As Michael wrote to me, you actually need a hacked version of libusb0.sys for any composite USB device (FT2232) to work... It's just asking for trouble IMHO...
http://www.nabble.com/LibUSB---composite-USB-devices-td11027391.html Add that libusb cannot be compiled on Windows and you need to use libusb-win32, which is 2 y.o. now and only 0.1.12... When someday OpenOCD switches to newer libusb, what will happen to windows support? Will that be dropped, for the sake of GPL? Anyway, about that "equal" performance with libftdi: Tested with a ~29kB image on LPC2103 (upload to flash): libftdi: > Start address 0x3c, load size 29640 > Transfer rate: 6 KB/sec, 14820 bytes/write. ftd2xx: > Start address 0x3c, load size 29640 > Transfer rate: 15 KB/sec, 14820 bytes/write. So: libftdi is 2.5x slower Tested with ~114kB image on STM32 (upload to flash): libftdi: > Start address 0x8000134, load size 114432 > Transfer rate: 8 KB/sec, 16347 bytes/write. ftd2xx: > Start address 0x8000134, load size 114432 > Transfer rate: 11 KB/sec, 16347 bytes/write. Again slower, this time only about 30%, but still, that's nowhere to "comparable" 4\/3!! _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
