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README
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------------------------------------------------------------------------------
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The libopencm3 project aims to create an open-source firmware library for
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various ARM Cortex-M3 microcontrollers.
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Currently (at least partly) supported microcontrollers:
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- ST STM32F1 series
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- ST STM32F2 series
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- ST STM32F4 series
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- NXP LPC1311/13/42/43
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The library is written completely from scratch based on the vendor datasheets,
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programming manuals, and application notes. The code is meant to be used
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with a GCC toolchain for ARM (arm-elf or arm-none-eabi), flashing of the
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code to a microcontroller can be done using the OpenOCD ARM JTAG software.
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Status and API
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--------------
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The libopencm3 project is currently work in progress. Not all subsystems
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of the microcontrollers are supported, yet.
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IMPORTANT: The API of the library is NOT yet considered stable! Please do
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not rely on it, yet! Changes to function names, macro names etc.
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can happen at any time without prior notice!
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Building
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--------
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$ make
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You may want to override the toolchain (e.g., arm-elf or arm-none-eabi):
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$ PREFIX=arm-none-eabi make
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For a more verbose build you can use
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$ make V=1
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Example projects
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----------------
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The library ships with a few small example projects which illustrate how
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individual subsystems of the microcontrollers can be configured and used with
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libopencm3.
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For flashing the 'miniblink' example (after you built libopencm3 and the
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examples by typing 'make' at the top-level directory) onto the Olimex
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STM32-H103 eval board (ST STM32F1 series microcontroller), you can execute:
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$ cd examples/stm32/f1/stm32-h103/miniblink
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$ make flash
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The Makefiles of the examples are configured to use a certain OpenOCD
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flash programmer, you might need to change some of the variables in the
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Makefile if you use a different one.
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You can also flash manually like this:
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$ openocd -f interface/jtagkey-tiny.cfg -f target/stm32f1x.cfg
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$ telnet localhost 4444
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> reset halt
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> flash write_image erase foobar.hex
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> reset
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Replace the "jtagkey-tiny.cfg" with whatever JTAG device you are using, and/or
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replace "stm32f1x.cfg" with your respective config file. Replace "foobar.hex"
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with the file name of the image you want to flash.
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Installation
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------------
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$ make install
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This will install the library in /usr/local. If you want to install it
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elsewhere, use the following syntax:
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$ DESTDIR=/opt make install
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The recommended location is to install into your toolchain directory, e.g.
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/home/someuser/sat for a toolchain built using the summon-arm-toolchain
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script from https://github.com/esden/summon-arm-toolchain.
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$ DESTDIR=~/sat make install
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Coding style and development guidelines
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---------------------------------------
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See HACKING.
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License
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-------
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The libopencm3 code is released under the terms of the GNU Lesser General
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Public License (LGPL), version 3 or later.
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See COPYING.GPL3 and COPYING.LGPL3 for details.
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Mailing lists
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-------------
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* Developer mailing list (for patches and discussions):
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https://lists.sourceforge.net/lists/listinfo/libopencm3-devel
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* Commits mailing list (receives one mail per 'git push'):
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https://lists.sourceforge.net/lists/listinfo/libopencm3-commits
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Website
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-------
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http://libopencm3.org
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http://sourceforge.net/projects/libopencm3/
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