//-----------------------------------------------------------------------------
// F3xx_USB0_InterruptServiceRoutine.c
//-----------------------------------------------------------------------------
// Copyright 2005 Silicon Laboratories, Inc.
// http://www.silabs.com
//
// Program Description:
//
// Source file for USB firmware. Includes top level ISR with SETUP,
// and Endpoint data handlers.  Also includes routine for USB suspend,
// reset, and procedural stall.
//
//
// How To Test:    See Readme.txt
//
//
// FID:            3XX000033
// Target:         C8051F32x
// Tool chain:     Keil C51 7.50 / Keil EVAL C51
//                 Silicon Laboratories IDE version 2.6
// Command Line:   See Readme.txt
// Project Name:   F3xx_MouseExample
//
//
// Release 1.2
//    -Changes by PD
//    -Added SendPacket ()
//    -Added EP_RX conditional statement to Endpoint 0 Handler
//
// Release 1.0
//    -Initial Revision (DM)
//    -08 NOV 2002
//

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include "c8051f3xx.h"
#include "F3xx_USB0_Register.h"
#include "F3xx_USB0_InterruptServiceRoutine.h"
#include "F3xx_USB0_Descriptor.h"
#include "F3xx_USB0_ReportHandler.h"


//-----------------------------------------------------------------------------
// Global Variable Definitions
//-----------------------------------------------------------------------------
unsigned char USB0_STATE;               // Holds the current USB State
                                       // def. in F3xx_USB0_InterruptServiceRoutine.h

setup_buffer SETUP;                    // Buffer for current device
                                       // request information

unsigned int DATASIZE;                 // Size of data to return
unsigned int DATASENT;                 // Amount of data sent so far
unsigned char* DATAPTR;                // Pointer to data to return

unsigned char EP_STATUS[3] = {EP_IDLE, EP_HALT, EP_HALT};
                                       // Holds the status for each endpoint



//-----------------------------------------------------------------------------
// Local Function Definitions
//-----------------------------------------------------------------------------
void Usb_Resume (void);                // resumes USB operation
void Usb_Reset (void);                 // Called after USB bus reset
void Handle_Control (void);            // Handle SETUP packet on EP 0
void Handle_In1 (void);                // Handle in packet on EP 1
void Handle_Out1 (void);               // Handle out packet on EP 1
void Usb_Suspend (void);               // This routine called when
                                       // suspend signalling on bus
void Fifo_Read (unsigned char, unsigned int, unsigned char *);
                                       // Used for multiple byte reads
                                       // of Endpoint fifos
void Fifo_Write_Foreground (unsigned char, unsigned int, unsigned char *);
                                       // Used for multiple byte writes
                                       // of Endpoint fifos in foreground
void Fifo_Write_InterruptServiceRoutine (unsigned char, unsigned int,
										 unsigned char *);
                                       // Used for multiple byte
                                       // writes of Endpoint fifos


//-----------------------------------------------------------------------------
// Usb_ISR
//-----------------------------------------------------------------------------
//
// Called after any USB type interrupt, this handler determines which type
// of interrupt occurred, and calls the specific routine to handle it.
//
//-----------------------------------------------------------------------------
void Usb_ISR (void) interrupt 8        // Top-level USB ISR
{

   unsigned char bCommon, bIn, bOut;
   POLL_READ_BYTE (CMINT, bCommon);    // Read all interrupt registers
   POLL_READ_BYTE (IN1INT, bIn);       // this read also clears the register
   POLL_READ_BYTE (OUT1INT, bOut);
   {
      if (bCommon & rbRSUINT)          // Handle Resume interrupt
      {
         Usb_Resume ();
      }
      if (bCommon & rbRSTINT)          // Handle Reset interrupt
      {
         Usb_Reset ();
      }
      if (bIn & rbEP0)                 // Handle SETUP packet received
      {                                // or packet transmitted if Endpoint 0
         Handle_Control ();            // is in transmit mode
      }
      if (bIn & rbIN1)                 // Handle In Packet sent, put new data
      {                                // on endpoint 1 fifo
         Handle_In1 ();
      }
      if (bOut & rbOUT1)               // Handle Out packet received, take
      {                                // data off endpoint 2 fifo
         Handle_Out1 ();
      }
      if (bCommon & rbSUSINT)          // Handle Suspend interrupt
      {
         Usb_Suspend ();
      }
   }
}

//-----------------------------------------------------------------------------
// Support Routines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// Usb_Reset
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// - Set state to default
// - Clear Usb Inhibit bit
//
//-----------------------------------------------------------------------------

void Usb_Reset (void)
{
   USB0_STATE = DEV_DEFAULT;           // Set device state to default

   POLL_WRITE_BYTE (POWER, 0x01);      // Clear usb inhibit bit to enable USB
                                       // suspend detection

   EP_STATUS[0] = EP_IDLE;             // Set default Endpoint Status
   EP_STATUS[1] = EP_HALT;
   EP_STATUS[2] = EP_HALT;
}



//-----------------------------------------------------------------------------
// Usb_Resume
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// Resume normal USB operation
//
//-----------------------------------------------------------------------------

void Usb_Resume(void)
{
   volatile int k;

   k++;

   // Add code for resume
}


//-----------------------------------------------------------------------------
// Handle_Control
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// - Decode Incoming SETUP requests
// - Load data packets on fifo while in transmit mode
//
//-----------------------------------------------------------------------------

void Handle_Control (void)
{
   unsigned char ControlReg;           // Temporary storage for EP control
                                       // register

   POLL_WRITE_BYTE (INDEX, 0);         // Set Index to Endpoint Zero
   POLL_READ_BYTE (E0CSR, ControlReg); // Read control register

   if (EP_STATUS[0] == EP_ADDRESS)     // Handle Status Phase of Set Address
                                       // command
   {
      POLL_WRITE_BYTE (FADDR, SETUP.wValue.c[LSB]);
      EP_STATUS[0] = EP_IDLE;
   }

   if (ControlReg & rbSTSTL)           // If last packet was a sent stall,
   {                                   // reset STSTL bit and return EP0
                                       // to idle state
      POLL_WRITE_BYTE (E0CSR, 0);
      EP_STATUS[0] = EP_IDLE;
      return;
   }

   if (ControlReg & rbSUEND)           // If last SETUP transaction was
   {                                   // ended prematurely then set
      POLL_WRITE_BYTE (E0CSR, rbDATAEND);
      // Serviced SETUP End bit and return EP0
      POLL_WRITE_BYTE (E0CSR, rbSSUEND);
      EP_STATUS[0] = EP_IDLE;          // to idle state
   }

   if (EP_STATUS[0] == EP_IDLE)        // If Endpoint 0 is in idle mode
   {
      if (ControlReg & rbOPRDY)        // Make sure that EP 0 has an Out Packet
      {                                // ready from host although if EP0
                                       // is idle, this should always be the
                                       // case
         Fifo_Read (FIFO_EP0, 8, (unsigned char *)&SETUP);
                                       // Get SETUP Packet off of Fifo,
                                       // it is currently Big-Endian

                                       // Compiler Specific - these next three
                                       // statements swap the bytes of the
                                       // SETUP packet words to Big Endian so
                                       // they can be compared to other 16-bit
                                       // values elsewhere properly
         SETUP.wValue.i = SETUP.wValue.c[MSB] + 256*SETUP.wValue.c[LSB];
         SETUP.wIndex.i = SETUP.wIndex.c[MSB] + 256*SETUP.wIndex.c[LSB];
         SETUP.wLength.i = SETUP.wLength.c[MSB] + 256*SETUP.wLength.c[LSB];

		// Intercept HID class-specific requests
		if( (SETUP.bmRequestType & ~0x80) == DSC_HID) {
			switch (SETUP.bRequest) {
				case GET_REPORT:
					Get_Report ();
					break;
				case SET_REPORT:
					Set_Report ();
					break;
				case GET_IDLE:
					Get_Idle ();
					break;
				case SET_IDLE:
					Set_Idle ();
					break;
				case GET_PROTOCOL:
					Get_Protocol ();
					break;
				case SET_PROTOCOL:
					Set_Protocol ();
					break;
	            default:
                  Force_Stall ();      // Send stall to host if invalid
	            break;                 // request
			}
		} else

         switch (SETUP.bRequest)       // Call correct subroutine to handle
         {                             // each kind of standard request
            case GET_STATUS:
               Get_Status ();
               break;
            case CLEAR_FEATURE:
               Clear_Feature ();
               break;
            case SET_FEATURE:
               Set_Feature ();
               break;
            case SET_ADDRESS:
               Set_Address ();
               break;
            case GET_DESCRIPTOR:
               Get_Descriptor ();
               break;
            case GET_CONFIGURATION:
               Get_Configuration ();
               break;
            case SET_CONFIGURATION:
               Set_Configuration ();
               break;
            case GET_INTERFACE:
               Get_Interface ();
               break;
            case SET_INTERFACE:
               Set_Interface ();
               break;
            default:
               Force_Stall ();         // Send stall to host if invalid request
               break;
         }
      }
   }

   if (EP_STATUS[0] == EP_TX)          // See if endpoint should transmit
   {
      if (!(ControlReg & rbINPRDY) )   // Don't overwrite last packet
      {
         // Read control register
         POLL_READ_BYTE (E0CSR, ControlReg);

         // Check to see if SETUP End or Out Packet received, if so do not put
         // any new data on FIFO
         if ((!(ControlReg & rbSUEND)) || (!(ControlReg & rbOPRDY)))
         {
            // Add In Packet ready flag to E0CSR bitmask
            ControlReg = rbINPRDY;
            if (DATASIZE >= EP0_PACKET_SIZE)
            {
               // Break Data into multiple packets if larger than Max Packet