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When you re looking at various points on the circuit with an oscilloscope, mostly what you see are lines that are high or low. Most of the time that is not enough to recognize
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the presence or absence of a signal being traced. This can easily be remedied by creating a signal that provides a square wave that can be injected into the system. Looking at the original signal with the oscilloscope will tell you what to look for at various follow-up locations on the circuit board. Program E-1 provides a code segment that can be used in a spare cog to create a signal on pin P25.
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CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 blink_pin =25 '''' PUB Go Cognew(cog_UpDn, @stack) Repeat
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'The system clock spec ' ' 'main cog 'start new cog for osc 'parking loop
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PRI wait 'delay method waitCnt((clkfreq/12_000)*waitPeriod + cnt) PRI Cog_UpDn dira[blink_pin]~~ repeat wait !outa[blink_pin] 'osc cog 'make pin output loop 'wait for time 'invert line
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Although we are using a system of solderless breadboards in our setup, the use of solderless boards for your prototyping activities is in general not recommended. They are alright for small experimental excursions when you first start out with the Propeller, but as your circuitry gets more and more sophisticated and complicated, there is too great a probability of poor connections and wires coming loose to use these devices. It is recommended that you use the perforated boards that have a separate solder pad for each hole and then solder the wire wrap socket for each component into the board. Next, connect each of the components with wire wrap technology with straightforward point-to-point connections. The key is to be very careful and thorough so that there are no mistakes. It takes patience and care. Take your time and check your work before and after each connection is made. Mark it off on your circuit diagram one line at a time. I also use circuit boards with continuous bars of conductors on them for some of my projects.
debUgging At tHe MOre prACtiCAL LeveL
Debugging at the More Practical Level
Now what do I do I ve tried everything. The project is deader than a door nail and I don t have a clue! A fairly long program you wrote will not work the way it is supposed to. You don t know if it is the software or the hardware, and you don t have a clue as to what you should do. Don t throw it all in the garbage just yet. Chances are that with a little bit of work, everything will work just as you intended. After all, you did create all the hardware and all the code, and hopefully no one knows more about it than you do! The problem is that there is nothing to look at or to see: The thing is dead, and you don t know where to start. The solution is to make things visible and to start the process in a step-by-step manner so that you can make sure each step in the program you have created is doing what it is supposed to do. The good news is that you do not have to spend a fortune on new software and hardware, and you don t have to spend a year of your life learning a new discipline. You already know and have everything you need to debug the program in your Propeller. The two output devices on the education board can be used as aids in the debugging process. These devices are:
The LCD The LEDs placed on the board by you
Also, a number of input devices can aid in the debugging process by making the debugging process more interactive. These devices include:
Potentiometers Buttons
We also have some of the standard software tools we can use, including the following:
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