Hello,
in message.c file I found following comment:
* That capability is less useful for low or full
* speed interrupt endpoints, which allow at most one packet per millisecond,
* of at most 8 or 64 bytes (respectively).
dfu-util transfers 1023 bytes blocks with libusb:
result = usb_control_msg( device,
/* bmRequestType */ USB_ENDPOINT_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
/* bRequest */ DFU_UPLOAD,
/* wValue */ transaction++,
/* wIndex */ interface,
/* Data */ data,
/* wLength */ length, /* usually 1023 bytes */
dfu_timeout );
USB device is:
T: Bus=02 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 5 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=fe(app. ) Sub=01 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1e96 ProdID=ffff Rev=53.63
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=00 Driver=(none)
According to USB sniffer it transfers data much faster than 64byte
packet per ms. How can I limit it? Can it be because of data are
transfered between host and interface (not endpoint)?
My device does not work if I transfer data faster than 64bytes/ms. I
sniff Windows and MacOSX:
- MacOSX trasnfers data faster and device does not work
- Windows transfers data at 64b/ms speed and device works ok.
(device does not work means device is disconnected after small amount
of data transfered with -ETIMEDOUT, -ENXIO or some other error)
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