[avrdude-dev] [bug #37768] Poll usbtiny 100 times at init time to handle low-clock devices

[Joerg Wunsch]

Update of bug #37768 (project avrdude):

                  Status:                    None => Need Info              
             Assigned to:                    None => joerg_wunsch           

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Follow-up Comment #1:

I'm not completely reluctant to accept the patch, but in 
trying to reproduce the problem, I failed so far.

First, I picked an ATmega16, and clocked it externally down 
to 100 kHz.  Running AVRDUDE with the USBtinyISP and the 
argument -B100 (resulting in a 10 kHz ISP clock) allowed me 
to successfully connect to it.

Then, I picked an ATtiny45, and changed the low fuse to 
0xe4, resulting in it being clocked from the 128 kHz watchdog 
oscillator.  Again, using -B100 gave me a success in 
connecting.

Finally, I changed the low fuse of the 'tiny45 to 0x64, so 
the 1:8 prescaler is active, resulting in a total CPU clock 
of 16 kHz.  Obviously, -B100 is still too fast now, but 
-B1000 (1 kHz ISP clock) makes it work again.

Am I missing something?

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