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Using the RTOS and making sure that most operations are keyed off of the timer rather than instruction delays means that this application should be transferred easily to another microcontroller and RTOS combination. The only issue that you would nd in porting this RTOS application to another microcontroller is with the DS1820 code and how it is timed in the application. In The TAB Electronics Microcontroller Handbook, I implemented this application on a variety of microcontrollers, including a Motorola 68HC05 in an RTOS that I had written for it, and in Programming and Customizing the 8051 Microcontroller, I did the same thing with an 8051-derivative microcontroller. This application is quite a bit easier to implement with an RTOS because it avoids the need for controlling access to the LCD, which must be considered if the timer interrupt occurs while the LCD was being updated with the temperature.
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Ef ciently characterizing problems and then hypothesizing on the cause of the problem and investigating different methods of xing the problem with implementation, testing, and documentation of the repair action are the process that I will present to you in this chapter. Fixing problems is generally referred to as debugging, but I personally dislike this term, and at work, I discourage its use. The term comes from the story of some technicians sent in to x one of the massive computers of more than 50 years ago who discovered a y in the works that was preventing the computer from working properly. The simple act of removing the y to restore the computer to operation quickly became known as debugging. When hearing the term and the story, a person is left with the impression that debugging is a quick and painless operation. Unfortunately, this is rarely the case, and frequently when somebody goes for the quick x of a problem, he or she either ends up spending a lot more time than if he or she had followed a structured process or introduces new problems ( bugs ) into the system. I prefer the term failure analysis. It s interesting to see how exchanging a simple colloquial term for a ten-dollar phrase can change the perception of the process of xing a problem in a computer system from being a quick and dirty exercise into a structured process that implies that the people working on the problem understand the characteristics of the failure, its root cause, and the most ef cient method of eliminating it. In the rst edition of this book I rather facetiously suggested that to debug your application, you should follow a three-step process:
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To be fair, after making this declaration, I did present some information on how to develop stimulus les successfully and what to look for; but I think the information was pretty sketchy, and I think that I could have done better explaining how to nd and x application problems.
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You will nd that following the steps and procedures I layout for you in this chapter will allow you to x problems faster than if you just look for the rst problem and try to nail it. This will seem like a paradox because I will be pushing for you to characterize and understand exactly what is happening and what the symptoms are telling you. With this information and hypothesizing on what the defect is, you will nd that you will understand exactly what is happening and why your x should eliminate the problem. Thus, instead of blindly going ahead and simulating the application in a three-step process, I will present to you the following failure analysis process to understand, nd, correct, and release xes to problems in your application:
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Document the expected state. Characterize the problem. Hypothesize about what the cause of the problem is. Propose corrective actions. Test different xes. Release the corrective action.
This process is not limited to PIC software or hardware. It works very well for all problems that you may encounter in your everyday life. A few years ago a coworker and I had similar problems with our 50-year-old houses when rain hit the side of our houses, our basements would start to ood. My coworker has spent $30,000 on the problem so far and still has problems, whereas I followed the process outlined in this chapter and spent less than $1,500 right at the beginning to x the problem and haven t had a problem since.
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