Only one change was required to the original Wire version (written by LeafLabs), which was to fix an issue where it would not work with the I2C scanner With direct GPIO access the speed could easily be increased beyond 400kbps, however at the moment, no one has requested this, or looked into speeding up Wire. The default speed is 250kbps, and the fastest that can be achieved by minor changes to the Wire library somewhere under 400kbps. The advantage of a software approach is that Wire can be run on any GPIO pins on the board (that are not used for other specific purposes e.g. The version of Wire that is currently used, is software / “big banged”, and doesn’t use the hardware I2C features of the STM32 The library's source code will either be found there or else in the src subfolder.The Wire (I2C) library is part of the Arduino STM32 files download, as it is almost a core part of the Arduino suite of libraries You can now navigate up a couple of folder levels to get to the library root folder. This will open the example sketch's folder under the examples subfolder of the library folder. Select Sketch > Show Sketch Folder from the Arduino IDE's menus.Open any example sketch from the library you want to find.Select File > Examples from the Arduino IDE's menus.This isn't apparent to the user because the libraries have a standardized API. So the Wire library that is used when compiling for the Uno is completely different from the one used when compiling for the Nano 33 IoT, and so on. Each boards platform has its own version of the Wire library. Note that you might have multiple versions of a library installed on your computer and the active version may depend on which board you compile for.
Select the board you are interested in from from the Arduino IDE's Tools > Board menu.Hi I'll share a technique you can use to find the location of most any library.
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