How to send arbitrary data using on_hid_rep_char_write()?

[bscdb]

Hi,

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? 

In HID keyboard example, 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 (open source HID API) and then may be light an led? 

Please to not divert me to HID keyboard & mouse examples! I need some concrete advise/help beyond those examples.

[Edvin]

Hello,

I know you say you don't want to be diverted to the HID keyboard example, but I will either way, unfortunately.

If I understand you correctly, and please correct me if I don't, you want to be able to receive other inputs than caps lock on or off, right?

Well, if you send a command from the device you are connected to, they to should end up as an event in on_hid_rep_char_write(ble_hids_evt_t * p_evt)

You just need to check your report__val, to check if there is any other data than 0x02 (caps lock on).

What sort of message are you sending to the nRF, and do you get this event when you send it?

Best regards,

Edvin

[bscdb]

Thanks I will check that and get back to you. But can you tell me how does the host get handle of output report? Does it get through the interrupt transfer or control transfer?

[bscdb]

Hi Edvin,

It works!! Thank you so much. Can you help me with 64-bit data? The highlighted values are being sent by me. They are just numbers. What are the other values being appended in input report? 

Below is the log for output report for hid keyboard example. So here values are getting left shifted.

[Edvin]

This is the HID protocol. I don't know what all of the different fields are used for, but you don't need to know that if you use the SDK. See how the example is set up, and how to send different key-presses.

Best regards,

Edvin

[bscdb]

So cant I send 64 bits at a time to the host machine? Is it just 8 bits? Or is it dependent on the descriptor where report count & size are used? 

[Edvin]

No. All these values are the HID protocol way of saying that a button is pressed. I found this fairly easy readable Bluetooth HID profile description:

https://cdn.sparkfun.com/datasheets/Wireless/Bluetooth/RN-HID-User-Guide-v1.0r.pdf

[bscdb]

Thank you Edvin!!