USB HID Report ID - KL27Z / KL25Z / Kinetis - generic hid example

[Eras]

Problem regarding getting the USB HID generic example to work with a report id.

I started a new empty project with the "KL27Z" SDK and initialzied the USB Middleware via the "Config Tool". There I selected the generic HID example and just shorted the descriptor a little bit.

This is how my descriptor looks like:

uint8_t g_UsbDeviceInterface0HidGenericReportDescriptor[] = {
    0x05U, 0x81U,  /* Usage Page (Vendor defined) */ 
    0x09U, 0x82U,  /* Usage (Vendor defined) */ 
    0xA1U, 0x01U,  /* Collection (Application) */ 
    0x09U, 0x01U,  /* Usage (Vendor defined) */ 
    0x15U, 0x00U,  /* Logical Minimum (0) */ 
    0x26U, 0xFFU, 0x00U,  /* Logical Maximum (255) */ 
    0x75U, 0x08U,  /* Report Size (8U) */ 
    0x95U, 0x08U,  /* Report Count (8U) */ 
    0x81U, 0x02U,  /* Input(Data, Variable, Absolute) */ 
    0x09U, 0x01U,  /* Usage (Vendor defined) */ 
    0x91U, 0x02U,  /* Output(Data, Variable, Absolute) */ 
    0xC0U,  /* End collection, */ 
};

And I just used the example code to return the received values to the host:

static usb_status_t USB_DeviceHidGenericAction(void)
{
    for (int i = 0; i < USB_INTERFACE_0_HID_GENERIC_OUTPUT_REPORT_LENGTH; i++)

    {
        s_UsbDeviceHidGeneric.inBuffer[i] = s_UsbDeviceHidGeneric.outBuffer[i];
    }

    USB_DeviceHidSend(s_UsbDeviceComposite->interface0HidGenericHandle, USB_INTERFACE_0_HID_GENERIC_SETTING_0_EP_1_INTERRUPT_IN,
        (uint8_t *)s_UsbDeviceHidGeneric.inBuffer,
        USB_INTERFACE_0_HID_GENERIC_INPUT_REPORT_LENGTH);

    return USB_DeviceHidRecv(s_UsbDeviceComposite->interface0HidGenericHandle, USB_INTERFACE_0_HID_GENERIC_SETTING_0_EP_1_INTERRUPT_OUT,
        (uint8_t *)s_UsbDeviceHidGeneric.outBuffer,
        USB_INTERFACE_0_HID_GENERIC_OUTPUT_REPORT_LENGTH);
}


usb_status_t USB_DeviceInterface0HidGenericCallback(class_handle_t handle, uint32_t event, void *param)
{
    usb_status_t error = kStatus_USB_Error;

    switch (event)
    {
        case kUSB_DeviceHidEventSendResponse:
            break;
        case kUSB_DeviceHidEventRecvResponse:
            if (s_UsbDeviceComposite->attach)
            {
                return USB_DeviceHidGenericAction();
            }
            break;
        case kUSB_DeviceHidEventGetReport:
        case kUSB_DeviceHidEventSetReport:
        case kUSB_DeviceHidEventRequestReportBuffer:
            error = kStatus_USB_InvalidRequest;
            break;
        case kUSB_DeviceHidEventGetIdle:
        case kUSB_DeviceHidEventGetProtocol:
        case kUSB_DeviceHidEventSetIdle:
        case kUSB_DeviceHidEventSetProtocol:
            break;
        default:
            break;
    }

    return error;
}

I confirmed that it works with a small python script.

Then i wanted to change it so I that the report uses a report id.
I changed the descriptor and it now looks like this:

uint8_t g_UsbDeviceInterface0HidGenericReportDescriptor[] = {
    0x05U, 0x81U,  /* Usage Page (Vendor defined) */ 
    0x09U, 0x82U,  /* Usage (Vendor defined) */ 
    0xA1U, 0x01U,  /* Collection (Application) */ 
    0x09U, 0x01U,  /* Usage (Vendor defined) */ 
    0x85U, 0x02U,  /* Report ID (2) */
    0x15U, 0x00U,  /* Logical Minimum (0) */ 
    0x26U, 0xFFU, 0x00U,  /* Logical Maximum (255) */ 
    0x75U, 0x08U,  /* Report Size (8U) */ 
    0x95U, 0x08U,  /* Report Count (8U) */ 
    0x81U, 0x02U,  /* Input(Data, Variable, Absolute) */ 
    0x09U, 0x01U,  /* Usage (Vendor defined) */ 
    0x91U, 0x02U,  /* Output(Data, Variable, Absolute) */ 
    0xC0U,  /* End collection, */ 
};

But now the devices does not send back the bytes when I run the python script.
If I set a breakpoint in the "USB_DeviceHidGenericAction()" function it stops there and calls the "USB_DeviceHidSend()" function.

Do I have to insert the report id somwhere in the message and how would I do it.
I tried to just set s_UsbDeviceHidGeneric.inBuffer[0] to the report id but that didn't worked.

I'm new to this, never done something with USB before and the SDK is really overwhelming.

Help would be appreciated.

[nxf56274]

Hi,

Please refer this link. hid-reporter

BTW, you can use hid descriptor to generate the reporter. You can download here. hid_descriptor_tool

Have a great day,
TIC

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