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When you re an engineer working on the project, items 3 and 4 are very important. Many times, the product manager responsible for the project doesn t supply sufficient detail: for example, The device must boot quickly as opposed to The device must be ready to process data in 10 seconds or less. Or you may get conflicting items like The device must store 10,000 audio files and The device must have no more than 64MB of flash. The last requirement brings up the most obvious difference in embedded development: the additional constraints introduced by the hardware itself.

When you re starting on the requirements for an embedded project, divide the list into hardware versus software constraints. Hardware requirements represent the most constraining items because they reflect equipment already in the field that can t be replaced, hardware that has been designed, or market expectations where users won t accept any other solution. Some hardware constraints are easy to spot (touch screen, wired network connectivity, CANbus support), whereas others are more subtle. For example, the following place hardware constraints on the project that may not be intuitively obvious (some are real-life examples and others are made-up see if you can tell):

Note You cannot watch video files with the .avi file extension on Xbox 360. If you want to view these files,

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One of the most basic things you can do with a surface is set individual pixels, which has the effect of drawing a tiny dot. It is rarely necessary to draw pixels one at a time because there are more efficient ways of drawing images, but if you ever need to do any offline image manipulation it can be useful. To draw a single pixel onto a surface, use the set_at method, which takes the coordinate of the pixel you want to set, followed by the color you want to set it to. We will test set_at by writing a script that draws random pixels. When you run Listing 4-7 you will see the screen slowly fill up with random-colored dots; each one is an individual pixel. Listing 4-7. Script That Draws Random Pixels (random.py) import pygame from pygame.locals import * from sys import exit from random import randint pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) while True: for event in pygame.event.get(): if event.type == QUIT: exit()

The device will operate for 6 hours once disconnected from commercial power: This was an actual requirement It was later refined to include a statement about what sort of battery would be attached to the device This requirement could be solved by attaching a car battery to the device, which was not the intent After clarification regarding the type of backup power that could be accommodated and the notion of operate, it was clear that the device needed to be a low-power chip with power management and not that much RAM memory, because that s a drain on power This influenced the language selected (C, due to the low amount of memory) and the kernel (power management was key), which had a cascading effect throughout the project.

The unit will emit no more than 15 BTUs per hour: Some equipment has a power budget, and the corollary to that is a heat budget This is another requirement that affects the amount of RAM, CPU MHz, and type of power management that must be available These sorts of requirements appear in all sorts of projects, and it s no accident that cell phones don t get too warm in your hand This was a real customer requirement The product will produce 0 decibels of sound at 3 feet: This means a couple of things: no fans for cooling, and no hard drive The device must use flash memory Home entertainment systems have requirements like this because nobody wants to hear a fan whirling during the favorite parts of their movie Automotive devices fall into this category too, because background cabin noise is a competitive factor.

1. Select Videos on the Media blade. 2. On the Video menu, select Computer, as shown in Figure 10-11.

rand_col = (randint(0, 255), randint(0, 255), randint(0, 255)) for _ in xrange(100): rand_pos = (randint(0, 639), randint(0, 479)) screen.set_at(rand_pos, rand_col) pygame.display.update()

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