usb_host_hid get string_descriptor[] and report_descriptor[] (IEC-42)

Hi @Postlast,

To get the report descriptor you can use the hid_host_get_report_descriptor call from HID Driver.

    uint8_t *hid_report_buffer;
    size_t hid_report_length = 0;

    ESP_ERROR_CHECK( hid_host_device_open(hid_device_handle, &dev_config) );
    hid_report_buffer = hid_host_get_report_descriptor(hid_device_handle,
                                                &hid_report_length);

    ESP_LOG_BUFFER_HEX(TAG, hid_report_buffer, hid_report_length);

Report descriptor is in raw format. Example of output during the HID Device connection:

I (382) main_task: Returned from app_main()
I (3682) example: HID Device, protocol 'KEYBOARD' CONNECTED
I (3682) example: 05 01 09 06 a1 01 95 08 75 01 15 00 25 01 05 07 
I (3682) example: 19 e0 29 e7 81 02 81 03 95 05 05 08 19 01 29 05 
I (3692) example: 91 02 95 01 75 03 91 01 95 06 75 08 15 00 26 ff 
I (3692) example: 00 05 07 19 00 2a ff 00 81 00 c0 
I (3702) example: HID Device, protocol 'MOUSE' CONNECTED
I (3712) example: 05 01 09 02 a1 01 85 02 09 01 a1 00 95 10 75 01 
I (3712) example: 15 00 25 01 05 09 19 01 29 10 81 02 95 02 75 0c 
I (3722) example: 16 01 f8 26 ff 07 05 01 09 30 09 31 81 06 95 01 
I (3732) example: 75 08 15 81 25 7f 09 38 81 06 95 01 05 0c 0a 38 
I (3732) example: 02 81 06 c0 c0 05 0c 09 01 a1 01 85 03 95 02 75 
I (3742) example: 10 15 01 26 ff 02 19 01 2a ff 02 81 00 c0 05 01 
I (3752) example: 09 80 a1 01 85 04 95 01 75 02 15 01 25 03 09 82 
I (3752) example: 09 81 09 83 81 00 75 06 81 03 c0 06 bc ff 09 88 
I (3762) example: a1 01 85 08 95 01 75 08 15 01 26 ff 00 19 01 29 
I (3772) example: ff 81 00 c0

Unfortunately, right now there is no chance to get serial descriptor easily with the HID Driver, we will add that to the next HID example and HID Host driver update.

I'll close this ticket and update it when the API will be available. Thanks for reporting.

espressif / idf-extra-components

usb_host_hid get string_descriptor[] and report_descriptor[] (IEC-42) #230

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