[英]python :Read from a USB HID device
I have a USB RFID device that appears on /dev/hidraw for my serial devices they appear on /dev/ttyUSB* i used pyserial and it works like charm but for this one i couldn't read from it using cat /dev/hidraw0
need root privileges plus i need to read one line and not keep on listening 我有一个USB RFID设备出现在/ dev / hidraw中,而我的串行设备出现在/ dev / ttyUSB *中。我使用了pyserial,它的工作方式像魅力一样,但是对于这个,我无法使用
cat /dev/hidraw0
需要root权限加上我需要读一行而不继续听
I used evdev library but my device doesn't appear at all : 我使用了evdev库,但是我的设备根本没有出现:
import evdev
devices = [evdev.InputDevice(fn) for fn in evdev.list_devices()]
for device in devices:
print(device.fn, device.name, device.phys)
So is there a proper way to read from the device programmatically ? 那么,是否有适当的方法以编程方式从设备读取内容?
By default evdev.list_devices() look only to /dev/input 默认情况下, evdev.list_devices()仅查找/ dev / input
And you need permissions to work with your device. 您需要使用设备的权限。 You can add your user to group which own your device (see $ ls -l /dev/hidraw0 )
您可以将用户添加到拥有设备的组中(请参阅$ ls -l / dev / hidraw0)
Then you need to listen your device in loop 然后,您需要循环收听设备
#!/usr/bin/python3
import evdev
devices = [evdev.InputDevice(fn) for fn in evdev.list_devices()]
for device in devices:
print(device.fn, device.name, device.phys)
device = evdev.InputDevice("/dev/input/event4")
print(device)
for event in device.read_loop():
print(event)
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