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Welcome |
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======= |
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To build the cc3 system, you need GNU Make and a version of GCC. The |
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system is split into 2 main parts, "hal" and "projects". |
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Inside the hal directory are more directories, one each for a |
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particular kind of hardware. |
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Currently, there is only one hal, "lpc2106-cmucam3". |
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Compiler |
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======== |
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The compiler choice is left up to the hal. This allows different hardware |
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platforms to use different compilers. |
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The normal CMUcam3 hal is "lpc2106-cmucam3", which uses a |
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version of GCC optimized for the ARM processor. To build using this |
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hal, you'll need the arm-none-eabi-* style GCC tools from |
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CodeSourcery. These can be acquired here: |
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http://www.codesourcery.com/gnu_toolchains/arm/download.html |
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Get the "EABI" or "Bare Metal" target. |
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If you feel like using a different compiler, simply change the |
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variables in hal/lpc2106-cmucam3/defs.mk to something else. A popular |
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thing to change is COMPILER_PREFIX, in case you have a custom compiler |
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built under a different name. |
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If you would like to try to use the "virtual-cam" hal, which allows for |
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prototyping on your PC either add "hal=virtual-cam" at the top of /include/common.mk or type "make hal=virtual-cam" whenever you build (including in the project directories). |
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Building |
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======== |
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Once you have the compiler, you need to build the system. From the top |
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level, invoking make will build all the hal libraries, and will build |
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a subset of items in the "projects" directory. |
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Make sure you've built a hal before trying to build any projects! |
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Changing SUBDIRS in projects/Makefile will change which projects are |
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built. Changing SUBDIRS in hal/Makefile will change which hals are |
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built. |
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Invoking make directly from a particular project or hal directory will |
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build that directory, regardless of SUBDIRS. |
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Projects |
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======== |
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There are a few projects in the projects directory to get you started. |
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The "hello_world" project should be a nice introduction to LEDs, MMC access, |
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servos, camera use, and serial communication. |
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If you want to create a project, duplicate the hello_world directory, |
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change the PROJECT variable in Makefile, and start editing code! |
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Makefiles in Projects |
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===================== |
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When using the cc3 build system, you'll be using a Makefile in your |
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project directory. See projects/hello_world/Makefile for a description |
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of how to use the file for your own projects. |
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Hal vs. Projects |
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================ |
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Generally, you will not need to make any changes to anything in hal, unless |
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you modify or create new hardware, or if the hal you are using is missing |
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some important functionality. |
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Make sure you've built a hal before trying to build any projects! If you |
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are inside the projects directory, make does not know how to go up |
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and build the hals. Otherwise, you will get an error like this: |
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No rule to make target `../../hal/lpc2106-cmucam3/libhal-lpc2106-cmucam3.a' |
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If this happens, go into the hal directory and run make. |
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Environment |
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=========== |
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The cc3 system is build upon a standard C99 environment. For the |
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lpc2106-cmucam3 hal, we use Newlib. Information about Newlib is here: |
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http://sources.redhat.com/newlib/ |
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Newlib provides all the features a C programmer expects: malloc, free, |
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printf, scanf, open, close, read, write, and friends. |
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