tinySPI - Arduino hardware SPI library for ATtiny44/84, 45/85, 461/861, 2313/4313.

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tinySPI is an Arduino SPI master library for ATtiny microcontrollers that utilizes the USI hardware in the ATtiny MCUs. Supported MCUs include ATtiny 44/84, 45/85, 461/861, 2313/4313. Because the USI hardware is not as sophisticated as the dedicated SPI hardware in the ATmega MCUs, tinySPI is more limited than the standard Arduino SPI library but still has several advantages over software bit-bang approaches.

https://github.com/JChristensen/tinySPI

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