Hi!
I have started a new project including a 1284P with Maniacbugs bootloader.
This is my first time I use the 1284P.
Right now I am soldering all necessary components to my board. I am confused about the I2C pins.
Should I connect my I2C devices to pins "23 PC1 (D 17)" (SDA) and "22 PC0 (D 16)" (SCL)?
Will the wire library work without any modification?
I really want to do all soldering before I burn the bootloader and upload my software (tested on a atmega328p).
I also have a another question: I use both 5v and 3.3v I2C devices.
The pullup resistors (4.7k) for SDA and SCL is connected to 3.3v. I have modified the twi.c file and removed the part including internal pullup resistors.
What could happen if the internal pullup resistors should be activated? Would it damage the connected 3.3v device?
/Olof