require more bytes

[sun tony]

Dear SIRs:

I bought a labtool hardware and developed  some kind of application base on source code(LPCXPRESSO & QT),

I have other labtool application require more than 512 bytes at one time transfer data from PC to labtool via usb,

From my study of source code , I found the limit was define by fw/program/usb_descriptors.h

/*! Size in bytes of the LabTool data endpoints. */

#define LABTOOL_IO_EPSIZE         512

But I modify this value more than 512 and try to send some data,

Here  always get transfer error timeout, during the callback 

Unknown command: Got transfer error: The USB communication with the LabTool hardware timed out!

Can any one help to notice me about this requirement?

Is it limit because LPC4370 the USB maximum packet size ?

Endpoint type Speed      Packet size (byte)

Bulk          High-speed 8, 16, 32, 64, or 512

Thanks!