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The GCC compiler, like the kernel, is designed for portability. Like all open source programs, GCC is available in source form, and you can compile the code to create your own compiler. Part of the compilation process of GCC involves configuring the project; during that step, you can configure GCC to produce code for a different target processor and thus become a cross-compiler. However, the compiler is only one part of the tool chain necessary to produce running code. You must also get a linker, a C standard library, and a debugger. These are separate, albeit related, projects in Linux. This separation is vexing for engineers used to tools from a certain company in Redmond, Washington, where the tools are monolithic in nature. But not to worry; when you re working on an embedded project, this separation is an advantage, because the additional choice lets you select the right tool for your application. The GCC compiler installed on your host machine is preconfigured to use the GNU C Standard Library, frequently called glibc. Most embedded projects use an alternate, smaller library called uClibc for embedded development; it s discussed later in this chapter.

If you want to remove the domain name you just configured, you can do so simply by clicking the Unconfigure button, shown in Figure 11-21.

The GNU Debugger (GDB) project deserves a special mention. It s the most commonly used debugger on Linux systems. Although it s frequently included in the tool chain, GDB is a separate, independent project. For embedded development, GDB is compiled so that it can debug code running on a different processor than the debugger, much like GCC can cross-compile code. This sort of debugging adds another complication: the machine running the debugger is rarely the machine running the code to be debugged. Debugging code in this fashion is called remote debugging and is accomplished by running

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Note Although well-written games should still be playable at slow frame rates, people will be put off playing it if the motion is too jerky. Personally I wouldn t want to play a game that ran much under 15 frames per second.

Caution If you click the Unconfigure button, you are given no warning about what you are about to do.

the program to be debugged with a stub program that communicates with another host where the debugger is running. The stub program in this case is gdbserver, and it can communicate by serial or TCP connection with a host running GDB. Using gdbserver also has practical considerations because at only 100KB, give or take, it s small enough in terms of size and resources required when running on even the most resource constrained targets.

BusyBox is a multicall (more later on what this means) binary that provides many of the programs normally found on a Linux host. The implementations of the programs are designed so that they re small both in size but also with respect to how much memory they consume while running. In order to be as small as possible, the programs supply a subset of the functionality offered by the programs running on desktop system. BusyBox is highly configurable, with lots of knobs to turn to reduce the amount of space it requires; for example, you can leave out all the command-line help to reduce the size of the program. As for the multicall binary concept, BusyBox is compiled as a single program. The root file system is populated with symlinks to the BusyBox executable; the name of the symlink controls what bit of functionality BusyBox runs. For example, you can do the following on an embedded system: $ls -l /bin/ls /bin/ls -> /bin/busybox When you executes /bin/ls, the value of argv[0] is "/bin/ls". BusyBox runs this argument through a switch statement, which then calls the function ls_main(), passing in all the parameters on the command line. BusyBox calls the programs it provides applets.

Straight-line motion is useful, but a game would likely get pretty dull if everything moved horizontally or vertically. We need to be able to move a sprite in any direction we choose, which we can do by adjusting both the x and the y coordinate for each frame. Listing 5-4 sets a sprite moving in diagonal direction by adding time-based movement to both coordinates. This listing also adds some trivial collision detection. Rather than push the sprite back to an initial position when it goes over the edge, the sprite bounces in the opposite direction. Listing 5-4. Simple Diagonal Movement (diagonalmovement.py) background_image_filename = 'sushiplate.jpg' sprite_image_filename = 'fugu.png' import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) background = pygame.image.load(background_image_filename).convert() sprite = pygame.image.load(sprite_image_filename).convert_alpha() clock = pygame.time.Clock() x, y = 100., 100. speed_x, speed_y = 133., 170. while True: for event in pygame.event.get(): if event.type == QUIT: exit() screen.blit(background, (0,0)) screen.blit(sprite, (x, y)) time_passed = clock.tick(30) time_passed_seconds = time_passed / 1000.0 x += speed_x * time_passed_seconds y += speed_y * time_passed_seconds

The final section of the Remote Access area is Web Site Settings. This area enables you to set the web site home page and the web site headline, as shown in Figure 11-22.

N ote If you re new to Linux (or Unix-like operating systems), a symlink (symbolic link) is a new concept. A

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