uart demo

Introducing_Trinket_M0/Trinket_UART.py

@@ -0,0 +1,24 @@
+# Trinket IO demo - USB/Serial echo
+
+from digitalio import DigitalInOut, Direction
+import board
+import busio
+import time
+
+led = DigitalInOut(board.D13)
+led.direction = Direction.OUTPUT
+
+# You can also use board.TX and board.RX for prettier code!
+uart = busio.UART(board.D4, board.D3, baudrate=9600)
+
+while True:
+    data = uart.read(32)  # read up to 32 bytes
+    #print(data)          # this is a bytearray type
+
+    if data != None:
+        led.value = True
+
+	datastr = ''.join([chr(b) for b in data]) # convert bytearray to string
+	print(datastr, end="")
+
+        led.value = False