Inky Frame: Use new PWMLED for led_busy and led_wifi.

micropython/modules_py/inky_frame.py

@@ -1,4 +1,4 @@
-from pimoroni import ShiftRegister
+from pimoroni import ShiftRegister, PWMLED
 from machine import Pin, I2C, RTC
 from wakeup import get_shift_state, reset_shift_state
 from micropython import const
@@ -167,5 +167,5 @@ button_c = Button(sr, 5, LED_C)
 button_d = Button(sr, 4, LED_D)
 button_e = Button(sr, 3, LED_E)
 
-led_busy = Pin(LED_BUSY, Pin.OUT)
-led_wifi = Pin(LED_WIFI, Pin.OUT)
+led_busy = PWMLED(LED_BUSY)
+led_wifi = PWMLED(LED_WIFI)

micropython/modules_py/pimoroni.py

@@ -224,3 +224,30 @@ class ShiftRegister:
 
     def is_set(self, mask):
         return self.read() & mask == mask
+
+
+# A basic wrapper for PWM with regular on/off and toggle functions from Pin
+# Intended to be used for driving LEDs with brightness control & compatibility with Pin
+class PWMLED:
+    def __init__(self, pin, invert=False):
+        self._invert = invert
+        self._led = PWM(Pin(pin, Pin.OUT))
+        self._led.freq(1000)
+        self._brightness = 0
+        self.brightness(0)
+
+    def brightness(self, brightness):
+        brightness = min(1.0, max(0.0, brightness))
+        self._brightness = brightness
+        if self._invert:
+            brightness = 1.0 - brightness
+        self._led.duty_u16(int(65535 * brightness))
+
+    def on(self):
+        self.brightness(1)
+
+    def off(self):
+        self.brightness(0)
+
+    def toggle(self):
+        self.brightness(1 - self._brightness)