move usb_is_connected to util.py

Author: xiongyihui

keyboard/__init__.py

@@ -15,6 +15,7 @@
 from .hid import HID
 from .model import Matrix, COORDS, Backlight, battery_level
 from .action_code import *
+from .util import usb_is_connected
 
 
 # fmt: off
@@ -32,16 +33,6 @@ def key_name(key):
     return KEY_NAME[COORDS[key]]
 
 
-@micropython.asm_thumb
-def mem(r0):
-    """Read memory from the address"""
-    ldr(r0, [r0, 0])
-
-
-def usb_is_connected():
-    return mem(0x40000438) == 0x3
-
-
 def reset_into_bootloader():
     microcontroller.on_next_reset(microcontroller.RunMode.BOOTLOADER)
     microcontroller.reset()

keyboard/util.py

@@ -0,0 +1,9 @@
+
+@micropython.asm_thumb
+def mem(r0):
+    """Read memory from the address"""
+    ldr(r0, [r0, 0])
+
+
+def usb_is_connected():
+    return mem(0x40000438) == 0x3