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Cannot open /dev/ttyusb0 input/output error

Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. So I need to read the data from the device and process the output. I am getting the data with screen command from Linux command line but I was not able to take the value from screen and cannot pass to my application. I have used the code shown below but it shows currently the resource is unavailable even though I have given chmod permissions.

When you now call read and there is currently no data to read you get this error. Learn more. Ask Question. Asked 7 years, 3 months ago. Active 7 years, 3 months ago. Viewed 13k times. Improve this question. Simon Fischer 1, 6 6 silver badges 10 10 bronze badges. Do you get the error at the open or at the read function? Petesh i have completely closed screen and i tried after rebooting also.

Still its showing same. What is the content of the errno variable directly after the read call? Active Oldest Votes. Improve this answer. Simon Fischer Simon Fischer 1, 6 6 silver badges 10 10 bronze badges. Resource unavailable.

Or Is there any way to take the data from the screen to a pipe. 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 Owning the code, from integration to delivery.

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Send this topic Print. Hi, I'm new developper with Code::Blocks When I run the program without debbuging. Posts: Can you be more clear what the problem is? Your program fails when? When you single step?

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What happens if you debug it using command line gdb? Does it still fail? Debuggers change timing behaviour of programs, so if you have a timing bug then it is possible that the debugger is exaggerating it. BlueHazzard Developer Lives here! Thank you for your answer. Yes of course, my access to the serial port is made by an ifstream object. I can run in step by step mode or run with debugging my program, the program is waiting for a while and the port is not opened. Quote from: meranges on February 10,am.

I keep on my investigations. It seems to be linked with the amount of data sended by the serial port. There is continously data on the serial port. If I stop the streamor I reduce it, all works fine.

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I don't understand the link between the amount of data and this error even more beacause it woks fine on a small Raspberry Pi Zero. Miguel Gimenez Lives here! This is the same limit in a computer and in the Raspberry Pi Zero.It only takes a minute to sign up. I'm trying to see the output of an accelerometer with Ubuntu The UART driver is cpx.

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So, when I plug the device, I have this:. I have tried a lot of tools, cutecom, minicom, screen And no signs but the LED of the card which flash when I turn the card. Could someone help me to solve this? I've seen this question but no solution for me.

This accelerometer is in fact a "specialized" Arduino card, I didn't know! More info here if it can help someone. For example, to view information that comes from the device behind the converter, you can use a command of the form:. Sign up to join this community. The best answers are voted up and rise to the top.

Asked 5 years, 9 months ago. Active 2 years, 7 months ago. Viewed 20k times. Improve this question. Guillaume Guillaume 2 2 gold badges 3 3 silver badges 14 14 bronze badges. Active Oldest Votes. Improve this answer. You can use the utility PuTTY and the like. Alex Alex 11 1 1 bronze badge.

Federico Federico 2 2 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

cannot open /dev/ttyusb0 input/output error

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Quick links. This is the only serial port on this machine Dell tower This is the first time I have tried to use it on this machine and I cannot get it working. I have used minicom and it won't communicate to my external device.

On my laptop, which is also running Centos 5, the port works fine to my external device. I have the same minicom port settings speed, baud,etcbut it still will not work. Is there anything else I need to do to enusre the port is setup in the OS for usage? Should I have? In another web page, someone mentioned that when they disabled the XEN kernel, it fixed it.

Not sure how to go about doing that. I found another link which someone said that their issue was the XEN kernel. So I am wondering how to disable this can go with a "normal"?

I learned after the fact that this kernel is probably for virtualization - which I really don't need on this machine. So per tomacat's post in the other thread, I did follow his suggestions, but its still booting up XEN. I had read elsewhere that for some reason the XEN kernel and ttyS0 don't work well together, so since I didn't need XEN, I was finally able to get it disabled - thanks to the folks on this site.

Thanks to toracat and Alan for their assistance. Still have lots to learn. In general, if you have a problem: a do some investigation first b ask here, telling us what you've tried and any of us will be happy to try to help. Board index All times are UTC.I was a bit fed up of login managers, so I decided to get rid of GDM and go for the startx command.

I have Xfce as DE, so I added the following line to. I also did:. But I keep getting the same error. Any help is greatly appreciated, Thanks for your time. Have you Syued today? Free music for free people! Log in as root on console and try startx, you'll probably get errors due to missing packages root is set to use windowmaker with xclock and some other stuff but it will help to determine where your problem is. I have tried to pipe the output of startx to a file using. I have also tried checking manually, but I could not scroll up to the top to check all the output.

So in my text file I got this:. I don't think I actually have to run "startx" in tty7 to make it start there. I was on tty1 when I ran startx, but I got a permission issue on vc7, that's why I chowned it to my user Thanks for your replies, by the way.

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Those Xorg. Though it's not really the user, just the equally named, unique user group. If you want to catch all the output a program does for the next time, use this instead which will log both stdout and stderr:.

Unfortunately I don't have a solution but maybe you can get something interesting from your log files from now. There you'll find a solution to your "Can't move Xorg. I had the same problem with the Xorg.

I don't know why this problems occurs, but currently it seems to occur more often then usual, maybe a bug? Why are we here? What is the sense of life? Wow thanks! That did the trick. Thanks a lot, you don't know how much I was desiring to dump the greeter. Atom topic feed.I just recently upgraded to pyserial 2.

I've tried downgrading back to pyserial 2. I am getting the same error in my test setup, in which I am reading from a microcontroller using a serial-to-USB device.

I do not know what is causing a the problem leading to the Exceptions.

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I think the inWaiting code has not changed since several releases. Are you sure it isn't a bad cable, software or power supply on the MCU side that makes the USB device appear and disappear for example?

I am getting the same error in an application I am developing, in which I am reading from a microcontroller using a serial-to-USB device. It seems some buffer on the driver side gets filled up if no one reads the stream; this causes the exception in pySerial and also some changes in the behaviour of the serial-to-USB chip, but I did not investigated too muchright after the application tries to use the port. Since, just after the exception, the application can be restarted properly, I am now simply catching the IOError and going on with my reading thread.

In such way I am able of starting the application even if there microcontroller has already written some data. Oh no! Some styles failed to load. Help Create Join Login. Application Development. Operations Management. IT Management. Project Management.

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Resources Blog Articles. Menu Help Create Join Login. Python Serial Port Extension Brought to you by: cliechti. Status: open. Owner: Chris Liechti. Priority: 5. Updated: Created: Creator: EvanstonW.Raspberry Pi Stack Exchange is a question and answer site for users and developers of hardware and software for Raspberry Pi.

It only takes a minute to sign up. I'm trying to open a Serial communication between a Raspberry Pi 3 model B, running on Raspbian and a device a traffic counter to be precise. My goal is to be able to open a serial communication between this device and my rpi3 using python and the pyserial library.

What is going on? How could I open a serial communication in python?

cannot open /dev/ttyusb0 input/output error

You need to load the ftdi-sio module manually with modprobe and specifying vendor and product id, or follow the guidelines in their manual at. Sign up to join this community. The best answers are voted up and rise to the top. Asked 2 years, 2 months ago. Active 12 days ago. Viewed 10k times. I've a USB to Serial cable, using the rs standard. Improve this question. Bast Cha Bast Cha 11 1 1 gold badge 1 1 silver badge 3 3 bronze badges.

cannot open /dev/ttyusb0 input/output error

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