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user_input.py
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user_input.py
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import time
import microcontroller
from busio import I2C
# noinspection PyBroadException
try:
from typing import List, Optional, Callable, Any
except:
# don't care
pass
from adafruit_seesaw import seesaw, rotaryio
import digitalio
from adafruit_seesaw.digitalio import DigitalIO
class WaitTickListener:
def __init__(self, seconds: int, on_tick: Callable[[float], None], recurring = False, name: Optional[str] = None):
self.seconds = seconds
self.on_tick = on_tick
self.last_triggered = None
self.recurring = recurring
self.name = name
def trigger(self, elapsed: float) -> None:
self.last_triggered = elapsed
self.on_tick(elapsed)
def __str__(self):
return super().__str__() if self.name is None else self.name
class ShutdownRequestListener:
def __init__(self, on_shutdown_requested: Callable[[], None]):
self.on_shutdown_requested = on_shutdown_requested
def trigger(self) -> None:
self.on_shutdown_requested()
class ResetRequestListener:
def __init__(self, on_reset_requested: Callable[[], None]):
self.on_reset_requested = on_reset_requested
def trigger(self) -> None:
self.on_reset_requested()
class ActivityListener:
def __init__(self, on_activity):
self.on_activity = on_activity
def trigger(self) -> None:
self.on_activity()
class Button(DigitalIO):
def __init__(self, seesaw_controller: seesaw.Seesaw, pin: int):
self.pin = pin
success = False
while not success:
try:
super().__init__(seesaw_controller, pin)
self.direction = digitalio.Direction.INPUT
self.pull = digitalio.Pull.UP
success = True
except OSError as e:
print(f"Failed to set up rotary encoder button, trying again: {e}")
time.sleep(0.2)
self.press_start: float = 0
self.is_pressed = False
# a click (down then up), not just down
def was_pressed(self) -> tuple[bool, float]:
if not self.value:
if not self.is_pressed:
self.press_start = time.monotonic()
self.is_pressed = True
return False, time.monotonic() - self.press_start
if self.value and self.is_pressed:
self.is_pressed = False
return True, time.monotonic() - self.press_start
return False, 0
class RotaryEncoder:
SELECT = 1
UP = 3
LEFT = 4
DOWN = 5
RIGHT = 2
CLOCKWISE = 10
COUNTERCLOCKWISE = 11
HOLD_FOR_SHUTDOWN_SECONDS = 3
def __init__(self, i2c: I2C):
self.i2c = i2c
self.on_activity_listeners: List[ActivityListener] = []
self.on_wait_tick_listeners: List[WaitTickListener] = []
self.on_shutdown_requested_listeners: List[ShutdownRequestListener] = []
self.on_reset_requested_listeners: List[ResetRequestListener] = []
self.last_position = None
self.buttons = {}
self.last_button_down = None
self.last_button_down_times = {}
self.seesaw = self.init_seesaw()
self.encoder = self.init_rotary_encoder()
def init_seesaw(self) -> seesaw.Seesaw:
seesaw_controller = seesaw.Seesaw(self.i2c, addr = 0x49)
product_id = (seesaw_controller.get_version() >> 16) & 0xFFFF
assert product_id == 5740
return seesaw_controller
def init_rotary_encoder(self) -> rotaryio.IncrementalEncoder:
# it's physically rotated 90 CW so adjust accordingly
buttons = [
RotaryEncoder.SELECT,
RotaryEncoder.UP,
RotaryEncoder.LEFT,
RotaryEncoder.DOWN,
RotaryEncoder.RIGHT
]
for pin in buttons:
self.buttons[pin] = Button(self.seesaw, pin)
encoder = rotaryio.IncrementalEncoder(self.seesaw)
self.last_position = encoder.position
return encoder
def wait(self,
listen_for_buttons: bool = True,
listen_for_rotation: bool = True,
extra_wait_tick_listeners: list[WaitTickListener] = None
) -> int:
assert(listen_for_buttons or listen_for_rotation)
response = None
if extra_wait_tick_listeners is None:
extra_wait_tick_listeners = []
start = time.monotonic()
while response is None:
response = self.poll_for_input()
self.trigger_applicable_listeners(extra_wait_tick_listeners, start)
for activity_listener in self.on_activity_listeners:
activity_listener.trigger()
for wait_tick_listener in self.on_wait_tick_listeners + extra_wait_tick_listeners:
wait_tick_listener.last_triggered = None # reset for next call of wait()
return response
def trigger_applicable_listeners(self, extra_wait_tick_listeners: List[WaitTickListener], start: float) -> None:
now = time.monotonic()
elapsed = now - start
for listener in self.on_wait_tick_listeners + extra_wait_tick_listeners:
if elapsed > listener.seconds and listener.last_triggered is None:
listener.trigger(elapsed)
listener.last_triggered = now
elif listener.recurring and listener.last_triggered is not None:
last_relative_triggered = now - listener.last_triggered
if last_relative_triggered >= listener.seconds:
listener.trigger(elapsed)
listener.last_triggered = now
def poll_for_input(self, listen_for_buttons: bool = True, listen_for_rotation: bool = True) -> int:
response = None
for key, button in self.buttons.items():
was_pressed, hold_time = button.was_pressed()
if hold_time >= RotaryEncoder.HOLD_FOR_SHUTDOWN_SECONDS:
if button.pin == RotaryEncoder.SELECT and len(self.on_shutdown_requested_listeners) > 0:
print("Informing listeners of shutdown request")
for listener in self.on_shutdown_requested_listeners:
listener.on_shutdown_requested()
raise RuntimeError("No listeners initiated shutdown!")
elif button.pin == RotaryEncoder.DOWN and len(self.on_shutdown_requested_listeners) > 0:
try:
for listener in self.on_reset_requested_listeners:
listener.on_reset_requested()
finally:
microcontroller.reset()
if was_pressed and listen_for_buttons:
response = key
break
if listen_for_rotation:
current_position = self.encoder.position
last_position = self.last_position
self.last_position = current_position
if current_position > last_position:
response = RotaryEncoder.CLOCKWISE
elif current_position < last_position:
response = RotaryEncoder.COUNTERCLOCKWISE
microcontroller.watchdog.feed()
return response