vendor-specific HID combine with USBMouseKeyboard

# 02 Oct 2012

Hi,

I've add the USBHID report descriptor to the tail of USBMouseKeyboard report descriptor with additional report id equal to 4. hidapi's hid_open_path can open, and the output report length of the opened handle is correct, but can not write to mbed. Could anyone help?

Thank you,

Cid

Lexington B.C.

# 03 Oct 2012

Sounds very simmilar to what i first bought my MBED for !

Please keep me up to date.

Cheers

Lex

Samuel Mokrani

# 04 Oct 2012

Hi,

I remember having done the same composite device as yours. The difference is that I did not mix the report descriptors but it was a device with two interfaces.

Quote:

I've add the USBHID report descriptor to the tail of USBMouseKeyboard report descriptor with additional report id equal to 4. hidapi's hid_open_path can open, and the output report length of the opened handle is correct, but can not write to mbed

Do you have the mouse/keyboard device working ?
Are you able to send data from the mbed to the host (over HID) ?

Can you test (I don't have any hardware right now to test) a HID report descriptor where there are two different report ID for input/output reports:

        0x06, 0x00, 0xff,   // usage page (vendor defined)
        0x09, 0x01,         // usage (vendor page 1)
        0xA1, 0x01,         // Collection application
            0x09, 0x01,         // usage (vendor page 1)
        
            0x85, 0x04,         //report id 4
            0x95, input_length, // report count
            0x75, 0x08,         // report size = 8 bits
            0x26, 0xFF, 0x00,   // logical maximum = 255
            0x15, 0x00,         // logical minimum = 0
            0x09, 0x01,         // usage (vendor page 1)
            0x81, 0x02,         // Input (array)
            
            0x85, 0x05,         //report id 5
            0x95, output_length,// report count
            0x75, 0x08,         // report size = 8 bits
            0x26, 0xFF, 0x00,   // logical maximum = 255
            0x15, 0x00,         // logical minimum = 0
            0x09, 0x01,         // usage (vendor page 1)
            0x91, 0x02,         // Output (array)
        0xC0                // end collection

Cheers, Sam

Cid Huang

# 04 Oct 2012

Hi,

Thank you Sam.

With the author of hidapi, I've successfully combine vender-specific hid report descriptor and mouse keyboard report descriptor, and can read/write data through that with hidapi.

After solving the strange phenomenon and successfully demo the prototype, I would share the experience.

Thank you,

Cid

ceri clatworthy

# 04 Oct 2012

Can you share your code pleas,

I would realy like to se this working,

Cheers

Ceri.

Cid Huang

# 12 Oct 2012

I use this:

            USAGE_PAGE(2), LSB(DEFAULT_VENDOR_USAGE_PAGE), MSB(DEFAULT_VENDOR_USAGE_PAGE),
            USAGE(1), 0x04,
            COLLECTION(1), 0x01,                                        // Collection 0x01

                REPORT_ID(1), 0x04,
                REPORT_SIZE(1), 0x08,                                       // report size = 8 bits
                LOGICAL_MINIMUM(1), 0x00,                                   // logical minimum = 0
                LOGICAL_MAXIMUM(2), 0xFF, 0x00,                             // logical maximum = 255

                REPORT_COUNT(1), INPUT_LENGTH,					// report count
                USAGE(1), 0x01,                                             // usage
                INPUT(1), 0x02,                                             // Input (array)

                REPORT_COUNT(1), OUTPUT_LENGTH,					// report count
                USAGE(1), 0x02,                                             // usage
                OUTPUT(1), 0x02,                                            // Output (array)

            END_COLLECTION(0),                                           // end collection

There is a GUI test tool in hidapi named testgui can successful r/w to mbed, the buffer[0] must be ReportID, hence buffer length should add 1.

Cheers,

Cid

HM Yoong

# 21 May 2013

Hi:

I have a few questions

a) Do you have any good recommended URL or book on understanding HID report descriptor format?

b) What is the format and meaning for HID_REPORT in USBKeyboard?

bool USBKeyboard::keyCode(uint8_t key, uint8_t modifier) {
    // Send a simulated keyboard keypress. Returns true if successful.
    HID_REPORT report;

    report.data[0] = REPORT_ID_KEYBOARD;
    report.data[1] = modifier;
    report.data[2] = 0;
    report.data[3] = keymap[key].usage;
    report.data[4] = 0;
    report.data[5] = 0;
    report.data[6] = 0;
    report.data[7] = 0;
    report.data[8] = 0;

    report.length = 9;

    if (!send(&report)) {
        return false;
    }

    report.data[1] = 0;
    report.data[3] = 0;

    if (!send(&report)) {
        return false;
    }

    return true;
}

The reason is that I discovered that: Holding a button to trigger mbed to send a character to a program in PC is different from holding a button on a keyboard to the same program. Text editors do not tell the difference.

I am wondering if there is a method to send a continuous key within a report?

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