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HOST.print("Unrecognized command '"); HOST.print(readChar); HOST.println("'"); HOST.println("1 - Start logging"); HOST.println("2 - Stop logging"); HOST.println("3 - Display logfile"); HOST.println("4 - Delete logfile"); HOST.println("5 - Directory listing"); HOST.println("6 - Reset VDIP module"); HOST.print("> "); } } } The final two functions at the end of this file are really just wrappers for Serial.print() and Serial.println(), which might sound like a waste of time but it helps to simplify code elsewhere in the sketch. Because the OBDuinoMega sketch is designed to support being built without support for a serial connection to the host, these functions allow us to place calls that send messages to the host throughout the sketch without worrying about whether a host serial connection even exists. The functions themselves wrap their internal functionality inside #ifdef MEGA checks so that if the sketch is not built specifically for a Mega target, they will simply accept whatever is passed to them and immediately exit without doing anything. However, if the sketch was built for a Mega target, these functions invoke print() and println() to the appropriate serial port. void hostPrint( char* message ) { #ifdef MEGA HOST.print(message); #endif } void hostPrintLn( char* message ) { #ifdef MEGA HOST.println(message); #endif }

With this template in place, you now have literally a simple dynamic content management system that will let you define as many pages as you d like, title them, fill in content, and place them at any URL (except for URLs starting with admin/ because they ll be matched by the URL pattern for the admin interface). You could, if you wanted to, dress up the template with fancier HTML and a nice cascading style sheet (CSS), create a few more user accounts through the administrative interface, and deploy this onto a live web server for real-world use. But so far, you ve only written a couple of lines of actual code: the URL pattern for the pages in your urls.py file, a few Django settings, and a little HTML. Obviously, it won t always be quite this easy to get an application up and running with Django, but hopefully you ve seen that taking advantage of Django s components can significantly cut down the amount of work you have to do.

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@Override protected void engineUpdate( byte[] input, int offset, int len ) { ByteBuffer bb = ByteBuffer.wrap(input); bb.position(offset); bb.limit(offset + len); res = dig.digest(bb); } @Override protected byte[] engineDigest() { return res; } @Override protected void engineReset() { dig = Digest.getInstance(getAlgorithm()); } }; }

possible even if it does feel a little uncomfortable at first. And this gives us a good excuse to explain why many engineers prefer to do it this way! The output pins on a chip such as an ATMega CPU are rated to source (supply) or sink (accept) up to a certain limited amount of current. Sourcing current means supplying current to pass out through the pin of the chip and then through the load (a resistor and an LED in this case) to ground. Sinking current means having current come from the +5V supply and then through the resistor and LED, then into the pin, and from there straight to ground inside the IC (see Figure 13-6).

} } This is a bit more verbose, as the old API uses the classic factory class design instead of the singletonizer. As a result, you need to implement multiple classes instead of just one. The biggest problem is the registration. Somehow the BridgeToOld class needs to be registered. Putting it into META-INF/services/java.security.Provider doesn t work. Another proprietary and more complicated declarative registration mechanism is available, or you can just make sure that the static bridge registers itself when loaded into memory. This is done in the test by a dummy call to the following: // The java.security.Providers cannot be registered in META-INF/services. // That is why we need to either configure various properties or // make some dummy call that will initialize our bridge class. // Then the bridge class registers itself as a MessageDigest provider // in its constructor. // // This is the call: Digest initialize = Digest.getInstance("MD5"); It s not pretty, but at least your code doesn t need to depend on the bridge classes directly. Hopefully one day the registration of the security providers will be standardized to also use the Java Extension Mechanism. Then it will be enough to include the bridge JAR on the classpath

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