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I'm trying to learn how to write C code that will read from the serial port in Linux. I've found what seems to be a good tutorial here.

I want to be able to test this code, so I think I need either a serial port, or a way to write to the serial port while the code from above is reading.

I'm running Ubuntu 10.04 as a virtual machine on my Mac using virtualbox. My idea was to set up a virtual serial connection and write from the host to the guest. Hopefully something as simple as cat 'Hello World' > /tmp/fake_serial in a host terminal, and for that to be read by the program in the link above.

Is this possible? I've tried adding a serial port using virtual box and when I try to do the above command I get an error saying I can't write to a socket.

The instructions below are still valid for 'Host pipe' socket backends, if you do not want the serial port accessible over the network or if you are constrained by an older version of the hypervisor. Here are some notes on how to use a serial console with illumos running as a guest in VirtualBox. I am trying to debug the kernel of a windows 7 virtual machine and am following the steps here, here and here. How to create a serial pipe between a windows host and virtual machine in VirtualBox? VirtualBox can't connect to host serial port VERR_FILE_NOT_FOUND Updated September 23, 2017 20:01 PM. Problem with USB driver on Windows 7 installed in VirtualBox (running on Linux) Under “Device and Printers”, there is a yellow triangular sign with an exclamation mark next to “Mass Storage Device”. I launched the troubleshoot who gave the following information “There is a problem with the driver for USB Mass Stoage Device. Next we need to connect COM9 port in Host to COM1 port in Guest OS for that open Oracle VM VirtualBox Manager and open the settings of your required virtual machine. Now, select Serial Ports and setup like shown below and click OK. NOTE: Windows provides legacy names only for COM ports 1. In order for the serial-to-USB cable driver to work I have to have Windows running. To work around this problem I thought I could use a virtual machine in Hyper-V or VirtualBox that could map a serial port to a named pipe.

Virtual Serial Port Windows 7

The second option I thought of was using something like minicom inside the guest OS, to connect to say /dev/ttyS1 and write messages for my code to read at the same time. Again, assuming that the baud rates and other settings are OK, would this be possible?

I don't have a lot of experience working with serial ports, so I'd appreciate any suggestions about the best way to do this. Thanks in advance.

JamesJames

3 Answers

So to get this working I just added another Ubuntu VM on VirtualBox, and connected the two together via a virtual serial port. My main, original VM, which I use for a lot of developing will be referred to as VM1. The new VM, with a small hardrive that will only be used for sending messages to VM1 will be called VM2. These are both Ubuntu 10.04 VMs.

In VirtualBox go to Settings for VM1, go to ports, and change the settings as follows:

Now go to VM2, and select settings, ports, then change as follows:

Now first you need to start VM1. When that's booted then boot VM2. Now you can open a terminal in VM1, and type screen /dev/ttyS0 38400 (you may need to run sudo apt-get install screen before this works). Then go to VM2, open a terminal, and type echo 'Hello' > /dev/ttyS0.

You should see Hello appear in the terminal open in VM1. When you're done running screen press ctrl-a k to kill it, otherwise if you try to do other stuff with the serial port you may get an error message saying that the port is busy.

JamesJames

When I had to do some serial port testing from my real to virtual machine I ended up doing a 'loop back' type testing. I took two USB-Serial converters and a RS232 F-F adaptor and connected my machine to itself. Then in VirtualBox under Settings->USB you can route one of the two USB-Serial converters to be 'owned' by your VirtualBox.

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Once you plug in the converters one will register with the Mac and one with the Ubuntu 'computer' then you can do serial communication as normal between the two machines.

You may also be able to emulate a virtual serial port using a pty ('pseudo-teletype' device), but I'm not positive on that one since I believe the ability to do that was locked down in newer kernels.

MikeMike

I ran into a similar situation running a QNX guest using VirtualBox 5.0.10 on an Ubuntu 14.04 host.

My solution seems general enough to apply to the above-mentioned case.

I configured the guest VM in the same way that Kells1986 setup his VM1:

Under the 'Serial Ports'/'Port1' tab:

• check 'Enable Serial Port'
• set 'Port Number' to 'COM1'
• set 'IRQ' to '4'
• set 'I/O Port' to '0x3F8'
• set 'Port Mode' to 'Host Pipe'
• uncheck 'Connect to existing pipe/socket'
• set 'Path/Address' to an accessible file-system path (e.g. '/home/safayet/vmSerialPipe')

According to the VirtualBox manual:

You can tell VirtualBox to connect the virtual serial port to a software pipe on the host. .. On a Mac, Linux or Solaris host, a local domain socket is used .. On Linux there are various tools which can connect to a local domain socket or create one in server mode. The most flexible tool is socat and is available as part of many distributions.

A domain socket is an IPC mechanism on UNIX systems similar to a pipe.

I connected to the 'pipe' end of the virtual serial port on the Ubuntu host using the socat command:

Not the answer you're looking for? Browse other questions tagged cserial-portvirtualbox or ask your own question.

I am having a difficult time trying to access a serial port on VirtualBox. My Guest OS is Windows XP and the host environment is Linux Ubuntu 10.04.

The serial modem device works perfectly in Ubuntu. I can communicate with it via cutecom or just sending plain echo messages to it like so:

Ubuntu Settings and config

I have added my user account to the following group: dialout and have set the serial using the following command: sudo setserial /dev/ttyS2 but still no luck when trying to access it in my Guest OS.

Heres the settings I use to configure the serial port in VirtualBox:

I have tried all the different port modes even disconnected but still no luck. I have consulted the manual aswell but nothing works. What could be wrong? Is it virtualbox or are my ubuntu settings configured incorrectly?

Please help

Thanks

Takkat

Virtualbox Usb Serial Port

2 Answers

Setting up a serial port for VirtualBox is not easy, mainly because of many options on how to transfer data from the host to the guest. For transferring data from/to an attached device (here a modem) the following settings should work:

Of course you will have to adopt setting for your device on the host (that would be /dev/ttyS2 in your case).

If using an IRQ greater than 15 for the host you will have to enable I/O APCI as shown here:

After a setup depicted in the example here your Windows guest will see a virtual type 16450 serial port on COM1 using IRQ4 and I/O Port 0x3F8. Data will be transferred from and to host device /dev/ttyS20.

TakkatTakkat

If you are running a Windows host and a Linux Guest - you would use 'COM#:' for the port/file path. Port Mode: Host Device.

Virtualbox Serial Port Host Pipe Windows 7

If you are running a Linux host and a Windows Guest - you would use '/dev/ttyS#' for the port/file path. Port Mode: Host Device.

Virtualbox Windows 7 Image

Where # is the number of the port.

Onspec Atapi/ide Parallel Port Host Adapter