I use the bulkloop between EP0 and EP2(Autoin ,2 buffers) through a vender command,but when I want to read data from EP2,it sometime return random data and total bytes  that not the same with the antoinlenhl I have set,somtime it can return the right data ,but when I change the data on EP0 out ,the return data can not change immdiately(the same with the data i have transfered  before ). I have reset the fifo in TD_Init  why  it return random data(why this happen?) ,or the bulkloop can not work on slave fifo mode?Can someone help me? Thanks

void TD_Init(void)             // Called once at startup
{
   // set the CPU clock to 48MHz
     CPUCS =0x10;
  SYNCDELAY;
   // set the slave FIFO interface to 48MHz
     IFCONFIG = 0xC3;
  SYNCDELAY;
     REVCTL = 0x03;
  SYNCDELAY;
  // 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  //      ...these have been replaced by GPIFTC[B3:B0] registers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 &= 0x7F;   //set invalid
  EP1INCFG &= 0x7F;
  SYNCDELAY;                    // see TRM section 15.14
  EP2CFG = 0xE2;    //set EP2 valid, in, bulk, 512, double buffer.
  SYNCDELAY;  
  EP4CFG &= 0x7F;    //set invalid.
  SYNCDELAY;                   
      //EP6CFG = 0xE2;   
      // SYNCDELAY;  
  EP8CFG &= 0x7F;          //set invalid.
  SYNCDELAY;   
  FIFORESET = 0x80;             // reset all FIFOs
  SYNCDELAY;
   //FIFORESET = 0x82;
   // SYNCDELAY;
   // FIFORESET = 0x84;
   // SYNCDELAY;
   FIFORESET = 0x02;
   SYNCDELAY;
 // FIFORESET = 0x04;
   // SYNCDELAY;
   // FIFORESET = 0x06;
   // SYNCDELAY;
 //FIFORESET = 0x06;
    //SYNCDELAY;
    FIFORESET = 0x00;
    SYNCDELAY;

    EP2FIFOCFG = 0x0D;
    SYNCDELAY;
    EP2AUTOINLENH = 0x00;
    SYNCDELAY;
    EP2AUTOINLENL = 0x04; //4 bytes in
    SYNCDELAY;

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

}

BOOL DR_VendorCmnd(void)
{
          WORD  i;      
          WORD count;
  switch (SETUPDAT[1])
  {    
      //FIFORESET = 0x80; // reset all FIFOs
  //SYNCDELAY;
   //FIFORESET = 0x82;
  // SYNCDELAY;
  // FIFORESET = 0x84;
  // SYNCDELAY;
  //  FIFORESET = 0x02;
  //  SYNCDELAY;
  //  FIFORESET = 0x06;
   // SYNCDELAY;
   // FIFORESET = 0x00;
   // SYNCDELAY;  
       case  VD_COMMAND:
     //FIFORESET = 0x80;
     // SYNCDELAY;
         //  FIFORESET = 0x06;
        //   SYNCDELAY;
  
       if(!(EP0CS&bmEPBUSY))
      { // check EP0 BUSY bit
     if(!(EP2468STAT & bmEP2FULL))
      {  // check EP2 FULL(busy) bit in EP2468STAT (SFR), core set's this bit when FIFO is full
        AUTOPTR1H = MSB( &EP0BUF );
        AUTOPTR1L = LSB( &EP0BUF );

        AUTOPTRH2 = MSB( &EP2FIFOBUF );
        AUTOPTRL2 = LSB( &EP2FIFOBUF );
                  
        count = (EP0BCH << 8) + EP0BCL;

        // loop EP0OUT buffer data to EP2IN
        for( i = 0x0000; i <count; i++ )
        {
 
           // setup to transfer EP0OUT buffer to EP2IN buffer using AUTOPOINTER(s)
           EXTAUTODAT2 = EXTAUTODAT1;
        }
        EP2CH = EP0BCH; 
        SYNCDELAY; 
        EP2CL = EP0BCL;        // arm EP2IN
        SYNCDELAY;                   
        EP0BCL = 0x80;
  }                    // re(arm) EP0OUT
        break;
       }
     default:
         return(TRUE);
  }
        //set the PA.0 as output pin
   EP0CS|=bmHSNAK;
    return(FALSE);
}
 

 Hi,

I am trying to understand your application.

Could you please let me know why you are opting for EP0 even though you have other endpoints that can be used for data trasnfers.

Thanks,

sai krishna.