UNO R3 ISP trouble (ATtiny45)

winter14:

[quote author=Coding Badly link=topic=119392.msg898710#msg898710 date=1345494377]
The project is not intended to be used with the Arduino IDE. If you rename firefly.c to firefly.pde and remove the non-source files (like the dot-hex file) the Arduino IDE may be able to build the project.

I don't understand what you mean by this. [/quote]

Which one of the three items do you not understand?

I tried changing the name of the file and it just added the .c back on the end.

Why did you append a dot-c?

Roberts-MacBook-Pro:~ robertwinter$ avrdude -c arduino -p t45 -U flash:w:firefly.hex
avrdude: ser_open(): can't open device "unknown": No such file or directory
ioctl("TIOCMGET"): Inappropriate ioctl for device

avrdude done. Thank you.

You did not specify the serial port. I believe -P (dash-uppercase-P) is the argument.