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Cypress CY7C68013A USB Bulk transfer problem

Hi Frnds,

I am using Cypress CY7C68013A EZ-USB micro controller, I have used BULKLOOP example given by cypress, where they have given a loop back transaction between EP2 to EP6, But I have changed the code for transmission of 64bytes of data as bulk on EP1, below code which i have written for bulk write operation, when i run this code it is transferring 64bytes of data ,but as a JUNK data, what is the mistake in this code, if there is any mistake please through some light on it.

 if(!(EP01STAT & bmEP1INBSY))
        {
          //Source is Internal RAM Buffer

                memset(UsbBuffer,'\0',64);

        APTR1H = MSB(&UsbBuffer);
        APTR1L = LSB(*UsbBuffer);

        // Destination is External RAM at 0x2800
        AUTOPTRH2 = MSB(0x28);
        AUTOPTRL2 = LSB(0x00);

        EP1INBC = 0x40;   //64KB

        count = EP1INBC;// (EP2BCH << 8) + EP2BCL;

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

//              EP1INBC = 0x40;   //64KB

                // Destination is External RAM at 0x2800
                APTR1H = MSB(0x28);
        APTR1L = LSB(0x00);

                AUTOPTRH2 = MSB(&EP1INBUF);
        AUTOPTRL2 = LSB(&EP1INBUF);

//              EP1INBC = 0x40;   //64KB

        count = EP1INBC;// (EP2BCH << 8) + EP2BCL;

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

        EP2BCL = 0x40;          // re(arm) EP2OUT
        u8TransmitFlag =1;
        }
}

Rajesh

Parents

0 Rajesh N over 18 years ago in reply to ImPer Westermark

Dear Per Westermark,

Thanks for u r valuable suggestions, I have changed code according to as u said, it is now working fine, But there is one more problem now,

I have used EP1 as IN transfer mode , i.e., EP1IN , but when i trasmit my buffet for first time i get JUNK, after I transmit for 2nd time onwards i get the what i am transmitting, I have checked many times, I get JUNK data first time and then the actual data, why it is happening
. If there is any solution please tell.

        if(!(EP01STAT & bmEP1INBSY))
        //      if(!(EP1INCS &0x02))
                {
        //              while(!(EP1INCS &0x02));
                        count=EP1INBC;
                        for(i=0;i<count;i++)
                        {
                                EP1INBUF[j]=gb+i+Inc;
                                gb++;
                                j++;
                        }
                        SYNCDELAY;
                        gb=0;j=0;
                        Inc++;

                        EP1INBC = 0x40;
                        SYNCDELAY;
        //              EP1INCS |=0x01;

                        ACC=XBYTE[0x9800];
                        SYNCDELAY;
                        ACC=XBYTE[0x8000];
                        SYNCDELAY;
                        ACC=XBYTE[0xB800];




        }


Rajesh

Reply

0 Rajesh N over 18 years ago in reply to ImPer Westermark

Dear Per Westermark,

Thanks for u r valuable suggestions, I have changed code according to as u said, it is now working fine, But there is one more problem now,

        if(!(EP01STAT & bmEP1INBSY))
        //      if(!(EP1INCS &0x02))
                {
        //              while(!(EP1INCS &0x02));
                        count=EP1INBC;
                        for(i=0;i<count;i++)
                        {
                                EP1INBUF[j]=gb+i+Inc;
                                gb++;
                                j++;
                        }
                        SYNCDELAY;
                        gb=0;j=0;
                        Inc++;

                        EP1INBC = 0x40;
                        SYNCDELAY;
        //              EP1INCS |=0x01;

                        ACC=XBYTE[0x9800];
                        SYNCDELAY;
                        ACC=XBYTE[0x8000];
                        SYNCDELAY;
                        ACC=XBYTE[0xB800];




        }


Rajesh

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