TM4C123G USB Raw HID

//*****************************************************************************
//
// usbdhidkeyb.c - USB HID Generic device class driver.
//
// Copyright (c) 2008-2014 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
// 
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is not part of revision 2.1.0.12573 of the Tiva USB Library.

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/usb.h"
#include "usblib/usblib.h"
#include "usblib/usblibpriv.h"
#include "usblib/device/usbdevice.h"
#include "usblib/usbhid.h"
#include "usblib/device/usbdhid.h"
#include "usbdhidgeneric.h"

//*****************************************************************************
//
//! \addtogroup hid_Generic_device_class_api
//! @{
//
//*****************************************************************************

//*****************************************************************************
//
// HID device configuration descriptor.
//
// It is vital that the configuration descriptor bConfigurationValue field
// (byte 6) is 1 for the first configuration and increments by 1 for each
// additional configuration defined here.  This relationship is assumed in the
// device stack for simplicity even though the USB 2.0 specification imposes
// no such restriction on the bConfigurationValue values.
//
// Note that this structure is deliberately located in RAM since we need to
// be able to patch some values in it based on client requirements.
//
//*****************************************************************************
static uint8_t g_pui8GenDescriptor[] =
{
    //
    // Configuration descriptor header.
    //
    9,                          // Size of the configuration descriptor.
    USB_DTYPE_CONFIGURATION,    // Type of this descriptor.
    USBShort(41),               // The total size of this full structure. //34
    1,                          // The number of interfaces in this
                                // configuration.
    1,                          // The unique value for this configuration.
    5,                          // The string identifier that describes this
                                // configuration.
    USB_CONF_ATTR_SELF_PWR,     // Bus Powered, Self Powered, remote wake up.
    250,                        // The maximum power in 2mA increments.
};

//*****************************************************************************
//
// The remainder of the configuration descriptor is stored in flash since we
// don't need to modify anything in it at runtime.
//
//*****************************************************************************
static uint8_t g_pui8HIDInterface[HIDINTERFACE_SIZE] =
{
    //
    // HID Device Class Interface Descriptor.
    //
    9,                          // Size of the interface descriptor.
    USB_DTYPE_INTERFACE,        // Type of this descriptor.
    0,                          // The index for this interface.
    0,                          // The alternate setting for this interface.
    2,                          // The number of endpoints used by this
                                // interface.
    USB_CLASS_HID,              // The interface class
    USB_HID_SCLASS_NONE,        // The interface sub-class.
    USB_HID_PROTOCOL_NONE,      // The interface protocol for the sub-class
                                // specified above.
    4,                          // The string index for this interface.
};

static const uint8_t g_pui8HIDInEndpoint[HIDINENDPOINT_SIZE] =
{
    //
    // Interrupt IN endpoint descriptor
    //
    7,                          // The size of the endpoint descriptor.
    USB_DTYPE_ENDPOINT,         // Descriptor type is an endpoint.
    USB_EP_DESC_IN | USBEPToIndex(USB_EP_1),
    USB_EP_ATTR_INT,            // Endpoint is an interrupt endpoint.
    USBShort(USBFIFOSizeToBytes(USB_FIFO_SZ_64)),
                                // The maximum packet size.
    1,                         // The polling interval for this endpoint.
};

static const uint8_t g_pui8HIDOutEndpoint[HIDOUTENDPOINT_SIZE] =
{
    //
    // Interrupt OUT endpoint descriptor
    //
    7,                          // The size of the endpoint descriptor.
    USB_DTYPE_ENDPOINT,         // Descriptor type is an endpoint.
    USB_EP_DESC_OUT | USBEPToIndex(USB_EP_2),
    USB_EP_ATTR_INT,            // Endpoint is an interrupt endpoint.
    USBShort(USBFIFOSizeToBytes(USB_FIFO_SZ_64)),
                                // The maximum packet size.
    1,                         // The polling interval for this endpoint.
};


//*****************************************************************************
//
// The following is the HID report structure definition that is passed back
// to the host.
//
//*****************************************************************************

//*****************************************************************************
//
// The following is the HID report structure definition that is passed back
// to the host.
//
//*****************************************************************************
static const uint8_t g_pui8GenReportDescriptor[] =
{
	    UsagePage(0x00),
	    Usage(0x01),
	    Collection(USB_HID_APPLICATION),

				UsageMinimum(0),     // 19 00
				UsageMaximum(64),    // 29 40
				LogicalMinimum(0),   // 15 00
				LogicalMaximum(255), // 26 FF 00
				ReportSize(8),       // 75 08
				ReportCount(64),     // 95 40
				Input(USB_HID_INPUT_DATA | USB_HID_INPUT_VARIABLE | USB_HID_INPUT_ABS), // 81 00

				UsageMinimum(0),     // 19 00
				UsageMaximum(64),    // 29 40
				LogicalMinimum(0),   // 15 00
				LogicalMaximum(255), // 26 FF 00
				ReportSize(8),       // 75 08
				ReportCount(64),     // 95 40
				Output(USB_HID_OUTPUT_DATA | USB_HID_OUTPUT_VARIABLE | USB_HID_OUTPUT_ABS), // 91 00

		    EndCollection, // C0
};

//*****************************************************************************
//
// The HID descriptor for the Generic device.
//
//*****************************************************************************
static const tHIDDescriptor g_sGenHIDDescriptor =
{
    9,                              // bLength
    USB_HID_DTYPE_HID,              // bDescriptorType
    0x111,                          // bcdHID (version 1.11 compliant)
    0,                              // bCountryCode (not localized)
    1,                              // bNumDescriptors
    {
        {
            USB_HID_DTYPE_REPORT,   // Report descriptor
            sizeof(g_pui8GenReportDescriptor)
                                    // Size of report descriptor
        }
    }
};

//*****************************************************************************
//
// The HID configuration descriptor is defined as four or five sections
// depending upon the client's configuration choice.  These sections are:
//
// 1.  The 9 byte configuration descriptor (RAM).
// 2.  The interface descriptor (RAM).
// 3.  The HID report and physical descriptors (provided by the client)
//     (FLASH).
// 4.  The mandatory interrupt IN endpoint descriptor (FLASH).
// 5.  The optional interrupt OUT endpoint descriptor (FLASH).
//
//*****************************************************************************
static const tConfigSection g_sHIDConfigSection =
{
    sizeof(g_pui8GenDescriptor),
    g_pui8GenDescriptor
};

static const tConfigSection g_sHIDInterfaceSection =
{
    sizeof(g_pui8HIDInterface),
    g_pui8HIDInterface
};

static const tConfigSection g_sHIDInEndpointSection =
{
    sizeof(g_pui8HIDInEndpoint),
    g_pui8HIDInEndpoint
};

static const tConfigSection g_sHIDOutEndpointSection =
{
    sizeof(g_pui8HIDOutEndpoint),
    g_pui8HIDOutEndpoint
};

//*****************************************************************************
//
// Place holder for the user's HID descriptor block.
//
//*****************************************************************************
static tConfigSection g_sHIDDescriptorSection =
{
   sizeof(g_sGenHIDDescriptor),
   (const uint8_t *)&g_sGenHIDDescriptor
};

//*****************************************************************************
//
// This array lists all the sections that must be concatenated to make a
// single, complete HID configuration descriptor.
//
//*****************************************************************************
static const tConfigSection *g_psHIDSections[] =
{
    &g_sHIDConfigSection,
    &g_sHIDInterfaceSection,
    &g_sHIDDescriptorSection,
    &g_sHIDInEndpointSection,
    &g_sHIDOutEndpointSection
};


#define NUM_HID_SECTIONS        ((sizeof(g_psHIDSections) /                   \
                                  sizeof(g_psHIDSections[0]))) // cth++ - 1)


//*****************************************************************************
//
// The header for the single configuration we support.  This is the root of
// the data structure that defines all the bits and pieces that are pulled
// together to generate the configuration descriptor.  Note that this must be
// in RAM since we need to include or exclude the final section based on
// client supplied initialization parameters.
//
//*****************************************************************************
static tConfigHeader g_sHIDConfigHeader =
{
    NUM_HID_SECTIONS,
    g_psHIDSections
};

//*****************************************************************************
//
// Configuration Descriptor.
//
//*****************************************************************************
static const tConfigHeader * const g_ppsHIDConfigDescriptors[] =
{
    &g_sHIDConfigHeader
};

//*****************************************************************************
//
// The HID class descriptor table.  For the Generic class, we have only a
// single report descriptor.
//
//*****************************************************************************
static const uint8_t * const g_pui8GenClassDescriptors[] =
{
    g_pui8GenReportDescriptor
};

//*****************************************************************************
//
// Forward references for Generic device callback functions.
//
//*****************************************************************************
static uint32_t HIDGenRxHandler(void *pvGenDevice, uint32_t ui32Event,
                                     uint32_t ui32MsgData, void *pvMsgData);
static uint32_t HIDGenTxHandler(void *pvGenDevice, uint32_t ui32Event,
                                     uint32_t ui32MsgData, void *pvMsgData);

//*****************************************************************************
//
// Main HID device class event handler function.
//
// \param pvGenericDevice is the event callback pointer provided during
//  USBDHIDInit().This is a pointer to our HID device structure
// (&g_sHIDKeybDevice).
// \param ui32Event identifies the event we are being called back for.
// \param ui32MsgData is an event-specific value.
// \param pvMsgData is an event-specific pointer.
//
// This function is called by the HID device class driver to inform the
// application of particular asynchronous events related to operation of the
// Generic HID device.
//
// \return Returns a value which is event-specific.
//
//*****************************************************************************
static uint32_t
HIDGenRxHandler(void *pvGenDevice, uint32_t ui32Event,
                     uint32_t ui32MsgData, void *pvMsgData)
{
    tHIDGenericInstance *psInst;
    tUSBDHIDGenericDevice *psGenericDevice;

    volatile uint8_t uiTemp; //cth++

    //
    // Make sure we did not get a NULL pointer.
    //
    ASSERT(pvGenDevice);

    //
    // Get a pointer to our instance data
    //
    psGenericDevice = (tUSBDHIDGenericDevice *)pvGenDevice;
    psInst = &psGenericDevice->sPrivateData;

    //
    // Which event were we sent?
    //
    switch (ui32Event)
    {
        //
        // The host has connected to us and configured the device.
        //
        case USB_EVENT_CONNECTED:
        {
            psInst->ui8USBConfigured = true;

            //
            // Pass the information on to the client.
            //
            psGenericDevice->pfnCallback(psGenericDevice->pvCBData,
                                          USB_EVENT_CONNECTED, 0, (void *)0);

            break;
        }

        //
        // The host has disconnected from us.
        //
        case USB_EVENT_DISCONNECTED:
        {
            psInst->ui8USBConfigured = false;

            //
            // Pass the information on to the client.
            //
            psGenericDevice->pfnCallback(psGenericDevice->pvCBData,
                                          USB_EVENT_DISCONNECTED, 0,
                                          (void *)0);

            break;
        }

        //
        // The host is polling us for a particular report and the HID driver
        // is asking for the latest version to transmit.
        //
        case USBD_HID_EVENT_IDLE_TIMEOUT:
        case USBD_HID_EVENT_GET_REPORT:
        {
            //
            // We only support a single input report so we don't need to check
            // the ui32MsgValue parameter in this case.  Set the report pointer
            // in *pvMsgData and return the length of the report in bytes.
            //
            *(uint8_t **)pvMsgData = psInst->pui8Report;
            return(GENERIC_IN_REPORT_SIZE);
        }

        //
        // The device class driver has completed sending a report to the
        // host in response to a Get_Report request.
        //
        case USBD_HID_EVENT_REPORT_SENT:
        {
            //
            // We have nothing to do here.
            //
            break;
        }

        //
        // This event is sent in response to a host Set_Report request.  We
        // must return a pointer to a buffer large enough to receive the
        // report into.
        //
        case USBD_HID_EVENT_GET_REPORT_BUFFER:
        {
            //
            // Are we being asked for a report that is shorter than the storage
            // we have set aside for this?  The only output report we define is
            // 8 bits long so we really expect to see a length of 1 passed.
            //
            if((uint32_t)pvMsgData == GENERIC_OUT_REPORT_SIZE )
            {
                //
                // Yes - return our pointer.
                //
                return((uint32_t)psInst->pui8DataBuffer);
            }
            else
            {
                //
                // We are being passed a report that is longer than the
                // only report we expect so return NULL.  This causes the
                // device class driver to stall the request.
                //
                return(0);
            }
        }

        //
        // This event indicates that the host has sent us an Output or
        // Feature report and that the report is now in the buffer we provided
        // on the previous USBD_HID_EVENT_GET_REPORT_BUFFER callback.
        //
        case USBD_HID_EVENT_SET_REPORT:
        {

                //
                // Pass the information on to the client.
                //
                psGenericDevice->pfnCallback(
                                            psGenericDevice->pvCBData,
                                            USBD_HID_KEYB_EVENT_SET_LEDS,
                                            psInst->pui8DataBuffer[0],
                                            (void *) &psInst->pui8DataBuffer[0]);

            break;
        }

        //
        // The host is asking us to set either boot or report protocol (not
        // that it makes any difference to this particular mouse).
        //
        case USBD_HID_EVENT_SET_PROTOCOL:
        {
            psInst->ui8Protocol = ui32MsgData;
            break;
        }

        //###############cth++
        case USB_EVENT_RX_AVAILABLE:
        {
            //
            // ui32MsgData: the size of recieved data, passed by the stack
            // read out a packet (output report) from the interrupt OUT endpoint
            //
            USBDHIDPacketRead((void *)&(psInst->sHIDDevice), psInst->pui8DataBuffer, ui32MsgData, false);


            //
                  // Pass the information on to the client.
                  //
                  psGenericDevice->pfnCallback(
                                              psGenericDevice->pvCBData,
                                              USB_EVENT_RX_AVAILABLE,
                                              psInst->pui8DataBuffer[0],
                                              (void *) &psInst->pui8DataBuffer[0]);




            //
            // process the output report on psInst->pui8DataBuffer, here
            //
            uiTemp = psInst->pui8DataBuffer[0];

            break;
        }

        //###############cth++


        //
        // The host is asking us to tell it which protocol we are currently
        // using, boot or request.
        //
        case USBD_HID_EVENT_GET_PROTOCOL:
        {
            return(psInst->ui8Protocol);
        }

        //
        // Pass ERROR, SUSPEND and RESUME to the client unchanged.
        //
        case USB_EVENT_ERROR:
        case USB_EVENT_SUSPEND:
        case USB_EVENT_RESUME:
        case USB_EVENT_LPM_RESUME:
        case USB_EVENT_LPM_SLEEP:
        case USB_EVENT_LPM_ERROR:
        {
            return(psGenericDevice->pfnCallback(
                                         psGenericDevice->pvCBData,
                                         ui32Event, ui32MsgData, pvMsgData));
        }

        //
        // We ignore all other events.
        //
        default:
        {
            break;
        }
    }
    return(0);
}

//*****************************************************************************
//
// HID device class transmit channel event handler function.
//
// \param pvGenericDevice is the event callback pointer provided during
// USBDHIDInit().  This is a pointer to our HID device structure
// (&g_sHIDKeybDevice).
// \param ui32Event identifies the event we are being called back for.
// \param ui32MsgData is an event-specific value.
// \param pvMsgData is an event-specific pointer.
//
// This function is called by the HID device class driver to inform the
// application of particular asynchronous events related to report
// transmissions made using the interrupt IN endpoint.
//
// \return Returns a value which is event-specific.
//
//*****************************************************************************
static uint32_t
HIDGenTxHandler(void *pvGenericDevice, uint32_t ui32Event,
                     uint32_t ui32MsgData, void *pvMsgData)
{
    tHIDGenericInstance *psInst;
    tUSBDHIDGenericDevice *psHIDGenDevice;
    tUSBDHIDDevice *psHIDDevice;


    //
    // Make sure we did not get a NULL pointer.
    //
    ASSERT(pvGenericDevice);

    //
    // Get a pointer to our instance data
    //
    psHIDGenDevice = (tUSBDHIDGenericDevice *)pvGenericDevice;
    psInst = &psHIDGenDevice->sPrivateData;
    psHIDDevice = &psInst->sHIDDevice;

    //
    // Which event were we sent?
    //
    switch (ui32Event)
    {
        //
        // A report transmitted via the interrupt IN endpoint was acknowledged
        // by the host.
        //
        case USB_EVENT_TX_COMPLETE:
        {
             //
                // Yes - go ahead and send another report immediately.
                //
                USBDHIDReportWrite((void *)psHIDDevice,
                                             psInst->pui8Report,
                                             GENERIC_IN_REPORT_SIZE, true);



            //
            // Pass the event on to the client.
            //
            psHIDGenDevice->pfnCallback(psHIDGenDevice->pvCBData,
                                       USB_EVENT_TX_COMPLETE, ui32MsgData,
                                       (void *)0);

            break;
        }

        //
        // We ignore all other events related to transmission of reports via
        // the interrupt IN endpoint.
        //
        default:
        {
            break;
        }
    }

    return(0);
}


//*****************************************************************************
//
//! Initializes HID Generic device operation for a given USB controller.
//!
//! \param ui32Index is the index of the USB controller which is to be
//! initialized for HID Generic device operation.
//! \param psHIDKbDevice points to a structure containing parameters
//! customizing the operation of the HID Generic device.
//!
//! An application wishing to offer a USB HID Generic interface to a USB host
//! must call this function to initialize the USB controller and attach the
//! Generic device to the USB bus.  This function performs all required USB
//! initialization.
//!
//! On successful completion, this function returns the \e psHIDKbDevice
//! pointer passed to it.  This must be passed on all future calls to the HID
//! Generic device driver.
//!
//! When a host connects and configures the device, the application callback
//! receives \b USB_EVENT_CONNECTED after which calls can be made to
//! USBDHIDGenericKeyStateChange() to report key presses and releases to the
//! USB host.
//!
//! \note The application must not make any calls to the lower level USB device
//! interfaces if interacting with USB via the USB HID Generic device class
//! API.  Doing so causes unpredictable (though almost certainly
//! unpleasant) behavior.
//!
//! \return Returns NULL on failure or the \e psHIDKbDevice pointer on success.
//
//*****************************************************************************

tUSBDHIDGenericDevice *
USBDHIDGenericInit(uint32_t ui32Index, tUSBDHIDGenericDevice *psHIDGenDevice)
{
    void *pvRetcode;
    tUSBDHIDDevice *psHIDDevice;
    tConfigDescriptor *pConfigDesc;

    //
    // Check parameter validity.
    //
    ASSERT(psHIDGenDevice);
    ASSERT(psHIDGenDevice->ppui8StringDescriptors);
    ASSERT(psHIDGenDevice->pfnCallback);

    //
    // Get a pointer to the HID device data.
    //
    psHIDDevice = &psHIDGenDevice->sPrivateData.sHIDDevice;

    //
    // Call the common initialization routine.
    //
    pvRetcode = USBDHIDGenericCompositeInit(ui32Index, psHIDGenDevice, 0);

    pConfigDesc = (tConfigDescriptor *)g_pui8GenDescriptor;
    pConfigDesc->bmAttributes = psHIDGenDevice->ui8PwrAttributes;
    pConfigDesc->bMaxPower =  (uint8_t)(psHIDGenDevice->ui16MaxPowermA / 2);

    //
    // If we initialized the HID layer successfully, pass our device pointer
    // back as the return code, otherwise return NULL to indicate an error.
    //
    if(pvRetcode)
    {
        //
        // Initialize the lower layer HID driver and pass it the various
        // structures and descriptors necessary to declare that we are a
        // Generic.
        //
        pvRetcode = USBDHIDInit(ui32Index, psHIDDevice);

        return((void *)psHIDGenDevice);
    }
    else
    {
        return((void *)0);
    }
}



//*****************************************************************************
//
//! Initializes HID Generic device operation for a given USB controller.
//!
//! \param ui32Index is the index of the USB controller which is to be
//! initialized for HID Generic device operation.
//! \param psHIDKbDevice points to a structure containing parameters
//! customizing the operation of the HID Generic device.
//! \param psCompEntry is the composite device entry to initialize when
//! creating a composite device.
//!
//! This call is very similar to USBDHIDGenericInit() except that it is used
//! for initializing an instance of the HID Generic device for use in a
//! composite device.  If this HID Generic is part of a composite device, then
//! the \e psCompEntry should point to the composite device entry to
//! initialize. This is part of the array that is passed to the
//! USBDCompositeInit() function.
//!
//! \return Returns zero on failure or a non-zero instance value that should be
//! used with the remaining USB HID Generic APIs.
//
//*****************************************************************************

tUSBDHIDGenericDevice *
USBDHIDGenericCompositeInit(uint32_t ui32Index,
                             tUSBDHIDGenericDevice *psHIDGenDevice,
                             tCompositeEntry *psCompEntry)
{
    tHIDGenericInstance *psInst;

    tUSBDHIDDevice *psHIDDevice;

    //
    // Check parameter validity.
    //
    ASSERT(psHIDGenDevice);
    ASSERT(psHIDGenDevice->ppui8StringDescriptors);
    ASSERT(psHIDGenDevice->pfnCallback);

    //
    // Get a pointer to our instance data
    //
    psInst = &psHIDGenDevice->sPrivateData;

    //
    // Initialize the various fields in our instance structure.
    //
    psInst->ui8USBConfigured = 0;
    psInst->ui8Protocol = USB_HID_PROTOCOL_REPORT;
    psInst->sReportIdle.ui8Duration4mS = 125;
    psInst->sReportIdle.ui8ReportID = 0;
    psInst->sReportIdle.ui32TimeSinceReportmS = 0;
    psInst->sReportIdle.ui16TimeTillNextmS = 0;
    psInst->eGenericState = HID_GENERIC_STATE_UNCONFIGURED;

    //
    // Get a pointer to the HID device data.
    //
    psHIDDevice = &psInst->sHIDDevice;

    //
    // Initialize the HID device class instance structure based on input from
    // the caller.
    //
    psHIDDevice->ui16PID = psHIDGenDevice->ui16PID;
    psHIDDevice->ui16VID = psHIDGenDevice->ui16VID;
    psHIDDevice->ui16MaxPowermA = psHIDGenDevice->ui16MaxPowermA;
    psHIDDevice->ui8PwrAttributes = psHIDGenDevice->ui8PwrAttributes;
    psHIDDevice->ui8Subclass = USB_HID_SCLASS_NONE;
    psHIDDevice->ui8Protocol = USB_HID_PROTOCOL_NONE;
    psHIDDevice->ui8NumInputReports = 1;
    psHIDDevice->psReportIdle = 0;
    psHIDDevice->pfnRxCallback = HIDGenRxHandler;
    psHIDDevice->pvRxCBData = (void *)psHIDGenDevice;
    psHIDDevice->pfnTxCallback = HIDGenTxHandler;
    psHIDDevice->pvTxCBData = (void *)psHIDGenDevice;
    psHIDDevice->bUseOutEndpoint = false,

    psHIDDevice->psHIDDescriptor = &g_sGenHIDDescriptor;
    psHIDDevice->ppui8ClassDescriptors = g_pui8GenClassDescriptors;
    psHIDDevice->ppui8StringDescriptors =
                                        psHIDGenDevice->ppui8StringDescriptors;
    psHIDDevice->ui32NumStringDescriptors =
                                        psHIDGenDevice->ui32NumStringDescriptors;
    psHIDDevice->ppsConfigDescriptor = g_ppsHIDConfigDescriptors;

    psHIDDevice->psReportIdle = &psInst->sReportIdle;

    //
    // Initialize the lower layer HID driver and pass it the various structures
    // and descriptors necessary to declare that we are a Generic.
    //
    return(USBDHIDCompositeInit(ui32Index, psHIDDevice, psCompEntry));
}

//*****************************************************************************
//
//! Shuts down the HID Generic device.
//!
//! \param pvGenericDevice is the pointer to the device instance structure
//! as returned by USBDHIDGenericInit().
//!
//! This function terminates HID Generic operation for the instance supplied
//! and removes the device from the USB bus.  Following this call, the
//! \e pvGenericDevice instance may not me used in any other call to the HID
//! Generic device other than USBDHIDGenericInit().
//!
//! \return None.
//
//*****************************************************************************
void
USBDHIDGenericTerm(void *pvGenericDevice)
{
    tUSBDHIDGenericDevice *psHIDGenDevice;
    tUSBDHIDDevice *psHIDDevice;

    ASSERT(pvGenericDevice);

    //
    // Get a pointer to the device.
    //
    psHIDGenDevice = (tUSBDHIDGenericDevice *)pvGenericDevice;

    //
    // Get a pointer to the HID device data.
    //
    psHIDDevice = &psHIDGenDevice->sPrivateData.sHIDDevice;

    //
    // Mark the device as no longer configured.
    //
    psHIDGenDevice->sPrivateData.ui8USBConfigured = 0;

    //
    // Terminate the low level HID driver.
    //
    USBDHIDTerm(psHIDDevice);
}

//*****************************************************************************
//
//! Sets the client-specific pointer parameter for the Generic callback.
//!
//! \param pvGenericDevice is the pointer to the device instance structure
//! as returned by USBDHIDGenericInit().
//! \param pvCBData is the pointer that client wishes to be provided on each
//! event sent to the Generic callback function.
//!
//! The client uses this function to change the callback pointer passed in
//! the first parameter on all callbacks to the \e pfnCallback function
//! passed on USBDHIDGenericInit().
//!
//! If a client wants to make runtime changes in the callback pointer, it must
//! ensure that the \e pvGenericDevice structure passed to
//! USBDHIDGenericInit() resides in RAM.  If this structure is in flash,
//! callback data changes is not possible.
//!
//! \return Returns the previous callback pointer that was set for this
//! instance.
//
//*****************************************************************************
void *
USBDHIDGenericSetCBData(void *pvGenericDevice, void *pvCBData)
{
    void *pvOldCBData;
    tUSBDHIDGenericDevice *psGeneric;

    //
    // Check for a NULL pointer in the device parameter.
    //
    ASSERT(pvGenericDevice);

    //
    // Get a pointer to our Generic device.
    //
    psGeneric = (tUSBDHIDGenericDevice *)pvGenericDevice;

    //
    // Save the old callback pointer and replace it with the new value.
    //
    pvOldCBData = psGeneric->pvCBData;
    psGeneric->pvCBData = pvCBData;

    //
    // Pass the old callback pointer back to the caller.
    //
    return(pvOldCBData);
}

//*****************************************************************************
//
//! Reports a key state change to the USB host.
//!
//! \param pvGenericDevice is the pointer to the device instance structure
//! as returned by USBDHIDGenericInit().
//! \param ui8Modifiers contains the states of each of the Generic modifiers
//! (left/right shift, ctrl, alt or GUI keys).  Valid values are logical OR
//! combinations of the labels \b HID_KEYB_LEFT_CTRL, \b HID_KEYB_LEFT_SHIFT,
//! \b HID_KEYB_LEFT_ALT, \b HID_KEYB_LEFT_GUI, \b HID_KEYB_RIGHT_CTRL, \b
//! HID_KEYB_RIGHT_SHIFT, \b HID_KEYB_RIGHT_ALT and \b HID_KEYB_RIGHT_GUI.
//! Presence of one of these bit flags indicates that the relevant modifier
//! key is pressed and absence indicates that it is released.
//! \param ui8UsageCode is the usage code of the key whose state has changed.
//! If only modifier keys have changed, \b HID_KEYB_USAGE_RESERVED should be
//! passed in this parameter.
//! \param bPress is \b true if the key has been pressed or \b false if it has
//! been released.  If only modifier keys have changed state, this parameter is
//! ignored.
//!
//! This function adds or removes a key usage code from the list of keys
//! currently pressed and schedules a report transmission to the host to
//! inform it of the new Generic state.  If the maximum number of simultaneous
//! key presses are already recorded, the report to the host contains the
//! rollover error code, \b HID_KEYB_USAGE_ROLLOVER instead of key usage codes
//! and the caller receives return code \b KEYB_ERR_TOO_MANY_KEYS.
//!
//! \return Returns \b KEYB_SUCCESS if the key usage code was added to or
//! removed from the current list successfully.  \b KEYB_ERR_TOO_MANY_KEYS is
//! returned if an attempt is made to press a 7th key (the BIOS Generic
//! protocol can report no more than 6 simultaneously pressed keys).  If called
//! before the USB host has configured the device, \b KEYB_ERR_NOT_CONFIGURED
//! is returned and, if an error is reported while attempting to transmit the
//! report, \b KEYB_ERR_TX_ERROR is returned.  If an attempt is made to remove
//! a key from the pressed list (by setting parameter \e bPressed to \b false)
//! but the key usage code is not found, \b KEYB_ERR_NOT_FOUND is returned.
//
//*****************************************************************************

uint32_t
USBDHIDSendData(void *pvGenericDevice, uint8_t * buffer)
{
    uint32_t ui32Loop, ui32Count;
    tHIDGenericInstance *psInst;
    tUSBDHIDGenericDevice *psHIDGenDevice;
    tUSBDHIDDevice *psHIDDevice;

    psHIDGenDevice = (tUSBDHIDGenericDevice *)pvGenericDevice;

    //
    // Get a pointer to the HID device data.
    //
    psHIDDevice = &psHIDGenDevice->sPrivateData.sHIDDevice;

    //
    // Get a pointer to our instance data
    //
    psInst = &psHIDGenDevice->sPrivateData;

    //
	// Build the report from the current list of keys.  If we added a key
	// and got a bad return code indicating a roll over error, we need to
	// send a roll over report
	//
	for(ui32Loop = 0; ui32Loop < GENERIC_OUT_REPORT_SIZE; ui32Loop++)
	{
		psInst->pui8Report[ui32Loop] = buffer[ui32Loop];
	}


    //
    // If we are not configured, return an error here before trying to send
    // anything.
    //
    if(!psInst->ui8USBConfigured)
    {
        return(KEYB_ERR_NOT_CONFIGURED);
    }

    //
    // Only send a report if the transmitter is currently free.
    //
    if(USBDHIDTxPacketAvailable((void *)psHIDDevice))
    {
        //
        // Send the report to the host.
        //
        psInst->eGenericState = HID_GENERIC_STATE_SEND;
        ui32Count = USBDHIDReportWrite((void *)psHIDDevice,
                                       psInst->pui8Report, GENERIC_IN_REPORT_SIZE,
                                       true);

        //
        // Did we schedule a packet for transmission correctly?
        //
        if(!ui32Count)
        {
            //
            // No - report the error to the caller.
            //
            return(KEYB_ERR_TX_ERROR);
        }
    }
    else
    {
        //
        // We can't send the report immediately so mark the instance so that
        // it is sent next time the transmitter is free.
        //
        //psInst->bChangeMade = true;
    }

    //
    // If we get this far, the key information was sent successfully.  Are
    // too many keys currently pressed, though?
    //
    return(KEYB_SUCCESS);
}


#ifndef DEPRECATED

//*****************************************************************************
//
//! Reports the device power status (bus or self powered) to the USB library.
//!
//! \param pvGenericDevice is the pointer to the Generic device instance
//! structure.
//! \param ui8Power indicates the current power status, either
//! \b USB_STATUS_SELF_PWR or \b USB_STATUS_BUS_PWR.
//!
//! Applications which support switching between bus or self powered
//! operation should call this function whenever the power source changes
//! to indicate the current power status to the USB library.  This information
//! is required by the USB library to allow correct responses to be provided
//! when the host requests status from the device.
//!
//! \return None.
//
//*****************************************************************************
void
USBDHIDGenericPowerStatusSet(void *pvGenericDevice, uint8_t ui8Power)
{
    tUSBDHIDGenericDevice *psHIDKbDevice;
    tUSBDHIDDevice *psHIDDevice;

    ASSERT(pvGenericDevice);

    //
    // Get the Generic device pointer.
    //
    psHIDKbDevice = (tUSBDHIDGenericDevice *)pvGenericDevice;

    //
    // Get a pointer to the HID device data.

    psHIDDevice = &psHIDKbDevice->sPrivateData.sHIDDevice;

    //
    // Pass the request through to the lower layer.
    //
    USBDHIDPowerStatusSet((void *)psHIDDevice, ui8Power);
}
#endif

//*****************************************************************************
//
//! Requests a remote wake up to resume communication when in suspended state.
//!
//! \param pvGenericDevice is the pointer to the Generic device instance
//! structure.
//!
//! When the bus is suspended, an application which supports remote wake up
//! (advertised to the host via the configuration descriptor) may call this
//! function to initiate remote wake up signaling to the host.  If the remote
//! wake up feature has not been disabled by the host, this causes the bus
//! to resume operation within 20mS.  If the host has disabled remote wake up,
//! \b false is returned to indicate that the wake up request was not
//! successful.
//!
//! \return Returns \b true if the remote wake up is not disabled and the
//! signaling was started or \b false if remote wake up is disabled or if
//! signaling is currently ongoing following a previous call to this function.
//
//*****************************************************************************
bool
USBDHIDGenericRemoteWakeupRequest(void *pvGenericDevice)
{
    tUSBDHIDGenericDevice *psHIDKbDevice;
    tUSBDHIDDevice *psHIDDevice;

    ASSERT(pvGenericDevice);

    //
    // Get the Generic device pointer.
    //
    psHIDKbDevice = (tUSBDHIDGenericDevice *)pvGenericDevice;

    //
    // Get a pointer to the HID device data.
    //
    psHIDDevice = &psHIDKbDevice->sPrivateData.sHIDDevice;

    //
    // Pass the request through to the lower layer.
    //
    return(USBDHIDRemoteWakeupRequest((void *)psHIDDevice));
}

//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************