Custom HID

[bscdb]

Hi,

I'm trying to build a custom HID device. I'm not able to receive any bytes on the host machine (I'm using an HID API). The Nordic board connects to the bluetooth of the computer, but fails to send any data.

Some numbers are displayed when I press SetReport & GetReport buttons.

When I press a button, I can see change in values as per the logic in the event handler.

So is anything missing here?

[Hakon]

Hey,

Have you made any modifications to the HID example code?

[bscdb]

Yes I have attached my main file. There are changes in hids_init and event handler.

[bscdb]

Nope its a keyboard example so I think Windows is not allowing a custom keyboard to send data for security reasons. So I implemented gamepad & I was able to receive the data.

I limited data to 8bits for testing purpose. There is no driver error so bluetooth connects just fine and I get similar results on HID API as pasted above. So is it actually sending data through report? I dont know if the code is working and how I should progress to make it work!

[Hakon]

You should be able to run the keyboard example on most of the newer versions of Windows. If not then you should make sure it works before trying a custom application. What Windows version are you working with?

[bscdb]

I'm working on Windows 10. What kind of data does the keyboard example send?

[Hakon]

Keypresses for the most part. Caps lock information is also sent back to the keyboard device.

[bscdb]

Hi Hakon,

Thankyou for your reply. You are correct it is sending caps on & off information to the host (PC) but does not output a report. But the OUTPUT_REPORT_BIT_MASK_CAPS_LOCK uses the default value in HID table. What if it was an arbitrary value? So instead of caps lock should I keep polling for a value from host and then may be light an led?

Currently I'm able to send arbitrary information to the host using generic HID descriptor (uses vendor defined page). There is no driver issue. I'm also able to connect to the bluetooth of host. But I'm not able to receive data from host. How do I change on_hid_rep_char_write() in order to receive data?

[Hakon]

Have you tried reading *p_evt->params.char_write.data in on_hid_rep_char_write()?

[bscdb]

Thanks Hakon!! Can you tell me how does the host gets the handle of output report? Does it get through the interrupt transfer or control transfer? What have we used in our code?

[Hakon]

What do you mean by handle? I can't find any sort of handle related to output report in the code.