def run_prod(self):
while True:
# scan for devices
devices = [evdev.InputDevice(fn) for fn in evdev.list_devices()]
# find card reader device
if (len(devices) > 0):
print("Input event devices available (" + str(len(devices)) +
"). Devices are: ")
# init card reader discovery bool
discovered_card_reader = False
# display input devices
for i, device in enumerate(devices):
print(" " + str(i) + ") (" + device.fn + ", " +
device.name + ", " + device.phys + ")")
# search for card reader by its name, "HID c216:0180"
if str(device.name) == "HID c216:0180":
print("Discovered card reader..listening for events \
until test harness is closed.")
# rename device for readability
card_reader = device
# indefinitely listen for events
byte_count = 0
student_id = 0
for event in card_reader.read_loop():
if event.type == evdev.ecodes.EV_KEY:
event_key_state = evdev.util.categorize(
event).keystate
keycode_str = evdev.util.categorize(
event).keycode
if byte_count < 7:
if event_key_state == KEY_STATE_DOWN and keycode_str in VALID_KEY_HASH:
keycode_int = VALID_KEY_HASH[
keycode_str]
exponent = int(
math.pow(10, (6 - byte_count)))
student_id += int(
keycode_int) * exponent
byte_count += 1
# end of student id
if byte_count == 7:
self.eventQueue.put(
Events.CardReadEvent(
{"id": student_id}))
student_id = 0
if event_key_state == KEY_STATE_UP and keycode_str == "KEY_ENTER":
# last byte in card, so reset byte count
byte_count = 0
# error out if unable to find card reader
if not discovered_card_reader:
print("ERROR: Unable to find the card reader")
time.sleep(1) # delay until next attempt to connect
def run_test(self):
while True:
time.sleep(10)
self.eventQueue.put(Events.CardReadEvent({"id": 1234567}))
