ibn.c

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//-----------------------------------------------------------------------------
//   File:     ibn.c
// Contents:   firmware to perform bulk loopback of EP2OUT to EP6IN and
//             EP4OUT to EP8IN using the IBN (In Bulk Nak) interrupt
//             to initiate the transfer.
//
// $Archive: /USB/Examples/FX2LP/ibn/ibn.c $
// $Date: 3/23/05 2:59p $
// $Revision: 3 $
//
//
//-----------------------------------------------------------------------------
// Copyright 2003, Cypress Semiconductor Corporation
//-----------------------------------------------------------------------------
#pragma NOIV               // Do not generate interrupt vectors

#include "fx2.h"
#include "fx2regs.h"
#include "syncdly.h"            // SYNCDELAY macro

extern BOOL GotSUD;             // Received setup data flag
extern BOOL Sleep;
extern BOOL Rwuen;
extern BOOL Selfpwr;

BYTE Configuration;             // Current configuration
BYTE AlternateSetting;          // Alternate settings
BYTE IbnFlag;

//-----------------------------------------------------------------------------
// Task Dispatcher hooks
//   The following hooks are called by the task dispatcher.
//-----------------------------------------------------------------------------

void TD_Init(void)              // Called once at startup
{
  CPUCS = 0x10;                 // CLKSPD[1:0]=10, for 48MHz operation
                                // CLKOE=0, don't drive CLKOUT

  // Registers which require a synchronization delay, see section 15.14
  // FIFORESET        FIFOPINPOLAR
  // INPKTEND         OUTPKTEND
  // EPxBCH:L         REVCTL
  // GPIFTCB3         GPIFTCB2
  // GPIFTCB1         GPIFTCB0
  // EPxFIFOPFH:L     EPxAUTOINLENH:L
  // EPxFIFOCFG       EPxGPIFFLGSEL
  // PINFLAGSxx       EPxFIFOIRQ
  // EPxFIFOIE        GPIFIRQ
  // GPIFIE           GPIFADRH:L
  // UDMACRCH:L       EPxGPIFTRIG
  // GPIFTRIG
  
  // Note: The pre-REVE EPxGPIFTCH/L register are affected, as well...
  //      ...these have been replaced by GPIFTC[B3:B0] registers
  
  // default: all endpoints have their VALID bit set
  // default: TYPE1 = 1 and TYPE0 = 0 --> BULK  
  // default: EP2 and EP4 DIR bits are 0 (OUT direction)
  // default: EP6 and EP8 DIR bits are 1 (IN direction)
  // default: EP2, EP4, EP6, and EP8 are double buffered

  // we are just using the default values, yes this is not necessary...
  EP1OUTCFG = 0xA0;
  EP1INCFG = 0xA0;
  SYNCDELAY;                    // see TRM section 15.14
  EP2CFG = 0xA2;
  SYNCDELAY;                    // 
  EP4CFG = 0xA0;
  SYNCDELAY;                    // 
  EP6CFG = 0xE2;
  SYNCDELAY;                    // 
  EP8CFG = 0xE0;

  // out endpoints do not come up armed
  
  // since the defaults are double buffered we must write dummy byte counts twice
  SYNCDELAY;                    // 
  EP2BCL = 0x80;                // arm EP2OUT by writing byte count w/skip.
  SYNCDELAY;                    // 
  EP4BCL = 0x80;    
  SYNCDELAY;                    // 
  EP2BCL = 0x80;                // arm EP4OUT by writing byte count w/skip.
  SYNCDELAY;                    // 
  EP4BCL = 0x80;    

  NAKIRQ = bmBIT0;              // clear the global IBN IRQ
  NAKIE |= bmBIT0;              // enable the global IBN IRQ

  IbnFlag = 0x00;               // clear our IBN flag
  IBNIRQ = 0xFF;                // clear any pending IBN IRQ
  IBNIE |= bmEP6IBN | bmEP8IBN; // enable the IBN interrupt for EP6 and EP8

  // enable dual autopointer feature
  AUTOPTRSETUP |= 0x01;

}

void TD_Poll(void)              // Called repeatedly while the device is idle
{
  int i;
  int byteCount;

  // if there is new data in EP2FIFOBUF and the IBN flag for EP6 has been set, then copy
  // the data from EP2 to EP6
  if(!(EP2468STAT & bmEP2EMPTY) && (IbnFlag & bmEP6IBN) )
  {
     APTR1H = MSB( &EP2FIFOBUF );
     APTR1L = LSB( &EP2FIFOBUF );

     AUTOPTRH2 = MSB( &EP6FIFOBUF );
     AUTOPTRL2 = LSB( &EP6FIFOBUF );

     byteCount = (EP2BCH << 8) + EP2BCL;

     for( i = 0x0000; i < byteCount; i++ )
     {
        EXTAUTODAT2 = EXTAUTODAT1;
     }

     EP6BCH = EP2BCH;  
     SYNCDELAY;  
     EP6BCL = EP2BCL;           // arm EP6IN

     IbnFlag &= ~bmEP6IBN;      // clear the IBN flag
     IBNIRQ = bmEP6IBN;         // clear the IBN IRQ
     IBNIE |= bmEP6IBN;         // enable the IBN IRQ

     SYNCDELAY;                        
     EP2BCL = 0x80;             // re(arm) EP2OUT
  }

  // if there is new data in EP4FIFOBUF and the IBN flag for EP8 has been set, then copy
  // the data from EP2 to EP6
  if(!(EP2468STAT & bmEP4EMPTY) && (IbnFlag & bmEP8IBN) )
  {
     APTR1H = MSB( &EP4FIFOBUF );
     APTR1L = LSB( &EP4FIFOBUF );

     AUTOPTRH2 = MSB( &EP8FIFOBUF );
     AUTOPTRL2 = LSB( &EP8FIFOBUF );

     byteCount = (EP4BCH << 8) + EP4BCL;

     for( i = 0x0000; i < byteCount; i++ )
     {
        EXTAUTODAT2 = EXTAUTODAT1;
     }

     EP8BCH = EP4BCH;  
     SYNCDELAY;  
     EP8BCL = EP4BCL;           // arm EP8IN

     IbnFlag &= ~bmEP8IBN;      // clear the IBN flag
     IBNIRQ = bmEP8IBN;         // clear the IBN IRQ
     IBNIE |= bmEP8IBN;         // enable the IBN IRQ

     SYNCDELAY;                        
     EP4BCL = 0x80;             // re(arm) EP4OUT
  }

}

BOOL TD_Suspend(void)          // Called before the device goes into suspend mode
{
   return(TRUE);
}

BOOL TD_Resume(void)          // Called after the device resumes
{
   return(TRUE);
}

//-----------------------------------------------------------------------------
// Device Request hooks
//   The following hooks are called by the end point 0 device request parser.
//-----------------------------------------------------------------------------

BOOL DR_GetDescriptor(void)
{
   return(TRUE);
}

BOOL DR_SetConfiguration(void)   // Called when a Set Configuration command is received
{
   Configuration = SETUPDAT[2];
   return(TRUE);            // Handled by user code
}

BOOL DR_GetConfiguration(void)   // Called when a Get Configuration command is received
{
   EP0BUF[0] = Configuration;
   EP0BCH = 0;
   EP0BCL = 1;
   return(TRUE);            // Handled by user code
}

BOOL DR_SetInterface(void)       // Called when a Set Interface command is received
{
   AlternateSetting = SETUPDAT[2];
   return(TRUE);            // Handled by user code
}

BOOL DR_GetInterface(void)       // Called when a Set Interface command is received
{
   EP0BUF[0] = AlternateSetting;
   EP0BCH = 0;
   EP0BCL = 1;
   return(TRUE);            // Handled by user code
}

BOOL DR_GetStatus(void)
{
   return(TRUE);
}

BOOL DR_ClearFeature(void)
{
   return(TRUE);
}

BOOL DR_SetFeature(void)
{
   return(TRUE);
}

BOOL DR_VendorCmnd(void)
{
   return(TRUE);
}

//-----------------------------------------------------------------------------
// USB Interrupt Handlers
//   The following functions are called by the USB interrupt jump table.
//-----------------------------------------------------------------------------

// Setup Data Available Interrupt Handler
void ISR_Sudav(void) interrupt 0
{
   GotSUD = TRUE;            // Set flag
   EZUSB_IRQ_CLEAR();
   USBIRQ = bmSUDAV;         // Clear SUDAV IRQ
}

// Setup Token Interrupt Handler
void ISR_Sutok(void) interrupt 0
{
   EZUSB_IRQ_CLEAR();
   USBIRQ = bmSUTOK;         // Clear SUTOK IRQ
}

void ISR_Sof(void) interrupt 0
{
   EZUSB_IRQ_CLEAR();
   USBIRQ = bmSOF;            // Clear SOF IRQ
}

void ISR_Ures(void) interrupt 0
{
   if (EZUSB_HIGHSPEED())
   {
      pConfigDscr = pHighSpeedConfigDscr;
      pOtherConfigDscr = pFullSpeedConfigDscr;
   }
   else
   {
      pConfigDscr = pFullSpeedConfigDscr;
      pOtherConfigDscr = pHighSpeedConfigDscr;
   }
   
   EZUSB_IRQ_CLEAR();
   USBIRQ = bmURES;         // Clear URES IRQ
}

void ISR_Susp(void) interrupt 0
{
   Sleep = TRUE;
   EZUSB_IRQ_CLEAR();
   USBIRQ = bmSUSP;
}

void ISR_Highspeed(void) interrupt 0
{
   if (EZUSB_HIGHSPEED())
   {
      pConfigDscr = pHighSpeedConfigDscr;
      pOtherConfigDscr = pFullSpeedConfigDscr;
   }
   else
   {
      pConfigDscr = pFullSpeedConfigDscr;
      pOtherConfigDscr = pHighSpeedConfigDscr;
   }

   EZUSB_IRQ_CLEAR();
   USBIRQ = bmHSGRANT;
}
void ISR_Ep0ack(void) interrupt 0
{
}
void ISR_Stub(void) interrupt 0
{
}
void ISR_Ep0in(void) interrupt 0
{
}
void ISR_Ep0out(void) interrupt 0
{
}
void ISR_Ep1in(void) interrupt 0
{
}
void ISR_Ep1out(void) interrupt 0
{
}
void ISR_Ep2inout(void) interrupt 0
{
}
void ISR_Ep4inout(void) interrupt 0
{
}
void ISR_Ep6inout(void) interrupt 0
{
}
void ISR_Ep8inout(void) interrupt 0
{
}
void ISR_Ibn(void) interrupt 0
{
   int i;

   // disable IBN for all endpoints
   IBNIE = 0x00;

   EZUSB_IRQ_CLEAR();         // clear the global USB IRQ

   // Find the EP with its IBN bit set
   for (i=0;i<8;i++)
   {
      if (IBNIRQ & (1 << i))
      {
         IbnFlag |= (1 << i);       // set the appropriate IBN flag bit
         IBNIRQ |= (1 << i);        // clear the IBN IRQ for this endpoint
      }
   }

   NAKIRQ |= bmBIT0;          // clear the global IBN IRQ

   // re-enable IBN interrupt for any endpoints that don't already have
   // an IBN pending in IbnFlag
   IBNIE = (bmEP6IBN | bmEP8IBN) & ~IbnFlag;
}

void ISR_Ep0pingnak(void) interrupt 0
{
}
void ISR_Ep1pingnak(void) interrupt 0
{
}
void ISR_Ep2pingnak(void) interrupt 0
{
}
void ISR_Ep4pingnak(void) interrupt 0
{
}
void ISR_Ep6pingnak(void) interrupt 0
{
}
void ISR_Ep8pingnak(void) interrupt 0
{
}
void ISR_Errorlimit(void) interrupt 0
{
}
void ISR_Ep2piderror(void) interrupt 0
{
}
void ISR_Ep4piderror(void) interrupt 0
{
}
void ISR_Ep6piderror(void) interrupt 0
{
}
void ISR_Ep8piderror(void) interrupt 0
{
}
void ISR_Ep2pflag(void) interrupt 0
{
}
void ISR_Ep4pflag(void) interrupt 0
{
}
void ISR_Ep6pflag(void) interrupt 0
{
}
void ISR_Ep8pflag(void) interrupt 0
{
}
void ISR_Ep2eflag(void) interrupt 0
{
}
void ISR_Ep4eflag(void) interrupt 0
{
}
void ISR_Ep6eflag(void) interrupt 0
{
}
void ISR_Ep8eflag(void) interrupt 0
{
}
void ISR_Ep2fflag(void) interrupt 0
{
}
void ISR_Ep4fflag(void) interrupt 0
{
}
void ISR_Ep6fflag(void) interrupt 0
{
}
void ISR_Ep8fflag(void) interrupt 0
{
}
void ISR_GpifComplete(void) interrupt 0
{
}
void ISR_GpifWaveform(void) interrupt 0
{
}