Command payloads are variable length but are usually multiples of 4 bytes. HID devices communicating with the host operating system. Forget all this crap and focus on the product. Note that the first byte of the payload matches the first byte of the command that prompted the reply. I can not seem to confirm from documentation that I can use one as a slave HID device.

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Transfers whose length is larger than 48 must be padded to a multiple of 64 bytes.

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I can’t give more details due to an NDA, but check out the module: Garbage to satisfy padding rules. The only choice is to purchase someone else’s product which implements the USB device functions you require. Reply packets A reply packet is sent from the device in response to a command packet no reply is sent in response to a buffer fill.

An example are the FTDI chips.

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Not due to technical limitations, but due to the Vendor ID. An msp4300 of this type of packet is shown and described below: Forget all this crap.

One or more examples for both categories are provided. Therefore it can be usb-ecample good choice to select HID as device class, especially if easy-of use is important and achieving the best communication speed is not a requirement.


An example showing the packet extracted from the above data is shown below: Checksum 0xfc4f calculated over command payload. That support has been in PropGCC for ages. Command packets These are used to instruct the device to perform some action. Always 0x83, to indicate a msl430 fill. Anyone seen such a thing? Everyone is trying to make a USB host.

It’s pretty dang close to what I need.

That company will already have their VID, and you’ll just be using their device. There is no reason though that this can’t be incorporated in the current version either, but the cog image can only be reused for buffers code needs to be backed up which would overwrite the source image in EEPROMwhich is a bit of a waste. Those may cause problems for commercial possibilities.

All I want is to be a USB HID slave device

Checksum calculated over payload 0xd89e. Since they are delimeted by 0x7e bytes either side, certain quoting rules must be used for some payloads:.

Destination offset in buffer, little endian 0xb. There are at a more abstract level than USB bus transfers three types of packets that are used to communicate with the device:.


Command packets Command packets are sent to endpoint 0x01 on the device to instruct it to perform some action, or to retrieve information.

When analyzing the report descriptor, the host finds out that it can not exchange information with the device; the device uses a protocol which is meaningless usb-exwmple the HID driver of the host.

However, I’ve never seen this from the eZRF If you usb-exampl “pick one”, you’ll be stepping on someone else’s VID that they paid for.

There is no such thing as a general purpose VID that us small fry can use. And it’s making my head spin pardon the pun. Sign In or Register to comment. I am only vaguely familiar with their hardware, but you should be able to find products of theirs to complete you product.

Oh well, another idea bites the dust.

In this example, the reply is in response to a “get context” command 0x