Simplify and organise

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

@@ -3,7 +3,6 @@ Then turn the wheel slowly to see the change"""
 import board
 import rp2pio
 import adafruit_pioasm
-import time
 
 pio_input = """
 .program pio_input

ch-6/1-simple-input/pio_one_encoder_on_off_2_pins.py

@@ -3,7 +3,6 @@ Then turn the wheel slowly to see the change"""
 import board
 import rp2pio
 import adafruit_pioasm
-import time
 
 pio_input = """
 .program pio_input

ch-6/2-change-conditions/pio_one_encoder_when_changed.py

@@ -0,0 +1,41 @@
+"""Send this code, run and watch the repl.
+Then turn the wheel slowly to see the change"""
+import board
+import rp2pio
+import adafruit_pioasm
+
+pio_input = """
+.program pio_input    
+    set y, 0            ; clear y
+read:
+    mov x, y            ; store old Y in x
+    in null, 31         ; Clear ISR
+    in pins, 2          ; read in two pins (into ISR)
+    mov y, isr          ; store ISR in y
+    jmp x!=y different  ; Jump if its different
+    jmp read            ; otherwise loop back to read
+
+different:
+    push noblock        ; put ISR into input FIFO
+    jmp read            ; loop back
+"""
+
+assembled = adafruit_pioasm.assemble(pio_input)
+
+## set up a statemachine
+sm = rp2pio.StateMachine(
+    assembled,
+    frequency=2000,
+    first_in_pin=board.GP20,
+    in_pin_count=2
+)
+
+buffer = bytearray(1) # an array of bytes to read into - we are just asking for a byte (are we though? It might be 4 bytes)
+
+while True:
+    # read data from the fifo
+    # print (sm.in_waiting)
+    if sm.in_waiting:
+        data = sm.readinto(buffer)
+        # print it.
+        print("{:08b}".format(buffer[0]))

ch-6/2-change-conditions/pio_two_encoders_when_changed.py

@@ -0,0 +1,56 @@
+"""Send this code, run and watch the repl.
+Then turn the wheel slowly to see the change"""
+import board
+import rp2pio
+import adafruit_pioasm
+
+pio_input = """
+.program pio_input    
+    set y, 0            ; clear y
+read:
+    mov x, y            ; store old Y in x
+    in null, 31         ; Clear ISR
+    in pins, 2          ; read in two pins (into ISR)
+    mov y, isr          ; store ISR in y
+    jmp x!=y different  ; Jump if its different
+    jmp read            ; otherwise loop back to read
+
+different:
+    push noblock        ; put ISR into input FIFO
+    jmp read            ; loop back
+"""
+
+assembled = adafruit_pioasm.assemble(pio_input)
+
+## set up a statemachine
+left_enc = rp2pio.StateMachine(
+    assembled,
+    frequency=0,
+    first_in_pin=board.GP20,
+    in_pin_count=2
+)
+
+right_enc = rp2pio.StateMachine(
+    assembled,
+    frequency=0,
+    first_in_pin=board.GP26,
+    in_pin_count=2
+) 
+
+buffer = bytearray(1) # an array of bytes to read into - we are just asking for a byte (are we though? It might be 4 bytes)
+
+left_data = 0
+right_data = 0
+
+while True:
+    # read data from the fifo   
+    if left_enc.in_waiting:
+        left_enc.readinto(buffer)
+        left_data = buffer[0]
+        # print it.
+        print("{:08b}   {:08b}".format(left_data, right_data))
+    if right_enc.in_waiting:
+        right_enc.readinto(buffer)
+        right_data = buffer[0]
+        # print it.
+        print("{:08b}   {:08b}".format(left_data, right_data))