4 Replies Latest reply on Apr 20, 2012 1:29 AM by prajith.cheerakkoda

    how to transfer large files with fx2lp

    qiu.can

      Hi there,

         

       

         

      I am trying to transfer large files(larger than 1MB) with fx2lp.  Actually, I just followed AN61345(Implementing an FX2LP™-FPGA Interface). It worked well on EZ-USB console, 512 bytes send to ep2, 512 bytes back to ep6.

         

       

         

      Then I made a app with VC6. Divide the large file to 512 bytes packets, and transfer them via Xferdata() fuction. The code is

         

       

         

      for(i=0;i<pcount;i++)

         

       

         

      {

         

      for(j=0;j<buf_size;j++){usb_i[j]=sig_i[buf_size*i+j];}

         

      if(USBDevice->BulkOutEndPt)

         

      i_finish=USBDevice->BulkOutEndPt->XferData(usb_i,buf_size);

         

      if(USBDevice->BulkInEndPt)

         

      o_finish=USBDevice->BulkInEndPt->XferData(usb_o,buf_size);

         

      for(j=0;j<buf_size;j++) {sig_o[buf_size*i+j]=usb_o[j];}

         

      }

         

       

         

      When the files are small(<20kB), it works well. Every step ep6 become empty when the data is read by host.

         

       

         

      If the file is larger, as the process continus, ep6 will not be empty sometime and all the followed data is error code(always CD).

         

       

         

      I am using cy3684_kit_15, hope someone help me to find the reason or give some advice.

         

       

         

      Thanks!

        • 1. Re: how to transfer large files with fx2lp
          prajith.cheerakkoda

            Hi,

             

            Please take the trace of USB traffic(using USB traffic analyzers like CATC) and post it here so that we can have a look at it.

             

          Thanks

             

          Prajith

             


          • 2. Re: how to transfer large files with fx2lp
            qiu.can

             Hi,

               

            Thanks for your reply. Besides, what's a CATC? An instrument or some kind of software?

               

            I just made a simple test:

               

             

               

            LONG buf_size=512;

               

            for(int i=0;i<100;i++)

               

            {

               

            o_finish=USBDevice->BulkOutEndPt->XferData(usb_i,buf_size);

               

            i_finish=USBDevice->BulkInEndPt->XferData(usb_o,buf_size);

               

            cout<<o_finish<<'\t'<<i_finish<<endl;

               

            }

               

            The output:

               

            1 1

               

            1 1

               

            ...

               

            1 1

               

            1 0

               

            1 0

               

            ...

               

            1 0

               

            press any key...

               

             

               

            The BulkIn XferData immediately failed. I think there are two possible reasons: (a)EP6 stalled; (b)EP6 do not have enough data. Is it right?

               

            Then after the test above, I just do

               

            i_finish=USBDevice->BulkInEndPt->XferData(usb_o,buf_size);

               

            again. And it returns 1, the empty flag also changed.

               

            So, can I say EP6 works well, the XferData() goes wrong?

               

            I am try to start two new threads for BulkIn, one failed, start another, hope it worked.

               

             

               

            Thanks again!

            • 3. Re: how to transfer large files with fx2lp
              qiu.can

               Sorry guys,

                 

              I just changed a powersupply, and the problem solved...

                 

              Should find this at the very start...

                 
                      
              • 4. Re: how to transfer large files with fx2lp
                prajith.cheerakkoda

                 Coool  

                   

                Thanks for sharing the fix.