I'm working on a little project here and really need some advice.
1. Is there a butterfly bootloader that uses very little memory and can select between two/three or more programs by selectiong it with the joystick?
2. What possibilities are there to make a secondary 3,3v RS232 115000 (only needs txd/rxd) port on the butterfly.
If possible some kind of ready made program and little overhead.
I am planning to connect a 3.3v rs232 comms module to the butterfly but i would really like to use a secondary RS232 port for it.
The first program would be passthrough(talk to the comms module) and the secondary program would be the actual avr program that uses the comms module with debug info on the original com port.