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Where are the source files containing the definitions and the HAL functions located for the Due?

I am trying to do CMSIS programming.

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    There is an interesting discussion about Hardware Abstraction Layers (HAL) on Reddit’s r/Arduino. They assert that the Arduino environment as a whole is a HAL. reddit.com/r/arduino/comments/2y61su/… Commented Oct 3, 2021 at 4:16
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    There is also an interesting discussion on the Arduino forum about getting started with the common microcontroller interface standard (CMSIS) forum.arduino.cc/t/anyone-using-cmsis-how-to-get-started/226150 Commented Oct 3, 2021 at 4:24
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    Also there are a number of CMSIS libraries available for Arduino. Commented Oct 3, 2021 at 4:26

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The Arduino Core for supporting Arduino Due is called ArduinoCore-Sam, which can be found at https://github.com/arduino/ArduinoCore-sam, inside the system directory, you will find the CMSIS device driver.

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