Reenable RawHID

[arunmjayan]

Hi there,
We are thankful for your support, i came here to request you to include the RawHID.h file into the HID-Project.h

[NicoHood]

I am not yet sure why I removed it. I guess because it is not working properly yet. There are several issue about that already open. If you find a way to fix those, I am happy to enable the code again.

[spuder]

Here is one of the issues specifically #133

Currently HID-Project is able to receive data from a PC with RawHID.read() but it is not able to send data back to the PC with RawHID.write()

[NicoHood]

@spuder How can we fix raw hid? I really do not remember the current state. What is needed to make write work properly?

[spuder]

I don't fully understand the bug, but as long as the RawHID sends an array of atleast 64 bytes it works fine.

    // Workaround for bug when sending less than 64 bytes of data
    for (byte i = 0; i < sizeof(rawhidData); i++)
    {
        rawhidData[i] = 0x00;
    }
    RawHID.begin(rawhidData, sizeof(rawhidData));

If you attempt to send an array smaller than 64 bytes, nothing is transferred.

Here is a working example

https://github.com/spuder/MuteMe-arduino/blob/main/src/main.cpp

[NicoHood]

Yeah, I think this has to be because a zero length package is missing or so.

[mcuee]

The current git seems to work reasonaby well based on my testing using the example here.

• Rawhid test device ProMicroRawHID Feature Report Problem todbot/hidapitester#20

There is a bug for the Feature report but the fix is simple.

• RawHID Feature Report not working due to missing Feature Report in the HID Report Descriptor #418