jyapayne/switch-pico
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Add hot plugging

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Joey Yakimowich-Payne 2025-11-20 22:50:14 -07:00
commit f73b9f8604
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1 changed files with 111 additions and 31 deletions
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142
mac_controller_uart_bridge.py
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@ -23,6 +23,7 @@ from dataclasses import dataclass, field
from typing import Dict, List, Optional, Tuple
import serial
from serial import SerialException
from serial.tools import list_ports
import sdl2
@ -287,7 +288,7 @@ def apply_rumble(controller: sdl2.SDL_GameController, payload: bytes) -> None:
scale = 0.40
left = int(min(1.0, left_norm * scale) * 0xFFFF)
right = int(min(1.0, right_norm * scale) * 0xFFFF)
duration = 25
duration = 10
sdl2.SDL_GameControllerRumble(controller, left, right, duration)
@ -295,13 +296,14 @@ def apply_rumble(controller: sdl2.SDL_GameController, payload: bytes) -> None:
class ControllerContext:
controller: sdl2.SDL_GameController
instance_id: int
uart: PicoUART
controller_index: int
port: str
uart: Optional[PicoUART]
report: SwitchReport = field(default_factory=SwitchReport)
dpad: Dict[str, bool] = field(default_factory=lambda: {"up": False, "down": False, "left": False, "right": False})
last_trigger_state: Dict[str, bool] = field(default_factory=lambda: {"left": False, "right": False})
last_send: float = 0.0
stop_event: threading.Event = field(default_factory=threading.Event)
rumble_thread: Optional[threading.Thread] = None
last_reopen_attempt: float = 0.0
def open_controller(index: int) -> Tuple[sdl2.SDL_GameController, int]:
@ -313,18 +315,16 @@ def open_controller(index: int) -> Tuple[sdl2.SDL_GameController, int]:
return controller, instance_id
def start_rumble_listener(ctx: ControllerContext) -> threading.Thread:
def _worker() -> None:
while not ctx.stop_event.is_set():
payload = ctx.uart.read_rumble_payload()
if not payload:
time.sleep(0.0005) # small yield to avoid busy-spin
continue
apply_rumble(ctx.controller, payload)
def try_open_uart(port: str, baud: int) -> Optional[PicoUART]:
try:
return PicoUART(port, baud)
except Exception:
return None
thread = threading.Thread(target=_worker, name=f"rumble-{ctx.instance_id}", daemon=True)
thread.start()
return thread
def start_rumble_listener(ctx: ControllerContext) -> threading.Thread:
# No-op placeholder (rumble is polled in the main loop for hotplug safety).
return None
def build_arg_parser() -> argparse.ArgumentParser:
@ -356,6 +356,12 @@ def build_arg_parser() -> argparse.ArgumentParser:
default=0.35,
help="Trigger threshold treated as a digital press (0.0-1.0, default 0.35)",
)
parser.add_argument(
"--baud",
type=int,
default=UART_BAUD,
help=f"UART baud rate (default {UART_BAUD}; must match switch-pico firmware)",
)
return parser
@ -369,6 +375,7 @@ def main() -> None:
sdl2.SDL_Init(sdl2.SDL_INIT_GAMECONTROLLER)
contexts: Dict[int, ControllerContext] = {}
uarts: List[PicoUART] = []
mapping_by_index: Dict[int, str] = {}
console = Console()
try:
controller_indices: List[int] = []
@ -430,15 +437,33 @@ def main() -> None:
console.print(f" Controller {idx} -> {port}")
for index, port in mappings:
controller, instance_id = open_controller(index)
uart = PicoUART(port)
uarts.append(uart)
ctx = ControllerContext(controller=controller, instance_id=instance_id, uart=uart)
ctx.rumble_thread = start_rumble_listener(ctx)
contexts[instance_id] = ctx
console.print(f"[green]Controller {index} ({instance_id}) paired to {port}[/green]")
mapping_by_index[index] = port
if not contexts:
# Open currently connected controllers that match the mapping.
for index, port in mappings:
if index >= sdl2.SDL_NumJoysticks() or not sdl2.SDL_IsGameController(index):
continue
try:
controller, instance_id = open_controller(index)
except Exception as exc:
console.print(f"[red]Failed to open controller {index}: {exc}[/red]")
continue
uart = try_open_uart(port, args.baud)
if uart:
uarts.append(uart)
console.print(f"[green]Controller {index} ({instance_id}) paired to {port}[/green]")
else:
console.print(f"[yellow]Controller {index} ({instance_id}) waiting for UART {port}[/yellow]")
ctx = ControllerContext(
controller=controller,
instance_id=instance_id,
controller_index=index,
port=port,
uart=uart,
)
contexts[instance_id] = ctx
if not contexts and not mapping_by_index:
parser.error("No controllers opened. Check --map/--ports/--interactive values.")
event = sdl2.SDL_Event()
@ -493,19 +518,74 @@ def main() -> None:
elif button in DPAD_BUTTONS:
ctx.dpad[DPAD_BUTTONS[button]] = pressed
ctx.report.hat = dpad_to_hat(ctx.dpad)
elif event.type == sdl2.SDL_CONTROLLERDEVICEADDED:
idx = event.cdevice.which
port = mapping_by_index.get(idx)
if port is None:
continue
# Avoid duplicate opens for already connected instance IDs.
already = any(c.controller_index == idx for c in contexts.values())
if already:
continue
try:
controller, instance_id = open_controller(idx)
except Exception as exc:
console.print(f"[red]Hotplug open failed for controller {idx}: {exc}[/red]")
continue
uart = try_open_uart(port, args.baud)
if uart:
uarts.append(uart)
console.print(f"[green]Controller {idx} ({instance_id}) paired to {port}[/green]")
else:
console.print(f"[yellow]Controller {idx} ({instance_id}) waiting for UART {port}[/yellow]")
ctx = ControllerContext(
controller=controller,
instance_id=instance_id,
controller_index=idx,
port=port,
uart=uart,
)
contexts[instance_id] = ctx
elif event.type == sdl2.SDL_CONTROLLERDEVICEREMOVED:
instance_id = event.cdevice.which
ctx = contexts.pop(instance_id, None)
if ctx:
console.print(f"[yellow]Controller {instance_id} removed[/yellow]")
sdl2.SDL_GameControllerClose(ctx.controller)
now = time.monotonic()
for ctx in contexts.values():
if now - ctx.last_send >= interval:
ctx.uart.send_report(ctx.report)
ctx.last_send = now
for ctx in list(contexts.values()):
# Reconnect UART if needed.
if ctx.uart is None and (now - ctx.last_reopen_attempt) > 1.0:
ctx.last_reopen_attempt = now
uart = try_open_uart(ctx.port, args.baud)
if uart:
uarts.append(uart)
console.print(f"[green]Reconnected UART {ctx.port} for controller {ctx.controller_index}[/green]")
ctx.uart = uart
if ctx.uart is None:
continue
try:
if now - ctx.last_send >= interval:
ctx.uart.send_report(ctx.report)
ctx.last_send = now
# Poll rumble quickly while we have the port.
payload = ctx.uart.read_rumble_payload()
if payload:
apply_rumble(ctx.controller, payload)
except SerialException as exc:
console.print(f"[yellow]UART {ctx.port} disconnected: {exc}[/yellow]")
try:
ctx.uart.close()
except Exception:
pass
ctx.uart = None
ctx.last_reopen_attempt = now
except Exception as exc:
console.print(f"[red]UART error on {ctx.port}: {exc}[/red]")
sdl2.SDL_Delay(1)
finally:
for ctx in contexts.values():
ctx.stop_event.set()
if ctx.rumble_thread:
ctx.rumble_thread.join(timeout=0.2)
sdl2.SDL_GameControllerClose(ctx.controller)
for uart in uarts:
uart.close()