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

Eras — Tue, 04 May 2021 10:37:35 GMT

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.

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

nxf56274 — Thu, 06 May 2021 02:39:19 GMT

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

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