Library Noob Question: How do I view or download library source code?

[protovtol]

Where do I find SD.cpp or SPI.cpp?

Thanks

[Juraj]

on your computer. turn on verbose mode for compilation and compile ('Verify') some example for the library from IDE Examples menu. you will see the paths in the console.

[johnwasser]

On a Mac you can find them in: /Applications/Arduino.app/Contents/Java/libraries/SD/src/SD.cpp
/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/SPI/src/SPI.cpp

When you install AVR board updates, look for SPI in:
Users/username/Library/Arduino15/packages/arduino/hardware/avr/version/libraries/SPI/src/SPI.cpp

Yes, they are buried deep.

[protovtol]

Solved.

Thanks!