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@Evidlo Evidlo/evidlo_magstripe.py
Last active Apr 19, 2018

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#/bin/env python3
## Evan Widloski - 2017-01-06
## Asynchronous magstripe reader example
## Requires root and >= python 3.5
# Much taken from: http://python-evdev.readthedocs.io/en/latest/tutorial.html#reading-events-from-multiple-devices-using-asyncio
import asyncio, evdev
# MSR100 reader vendor/product ids
vendor = 0xc216
product = 0x0180
# find card reader from vendor and product ids
try:
devices = [evdev.InputDevice(device) for device in evdev.list_devices()]
card_reader = next(device for device in devices
if device.info.vendor == vendor and device.info.product == product)
except StopIteration:
print('Device not found: productID: {0}, vendorID: {1}'.format(hex(vendor), hex(product)))
for device in devices:
device.close()
quit()
# take full control of reader (requires root)
card_reader.grab()
print('Connected to device: productID: {0}, vendorID: {1}'.format(hex(vendor), hex(product)))
# handle device events asynchronously
async def process_events(device):
try:
async for event in device.async_read_loop():
# only get keypress events
if event.type == evdev.ecodes.EV_KEY:
decoded_key = evdev.categorize(event)
# only get downpress
if decoded_key.keystate == decoded_key.key_down:
print(decoded_key.keycode)
except OSError as e:
print('Connection to reader lost.')
for device in devices:
device.close()
loop.stop()
asyncio.ensure_future(process_events(card_reader))
loop = asyncio.get_event_loop()
try:
loop.run_forever()
except KeyboardInterrupt as e:
print('Caught keyboard interrupt. Freeing reader...')
card_reader.ungrab()
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