I am developing some software in python 3.9 and I am at the point where I have a device connected to my USB port and would like to send a basic packet to test the interface before I proceed. I am using this example to try and get my interface to work. I am not bothered about speed or byte count. I would like to see any response on the interface (But on reflection Im wondering if usb speed could be the issue):
import usb1
import usb.util
import os
import sys
import libusb
import usb.core
from usb import util
import math
dev = usb.core.find(idVendor=0x11ac,idProduct=0x317d)
with usb1.USBContext() as context:
handle=context.openByVendorIDAndProductID(
0x11ac,
0x317d,)
handle.claimInterface(0)
handle.setInterface(0)
data = bytearray(b"\\xf0\\x0f"* (int(math.ceil(0xb5db91/4.0))))
handle.controlWrite(0x40, 0xb0, 0xb5A6, 0xdb91, b"")
handle.bulkWrite(2,data,timeout=5000)
`
https://github.com/vpelletier/python-libusb1/issues/21
I have had a look in various forums for several days and cannot seem to get an answer that works. Here is the trace: Its worth noting that from time to time, this py file does run without error but does nothing, and I see no traffic traveling to the USB interface.
Can someone please help me configure a working example of how to send a packet to the interface? I have tried various things like detaching the kernel, setting configuration, etc.
For 4 days I have struggled with libusb01 & 10, after discovering libusb1, I have changed my wrapper and got a lot more success
I also see a lot of examples in forums like this one, and I always get the same response. Also Im curious as to where it appears that 0x40 is the endpoint(out)
Traceback (most recent call last):
File "/home/jbgilbert/Desktop/Packets/Backend_replace.py", line 16, in <module>
handle.claimInterface(0)
File "/usr/lib/python3/dist-packages/usb1/__init__.py", line 1213, in claimInterface
libusb1.libusb_claim_interface(self.__handle, interface),
File "/usr/lib/python3/dist-packages/usb1/__init__.py", line 133, in mayRaiseUSBError
__raiseUSBError(value)
File "/usr/lib/python3/dist-packages/usb1/__init__.py", line 125, in raiseUSBError
raise __STATUS_TO_EXCEPTION_DICT.get(value, __USBError)(value)
usb1.USBErrorBusy: LIBUSB_ERROR_BUSY [-6]
My device is a laptop, using lsmod reveals all devices linked to that particular end point, in this case because if the presence of a webcam I was unable to write to an available end point. Despite disabling the driver I had no avail and had to try to code on a machine that had less onboard accessories that proved more successful
Related
i have been trying to interface the rc522 rfid module but i cant seem to make it work. can someone help?
I am using this tutorial: https://pimylifeup.com/raspberry-pi-rfid-rc522/
I have enables SPI
None of my GPIOs are fried, i have checked them using this guide: https://forums.raspberrypi.com/viewtopic.php?t=268806
I have downloaded the libraries needed!
I have wired it this way:
The only difference is that I am using a rpi zero 2w
I have installed all libraries and i have written the code, but the rfid module doesnt seem to read or write
Can someone help me?
Discord: Yasen#7752 This is the pins i have wired the module on my rpi zero 2w.
I tried running this code:
#!/usr/bin/env python
import RPi.GPIO as GPIO
from mfrc522 import SimpleMFRC522
reader = SimpleMFRC522()
try:
text = input('New data:')
print("Now place your tag to write")
reader.write(text)
print("Written")
finally:
GPIO.cleanup()
but it didn't seem to work!
This is an example output:
pi#raspberrypi:~/pi-rfid $ sudo python3 Write.py
New data:pimylifeup
Now place your tag to write
Written
My program just doesn't print "Written". I am assuming it has something to do with the rfid modules.
Once again the tutorial i am using is: https://pimylifeup.com/raspberry-pi-rfid-rc522/. I have almost no experience as I am only 14, but i would really use some help! Thanks!
How to read a dtoverlay controlled device, i.e. sensor via pyhon3?
I can read the device via a simple cat, for example...
# cat /sys/bus/i2c/devices/1-0077/iio\:device0/in_temp_input
27130
So I know the basic setup and such is good, sensor is at address 0x77, it is a BME280 sensor, etc.
I can also read the sensor via the various python3 libraries for such sensors, say the python library from Adafruit.
But I want to use the dtoverlay method of sensor control, i.e. read, and read the sensor from python3. This seemed obvious and straight forward, but apparently not, tried the following code and got the following error.
#!/usr/bin/python3
#
#
import os
#
theSensor=os.open('/sys/bus/i2c/devices/1-0077/iio\:device0/in_temp_input', os.O_RDONLY)
os.lseek(theSensor, 0, os.SEEK_SET)
print(os.read(theSensor, 2))
theSensor.close()
And the error...
# python3 BME280-OverLay.py
Traceback (most recent call last):
File "/root/BME280-OverLay.py", line 17, in <module>
theSensor=os.open('/sys/bus/i2c/devices/1-0077/iio\:device0/in_temp_input', os.O_RDONLY)
FileNotFoundError: [Errno 2] No such file or directory: '/sys/bus/i2c/devices/1-0077/iio\\:device0/in_temp_input'
Is there some trick to reading this specific device path via python3? The simple cat works.
In your initial cat command, you noticed that there's a \ inside the URL. That's an escape character. It might be there because you used autocompletion with the Tab key ; in this case bash adds it automatically, even though in fact cat doesn't need it, but deals with it.
python doesn't (deal with it). You'll have to feed open() with the clear path syntax.
By the way you can use a plain open() call and the with syntax :
with open('/sys/bus/i2c/devices/1-0077/iio:device0/in_temp_input', 'r') as fd:
temp = fd.read()
print(temp)
This way, the file gets closed before the print() call.
PS: the fact that the file you are trying to read is on a virtual filesystem would have no impact.
I am using scapy 2.4.5 with Python 3.9.5 on Windows 11. I have npcap version 1.55 install.
I have some Wireshark packet captures that I am trying to use scapy's sniff function on the file and filter out various packets.
However, when I use filter="udp" with sniff I get an exception about tcpdump not being available.
Below is the script I am currently trying to use.
from scapy.all import *
conf.use_pcap = True
pcap_file_path = r"C:\8OCT21_DDL_00001_20211008214804"
packets = sniff(offline=pcap_file_path,
count=10,
filter="udp")
packets.summary()
However I get this exception:
File "C:\Python39\lib\site-packages\scapy\sendrecv.py", line 1263, in sniff
sniffer._run(*args, **kwargs)
File "C:\Python39\lib\site-packages\scapy\sendrecv.py", line 1072, in _run
sniff_sockets.update((PcapReader(
File "C:\Python39\lib\site-packages\scapy\sendrecv.py", line 1074, in <genexpr>
tcpdump(fname,
File "C:\Python39\lib\site-packages\scapy\utils.py", line 2095, in tcpdump
raise Scapy_Exception(
scapy.error.Scapy_Exception: tcpdump is not available
Any idea on how to use scapy sniff on Windows with npcap instead of tcpdump?
The problem is not your filter, rather it's the "offline" option in sniff function. You can perform live sniff of packets, or use rdpcap() function to first load pcap in RAM, and then do what you want to do.
from scapy.all import rdpcap
from scapy.layers.inet import UDP
scapy_cap = rdpcap("responses.pcap")
for pck in PCAP:
if pck[UDP]:
print(pck.summary())
This is not a solution to why it throws tcpdump exception, but more of a workaround to get something out of your pcap.
Keep in mind that large pcap files will eat RAM like nothing else if you try to load them with rdpcap().
I'm using the library moviepy on Linux Mint 18.1.
Specifically, it's moviepy 0.2.3.2 on python 3.5.2
Since I'm getting started, I tried this simple script, which should concatenate two videos one after the other:
import moviepy.editor as mp
video1 = mp.VideoFileClip("short.mp4")
video2 = mp.VideoFileClip("motivation.mp4")
final_video = mp.concatenate_videoclips([video1,video2])
final_video.write_videofile("composition.mp4")
The two videos are short random videos that I downloaded from YouTube. They both play perfectly, both with VLC and the standard video player provided with Linux Mint.
The script runs fine with no errors, with the final message:
[MoviePy] >>>> Building video composition.mp4
[MoviePy] Writing audio in compositionTEMP_MPY_wvf_snd.mp3
100%|██████████████████████████████| 1449/1449 [00:23<00:00, 59.19it/s]
[MoviePy] Done.
[MoviePy] Writing video composition.mp4
100%|██████████████████████████████| 1971/1971 [11:34<00:00, 2.84it/s]
[MoviePy] Done.
[MoviePy] >>>> Video ready: composition.mp4
The file is indeed created, and it also have a size (about 20 MB). However, when I try to play it, nothing happens: it seems to be corrupted. The standard video player even tells me that "there is no video stream to be played".
If I try to do the same with the interactive console, and use final_video.preview(), I get an AttributeError, along with this traceback:
In [5]: final_video.preview()
Exception in thread Thread-417:
Traceback (most recent call last):
File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
self.run()
File "/usr/lib/python3.5/threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File "<decorator-gen-211>", line 2, in preview
File "/usr/local/lib/python3.5/dist-packages/moviepy/decorators.py", line 54, in requires_duration
return f(clip, *a, **k)
File "/usr/local/lib/python3.5/dist-packages/moviepy/audio/io/preview.py", line 49, in preview
sndarray = clip.to_soundarray(tt,nbytes=nbytes, quantize=True)
File "<decorator-gen-184>", line 2, in to_soundarray
File "/usr/local/lib/python3.5/dist-packages/moviepy/decorators.py", line 54, in requires_duration
return f(clip, *a, **k)
File "/usr/local/lib/python3.5/dist-packages/moviepy/audio/AudioClip.py", line 107, in to_soundarray
fps = self.fps
AttributeError: 'CompositeAudioClip' object has no attribute 'fps'
and the video seems frozen at the first frame.
I don't have any clue, since everything seems to work fine (except with the preview, which doesn't work because of the error). I tried to reinstall ffmpeg, but no succes: everything is exactly the same. Without any useful error, I can't figure out how to fix this problem. Can anyone help me?
EDIT: What are the 4 magic letters? R-T-F-M! I solved the problem by setting the kwarg method of mp.concatenate_videoclips to compose, since the original videos have a different frame size.
To hopefully figure out what's going on, I decided to take a more systematic approach, following these steps:
Create a virtual environment with no packages other than moviepy and its dependencies
Use videos from a different source
Try different codecs and/or other different parameters
Dig into the source code of moviepy
Sacrifice a goat to the Angel of Light, the Deceiver, the Father of Lies, the Roaring Lion, Son of Perdition Satan Lucifer
In each case I will this script (test.py):
import moviepy.editor as mp
video1 = mp.VideoFileClip("short.mp4")
video2 = mp.VideoFileClip("motiv_30.mp4")
final_video = mp.concatenate_videoclips([video1,video2])
final_video.write_videofile("composition.mp4")
with some minor changes, when needed. I'll update this post as I follow the steps.
1. Create a virtual environment
I created a virtual environment using virtualenv, activated it and installed moviepy with pip. This is the output of pip freeze:
decorator==4.0.11
imageio==2.1.2
moviepy==0.2.3.2
numpy==1.13.3
olefile==0.44
Pillow==4.3.0
tqdm==4.11.2
All with python 3.5.2.
After running test.py, the video is created, with no apparent problems. However, the video can't be played, neither by VLC nor by the default video player of Linux Mint 18.1.
Then, I noticed that mp.concatenate_videoclips has the kwarg method, which is by default set to chain. In the documentation, I read that:
- method="compose", if the clips do not have the same
resolution, the final resolution will be such that no clip has
to be resized.
So, I tried to use the kwarg method="compose", since the two videos have different frame sizes and... it worked. I am an idiot. Oh well, no goats for Satan, I suppose. Lesson learned: RTFM
I was having the same trouble.
I fond the solution at https://zulko.github.io/moviepy/FAQ.html
It turns out that the video cannot have a odd ratio like 1080 x 351, so you just have to check if it's not even them add ou subtract one from that.
I would like to work with excell sheets (.xls likely per .ods conversion) via python while maintaining all of the sheet's original content. Unlike xlutils (http://www.python-excel.org/) the iac-protocol (http://pythonhosted.org/iac-protocol/index.html) seems to me to be more fit/elegant tool to maintain sheet's style,formulas,dropboxes etc. One of the steps to launch iac's server or interpreter (iacs/iaci) is to initialize the interface which consists among others of this command:
import iac.app.libreoffice.calc as localc
While import iac.app.libreoffice works fine
moving to calc level
import iac.app.libreoffice.calc
throws following error
import iac.app.libreoffice.calc
Traceback (most recent call last):
File "", line 1, in
File "/usr/lib/python3.4/site-packages/iac/app/libreoffice/calc.py", line 11, in
from uno import getComponentContext
ImportError: cannot import name 'getComponentContext'
From what I've learned so far on this forum it might be linked to method name duplicity between two modules. This is where I am stuck. How do I learn which other module has such name of a method and how to fix it? Both iac-protocol and unotools are modules downloaded via pip3. I did not created method of such name in any script.
Thank you in advance for any advice!
Python3.4 on Scientific Linux release 7.3 (Nitrogen) LibreOffice 5.0.6.2 00(Build:2)
Some questions to narrow down the problem:
Did you start libreoffice listening on a socket first?
Did you import anything else before import iac.app.libreoffice.calc?
What happens when you start python in a terminal and enter from uno import getComponentContext?
I installed iac-protocol on Linux Mint and was able to import iac.app.libreoffice.calc and then use it. The installation process was complex, so I wouldn't be surprised if there is some problem with how your packages were installed, or possibly it does not work on RHEL-based systems. For one thing, it required me to install gnumeric.
The Calc "Hello World" code that worked for me is as follows.
libreoffice "--accept=socket,host=localhost,port=18100;urp;StarOffice.ServiceManager" --norestore --nofirststartwizard --nologo --calc &
python3
>>> import iac.app.libreoffice.calc as localc
>>> doc = localc.Interface.current_document()
>>> sheet = doc.getSheets().getByIndex(0)
>>> cell = sheet.getCellByPosition(0,0)
>>> cell.setString("Hello, World!")
One more thought: Have you considered using straight PyUNO starting from import uno instead of a wrapper library? That would avoid dependency on some of the extra libraries which may be causing the problem. Also there is better documentation for straight PyUNO.