Communication connector using the USB protocol. The resources on this site should not be used as a substitute for professional medical care or advice. Crescent Heart Software. Log in to Reply. Epub Dec

A protocol analyzer decodes, filters, and displays USB data. Some analyzers can also generate data on the bus. Some are software only, while others use hardware that connects to a USB or Ethernet port or a general-purpose logic analyzer. A software-only analyzer can display host driver information but can't display low-level bus information. It's based on an earlier project called USB Snoopy. Free version available. Crescent Heart Software.

For use with a logic analyzer. Prodigy Technovations. USB 2. From Microsoft. No source code. Also demonstrates how to get the serial number and other attributes from a USB flash disk. Source code only. From Emmet Gray. The code looks like the following:. Once this is done you are free to add in whatever methods your device requires. Primarily, these will be methods which communicate to and from the device. In the reference application you have 5 example methods which use the four different communication commands supported by the reference firmware as well as the 5th command which is purely for demonstrating how the class reacts to firmware bugs.

This method deals with interpreting the windows notifications received by the application and seeing if they could relate to the USB device. If they do, then the method starts searching for the USB device, or registers it as detached dependent on the messages received. This method is part of the event mechanism used by the class-library to inform your application of the USB device being attached or detached.

This method is used for incoming bulk data transfers, see the usbReferenceDevice. This method is used to get a single report packet from the USB device. Again, usbReference. This method is used to instruct windows to send device notifications to your application which are then picked up by handleDeviceNotificationMessages for processing.

This method is used for sending commands and data to the USB device. This property can be tested to see if a USB device is present. It has a value of true if the device is attached and false if the device is detached. The C class-library and the reference application are both released under the GPL so you are free to use them and adapt them to your needs. With a complete reference environment and test suite you have everything you need to create your own advanced USB projects.

As with all learning-experiences, start simple and slow and gradually dig deeper in to the way the class-library operates and how Windows applications are created in C. There are endless possibilities for your next hack! I hope to support this soon in an updated version of the library.

Great article and project, thank you. However, I am having a problem. I am building a keyboard encoder on a pic18f and have got it working. The problem is when I try to get the c application to communicate with it.

However your application will not see a usb device. I checked that to see whether the software sees other usb devices by changing the VID and PID and it works with any other USB device, the only one that doesnt work is mine.

Is it perhaps because it is a keyboard device? I am not worried about the tests, just getting it to confirm that it can see the device. It implements a USB keyboard using similar firmware. It should act as a good reference for your project. Ah, I have had a look but my issue is only with the C application communicating with the device, everything else is working perfectly.

Am I missing something or did you misunderstand the issue I was having? USB Generic is only for generic devices. The Vice project is an example of this; sorry, should have been clearer in my response! HIDSharp library connect to device and send messages but it is very simply library and I wanna try library in your project. What is wrong? If it disconnects after attaching then the communication failed the USB device did not respond to the commands sent by the host.

If you are using exactly the code in the project for both the host and the device it may be a bug. Also, turning on debug on the host would probably help you too. You must be logged in to post a comment. If you like this site and want to help support future projects, or you just want to show appreciation for a project you built, used or enjoyed, please consider leaving a PayPal donation.

March 1, at pm. Log in to Reply. Simon Inns says:. March 2, at am. March 2, at pm. March 3, at pm. April 16, at pm. Leave a Reply Cancel reply You must be logged in to post a comment.

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