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Reset the DS1820. Send 0CCh followed by 044h to begin the temperature sense and conversion. Wait 480 s for the temperature conversion to complete. Send another reset to the DS1820. Send 0CCh and 0BEh to read the temperature. Wait 100 s before reading the rst byte in the DS1820. Read the rst, or SP0, byte of the DS1820. Wait another 100 s before reading the second, or SP1, byte of the DS1820.

The DS1820 has a unique serial number burned into it. This allows multiple temperature sensors (and other devices using the Dallas Semiconductor one-wire protocol) to be placed on the same pulled-up bus. To avoid rst having to read the serial number out of the device and then referencing it each time a command is being sent to it, a 0CCh byte is sent rst. This indicates to the DS1820 that it is to send the temperature without checking for a valid serial number being sent. I found that for the DS1820 to work properly, I had to use the typical values for the data writes and not extremes in the speci cation. When I rst started working with the DS1820, I used the minimums (15 s for a 0) because I wanted to keep the time the microcontroller was running with interrupts masked to a minimum. When I did this, I found that there were problems with the DS1820 not recognizing correct data. After changing the timings to the typical values in the datasheets, the DS1820 seemed to respond properly, but instead of a single, long pulse for each bit returned, I received a valid mix of short and longer pulses.

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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.

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:

In the steady state, the velocity of flow in a pipe varies with pressure drop :

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