Accessing USB Programmer With avrdude

[John Summerfield]

Robert L Cochran wrote:
> John Summerfield wrote:
>> Robert L Cochran wrote:
>>> I'm having trouble trying to access a USB device under Fedora 7. I think
>>> udev might be my problem.
>>>
>>> When I try using avrdude with this line:
>>>
>>> [rlc at bobcp4 atmega644]$ avrdude -c usbtiny -p m644 -P usb -U
>>> flash:w:blink_pb3.hex
>>>
>>> I get this error message:
>>>
>>> avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)
>> Try with a leading zero. .../0x0c9f
>>
> I got frustrated and tried this on Microsoft Windows XP...I have this
> working on XP -- avrdude definitely detects the programmer device and
> then it is able to initialize the target microcontroller through the

That rules out a lot of the potential problems.

Did you try the leading zero? It would surprise me not at all if some 
critical software's doing a character compare, and even if it's 
converting to binary, there are two ways to convert 0xcf8 one = 0x0cf9 
and the other 0xcf90. Which correct is a matter of definition.

> programmer. On Fedora 7, it cannot detect the programmer at all, and I
> think that is either because there is a udev rules problem, or avrdude
> was built without libusb support. Maybe I should get the source rpm and
> check into that.

I would expect it to run without udev. I would expect lsusb to see the 
device, and when you modprobe the driver, the driver should see it.

udev is icing, it's no good without the cake.


> 
> I will try to put up a web page with photos of the programmer connected
> to a breadboard with the target mcu (an ATMega644) and a test circuit to
> play with...specifically an LED connected to pin PB3 that I want to blink.

It won't mean anything to me:-)

-- 

Cheers
John

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