154 lines
4.8 KiB
Plaintext
154 lines
4.8 KiB
Plaintext
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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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TIP: Include this repository as a GIT submodule in your project. To make sure
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your users get the right version of the library to compile your project.
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For how that can be done refer to the libopencm3-examples repository.
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Prerequisites
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-------------
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Building requires python, and a python YAML module. (Some code is generated)
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For Ubuntu
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$ [sudo] apt-get install python-yaml
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For Fedora
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$ [sudo] yum install PyYAML
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For Windows
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Download and install:
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msys - sourceforge.net/projects/mingw/files/MSYS/Base/msys-core/msys-1.0.11/MSYS-1.0.11.exe
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Python - http://www.python.org/ftp/python/2.7/python-2.7.msi (use installer to get the right registry keys for PyYAML)
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PyYAML - http://pyyaml.org/download/pyyaml/PyYAML-3.10.win32-py2.7.exe
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arm-none-eabi toolchain - for example this one https://launchpad.net/gcc-arm-embedded
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Run msys shell and set the path without standard Windows paths, so Windows programs such as 'find' won't interfere:
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export PATH="/c//Python27:/c/ARMToolchain/bin:/usr/local/bin:/usr/bin:/bin"
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After that you can navigate to the folder where you've extracted libopencm3 and build it.
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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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Fine-tuning the build
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---------------------
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The build may be fine-tuned with a limited number of parameters, by specifying
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them as environment variables, for example:
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$ VARIABLE=value make
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* FP_FLAGS - Control the floating-point ABI
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If the Cortex-M core supports a hard float ABI, it will be compiled with
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floating-point support by default. In cases where this is not desired, the
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behavior can be specified by setting FP_FLAGS. Currently, M4F cores default
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to "-mfloat-abi=hard -mfpu=fpv4-sp-d16" and others to no FP flags
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Examples:
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$ FP_FLAGS="-mfloat-abi=soft" make # No hardfloat
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$ FP_FLAGS="-mfloat-abi=hard -mfpu=magic" make # New FPU we don't know of
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Example projects
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----------------
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The libopencm3 community has written and is maintaining a huge collection of
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examples, displaying the capabilities and uses of the library. You can find all
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of them in the libopencm3-examples repository:
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https://github.com/libopencm3/libopencm3-examples
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Installation
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------------
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$ make install
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This will install the library into /usr/local. (permissions permitting)
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If you want to install it elsewhere, use the following syntax:
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$ make DESTDIR=/opt/libopencm3 install
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If you want to attempt to install into your toolchain, use this:
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$ make DETECT_TOOLCHAIN=1 install
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Note: If you install this into your toolchain, you don't need to pass
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any extra -L or -I flags into your projects. However, this also means
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you must NOT pass any -L or -I flags that point into the toolchain. This
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_will_ confuse the linker. (ie, for summon-arm-toolchain, do NOT pass
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-L/home/user/sat/lib) Common symptoms of confusing
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the linker are hard faults caused by branches into arm code.
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You can use objdump to check for this in your final elf.
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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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IRC
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---
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* You can reach us in #libopencm3 on the freenode IRC network.
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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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