LibOpenCM3

Open-Source lowlevel hardware library for ARM Cortex-M3 microcontrollers (but also M0, M4 are supported and more to come)

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LibOpenCM3

The libopencm3 project (previously known as libopenstm32) aims to create a free/libre/open-source (LGPL v3, or later) firmware library for various ARM Cortex-M3 microcontrollers, including ST STM32, Toshiba TX03, Atmel SAM3U, NXP LPC1000, EFM32 and others.

Documentation

Up to date information is available in the GitHub wiki

from the mailing list libopencm3-devel@lists.sourceforge.net and the IRC channel (libera.chat, #libopencm3).

Doxygen

Daily updated autogenerated API documentation for developers: