Data from Host to device

[bscdb]

Hi,

How do I receive data from host (computer) on my BLE device(Nordic board)? I want to use a simple open source HID API to send data to Nordic board and glow an led or store the data in a buffer & display it using nrf log. How do I do that?

[awneil]

Have you looked at the HID examples in the SDK?

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/examples_ble_peripheral.html?cp=4_0_0_4_1_2

[bscdb]

Let me tell you hid keyboard & mouse example codes do not send any data to HID API. The keys are recognized and alphabet gets printed. I tried this example https://github.com/jayyf/ble_hid_radial_controller, but I'm getting driver error. So how do I fetch data from the host?

[awneil]

bscdb said:

hid keyboard & mouse example codes do not send any data to HID API

That's not what the description of the HID Keyboard Application says:

1. Turn Caps Lock on on the computer. Observe that:
   • BSP_INDICATE_ALERT_3 is indicated.
   • The text 'CAPSON' will be seen on the text editor window on the computer. This verifies that output report characteristic has been written successfully on the HID device.
2. Turn Caps Lock off on the computer. This should result in two events:
   • BSP_INDICATE_ALERT_OFF is indicated.
   • The text 'capsof' will be seen on the editor window.

(actually points 6 & 7 - under 'Testing')

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/ble_sdk_app_hids_keyboard.html?cp=4_0_0_4_1_2_15

And that GitHub repository has this note:

If comment out the macro OUTPUT_REPORT_ENABLE and macro FEATURE_REPORT_ENABLE,the project will only used input report and it will run successfully.

So have you looked at what code is controlled by those macros?

That would be the code that you need ...

[bscdb]

I agree to your points. 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 (HID API) and then may be light an led?