ATTinyCore, how do I use it?

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I downloaded ATTinyCore-master.zip, unzipped it into the sketch library. There were immediately errors in Arduino IDE about missing header files. In ATTinyCore/avr/libraries I found several ‘sub-libraries’ with header files, some directly under the ‘sub-library’ and some under folder src. How do I use ATTinyCore library, pick out the ‘sub-libraries’ I need or how should it be done?

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It’s not a library, it’s an Arduino core, the basis of everything. In PlatformIO terms, it’s a framework. (Other possible frameworks besides Arduino would e.g. be Simba or mbed-os etc.). In order to use on particular Arduino core, there has to be PlatformIO support behind it.

In this case, there is. PlatformIO supports the latest 1.5.2 release version of https://github.com/SpenceKonde/ATTinyCore, and it designates the the package name framework-arduino-avr-attiny to it. Board definitions use it by specifying the core: "tiny" attirbute together with the variant.

The variant in turn maps to one of the possible board variants listed in the core, per https://github.com/SpenceKonde/ATTinyCore/tree/master/avr/variants in this core.

So, of you use board = attiny84 in the platformio.ini, you already get the ATTinyCore Arduino core in the latest release version.

The files of the Arduino core is locally under C:\Users\<user>\.platformio\packages\framework-arduino-avr-attiny in the standard configuration.

There have also been no code changes since the release, just documentation updates. So updating the core version to the bleeding-edge version from the Github page will have no functional effect. (Compare release date with commits since then.

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