File content as of revision 0:1a3aa2e25db9:

#include <mbed.h>

#include "USBControl.h"
//#include "TSISensor.h"

#define VENDOR_ID 0x0004
#define PRODUCT_ID 0x0307
#define PRODUCT_RELEASE 0x0001
#define PRODUCT_NAME "Knob"
#define MANUFACTURER_NAME "Me"
#define WINUSB_GUID "{a451588c-7230-4076-8456-9e544165e90c}"

class USBKnob : public USBControl
{
public:
    USBKnob() : USBControl(VENDOR_ID, PRODUCT_ID, PRODUCT_RELEASE, PRODUCT_NAME, MANUFACTURER_NAME, WINUSB_GUID)
    {
    }
    
    void send(uint32_t fraction)
    {
        sendData(reinterpret_cast<uint8_t*>(&fraction), sizeof(fraction));
    }
};

USBKnob usb;
//TSISensor touch;

DigitalOut red(LED_RED);
DigitalOut green(LED_GREEN);
DigitalOut blue(LED_BLUE);

Serial pc(USBTX, USBRX);

AnalogIn knob(A0);

int main(int argc, char* argv[])
{
    pc.baud(115200);
    pc.printf("\n\n\nmBed WinUSB Knob Example\n");
    red = 1;
    green = 1;
    blue = 1;

    usb.connect();
    
    // Touch sensor example (for FRDM-KL25Z).
//    for (;;)
//    {
//        float f = touch.readPercentage();
//        if (f != 0.0)
//        {
//            // Note that this blocks if no-one is reading it!
//            usb.send(0xFFFFFFFF * f);
//            green = !green;
//            wait_ms(10);
//        }
//    }
    for (;;)
    {
        // TODO: Only send when it changes.
        usb.send(0xFFFFFFFF * knob);
        wait_ms(100);
    }
    return 0;
}