put into enumerated stages

ch-6/1-simple-input/pio_one_encoder_on_off.py

@@ -0,0 +1,29 @@
+"""Send this code, run and watch the repl.
+Then turn the wheel slowly to see the change"""
+import board
+import rp2pio
+import adafruit_pioasm
+import time
+
+pio_input = """
+.program pio_input
+    in pins, 1      ; read in pin (into ISR)
+    push noblock    ; put this into input FIFO
+"""
+
+assembled = adafruit_pioasm.assemble(pio_input)
+
+## set up a statemachine
+sm = rp2pio.StateMachine(
+    assembled,
+    frequency=2000,
+    first_in_pin=board.GP20
+)
+
+buffer = bytearray(1) # an array of bytes to read into - we are just asking for a byte
+
+while True:
+    # read data from the fifo
+    data = sm.readinto(buffer)
+    # print it.
+    print("{:08b}".format(buffer[0]))