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program C-1
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Starting and Stopping Cogs (Sample Code) (continued)
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PUB SecondLed | counter 'Cog for second led on line t counter~ 'set low = 0 dira[5]~~ 'sets direction of line 4 repeat 'loop !outa[5] 'Toggle line 5 waitcnt(clkfreq/10 + cnt) 'wait for a 1/10 of second counter++ 'increment counter if counter == 25 'if counter is 25 Cogstop(0) 'Cog 0 stopped elseif counter == 50 'test for 50 Coginit(0, ThirdLed, @stack[15]) 'starts up cog 0 again ' PUB ThirdLed | counter 'Cog for third led dira[6]~~ 'makes line an output repeat 'loop !outa[6] 'toggles line waitcnt(clkfreq/23 + cnt) 'wait for a 1/23 of second
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If you need a more robust platform or if you do not want to invest in the Education Kit (although I strongly recommend that you do), you can design a board that follows the circuitry shown in Figure D-1 and modify it to suit you needs. The circuit does not show the power supply wiring. Both populated and unpopulated single boards can be purchased from Encodergeek.com. You can populate the board over a period of time, as your expertise demands, to add the functionality you need. This approach will help you keep your initial costs down.
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figure d-1 Wiring schematic for experimental board. (specifications are liable to change without notice.)
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figure d-2 populated experimenter s board. (prototype shown. specifications are liable to change without notice.)
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Figure D-2 shows the prototype. Improvements have been made in the production models. An unpopulated board (available from Encodergeek.com) can be populated as you need more features to keep your initial costs down.
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debUgging
Debugging and Troubleshooting
Debugging is not a random process during which one might hope to get lucky. It is a very carefully thought-out strategy to find why a program is not behaving the way it was intended to and what needs to be done to correct the problem. You will have fixed the problem only if you can make the problem come back by undoing the fix. A vague superstition that you might have fixed the problem by pressing on a warm resistor is not enough to decide that the problem has been fixed. You must be able to make the problem come back. This is exactly the reason why intermittent problems are so hard to fix. Its hard to make them come and go on command and so it is hard to understand the problem.
first problem that Must be fixed The microcontroller circuitry must oscil-
late.
The clock frequency specification is important and must be specified accurately. The clock frequency specification for the Propeller is a little more complicated than it is for the average microprocessor. If you do not specify anything, it defaults to an internal frequency determined by a resistor capacitor pair inside the Propeller. No external components need to be attached to the Propeller in this case. The frequency will be approximately 4 MHz because the resister capacitor values in a mass-produced chip cannot be guaranteed to be exact. If you are using a crystal across pins 25 and 26, you must specify the frequency exactly as suggested in the Propeller manual. The oscillations can be checked with an oscilloscope. You should see a very clean sine wave (not square, if you are using a slower oscilloscope). Once you are satisfied you have proper oscillation, we can move to the other components.
debUgging
Start off with the following checks on the hardware side:
1. Make sure the microcontroller has the correct power. 2. Make sure the power is 3.3 volts on the money. 3. Make sure you have clean DC power with no noise. 4. Use a magnifying glass to check the PC board for shorts and dry solder joints. Go
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