Chapter 6 code

ch-6/1-simple-input/pio_read_1_pin.py

@@ -1,8 +1,10 @@
 """Send this code, run and watch the repl.
 Then turn the wheel slowly to see the change"""
+import time
 import board
 import rp2pio
 import adafruit_pioasm
+import array
 
 pio_input = """
 .program pio_input
@@ -12,17 +14,17 @@ pio_input = """
 
 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
+buffer = array.array('I', [0])
 
 while True:
     # read data from the fifo
-    data = sm.readinto(buffer)
+    sm.readinto(buffer)
     # print it.
-    print("{:08b}".format(buffer[0]))
+    print(f"{buffer[0]:032b}")
+    time.sleep(0.1)

ch-6/1-simple-input/pio_read_2_pins.py

@@ -3,6 +3,7 @@ Then turn the wheel slowly to see the change"""
 import board
 import rp2pio
 import adafruit_pioasm
+import array
 
 pio_input = """
 .program pio_input
@@ -24,6 +25,6 @@ buffer = bytearray(1) # an array of bytes to read into - we are just asking for
 
 while True:
     # read data from the fifo
-    data = sm.readinto(buffer)
+    sm.readinto(buffer)
     # print it.
     print("{:08b}".format(buffer[0]))