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5. Make sure the wiring is what you think it is. Check the route of every wire. Mark if off
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on the schematic as you check it. Check the PC board trace routings where necessary.
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6. Check the values of each of the components on the board. 7. Make sure each IC is oriented with pin 1 in the proper location in its socket and that
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no pins are bent and thus not connected.
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8. Make sure power and ground to each IC are properly routed. 9. Measure voltages throughout the layout and confirm that they are what they are
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10. Make sure all capacitors are installed correctly. Check polarity where necessary. 11. Make sure all diodes are installed correctly. Not all always need to be installed so that
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the cathode is connected to ground. Confirm connections on all inductive loads.
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12. Make sure all inductive loads are properly protected against with diodes. Make sure
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these diodes are properly rated for amperage, voltage, and switching speed. Make sure none have been destroyed. 13. Use the oscilloscope to check for noise all over the circuitry. Eliminate it by adding small capacitors near the noisy areas. 14. Read the relevant section of the manual (the startup section) again. Make sure you understand what the manual is saying. Now make the following checks on the software side:
1. Go over the software, line by line, and make sure there are no typos. Not all typing
mistakes may be identified by the software.
2. Write a short LED blink routine and run that on the board to make sure the system
is actually alive and working. If the program loops as a part of its design, add a blinking instruction for one of the LEDs to tell you that the loop is actually executing as designed and not hanging up on some segment of code. 3. Go over the software to make sure there are no logical mistakes. 4. Follow the use of each variable throughout the program to make sure it does not get modified where it s not supposed to be modified. 5. Our software uses integer math. Make sure that none of the variables exceed the bounds that have been designated for their sizes. There are a number of ways to get input into and feedback out of from a malfunctioning program. Using as many as possible will reduce the number of times you have to reload the program. You have the following feedback devices available to you. Incorporate what you need into critical areas of the program.
signAL injeCtiOn teCHniqUes
LCD Use both lines on the LCD and use each character on each line. Speaker A speaker is easy to add. You can set up two tones that are easy to dif LEDs
ferentiate. Call them from various places in the program to see what is going on. If more is needed, add LEDs to the hardware so you can turn them on and off at critical junctures.
You can insert a short loop that displays the registers you are interested in at a critical location in the program. When the program enters this loop, it indicates that the program actually got this far and then it displays the registers of interest again and again without going any further. This loop can be moved up and down throughout the program so you can see what is going on and where. Here are the steps to follow:
1. Determine if the program is actually getting to a certain critical line of code. 2. Determine what the contents of various registers are at critical times in the code. 3. Look at how counters are behaving and confirm for yourself that this is exactly
what is supposed to be happening.
4. Look for areas where the program might be getting stuck in a loop. 5. Pay special attention to the operation of various cogs and how they interact with
variables specified by each other.
6. Go over the circuit layout to make sure there are no mistakes in the design of the
circuitry.
7. Go over the physical circuits to make sure they are actually wired the way they
were designed to be.
8. Make sure all lines that are to be pulled up or down are actually being pulled up or
down and that the resistors being used are of the right values.
Dumb Terminal Program
A dumb terminal program can be used to send all sorts of data to the monitor as your program runs. The more you have to look at, the more likely it is that you will spot the problem. A number of terminal programs are available at no charge on the Internet. I use the dumb terminal program provided by Microsoft as a part of its operating system utilities. The Bray Terminal program is a more sophisticated dumb terminal program that s available for free on the Internet.
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