working on OLED queues

user_program/usb4vc_usb_scan.py

@@ -5,6 +5,8 @@ import spidev
 import threading
 import RPi.GPIO as GPIO
 
+from usb4vc_oled import oled_display_queue
+
 """
 sudo apt install stm32flash
 
@@ -174,6 +176,7 @@ def usb_device_scan_worker():
             device_file_list = os.listdir(input_device_path)
         except FileNotFoundError:
             print("No input devices found")
+            oled_display_queue.put((0, 'no input'))
             continue
         except Exception as e:
             print('list input device exception:', e)