while (byte_count1 < 8)									//FIF0 is only 8 bytes long
	{
		ENDPOINT_A0_FIFO[byte_count1++] = *(XmtBuff.p);		//move data into FIFO
		XmtBuff.p++;
		if (!--XmtBuff.bLength)								//if we have exhausted the data, quit
			break;
	}
	return(byte_count1);										//returns the number of bytes loaded
}


/*
**
** FUNCTION:		SetConfiguration
**
** PURPOSE:			Implements the Set Configuration Command
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered Set Configuration request has been received from the host.
**					
*/

void SetConfiguration(void)
{
    if ( (ENDPOINT_A0_FIFO[USB_bmRequestType] == (HOST_TO_DEVICE | STANDARD | DEVICE)) &&
		 ((ENDPOINT_A0_FIFO[USB_wValue] == UNCONFIGURED) || (ENDPOINT_A0_FIFO[USB_wValue] == CONFIGURED) ))
    {
        DeviceStatus.bConfiguration = ENDPOINT_A0_FIFO[USB_wValue];			//set the configuration 
        DeviceStatus.bEP1Stall = 0;											//and clear EP1 stall	
        EP_A1_COUNTER &= ~DATATOGGLE;										//clear EP1's data toggle
        if(DeviceStatus.bConfiguration == UNCONFIGURED)
			EP_A1_MODE = USB_MODE_DISABLE;									//not configured -- disable EP1 from responding
        else
 			EP_A1_MODE = USB_MODE_NAK_IN;									//configured -- NAK traffic on EP1
        SET_EP0_MODE(USB_MODE_STATUS_ONLY);	
 
    }
    else
	//something was awry with the command, stall
    SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
}


/*
**
** FUNCTION:		SetAddress
**
** PURPOSE:			Implements Set Address command 
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered whenever a SETUP request to set the address has been received.
**					The address change cannot actually take place until the ensuing status-in is received
**					from the host -- so we just save the address and set a flag to indicate that a new
**					address was just received.  The code that handles INs will recognize this and set the address
**					properly.
**			
**					
*/

void SetAddress(void)
{
	if (ENDPOINT_A0_FIFO[USB_bmRequestType] != HOST_TO_DEVICE | STANDARD | DEVICE)
	{
		SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
	}
	else
	{
	    DeviceStatus.bAddress = 0x80 | ENDPOINT_A0_FIFO[USB_wValue];  //save address away, we can't actually use it yet
		SET_EP0_MODE(USB_MODE_STATUS_ONLY);
	}

}
											

/*
**
** FUNCTION:		ClearFeature
**
** PURPOSE:			Handles Clear Feature requests
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine checks for either a clear-remote-wakeup request,
**					or a clear-endpoint-stall request on endpoint 1 -- the only two valid clear
**					feature requests for this device.
**					
*/

void ClearFeature(void)
{

	if ((ENDPOINT_A0_FIFO[USB_bmRequestType] ==(HOST_TO_DEVICE | STANDARD | DEVICE))
		&& (ENDPOINT_A0_FIFO[USB_wValue] == USB_DEVICE_REMOTE_WAKEUP ) &&
		   ( !ENDPOINT_A0_FIFO[USB_wValueHi]))
		{
			DeviceStatus.bRemoteWakeup = DISABLE_REMOTE_WAKEUP; /* disable remote wakeup */
			SET_EP0_MODE(USB_MODE_STATUS_ONLY);
			return;
		}
	if ((ENDPOINT_A0_FIFO[USB_bmRequestType] == (HOST_TO_DEVICE | STANDARD | ENDPOINT)) &&
		   (DeviceStatus.bConfiguration == CONFIGURED) &&
		(!ENDPOINT_A0_FIFO[USB_wValueHi]) &&
		(ENDPOINT_A0_FIFO[USB_wIndex] == 0x81)&&	
		(ENDPOINT_A0_FIFO[USB_wValue] == USB_ENDPOINT_STALL)) 
		{																/*ep1 stall request*/
			DeviceStatus.bEP1Stall = 0;									/* not stalled */
			EP_A1_COUNTER &= ~DATATOGGLE;								/* clear data 0/1 bit */
			EP_A1_MODE = USB_MODE_NAK_IN_OUT;							//nak anything on endpoint 1 until ready
			SET_EP0_MODE(USB_MODE_STATUS_ONLY);
			return;
	   }
	SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
 	return;
}


/*
**
** FUNCTION:		SetFeature
**
**
**
** PURPOSE:			Handles Set Feature requests 
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine checks for either a set-remote-wakeup request,
**					or a set-endpoint-stall request on endpoint 1 -- the only two valid set
**					feature requests for this device.
**					
*/

void SetFeature(void)
{
	if ( (ENDPOINT_A0_FIFO[USB_bmRequestType] == (HOST_TO_DEVICE | STANDARD | DEVICE)) &&
		( ENDPOINT_A0_FIFO[USB_wValue] == USB_DEVICE_REMOTE_WAKEUP ) &&
		 ( !ENDPOINT_A0_FIFO[USB_wValueHi]))
		{
 			DeviceStatus.bRemoteWakeup = ENABLE_REMOTE_WAKEUP; /* set remote wakeup */
			SET_EP0_MODE(USB_MODE_STATUS_ONLY);
			return;
		}
	if ( (ENDPOINT_A0_FIFO[USB_bmRequestType] == (HOST_TO_DEVICE | STANDARD | ENDPOINT)) &&
		(DeviceStatus.bConfiguration == CONFIGURED) &&
			(!ENDPOINT_A0_FIFO[USB_wValueHi]) &&
			(ENDPOINT_A0_FIFO[USB_wIndex] == 0x81) && 
			(ENDPOINT_A0_FIFO[USB_wValue] == USB_ENDPOINT_STALL)) 
		{
			DeviceStatus.bEP1Stall = 1;								//mark endpoint as stalled
			EP_A1_MODE = USB_MODE_STALL_IN_OUT;						//stall traffic on endpoint 1
			SET_EP0_MODE(USB_MODE_STATUS_ONLY);
			return;
		}
	//command not valid
    SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
	return;
}


/*
**
** FUNCTION:		GetDescriptor
**
** PURPOSE:			Gets the requested descriptor 
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered when a Get Descriptor request is received.
**					It decodes the descriptor request and initializes XmtBuff to the
**					proper descriptor, then initiates the transfer by calling USB_control_read
**					
**					
*/

void GetDescriptor(void)
{
 	if ( (ENDPOINT_A0_FIFO[USB_bmRequestType] != (DEVICE_TO_HOST | STANDARD | DEVICE)) && 
		 (ENDPOINT_A0_FIFO[USB_bmRequestType] != (DEVICE_TO_HOST | STANDARD | INTERFACE)) &&
		 (ENDPOINT_A0_FIFO[USB_bmRequestType] != (DEVICE_TO_HOST | STANDARD | ENDPOINT)))		
	{
			 SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
			return;
	}
    switch (ENDPOINT_A0_FIFO[USB_wValueHi]) 
    {
		//decode descriptor request
        case USB_DEVICE :
            XmtBuff.bLength = device_desc_table[0];
            XmtBuff.p = device_desc_table;
            break;
        case USB_CONFIGURATION :
            XmtBuff.bLength = sizeof(config_desc_table) + 
							sizeof(Interface_Descriptor) + 
							sizeof(Class_Descriptor) + 
							sizeof(Endpoint_Descriptor);
            XmtBuff.p=config_desc_table;
            break;
        case USB_STRING :
            switch(ENDPOINT_A0_FIFO[USB_wValue])
            {
            case 0x00 :
                XmtBuff.bLength = sizeof(USBStringLanguageDescription);
                XmtBuff.p=USBStringLanguageDescription;
                break;
            case 0x01 :
                XmtBuff.bLength = sizeof(USBStringDescription1);
                XmtBuff.p=USBStringDescription1;
               break;
            case 0x02 :
                XmtBuff.bLength = sizeof(USBStringDescription2);
                XmtBuff.p=USBStringDescription2;
               break;
            case 0x03 :
                XmtBuff.bLength = sizeof(USBStringDescription3);
                XmtBuff.p=USBStringDescription3;
                break;
            case 0x04 :
                XmtBuff.bLength = sizeof(USBStringDescription4);
                XmtBuff.p=USBStringDescription4;
                break;
            case 0x05 :
                XmtBuff.bLength = sizeof(USBStringDescription5);
                XmtBuff.p=USBStringDescription5;
                break;
           default       :
                SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
                return;
            }
            break;
        case USB_HID :
            XmtBuff.bLength = sizeof(Class_Descriptor);
            XmtBuff.p=Class_Descriptor;
            break;
        case USB_REPORT :
            XmtBuff.bLength = sizeof(hid_report_desc_table); 
            XmtBuff.p=hid_report_desc_table;
            break;
        default :
			//not a recognizable request, stall
            SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
            return;
    }
	//initiate the transfer
    USB_control_read();
}


/*
**
** FUNCTION:		GetStatus
**
** PURPOSE:			Implements a Get Status request 
**
** PARAMETERS:		none
**
** DESCRIPTION:	    This routine checks for either a request to get the device
**					status, the interface status, or the endpoint status,
**					sets up XmtBuff to point to the appropriate status, and
**					calls USB_control_read to initiate the transfer.
**					
**					
**					
*/

void GetStatus(void)
{
	switch (ENDPOINT_A0_FIFO[USB_bmRequestType])
	{
     case (DEVICE_TO_HOST | STANDARD | DEVICE):
      	XmtBuff.bLength = 2;										//send 2 bytes
		XmtBuff.p = &DeviceStatus.bRemoteWakeup;					//point at remote wakeup status
		break;
	case (DEVICE_TO_HOST | STANDARD | INTERFACE):
		XmtBuff.bLength = sizeof(get_interface_status_table);		//point at interface status
		XmtBuff.p=get_interface_status_table;
		break;
	case (DEVICE_TO_HOST | STANDARD | ENDPOINT):
	    XmtBuff.bLength = 2;										//send two bytes 
		XmtBuff.p = &DeviceStatus.bEP1Stall;						//point at endpoint stall status
		break;
	default:
		SET_EP0_MODE(USB_MODE_STALL_IN_OUT);						//bogus request, complain
		return;
	}
 	USB_control_read();												//initiate transfer
 }


/*
**
** FUNCTION:		SetIdle
**
** PURPOSE:			implements a request to set the idle period
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered whenever a Set Idle request is received.
**					See the HID spec for the rules on setting idle periods.				
*/

void SetIdle(void)

{
	if ( ((ENDPOINT_A0_FIFO[USB_bmRequestType] !=  (HOST_TO_DEVICE | CLASS    | INTERFACE)) &&
		(ENDPOINT_A0_FIFO[USB_bmRequestType] !=  (HOST_TO_DEVICE | CLASS    | ENDPOINT)))  ||
		(ENDPOINT_A0_FIFO[USB_wIndex]) || (ENDPOINT_A0_FIFO[USB_wIndexHi]))
	{
		//request not valid, stall
		SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
		return;
	}
	if (!MouseStatus.bIdlePeriod)
	{
		//current idle setting is off. set both the new period and the counter
		MouseStatus.bIdlePeriod = ENDPOINT_A0_FIFO[USB_wValueHi];
		MouseStatus.bIdleCounter = MouseStatus.bIdlePeriod;
		SET_EP0_MODE(USB_MODE_STATUS_ONLY);
		return;
	}

	if (MouseStatus.bIdleCounter <= 2)
	{
		// counter for current idle period is nearly expiring.  leave it alone,
		//but set new idle period
		MouseStatus.bIdlePeriod = ENDPOINT_A0_FIFO[USB_wValueHi];
		SET_EP0_MODE(USB_MODE_STATUS_ONLY);
		return;
	}
	if ( ENDPOINT_A0_FIFO[USB_wValueHi] > MouseStatus.bIdleCounter)
	{
		//new period is shorter than the old one.  Force current idle period to expire soon,
		//and set new idle period
	      MouseStatus.bIdlePeriod = ENDPOINT_A0_FIFO[USB_wValueHi];
		MouseStatus.bIdleCounter = 1;
	}
	else
	{
		//new period is longer than old one. set new idle period, and adjust current period
		//to be equal to the new period, minus the counts that have already expired for the old one
		 MouseStatus.bIdlePeriod  = ENDPOINT_A0_FIFO[USB_wValueHi];
		MouseStatus.bIdleCounter = ENDPOINT_A0_FIFO[USB_wValueHi] - MouseStatus.bIdlePeriod;
	}
	SET_EP0_MODE(USB_MODE_STATUS_ONLY);
	return;
}


/*
**
** FUNCTION:		SetProtocol
**
** PURPOSE:			Implements the set-protocol request 
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered whenever an Set Protocol request is received
**					
*/

void SetProtocol(void)
{

	if (((ENDPOINT_A0_FIFO[USB_bmRequestType] !=  (HOST_TO_DEVICE | CLASS | INTERFACE)) &&
		(ENDPOINT_A0_FIFO[USB_bmRequestType] !=  (HOST_TO_DEVICE | CLASS | ENDPOINT))) ||
	    (ENDPOINT_A0_FIFO[USB_wIndex]) || 
		(ENDPOINT_A0_FIFO[USB_wIndexHi]) ||
		(ENDPOINT_A0_FIFO[USB_wValue] > REPORT_PROTOCOL))
		//invalid request, stall
        SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
    else
    {
        DeviceStatus.bProtocol = ENDPOINT_A0_FIFO[USB_wValue];		//set the new protocol
        SET_EP0_MODE(USB_MODE_STATUS_ONLY);										//acknowledge
    }
}


/*
**
** FUNCTION:		GetReport
**
** PURPOSE:			Implements the GetReport request 
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered whenever a request to get a report is received.
**					The most recent mouse data report is in the EP1 fifo.
**					
*/

void GetReport(void)
{

	if (ENDPOINT_A0_FIFO[USB_bmRequestType] !=  (DEVICE_TO_HOST | CLASS  | INTERFACE)) 
	{
		SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
		return;
	}
	//depending upon the current protocol, either send a 3 or 4-byte mouse packet
	//
    XmtBuff.bLength = (DeviceStatus.bProtocol == REPORT_PROTOCOL ? 4 : 3);	
    XmtBuff.p = &Mouse.bButtons;
    USB_control_read();
}


/*
**
** FUNCTION:		GetIdle
**
** PURPOSE:			Implements the Get Idle Request 
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered whenever a Get Idle request is received.
**					
**					
*/

void GetIdle(void)
{

	if (ENDPOINT_A0_FIFO[USB_bmRequestType] !=  (DEVICE_TO_HOST | CLASS | INTERFACE)) 
	{
		SET_EP0_MODE(USB_MODE_STALL_IN_OUT);
		return;
	}
    XmtBuff.bLength = 1;								//idle is 1-byte long
    XmtBuff.p=&MouseStatus.bIdlePeriod;					//point at it
    USB_control_read();									//initiate transfer
}


/*
**
** FUNCTION:		GetProtocol
**
** PURPOSE:			Implements the Get Protocol Request 
**
** PARAMETERS:		none
**
** DESCRIPTION:	 
**					This routine is entered whenever a Get Protocol request is received
**					
*/

void GetProtocol(void)