.net barcode scanner sdk The Wait command The STOP command The IF ELSE structure The ability to comment out sections of code in Software

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The Wait command The STOP command The IF ELSE structure The ability to comment out sections of code
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The PC you are using is also a powerful debugging tool in that it can both send and receive information and gives you a full screen and a keyboard to use as interactive elements. The object exchange maintained by Parallax on the Internet provides a number of powerful tools to let you interact with your PC. However, the most powerful device at your command is the computer between your ears. By and large, the debugging process is an exercise in the use of the brain, and everything else that needs to happen can be done with the Propeller/Spin system and your personal computer.
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Here are some rules you need to follow to make the debugging process both easier and more likely to succeed within a reasonable amount of time:
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Rule 1: Be thinking about the debugging process as you write the code. Design the
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code so that it can be debugged. Be sure to put in the necessary hooks and connects as you go along. Rule 2: Write the code using small methods that can be tested as standalone miniprograms. Once you have the software working, you can streamline the code. Test your program as you develop it to make sure each developmental level is operational. Rule 3: Do not wait until the last moment to start the debugging process. Debug as you go along. In other words, you should debug the code as it is developed rather than waiting until it is all done and ready to be delivered to the customer. Learn to write your code so that you can debug sections of it as sections of code or as standalone methods. Rule 4: Write a set of routines that can be called from within the code that shows you the content of various memory locations on the LCD as the program runs. The first thing most programs must do is make the LCD come alive. Two questions have to be answered to confirm its proper operation:
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Is the software right Have you somehow destroyed the electronics
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Writing a Rudimentary Program for Testing the LCD
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A comprehensive program should be in your utility files to allow you to check the proper hardware and software operation of your LCD whenever you think it is necessary. Your program should check every character and every command in the LCD s vocabulary if you want to perform a really comprehensive check. You may even want to check every pixel. Integer math is the source of a lot of problems (for those who are unaware of the havoc that integer math calculations can visit upon the software being debugged). A certain amount of expertise with integer math is a must if you are going to create mathematical routines within your software. If the routine is amenable to it, you should write a program around the routine to test every possibility that the routine might encounter and thus debug it the hard way, even if it means your computer has to run the routine all night to get through all the commutations. Oftentimes all that is necessary is to run the routines that would be called at the boundary conditions or under critical conditions to make sure they are robust.
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Register underflows and overflows are a common problem. You have to make sure they do not occur. The system usually just crashes and does not provide any guidance as to what the problem might be when an underflow or overflow happens.
Another List of Simple Checks
Here are some simple checks you should apply if the Propeller still does not oscillate:
Check that the power is on to the project. Check that the USB plug is connected to the computer. Check that the USB plug is plugged into your board. Check that the Propeller is properly orientated for pin 1. Check that the program has proper code indentation (very important). Check that the addresses for all the devices for the project are correct. Check the spelling of all the code. Check that all sockets that should be empty are actually empty. Run a test program suited to and designed for your specific project. Check with an oscilloscope that the system is actually oscillating at the OSC pins. In most programs, some other pins should also be going high and low regularly. Recheck the wiring. Check for open wires and cold solder joints. Check for short circuits. Recheck the program. Run a program you know works on a Propeller you know works. Good luck helps, but there is nothing that beats having done your homework.
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