TinyISP Pin diagram

[RichardO]

Hi

I am trying to use this library but am nut sure which Pins/Ports to use for my ATTiny85.

Can you put together a quick diagram (in text will do)

Also
1: What pin is used for SS?
2: Are you using an interrupt, if so, what pin are you using.

[aldantas]

Hello, the pins are defined here https://github.com/augustold/TinySPI-Arduino/blob/master/tiny_usi_pins.h
For ATTiny85, they are:

• MISO - PB0
• MOSI - PB1
• SCK - PB2

Such as the default Arduino's library, and most SPI libraries I've seen, it's up to you to define the SS and the interrupt (if being used) pins. Just remeber to set the SS to low before starting the transfering and to high afterwards. This is done outside the library because you could have multiple slave devices.

Also, this library is intended to mantain the Arduino's library layout, so you could use example and tutorial codes without modifying them. If that's not a feature you would like, I suggest taking a look at this library https://github.com/CELTAB/AVR-Util/tree/master/avrutil, which have a way simpler SPI implementation. Just take the spi.[h/c] and spitn84.[h/c] codes and use them inside your project. Don't forget to modify the defined pins at spitn84.h according to the ATTiny85 pinout. You could also set the default SS pin, wich is called CSN in this library.