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if(MIDDLE_BUTTON_PRESSED && LEFT_BUTTON_PRESSED) { needBacklight(true); trip_reset(TANK, true); } Pressing the middle and right buttons together invokes the trip reset screen, and then also gives an option to reset the outing as well. The different trip types are used for tracking fuel consumption and economy for different durations. else if(MIDDLE_BUTTON_PRESSED && RIGHT_BUTTON_PRESSED) { needBacklight(true); trip_reset(TRIP, true); trip_reset(OUTING, true); } Pressing the left and right buttons together causes the text labels for the currently displayed PIDs to be shown. There isn t enough room on the LCD to show PID names and values at the same time, and after a while you ll remember what each value represents anyway, but being able to press left and right together and have the names displayed momentarily can be very handy if you forget what they are. else if(LEFT_BUTTON_PRESSED && RIGHT_BUTTON_PRESSED) { display_PID_names(); } OBDuinoMega defines three screens of values, and pressing the left button alone cycles through them. else if(LEFT_BUTTON_PRESSED) { active_screen = (active_screen+1) % NBSCREEN; display_PID_names(); } The right button, if pressed on its own, cycles through brightness settings for the LCD. else if(RIGHT_BUTTON_PRESSED) { char str[STRLEN] = {0}; brightnessIdx = (brightnessIdx + 1) % brightnessLength; analogWrite(BrightnessPin, brightness[brightnessIdx]); lcd_cls_print_P(PSTR(" LCD backlight")); lcd_gotoXY(6,1); sprintf_P(str,PSTR("%d / %d"),brightnessIdx + 1,brightnessLength); lcd_print(str); delay(500); } The middle button is the menu button, and pressing it sends the sketch into the config_menu() function that we ll discuss in a moment. else if(MIDDLE_BUTTON_PRESSED) { needBacklight(true); config_menu(); }

class SignupForm(forms.Form): username = forms.CharField(max_length=30) email = forms.EmailField() password1 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) password2 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) def clean_username(self): try: User.objects.get(username=self.cleaned_data['username']) except User.DoesNotExist: return self.cleaned_data['username'] raise forms.ValidationError("This username is already in use. Please choose another.") def clean(self): if 'password1' in self.cleaned_data and 'password2' in self.cleaned_data: if self.cleaned_data['password1'] != self.cleaned_data['password2']: raise forms.ValidationError("You must type the same password each time") return self.cleaned_data def save(self): new_user = User.objects.create_user(username=self.cleaned_data['username'], email=self.cleaned_data['email'], password=self.cleaned_data['password1']) return new_user

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Figure 15-1. Runtime implementation selection Users of version 2.5 or earlier create a module that has a dependency api >= 2.5, or api >= 2.4, api >= 1.7, and so on. The dependencies depend on when the user s module was created and compiled. In modular systems, such as the NetBeans Runtime Container (the engine behind all NetBeans-based applications), you can obtain and inspect a dependency at runtime because it s usually carried with the class loader that loads the individual classes: StackTraceElement[] arr = Thread.currentThread().getStackTrace(); ClassLoader myLoader = Arithmetica.class.getClassLoader(); for (int i = 0; i < arr.length; i++) { ClassLoader caller = arr[i].getClass().getClassLoader(); if (myLoader == caller) { continue; } if (RuntimeCheck.requiresAtLeast("2.6", "api.Arithmetica", caller)) { return true; } return false; } return true; The calling class needs to have a dependency. If the dependency is lower than or equal to 2.5, the module will mimic the old functionality. As soon as the module defines a dependency on version 2.6 or later, it s clear that the module had to have been compiled against the newer version. Either there was a conscious decision to move to a newer version, or the module was written against the new version when it was initially created. In any case, there is no reason to try to simulate the old behavior present until version 2.5.

After processing the state of the buttons, it needs to be reset so that it is ready to be updated again by the next button interrupt if(buttonState!=buttonsUp) { delay_reset_button(); needBacklight(false); } } The on-screen configuration menu invoked by the button handler is handled by the aptly named config_menu() function, and it s a monster: over 400 lines of nested if statements There s nothing especially surprising in it from a coding point of view, and you can see the whole thing in the project source code, so we won t plod through it all here One thing worth noting, though, is that changes to configuration values using the on-screen menu cause a call to the params_save() function Rather than force people to reconfigure their system by changing values in the source and recompiling, the sketch uses the nonvolatile EEPROM inside the ATMega CPU to store config parameters.

only request a refresh of all the drives This was inefficient, because a small change on the local hard drive might trigger extensive checks on all the network drives Obviously, this was not a fast process That is why we decided to change the mapping and create one virtual filesystem for each Windows system s disk No changes in signatures or new methods were needed Just a small shift in internal implementation At least, that s what might have been assumed However, users of the API had a different opinion We received many bug reports because a lot of code using that API was suddenly broken Its maintainers were quite upset: I haven t touched this module for months and now it has suddenly stopped working! How can you do that to me , and so on.

This means it s possible to reconfigure it using on-screen menus, pull out the power, plug it back in, and all your settings will still be in place Even the ATMega168 has 512 bytes of EEPROM, which is plenty for this project The ATMega328P has 1KB and the ATMega1280 has 4KB, so they have more than enough Because the config parameters are kept in a global variable during operation, it s quite straightforward to copy them into EEPROM The params_save() function doesn t even need any arguments passed to it The function declares a variable to hold the CRC (cyclic redundancy check) value that is used to verify that the data has not been corrupted, then calculates the CRC value by looping through the params variable and adding each byte.

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