I have a device with ezusb fx2 and I controlled the device using ezusb driver version 1.30 I moved to cyUSB driver version 3.4.7.0 but the communication with device is slower.
With old driver, with a fix hardware configuration, I am able to reach 30Mb/s of data trasfer, simply upgrading the driver to the cyUSB I only reach 15Mb/s.
I don't use the cypress library, I use directly the driver, below a detail of the code I use in both cases, obviously I cannot believe the new driver is slower than the old, so what I am doing wrong?
Thanks in advance for your support.
Alberto
#define MAX_BLT_SIZE (60*1024) BOOLEAN bResult; ULONG nBytes, totBytes = 0, lun; int np, i, resto;#ifdef NEWDRIVER // cyUSB.sys SINGLE_TRANSFER singleTransfer;#else BULK_TRANSFER_CONTROL bulkControl; bulkControl.pipeNum = 2;#endif np = length / MAX_BLT_SIZE; resto = length - np * MAX_BLT_SIZE; if( resto > 0 ) np++; for( i = 0; i < np; i++ ) { if( i == np - 1 ) lun = resto; else lun = MAX_BLT_SIZE;#ifndef NEWDRIVER // exUSB.sys V. 1.3 bResult = DeviceIoControl(handle, IOCTL_EZUSB_BULK_READ, &bulkControl, sizeof( BULK_TRANSFER_CONTROL ), buffer + i*MAX_BLT_SIZE, lun, &nBytes, NULL ); #else // cyUSB.sys version 3.4.7 memset( &singleTransfer, 0, sizeof( singleTransfer)); singleTransfer.ucEndpointAddress= 0x86; bResult= DeviceIoControl (handle, IOCTL_ADAPT_SEND_NON_EP0_DIRECT, &singleTransfer, sizeof( singleTransfer), buffer + i*MAX_BLT_SIZE, lun, &nBytes, NULL);#endif if( bResult == 0 ) break; totBytes += nBytes; if( nBytes < lun ) break; } if( bResult ) return totBytes; else { DWORD ErrorCode = GetLastError(); return -(LONG)ErrorCode; }
