hiddfunctiondriver.c

本代bootloader通过usb下载代码首先存放在sdram中

    // Restart transfer
    USBD_Read(HIDD_Descriptors_INTERRUPTOUT,
              &(hiddKeyboardDriver.outputReport),
              sizeof(HIDDKeyboardOutputReport),
              (TransferCallback) HIDD_ReportReceived,
              0); // No argument for callback function
}

//-----------------------------------------------------------------------------
/// Retrieves the new value of a report from the host and saves it.
/// \param type Report type.
/// \param length Report length.
//-----------------------------------------------------------------------------
static void HIDD_SetReport(unsigned char type,
                           unsigned short length)
{
    TRACE_INFO_WP("sReport ");

    // Check report type
    switch (type) {
    
        case HIDReportRequest_INPUT:
            // SET_REPORT requests on input reports are ignored
            USBD_Stall(0);
            break;

        case HIDReportRequest_OUTPUT:
            // Check report length
            if (length != sizeof(HIDDKeyboardOutputReport)) {

                USBD_Stall(0);
            }
            else {
            
                USBD_Read(0, // Endpoint #0
                          &(hiddKeyboardDriver.outputReport),
                          length,
                          (TransferCallback) HIDD_ReportReceived,
                          0); // No argument to the callback function
            }
            break;

        default:
            USBD_Stall(0);
    }
}

//-----------------------------------------------------------------------------
//         Exported functions
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
/// Initializes an USB HID keyboard function driver.
/// \param pUsbdDriver Pointer to the USB driver instance.
//-----------------------------------------------------------------------------
void HIDDFunctionDriver_Initialize(USBDDriver * pUsbdDriver)
{
    hiddKeyboardDriver.inputReportIdleRate = 0;
    HIDDKeyboardInputReport_Initialize(&(hiddKeyboardDriver.inputReport));
    HIDDKeyboardOutputReport_Initialize(&(hiddKeyboardDriver.outputReport));

    hiddKeyboardDriver.pUsbdDriver = pUsbdDriver;
}

//-----------------------------------------------------------------------------
/// Handles HID-specific SETUP request sent by the host.
/// \param request Pointer to a USBGenericRequest instance.
/// \return 0 if the request is Unsupported, 1 if the request handled.
//-----------------------------------------------------------------------------
unsigned char HIDDFunctionDriver_RequestHandler(
    const USBGenericRequest *request)
{
    TRACE_INFO_WP("NewReq ");

    // Check if this is a standard request
    if (USBGenericRequest_GetType(request) == USBGenericRequest_STANDARD) {

        // This is a standard request
        switch (USBGenericRequest_GetRequest(request)) {
        
            case USBGenericRequest_GETDESCRIPTOR:
                // Check if this is a HID descriptor, otherwise forward it to
                // the standard driver
                if (!HIDD_GetDescriptor(
                        USBGetDescriptorRequest_GetDescriptorType(request),
                        USBGenericRequest_GetLength(request))) {

                    USBDDriver_RequestHandler(hiddKeyboardDriver.pUsbdDriver,
                                              request);
                }
                break;

            default:
                return 0;
        }
    }
    // Check if this is a class request
    else if (USBGenericRequest_GetType(request) == USBGenericRequest_CLASS) {

        // This is a class-specific request
        switch (USBGenericRequest_GetRequest(request)) {

            case HIDGenericRequest_GETIDLE:
                HIDD_GetIdle();
                break;

            case HIDGenericRequest_SETIDLE:
                HIDD_SetIdle(HIDIdleRequest_GetIdleRate(request));
                break;

            case HIDGenericRequest_GETREPORT:
                HIDD_GetReport(
                    HIDReportRequest_GetReportType(request),
                    USBGenericRequest_GetLength(request));
                break;

            case HIDGenericRequest_SETREPORT:
                HIDD_SetReport(
                    HIDReportRequest_GetReportType(request),
                    USBGenericRequest_GetLength(request));
                break;

            default:
                return 0;
        }
    }
    return 1;
}

//-----------------------------------------------------------------------------
/// Invoked whenever the configuration of the device is changed by the host.
/// \param cfgnum Newly configuration number.
//-----------------------------------------------------------------------------
void HIDDFunctionCallbacks_ConfigurationChanged(unsigned char cfgnum)
{
    if (cfgnum > 0) {
    
        // Start receiving output reports
        USBD_Read(HIDD_Descriptors_INTERRUPTOUT,
                  &(hiddKeyboardDriver.outputReport),
                  sizeof(HIDDKeyboardOutputReport),
                  (TransferCallback) HIDD_ReportReceived,
                  0); // No argument for callback function
    }
}

//-----------------------------------------------------------------------------
/// Reports a change in which keys are currently pressed or release to the
/// host.
/// \param pressedKeys Pointer to an array of key codes indicating keys that
///         have been pressed since the last call to
///         <HIDDKeyboardDriver_ChangeKeys>.
/// \param pressedKeysSize Number of key codes in the pressedKeys array.
/// \param releasedKeys Pointer to an array of key codes indicates keys that
///         have been released since the last call to
///         <HIDDKeyboardDriver_ChangeKeys>.
/// \param releasedKeysSize Number of key codes in the releasedKeys array.
/// \return <USBD_STATUS_SUCCESS> if the report has been sent to the host;
///         otherwise an error code.
//-----------------------------------------------------------------------------
unsigned char HIDDKeyboardDriver_ChangeKeys(unsigned char *pressedKeys,
                                            unsigned char pressedKeysSize,
                                            unsigned char *releasedKeys,
                                            unsigned char releasedKeysSize)
{
    // Press keys
    while (pressedKeysSize > 0) {

        // Check if this is a standard or modifier key
        if (HIDKeypad_IsModifierKey(*pressedKeys)) {

            // Set the corresponding bit in the input report
            HIDDKeyboardInputReport_PressModifierKey(
                &(hiddKeyboardDriver.inputReport),
                *pressedKeys);
        }
        else {

            HIDDKeyboardInputReport_PressStandardKey(
                &(hiddKeyboardDriver.inputReport),
                *pressedKeys);
        }

        pressedKeysSize--;
        pressedKeys++;
    }

    // Release keys
    while (releasedKeysSize > 0) {

        // Check if this is a standard or modifier key
        if (HIDKeypad_IsModifierKey(*releasedKeys)) {

            // Set the corresponding bit in the input report
            HIDDKeyboardInputReport_ReleaseModifierKey(
                &(hiddKeyboardDriver.inputReport),
                *releasedKeys);
        }
        else {

            HIDDKeyboardInputReport_ReleaseStandardKey(
                &(hiddKeyboardDriver.inputReport),
                *releasedKeys);
        }

        releasedKeysSize--;
        releasedKeys++;
    }

    // Send input report through the interrupt IN endpoint
    return USBD_Write(HIDD_Descriptors_INTERRUPTIN,
                      &(hiddKeyboardDriver.inputReport),
                      sizeof(HIDDKeyboardInputReport),
                      0,
                      0);
}

//-----------------------------------------------------------------------------
/// Starts a remote wake-up sequence if the host has explicitely enabled it
/// by sending the appropriate SET_FEATURE request.
//-----------------------------------------------------------------------------
void HIDDKeyboardDriver_RemoteWakeUp(void)
{
    // Remote wake-up has been enabled
    if (USBDDriver_IsRemoteWakeUpEnabled(hiddKeyboardDriver.pUsbdDriver)) {

        USBD_RemoteWakeUp();
    }
}

#endif