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Ixxat USB-to-CAN v2 | python-can: Close bus, ACK and send_periodic errors #1605
Description
Hi,
I'm new with python-can (package version= 4.2.1, running on python3.9.6, under Windows 10) and I wanted to perform a test to send/read CAN message using USB-to-CAN v2 (and SimplyCAN as target).
But I faced few issues using python-can:
1. Close bus error:
import can
bus = can.interface.Bus(interface='ixxat', channel=0, bitrate=250000, extended=True)
heartbeat = can.Message(arbitration_id=0x11487020, is_extended_id=True, data=[0x01])
bus.send(heartbeat)
bus.shutdown()
Above is the code I used to send CAN message. The point is once the code has been performed, it seems to not close properly the CAN bus.
Bellow the error I got:
IXXATBus was not properly shut down
Exception ignored in: <function BusABC.__del__ at 0x000001ACF1418CA0>
Is there a way to properly close the CAN bus ? As i can rerun this script even after the error, should I just not taking account this error ?
2. send_periodic :
I wanted to send CAN message every seconds using the method "send_periodic" but it raise the bellow exception:
AttributeError: 'IXXATBus' object has no attribute '_periodic_tasks'
As in the doc, it's written that for Ixxat devices, the method "send_periodic" is supported, what did I misunderstand for the use of send_periodic method using Ixxat devices ? Bellow the code for the periodic message:
import can
bus = can.interface.Bus(interface='ixxat', channel=1, bitrate=250000, extended=True)
heartbeat = can.Message(arbitration_id=0x11487020, is_extended_id=True, data=[0x01])
bus.send_periodic(heartbeat, period=1)
bus.shutdown()
3. NACK error :
If the target has a problem and couldn't ACK the CAN message, the python-can API print errors logs as bellow:
CAN acknowledgment error
CAN message flags bAddFlags/bFlags2 0x00 bflags 0x05
And even once the target is reconnected this error message still appears. Is there a way to avoid them ?
Thanks in advance for any help,
Best regards,
Antoine
Activity
zariiii9003 commentedon May 26, 2023
Hi, thanks for reporting
AntoineBricard commentedon May 30, 2023
Hi zariiii9003,
Thanks for the link, using it could avoid the incorrect shutdown issue.
Here is the log I got:
But using a SimplyCAN as target, I could see that the
bus.send_periodicmethod is working but it raise the above exception.Is there a way to fix it or should I just use try/except statement in order to skip the Exception ?
Best regards,
Antoine
zariiii9003 commentedon Jul 6, 2023
@AntoineBricard Can you test #1628?
AntoineBricard commentedon Jul 7, 2023