arduino-usbraw/UsbRawHid.hxx

//
// Created by robin on 1/8/16.
//

UsbRawHidDevice UsbRawHid = UsbRawHidDevice();


/* We use a simplifed keyboard report descriptor which does not support the
 * boot protocol. We don't allow setting status LEDs and but we do allow
 * simultaneous key presses.
 * The report descriptor has been created with usb.org's "HID Descriptor Tool"
 * which can be downloaded from http://www.usb.org/developers/hidpage/.
 * Redundant entries (such as LOGICAL_MINIMUM and USAGE_PAGE) have been omitted
 * for the second INPUT item.
 */
PROGMEM const char usbHidReportDescriptor[52] = { /* USB report descriptor, size must match usbconfig.h */
        0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
        0x09, 0x02,                    // USAGE (Mouse)
        0xa1, 0x01,                    // COLLECTION (Application)
        0x09, 0x01,                    //   USAGE (Pointer)
        0xA1, 0x00,                    //   COLLECTION (Physical)
        0x05, 0x09,                    //     USAGE_PAGE (Button)
        0x19, 0x01,                    //     USAGE_MINIMUM
        0x29, 0x03,                    //     USAGE_MAXIMUM
        0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
        0x25, 0x01,                    //     LOGICAL_MAXIMUM (1)
        0x95, 0x03,                    //     REPORT_COUNT (3)
        0x75, 0x01,                    //     REPORT_SIZE (1)
        0x81, 0x02,                    //     INPUT (Data,Var,Abs)
        0x95, 0x01,                    //     REPORT_COUNT (1)
        0x75, 0x05,                    //     REPORT_SIZE (5)
        0x81, 0x03,                    //     INPUT (Const,Var,Abs)
        0x05, 0x01,                    //     USAGE_PAGE (Generic Desktop)
        0x09, 0x30,                    //     USAGE (X)
        0x09, 0x31,                    //     USAGE (Y)
        0x09, 0x38,                    //     USAGE (Wheel)
        0x15, 0x81,                    //     LOGICAL_MINIMUM (-127)
        0x25, 0x7F,                    //     LOGICAL_MAXIMUM (127)
        0x75, 0x08,                    //     REPORT_SIZE (8)
        0x95, 0x03,                    //     REPORT_COUNT (3)
        0x81, 0x06,                    //     INPUT (Data,Var,Rel)
        0xC0,                          //   END_COLLECTION
        0xC0,                          // END COLLECTION
};

UsbRawHidDevice::UsbRawHidDevice()
{
    PORTD = 0; // TODO: Only for USB pins?
    DDRD |= ~USBMASK;

    cli();
    usbDeviceDisconnect();
    usbDeviceConnect();
    usbInit();
    sei();
}

bool UsbRawHidDevice::isUsbReady()
{
    update();
    return usbInterruptIsReady();
}

usbMsgLen_t usbFunctionSetup(uchar data[8])
{
    usbRequest_t    *rq = (usbRequest_t*)(void*)data;

    /* The following requests are never used. But since they are required by
     * the specification, we implement them in this example.
     */
    if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){    /* class request type */
        if(rq->bRequest == USBRQ_HID_GET_REPORT){  /* wValue: ReportType (highbyte), ReportID (lowbyte) */
            /* we only have one report type, so don't look at wValue */
            usbMsgPtr = (unsigned char*)(void *)&UsbRawHid.reportBuffer;
            return sizeof(UsbRawHid.reportBuffer);
        }else if(rq->bRequest == USBRQ_HID_GET_IDLE){
            usbMsgPtr = &idleRate;
            return 1;
        }else if(rq->bRequest == USBRQ_HID_SET_IDLE){
            idleRate = rq->wValue.bytes[1];
        }
    }else{
        /* no vendor specific requests implemented */
    }
    return 0;   /* default for not implemented requests: return no data back to host */
}