USB HID Keyboard

[mm784]

Hello,

I would like to implement a simple USB HID Keyboard application on nRF52840 or nRF5340, where a button press on the dev kit sends an HID key over USB. I am using the nRF Connect SDK. It has a USB HID Mouse sample application, but I couldn't find a USB HID sample. I only found a BLE HID Keyboard version but I need a USB HID Keyboard. Does such a sample or example project exist? Any insight will be much appreciated. 

Thanks

[Kenneth]

Hello,

Check out the USB CDC example, which include both CDC, HID keyboard and HID mouse, ref:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/subsys/usb/hid-cdc/README.html  

For instance you can see it says:

Welcome to CDC_ACM_1
Enter a string and terminate it with ENTER.
It will be sent via HID when BUTTON 2 is pressed.
You can modify it by sending a new one here.

Which means that any character received over the serial port will be fordwarded through the HID keyboard descriptor each time button 2 is pressed. The source include the HID keyboard descriptor as seen in the source:

static const uint8_t hid_kbd_report_desc[] = HID_KEYBOARD_REPORT_DESC(); 

https://github.com/nrfconnect/sdk-zephyr/blob/main/samples/subsys/usb/hid-cdc/src/main.c#L131  

Kenneth