[avrdude-dev] [bug #37997] AVR109 not working

[Joerg Wunsch]

Follow-up Comment #8, bug #37997 (project avrdude):

One discrepancy immediately catches attention:

The "OK" log says:


Programmer Type : avr910


The "Failed" log says:


Programmer Type : butterfly


Given the large number of device codes that are supported by 
the programming hardware, I really doubt this is actually a 
bootloader.  (Bootloaders usually support exactly one device, 
the device they are operating on.)

Did you try with both, -c butterfly (aka. -c avr109), as well 
as -c avr910?  While both implementations share the same 
roots, their behaviour is not exactly the same.

One of the consequences of this might be that in the working 
log, we can see:


avrdude_5_2: Send: T [54] ^ [5e] 


i.e. the device code 0x5e is chose, which is the correct one 
for an ATtiny2313.  In the "failed" log, we see:


avrdude: Send: T [54] . [13] 
avrdude: Recv: . [0d] 
avrdude: devcode selected: 0x13


i.e. it picks device code 0x13 which belongs to an AT90S1200. 
This is done since the bootloader implementation just picks 
the very first device code it can see, since many bootloaders 
simply don't spend much attention on the device codes they 
are claiming to support, so picking the first one is usually 
the best choice.

However, for a standalone programmer, there are subtle 
differences in the programming algorithm between AVR's 
grandfather AT90S1200, and the ATtiny2313, which might explain 
the failure.

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