds, auto_write=False
)
else: # dotstar
import adafruit_dotstar
if config.interface == "gpio":
_LOGGER.debug(
"Initializing %d DotStar LEDs on GPIO data=%s, clock=%s",
self.num_leds,
config.data_pin,
config.clock_pin,
)
data_pin_obj = getattr(board, f"D{config.data_pin}")
clock_pin_obj = getattr(board, f"D{config.clock_pin}")
self.leds = adafruit_dotstar.DotStar(
clock_pin_obj, data_pin_obj, self.num_leds, auto_write=False
)
else: # SPI
_LOGGER.debug(
"Initializing %d DotStar LEDs on hardware SPI", self.num_leds
)
self.leds = adafruit_dotstar.DotStar(
board.SCLK, board.MOSI, self.num_leds, auto_write=False
)
self._backend_mode = "pixels"
self._is_ready = True
_LOGGER.info(
"LED Controller initialized for %d %s LEDs.",
self.num_leds,
config.led_type,
)
self.run_action("startup_sequence")
except Exception:
# Any hardware-related failure leaves us in no-op mode
self._is_ready = False
self.leds = None
_LOGGER.exception(
"Failed to initialize LED controller. LEDs will be disabled."
)
# -----------------------------------------------------------------------
# Internal helpers
# -----------------------------------------------------------------------
def run_action(self, action_method_name: str, *args: Any) -> None:
"""Schedule an LED coroutine on the event loop."""
if not (self._enabled and self._is_ready):
return
if self.current_task and not self.current_task.done():
self.current_task.cancel()
coro = getattr(self, action_method_name)(*args)
self.current_task = asyncio.run_coroutine_threadsafe(coro, self.loop)
def _apply_state_effect(self, state_name: str, publish_state: bool = True):
config = self.configs.get(state_name, self.configs["idle"])
_LOGGER.debug(
"Applying effect for state '%s': %s", state_name, config["effect"]
)
self.run_action(config["effect"], config["color"], config["brightness"])
if publish_state:
config["state_name"] = state_name
self.event_bus.publish("publish_state_to_mqtt", config)
# -----------------------------------------------------------------------
# XVF3800-specific helpers
# -----------------------------------------------------------------------
async def _xvf3800_apply_effect(
self,
effect_name: str,
color: Tuple[int, int, int],
brightness: float,
) -> None:
"""Map generic effect/color/brightness to XVF3800 legacy LED controls."""
if not (self._enabled and self._is_ready and self._xvf3800_backend):
return
# Clamp brightness 0..1 and map to 0..255
brightness = max(0.0, min(1.0, float(brightness)))
brightness_255 = int(brightness * 255)
# Effect mapping to XVF3800 legacy modes
effect_map = {
"off": 0, # LED_EFFECT = off
"solid": 3, # single color
"slow_pulse": 1, # breath
"medium_pulse": 1, # breath
"fast_pulse": 1, # breath
"slow_blink": 1, # approximate with breath
"medium_blink": 1, # approximate with breath
"fast_blink": 1, # approximate with breath
"spin": 2, # rainbow as a stand-in for "spin"
}
speed_map = {
"off": 0,
"solid": 0,
"slow_pulse": 0,
"medium_pulse": 1,
"fast_pulse": 2,
"slow_blink": 0,
"medium_blink": 1,
"fast_blink": 2,
"spin": 1,
}
effect_id = effect_map.get(effect_name, 3)
speed_id = speed_map.get(effect_name, 1)
r, g, b = color
try:
# Apply brightness, color, speed, and effect via USB control transfers.
self._xvf3800_backend.set_brightness(brightness_255)
if effect_name != "off":
self._xvf3800_backend.set_color(r, g, b)
self._xvf3800_backend.set_speed(speed_id)
self._xvf3800_backend.set_effect(effect_id)
except Exception:
_LOGGER.exception(
"Error sending LED effect '%s' to XVF3800 backend", effect_name
)
# Keep coroutine alive until cancelled so that a new effect
# can cancel the previous one consistently.
try:
while True:
await asyncio.sleep(3600)
except asyncio.CancelledError:
return
# -----------------------------------------------------------------------
# LED effect coroutines
# -----------------------------------------------------------------------
async def startup_sequence(self, color=None, brightness=None):
# Use a simple green blink on startup for all backends.
await self.blink(_GREEN, 1.0)
async def off(self, color, brightness):
if not (self._enabled and self._is_ready):
return
if self._backend_mode == "xvf3800":
await self._xvf3800_apply_effect("off", _OFF, 0.0)
return
self.leds.fill(_OFF)
self.leds.show()
async def solid(self, color: Tuple[int, int, int], brightness: float):
if not (self._enabled and self._is_ready):
return
if self._backend_mode == "xvf3800":
await self._xvf3800_apply_effect("solid", color, brightness)
return
r, g, b = color
self.leds.fill(
(int(r * brightness), int(g * brightness), int(b * brightness))
)
self.leds.show()
async def blink(self, color, brightness=1.0):
await self.medium_blink(color, brightness)
async def _base_pulse(
self,
effect_name: str,
color: Tuple[int, int, int],
brightness: float,
speed: float,
):
if not (self._enabled and self._is_ready):
return
if self._backend_mode == "xvf3800":
await self._xvf3800_apply_effect(effect_name, color, brightness)
return
try:
r, g, b = color
while True:
for i in range(0, 101, 10):
mod = i / 100.0 * brightness
self.leds.fill(
(int(r * mod), int(g * mod), int(b * mod))
)
self.leds.show()
await asyncio.sleep(speed)
for i in range(100, -1, -10):
mod = i / 100.0 * brightness
self.leds.fill(
(int(r * mod), int(g * mod), int(b * mod))
)
self.leds.show()
await asyncio.sleep(speed)
except asyncio.CancelledError:
if self._enabled and self._is_ready and self.leds is not None:
self.leds.fill(_OFF)
self.leds.show()
async def slow_pulse(self, color, brightness):
await self._base_pulse("slow_pulse", color, brightness, 0.05)
async def medium_pulse(self, color, brightness):
await self._base_pulse("medium_pulse", color, brightness, 0.02)
async def fast_pulse(self, color, brightness):
await self._base_pulse("fast_pulse", color, brightness, 0.008)
async def _base_blink(
self,
effect_name: str,
color: Tuple[int, int, int],
brightness: float,
speed: float,
):
if not (self._enabled and self._is_ready):
return
if self._backend_mode == "xvf3800":
await self._xvf3800_apply_effect(effect_name, color, brightness)
return
try:
r, g, b = color
bright_color = (
int(r * brightness),
int(g * brightness),
int(b * brightness),
)
while True:
self.leds.fill(bright_color)
self.leds.show()
await asyncio.sleep(speed)
self.leds.fill(_OFF)
self.leds.show()
await asyncio.sleep(speed)
except asyncio.CancelledError:
if self._enabled and self._is_ready and self.leds is not None:
self.leds.fill(_OFF)
self.leds.show()
async def slow_blink(self, color, brightness):
await self._base_blink("slow_blink", color, brightness, 1.0)
async def medium_blink(self, color, brightness):
await self._base_blink("medium_blink", color, brightness, 0.5)
async def fast_blink(self, color, brightness):
await self._base_blink("fast_blink", color, brightness, 0.1)
async def spin(
self, color: Tuple[int, int, int], brightness: float, speed: float = 0.1
):
if not (self._enabled and self._is_ready):
return
if self._backend_mode == "xvf3800":
await self._xvf3800_apply_effect("spin", color, brightness)
return
try:
i = 0
bright_color = (
int(color[0] * brightness),
int(color[1] * brightness),
int(color[2] * brightness),
)
while True:
self.leds.fill(_OFF)
self.leds[i % self.num_leds] = bright_color
self.leds.show()
i += 1
await asyncio.sleep(speed)
except asyncio.CancelledError:
if self._enabled and self._is_ready and self.leds is not None:
self.leds.fill(_OFF)
self.leds.show()
# -----------------------------------------------------------------------
# State Subscriptions
# -----------------------------------------------------------------------
@subscribe
def voice_idle(self, data: dict):
self._apply_state_effect("idle")
@subscribe
def voice_listen(self, data: dict):
self._apply_state_effect("listening")
@subscribe
def voice_thinking(self, data: dict):
self._apply_state_effect("thinking")
@subscribe
def voice_responding(self, data: dict):
self._apply_state_effect("responding")
@subscribe
def voice_error(self, data: dict):
self._apply_state_effect("error")
@subscribe
def mic_muted(self, data: dict):
# When muted, show a solid dim red on all backends.
self.run_action("solid", _DIM_RED, 1.0)
@subscribe
def mic_unmuted(self, data: dict):
self._apply_state_effect("idle")
# -----------------------------------------------------------------------
# MQTT Config Subscriptions
# -----------------------------------------------------------------------
def _update_config(self, state_name: str, data: dict, apply: bool):
config = self.configs[state_name]
changed = False
is_retained = data.get("retained", False)
new_effect = data.get("effect")
if new_effect is not None and config["effect"] != new_effect:
config["effect"] = new_effect
changed = True
new_color_data = data.get("color")
if new_color_data is not None:
new_color_tuple = (
new_color_data.get("r"),
new_color_data.get("g"),
new_color_data.get("b"),
)
if config["color"] != new_color_tuple:
config["color"] = new_color_tuple
changed = True
new_brightness = data.get("brightness")
if new_brightness is not None:
new_brightness_float = new_brightness / 255.0
if abs(config["brightness"] - new_brightness_float) > 0.001:
config["brightness"] = new_brightness_float
changed = True
if is_retained:
if changed and state_name == "idle":
# Re-apply idle but don't republish back to MQTT
self._apply_state_effect("idle", publish_state=False)
return
if changed:
if apply:
self._apply_state_effect(state_name)
else:
config["state_name"] = state_name
self.event_bus.publish("publish_state_to_mqtt", config)
@subscribe
def set_idle_effect(self, data: dict):
self._update_config("idle", data, True)
@subscribe
def set_idle_color(self, data: dict):
self._update_config(
"idle",
data,
self.configs["idle"]["effect"] != "off",
)
@subscribe
def set_listening_effect(self, data: dict):
self._update_config("listening", data, False)
@subscribe
def set_listening_color(self, data: dict):
self._update_config("listening", data, False)
@subscribe
def set_thinking_effect(self, data: dict):
self._update_config("thinking", data, False)
@subscribe
def set_thinking_color(self, data: dict):
self._update_config("thinking", data, False)
@subscribe
def set_responding_effect(self, data: dict):
self._update_config("responding", data, False)
@subscribe
def set_responding_color(self, data: dict):
self._update_config("responding", data, False)
@subscribe
def set_error_effect(self, data: dict):
self._update_config("error", data, False)
@subscribe
def set_error_color(self, data: dict):
self._update_config("error", data, False)
@subscribe
def set_num_leds(self, data: dict):
num_leds = data.get("num_leds")
if (num_leds is not None) and (self.num_leds != num_leds):
_LOGGER.info(
"Number of LEDs changed to %d. Please restart for change to take effect.",
num_leds,
)
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