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If you want to link statically, use the following command for the previous example: <cross-compiler>-gcj simpleProgram.java \ -static-libgcj -o test-java main=simpleProgram Depending on the size of the program, static linking may make sense. For example, the simple example program, when statically linked, is about 12KB in size, which is a much smaller footprint than the size of libgcj.so.

Most embedded development has been done in C/C++ and Java. These languages can be configured to produce very resource efficient programs. However, when you re designing a board, the cost differential between 512MB and 1GB of RAM is just a few pennies, and flash memory is priced the same; saving a few 100KB here and there isn t as important as it used to be. In combination processors that are much more powerful, wringing the most out of every processor cycle also isn t as important. The engineering time value involved in optimizing code is much greater than adding a little more processing power, memory, and storage. One of the ways to make the best out of your time is to pick the highest-level language for the job and let the underlying language or runtime environment handle the details. The following languages fall into the high-level category in that you don t need to worry about the underlying machine much when you re coding. Several commercial embedded systems use these languages as their primary development tool, so the information in this section isn t to illustrate that these can possibly be used but to let you know that these are practical alternatives to C/C++/Java.

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1. From your Internet browser, go to the following URL: http://www.microsoft.com/ windows/using/tools/igd. 2. On the Internet Connectivity Evaluation Tool start screen, shown in Figure 11-1, read through all the instructions that are displayed onscreen to ensure that you know about the tests. 3. Check the I Have Read and ACCEPT the Terms of the License Agreement check box. 4. Click the Continue button.

def run(): pygame.init() screen = pygame.display.set_mode(SCREEN_SIZE, HWSURFACE|OPENGL|DOUBLEBUF) resize(*SCREEN_SIZE) init() clock = pygame.time.Clock() # Read the model tank_model = model3d.Model3D() tank_model.read_obj('mytank.obj') rotation = 0.0 while True: for event in pygame.event.get(): if event.type == QUIT: return glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) time_passed = clock.tick() time_passed_seconds = time_passed / 1000.0 glLoadIdentity() glRotatef(15, 1, 0, 0) glTranslatef(0.0, -1.5, -3.5) rotation += time_passed_seconds * 45.0 glRotatef(rotation, 0, 1, 0) tank_model.draw_quick() pygame.display.flip() if __name__ == "__main__": run() The init function in Listing 11-8 enables the OpenGL features we will be using. It also sets parameters for the material and light, which will give the tank a metallic look. We will cover material and lighting parameters in the next chapter.

Python is a high-level, object-oriented, compiled language that runs on a Python virtual machine. The code runs anywhere a Python virtual machine is available. Python is a language that isn t high performance: the goal is to make code that is easy to read and debug. For applications where performance isn t paramount, Python is a great approach for development. Python s core language is very simple with an extensive library, built from Python code. You can find the library of Python code at /usr/lib/python< version >. This directory contains both the source code and the object code; if you re new to python, it s an excellent educational tool. Python structures its code into many small library files, making the language adaptable for embedded development; you can put just the libraries used for the project on the target.

Figure 11-1. Read the Internet Connectivity Evaluation Tool start screen and accept the License Agreement.

To use Python in an embedded project, you must build the Python virtual machine for the target. That virtual machine is built with a cross-compiler. To build Python, you need a cross-compiler built as explained in the previous chapter with the glibc library, but you can t use the uClibc C library to build the Python virtual machine. First, obtain and download the source code: $ wget http://www.python.org/ftp/python/< version >/Python-< version >.tgz $ tar xzf Python-<version>.tgz You can find the list of current Python releases at http://www.python.org/download/releases/. The latest version of Python is 3.2.1. The 3.0 line of Python contains enough new features that some older code written for Python 2.x won t compile or run, and this has stopped users from switching. Because the 2.x line of Python is more popular, version 2.6.2 is used as the example version.

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