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[avrdude-dev] [bug #18529] Low write speed with usbasp programmer (40 by

From: anonymous
Subject: [avrdude-dev] [bug #18529] Low write speed with usbasp programmer (40 byte/s)
Date: Fri, 15 Dec 2006 17:42:40 +0000
User-agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)


                 Summary: Low write speed with usbasp programmer (40 byte/s)
                 Project: AVR Downloader/UploaDEr
            Submitted by: None
            Submitted on: Friday 12/15/2006 at 17:42 UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: jim doe
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any



Howdy folks,
I've just put together this usbasp programmer (mega8, xtal, and
 some cables).

I see good read speeds (6 kbyte/s), but the write speed seems to 
be 'wrong' (40 byte/s).

I get this message in the kernel log every 5 seconds:

kernel: usb 2-2.2: avrdude timed out on ep0out len=200/200

This timeout does not cause any data problems! (Verify is OK)

I think something is wrong with the function usbasp_transmit in 
the file usbasp.c. It seems that the call to usb_control_msg()
is the one that times out after 5000 ms.

I can increase the write speed by lowering the timeout value,
but I don't think thats the right way to do it.

I did the test on x86 linux 2.6.15 with an intel uhci and libusb-0.1.12.

The programmer runs the usbasp.2006-09-16.hex firmware.


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