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Arsen:


      while(1)
        for (int i = 0; i < configurationDescriptor.bNumInterfaces; i++) {
            FT_GetInterfaceDescriptor(HandleFtdi, i, pInterfaceDescriptor + i);
            for (int j = 0; j < pInterfaceDescriptor.bNumEndpoints; j++) {
                res = FT_GetPipeInformation(HandleFtdi,i,j, &pipeInformation);
                if (res != FT_OK) {
                    cout << "FT_GetPipeInformation Error!";
                } else {
                    if (!(pipeInformation.PipeId & 0x80)) {
                        res = FT_WritePipe(HandleFtdi, pipeInformation.PipeId, bufWr, pipeInformation.MaximumPacketSize, &ulBytesTransferred, NULL);
                        if (res != FT_OK) {
                            cout << "FT_WritePipe Error " ;
                        }
                    }
                    else {
                        res = FT_ReadPipe(HandleFtdi, pipeInformation.PipeId, bufRd, pipeInformation.MaximumPacketSize, &ulBytesTransferred, NULL); //second time this function does not return. Why? The first time it returns by timeout.
                        if (res != FT_OK) {
                            cout << "FT_ReadPipe Error " ;   
                        }
                   }
                }
            }
        }

Hi all. Please, say Me.
This part of the program works well, but on the second pass, when FT_ReadPipe is executed, the program freezes and does not return after timeout. The first time it returns by timeout (default 5 seconds).
In addition, I want to say that we made a USB device with FT600 and STM. But the STM is not running yet and is not writing to the FT600 buffer, so it's good that FT_ReadPipe is returning after a timeout. But why doesn’t it return the second time but freezes?
Thank everybody.

FTDI Community:
Hi,

Have a look at section 3.2 of AN_412 FT600/FT601 Bridge Chips Integration, this goes over the abort recovery process.

Any error or timeout requires this abort process before resuming the read/write.

Best Regards
FTDI Community

Arsen:
Thank you very much for Your reply.

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