Is there a way to make the newer Versions of AVRDUDE to controll the RS232 handshake lines (DTR and RTS) while using a AVR910 programmer ?
I have build a version of the AVR910 programmer, that used optocouplers at the RS232 interface. It used a positive voltage from DTR or RTS lines to power the interface side.
This worked fine with AVRDUDE 4.3 but did not with avrdude 5.0, 5.1 and 5.4.
The old versions had a positive voltage at DTR the new a negative.
As far as I could find in the source code, the handshake lines a set when setting the baudrate. So I am afraid the only solution is change in a future version of avrdude.