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Figure 13-6 Sourcing versus sinking current In many chips the sink current rating is considerably higher than the source rating because inside the chip itself there is a relatively large transistor that switches the pin directly to ground, and sinking current to ground, therefore, puts very little load on the IC itself When switched low, the pin basically becomes simply a short-circuit to ground and quite high currents can pass through it without affecting the rest of the chip Many chips can, therefore, sink much more current than they can source In the case of an ATMega we don t get this particular benefit because it s limited to 40mA per pin plus a combined limit of a total of 200mA across all the I/O pins, and the sink and source current ratings are identical.

Pause here for a few moments to play with the simple CMS and explore the Django administrative interface. Take particular note of the Documentation link that appears in the upperright corner of each page in the admin. It provides automatically generated documentation for all of the data models, URL patterns, and template tags available in your Django project. Not all of it will be immediately understandable at this point, but click around in the documentation area and get a feel for what s in there. When you re developing or working with more complex applications, the admin documentation system will be an important resource for learning about and understanding the code you re using. When you re ready to get back to work, the next chapter will be waiting for you with a guide to customizing this simple CMS and adding some useful features, including a search function.

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to make the providers registered with the new API available to the clients of the old java.security.MessageDigest class. Another aspect to pay attention to is the merging vicious circle that can result in StackOverFlowErrors. The reasons are simple: one bridge registers itself as a provider in the old API and delegates to the new providers, while another provider is included among the new ones and delegates to the old providers. As demonstrated in Figure 15-6, this can easily create an endless loop that the code will walk until it exhausts the available stack space.

Most of the time you would never even notice or care if loads you control cause micro variations in the internal voltage of the CPU, but sometimes it can come back to bite you when you least expect it For example, when measuring the level of an analog input the IC uses a carefully calibrated internal reference voltage for its ADC (Analog-to-Digital Converter) circuitry, but if you re also switching an LED or other load at the same time, the supply rail could experience enough jitter that the readings on the analog input will degrade.

Figure 15-6. Vicious flows of calls during runtime when double bridging This can be fixed in many ways. However, the most clueless fix is to use a thread local variable. Set it inside one bridge to indicate that one direction of bridging is in progress: private ThreadLocal<Boolean> searching = new ThreadLocal<Boolean>(); final boolean isSearching() { return Boolean.TRUE.equals(searching.get()); } @Override public synchronized Service getService(String type, String algorithm) { Boolean prev = searching.get(); try { searching.set(Boolean.TRUE); if ("MessageDigest".equals(type)) { Digest dig = Digest.getInstance(algorithm); if (dig != null) { return new ServiceImpl( dig, this, type, algorithm, "", Collections.<String>emptyList(), Collections.<String,String>emptyMap()); } } return null;

Not having a consistent reference voltage can seriously impact analog inputs because, for the CPU, it s like trying to measure something with a ruler made of rubber: if everything is holding still you can use it just fine, but if the ruler is being alternately stretched and contracted very rapidly by even a small amount it s very hard to get a good reading So having external loads connected to their own supply rails (possibly even with independent smoothing capacitors) and just using the CPU to switch them to ground is generally a good habit to get into, even when you re dealing with relatively low-current loads such as LEDs The third design choice that might seem strange is the value of the current-limiting resistors on the debug LEDs Most LEDs are designed to operate at a current of around 15 to 20mA and drop about 18V..

he simple CMS you put together in the last chapter is already in pretty good shape; it s something that most developers wouldn t mind showing to clients as an initial prototype, for example. But so far it s just using a few stock applications bundled with Django and hasn t added any extra features on top of that. In this chapter, you ll see how to take this simple project as a foundation and start adding your own customizations, like rich-text editing in the admin and a search system for quickly finding particular pages.

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