tinySPI is an Arduino SPI master library for ATtiny24/44/84, 25/45/85, 261/461/861, 2313/4313 MCUs.
tinySPI utilizes the USI hardware in the ATtiny MCUs; it is smaller and significantly faster than shiftOut().
Maintainer: Jack Christensen
This library is compatible with the avr architecture so you should be able to use it on the following Arduino boards:
To use this library, open the Library Manager in the Arduino IDE and install it from there.