Migrate MCP and utilities to CircuitPython, including color GIF and volume fixes

circuitpython/lib/button_cp.py

@@ -0,0 +1,73 @@
+"""CircuitPython polled and debounced Button driver.
+
+Replaces the MicroPython Pin IRQ implementation with active loop polling.
+"""
+
+import time
+import digitalio
+
+class Button:
+    def __init__(self, pin_obj, name="Button", debounce_ms=50, long_press_ms=800):
+        self.pin = digitalio.DigitalInOut(pin_obj)
+        self.pin.switch_to_input(pull=digitalio.Pull.UP)
+        self.name = name
+        self.debounce_s = debounce_ms / 1000.0
+        self.long_press_s = long_press_ms / 1000.0
+
+        self.last_state = True
+        self.press_time = 0.0
+        self.last_debounce_time = 0.0
+
+        self.click_callback = None
+        self.long_press_callback = None
+
+    def is_pressed(self):
+        return not self.pin.value
+
+    def on_click(self, callback):
+        self.click_callback = callback
+        return callback
+
+    def on_long_press(self, callback):
+        self.long_press_callback = callback
+        return callback
+
+    def update(self):
+        now = time.monotonic()
+        val = self.pin.value
+
+        if (now - self.last_debounce_time) < self.debounce_s:
+            return
+
+        if val != self.last_state:
+            self.last_debounce_time = now
+            self.last_state = val
+
+            if not val:
+                # Pressed (Active Low)
+                self.press_time = now
+            else:
+                # Released
+                if self.press_time > 0.0:
+                    duration = now - self.press_time
+                    self.press_time = 0.0
+
+                    if duration >= self.long_press_s:
+                        if self.long_press_callback:
+                            self.long_press_callback()
+                    else:
+                        if self.click_callback:
+                            self.click_callback()
+
+class BoardButtons:
+    def __init__(self, boot_pin, key_pin=None):
+        self.boot = Button(boot_pin, "BOOT")
+        if key_pin is not None:
+            self.key = Button(key_pin, "KEY")
+        else:
+            self.key = None
+
+    def update(self):
+        self.boot.update()
+        if self.key is not None:
+            self.key.update()