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Where are sources
STM32 core sources files location
By installing the stm32 core thanks the Boards Manager, the extracted package is located here:
Go to the local Arduino directory.
The location is displayed in the "Preferences" dialog.
It should be:
c:\Documents and Settings\\<USERNAME\>\Application Data\Arduino15\(Windows XP)
Then, go to "<local Arduino directory>/packages/STM32/hardware/stm32/" directory.
Directory named with the STM32 Core version installed is present. Example: 2017.6.2 or 1.0.1
STM32 Tools files location
Go to the local Arduino directory. See above.
Then, go to "<local Arduino directory>/packages/STM32/tools/STM32Tools/" directory.
Directory named with the STM32 Tools version installed is present. Example: 2017.5.12 or 0.1.0