Linux candump output

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Aside from the filter not behaving like I expected and passing through 0x, the fact that it shows up twice suggests that this frames is actually matched by both filters, which makes even less sense to me.

Can anyone explain why this is happening, and perhaps show me the correct way to do it?

From the help of candump :. Regarding the duplication problem, it probably happens because you use two filters, although I am not sure about this. With the idea of using a 29 bit mask for the first ID, since it's a bit ID, and likewise an 11 bit mask for the second ID. However, this didn't work the way I expected either- I don't have the output in front of me and I can't remember what exactly the discrepancy was, but there was one.

You're suggesting to use a bit mask - can you explain why that would work but using a mask with 29 bits set did not work? Or am I just completely misunderstanding it? Learn more. Asked 5 years ago. Active 5 years ago. Viewed 13k times.

linux candump output

So I do this: candump can0, But this gives ALL frames, and each frame is shown twice. Erik Nyquist. Erik Nyquist Erik Nyquist 1, 2 2 gold badges 9 9 silver badges 23 23 bronze badges. Active Oldest Votes. The duplicate messages normally happen when using loopback mode!

The reason I say almost is because I tried this: candump can0,fffffff,ff With the idea of using a 29 bit mask for the first ID, since it's a bit ID, and likewise an 11 bit mask for the second ID.

I am away from my system for now, I will be able to test it tomorrow and will report back then.When setting up and testing any new system some of the most common things I tend to want to do are:. Candump probably the most useful of all the tools as it will dump information from the CANbus to stdout. Will then listen on the interface can0 and dump any CAN frames it sees to the terminal window. It is possible to tell canplayer to play messages recorded on one interface back on another interface.

I hope that this brief introduction to can-utils is useful to readers, I have only scratched the surface of what they can do.

linux candump output

I strongly recommend using the -h argument with each of the tools to discover the full extent of what each tool can do. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.

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You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Introduction When setting up and testing any new system some of the most common things I tend to want to do are: view raw output transmit raw input log the output re-play the logs SocketCAN is no exception and the tools included with can-utils does just this.

Plus more. Share this: Twitter Facebook. Like this: Like Loading Leave a Reply Cancel reply Enter your comment here Please log in using one of these methods to post your comment:. Email required Address never made public. Name required. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: Cookie Policy.In the case of the AM35x platform the configuration is:.

Working with the CAN bus requires enabling the 'ip' tools from iproute2 package the 'ip' tool from busybox won't work. The socketcan package is optional and provide you with tools to debug your can bus. To run candump, just specify the CAN interface:. You can also telnet into the target hardware and use cansend to put a packet on the bus that can be monitiored with candump.

Which indicates GPIO is configure as an in put, currently has a hi gh logic level, is mapped to IRQand causes an interrupt on the falling edge. With OMAP3, you also need to verify the pad where the signal leaves the chip is configured properly.

The titles of the following sections are text that gets displayed when a problem occurs. Each section describes how to resolve the issue. Then there is a problem with the interrupt signal from the MCPx chip back to the driver. You need to enable and build iproute2 to get an up-to-date ip command that supports the can bus. You are using an older version of the mcp driver. Update to a newer version of the driver and the warning will go away.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm trying to do some scripting, but one of the utilities I have returns a value to stdout, where I would like to assign it to a variable. The documentation on candump what is dumping the data to stdout is sparse. If you aren't expecting a ton of output or don't mind reading it in all at once, you can use subprocess.

If you do need to read it line-by-line, take a look at this question: read subprocess stdout line by line. Learn more. How to use python to extract data that is pushed to stdout? Ask Question. Asked 7 years, 7 months ago. Active 7 years, 7 months ago. Viewed times. The utility candump is constantly running and only prints to std out when it receives data. Sorry if this is incredibly obvious Chris Chris 6, 11 11 gold badges 38 38 silver badges 57 57 bronze badges.

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How to configure and use CAN bus

Blender Blender k 43 43 gold badges silver badges bronze badges. So that would only work if I call the process 'ls' in your example at a specific time. I'm trying to figure out how to incorporate that strategy with my candump which is constantly running in another thread and only dumps out data as it comes in and am having a tough time with it. I'll keep plugging away, but if you've got any htoughts I'd love to hear them.

Chris: Then check out the question that I linked to.

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Chris: Regarding the answer linked above, using ['stdbuf', '-oL' 'candump', 'can0'] may help if candump buffers its output when piped.

If it works, you can iterate with iter proc. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Ben answers his first question on Stack Overflow. The Overflow Bugs vs. Featured on Meta. Responding to the Lavender Letter and commitments moving forward.

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linux candump output

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Latest commit 7cb3e76 Aug 18, History. This patch adds a fourth string field in the can logfile format. To generate the logfile format with this extra field candump has to be called with the '-x' option for extra message infos, e. The format extension does not affect legacy tools, e. Therefore the existing logfiles remain valid and usable.

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They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. Click Here to receive this Complete Guide absolutely free. Hello, I'm looking for some help with getting Socketcan to work. I've watched several videos and read as much as I could find on the subject. Once my cables arrived, I tried running candump, but got no output. I set up the can0 interface using bitrate thenbut neither showed any scrolling output at all.

I'm using ubuntu If anyone's used Socketcan successfully, please help me out. Thread Tools. BB code is On. Smilies are On. All times are GMT The time now is AM. Twitter: linuxquestions. Open Source Consulting Domain Registration. Search Blogs. Mark Forums Read. Socketcan question - reason for no candump output? User Name.

Remember Me? Linux - Newbie This Linux forum is for members that are new to Linux.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I have installed linux kernel 5. I go forward as desribed in can-jkickstart.

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On terminal Result on terminal 2 :. Hi josemic. Hi olerem. If you are refferring with 3. Hi josemici refer to your comment:. This was not my copy and paste error.

This comes directly from "can-jkickstart. Please note that this occurs twice in "can-jkickstart. Could you please patch "can-jkickstart. I think you can edit it directly via the github web interface. Editing via github web interface is stupid simple! Thanks for the hint. Looks still like a permission problem.

Could it be that the signal handler in jacd is running without su rights?


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