Refactor hw initialization so that we can shut down the digipot as so…

…on as the app is launched, fixes #4

digipot.py

@@ -0,0 +1,26 @@
+import os
+
+os.environ["BLINKA_MCP2221"] = "1"
+
+try:
+    import board
+    import busio
+except RuntimeError:
+    print("Titler not conneted to USB!")
+
+
+def hardware_setup():
+    # from adafruit_blinka.microcontroller.mcp2221 import mcp2221
+    # mcp2221.mcp2221.gp_set_mode(3, 0b001)  # turn LED_I2C on
+    from adafruit_bus_device.i2c_device import I2CDevice
+    i2c = busio.I2C(board.SCL, board.SDA)
+    pot = I2CDevice(i2c, 0x2C)
+    return pot
+
+
+def write_to_pot(value, pot):
+    pot.write(bytes([0x00 & 0xff, value & 0xff]))
+
+
+def shutdown_pot(pot):
+    pot.write(bytes([0x20 & 0xff, 0 & 0xff]))

hardware.py

@@ -1,8 +1,8 @@
 # Finding out how many times to push a button and how.
-import os
 import sys
 import time
 
+from digipot import *
 from settings import PRESS, HOLD, wipers, recorder
 
 if recorder == 'R70/90/91':
@@ -15,16 +15,6 @@
     from definitions.r900 import change_set_moves, set_initial, set_uppercase, \
         set_lowercase, set_numbers, set_complete, entrypoints
 
-# help Blinka find our microcontroller
-os.environ["BLINKA_MCP2221"] = "1"
-
-try:
-    import board
-    import busio
-except RuntimeError:
-    print("Titler not conneted to USB")
-    sys.exit()
-
 
 def return_current_set(letter, current_set):
     # find out where we ended up, this carries over to the next letter
@@ -86,23 +76,6 @@ def input_string(string_ascii):
     push_button('Stop', HOLD, 1)  # finish entry
 
 
-def hardware_setup():
-    # from adafruit_blinka.microcontroller.mcp2221 import mcp2221
-    # mcp2221.mcp2221.gp_set_mode(3, 0b001)  # turn LED_I2C on
-    from adafruit_bus_device.i2c_device import I2CDevice
-    i2c = busio.I2C(board.SCL, board.SDA)
-    pot = I2CDevice(i2c, 0x2C)
-    return pot
-
-
-def write_to_pot(value, pot):
-    pot.write(bytes([0x00 & 0xff, value & 0xff]))
-
-
-def shutdown_pot(pot):
-    pot.write(bytes([0x20 & 0xff, 0 & 0xff]))
-
-
 def push_button(button, timing, times):
     for _ in range(times):
         write_to_pot(wipers[button], ad5245)

mdrec.py

@@ -7,6 +7,14 @@
 
 from webapi import *
 from settings import PRESS, OFFSET
+from digipot import *
+
+try:
+    ad5245 = hardware_setup()
+except NameError:
+    print("Initialization skipped")
+else:
+    shutdown_pot(ad5245)
 
 try:
     from gooey import Gooey
@@ -31,7 +39,7 @@ def parse_arguments():
     parser.add_argument('--only_label', default='OFF', dest='label_mode', choices=['OFF', 'ON', 'ERASE'],
                         help='Label a recorded disc')
     parser.add_argument('--no-tmarks', dest='no_tmarks', action='store_true',
-                    help='Add 2s of silence instead of TMarks between tracks')
+                        help='Add 2s of silence instead of TMarks between tracks')
     return parser.parse_args()