[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:               Need Info => In Progress            

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Follow-up Comment #4:

For another test, I tried the attached testcase.  It sets 
the clock prescaler to 32 (= 250 kHz clock using default 
fuses), makes timer 1 overflow each 256 ms to toggle a LED, 
and puts the device on sleep otherwise.

I need to specify -B20 on the commandline (50 kHz ISP clock), 
but otherwise, the USBtiny works fine with this constellation.

OTOH, since after a reset, the device is being clocked with 
the default clock according to the fuses (i.e., 1 MHz), it 
is somewhat surprising that -B20 is needed which in turn 
slows down the entire ISP.  I'll try analyzing that a bit more.

(file #29099)
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Additional Item Attachment:

File name: t45.c                          Size:0 KB


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