Add Macropad asyncio article

content/articles/2023/adafruit_macropad_asyncio/files/async_blink/code.py

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+from adafruit_macropad import MacroPad
+import usb_cdc, asyncio
+
+macropad = MacroPad()
+timer = 1
+color = 0xad20b4
+led = 0
+
+def exec_command (data):
+    global timer
+    command,option = data.split()
+    print("cmd:{} opt:{}".format(command,option))
+    if command == 'time':
+        timer = float(option)
+
+async def blink(led, color):
+    macropad.pixels.brightness = 0.3
+    while True:
+        try:
+            if  macropad.pixels[led] == (0,0,0):
+                macropad.pixels[led] = color
+            else:
+                macropad.pixels[led] = 0x0
+            print("l:{} c:{} t:{}".format(led,hex(color),timer))
+            await asyncio.sleep(timer)
+        except asyncio.CancelledError:
+            pass
+
+async def check_serial(task_led):
+    data = bytearray()
+    serial = usb_cdc.data
+    # Avec le timeout, même si la ligne ne contient pas \n, elle
+    # sera pris en compte
+    serial.timeout = 1
+    while True:
+        if serial.in_waiting:
+            data = serial.readline()
+            print("serial data received")
+            exec_command(data.decode("utf-8"))
+            task_led.cancel()
+        await asyncio.sleep(0)
+
+async def main():
+    t_led = asyncio.create_task(blink(led, color))
+    t_serial = asyncio.create_task(check_serial(t_led))
+    await asyncio.gather(t_led, t_serial)
+
+asyncio.run(main())