NMI DSP56F803 User Manual
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4 TROUBLE SHOOTINGThere are no user serviceable parts on the NMIN-0803-Mini. If connections are madecorrectly, operation should follow, or there are serious problems on the board. As always,the first thing to check in case of trouble is checking power and ground are present.Measuring these with a voltmeter can save hours of head scratching from overlooking theobvious. After power and ground, signal connections should be checked next. If the serialcable comes loose, on either end, using your PC to debug your program just won’t help.Also, if your terminal program has locked up, you can experience some very “quiet”results. Don’t overlook these sources of frustrating delays when looking for a problem.They are easy to check, and will make a monkey of you more times than not, if youignore them.One of the great advantages of having an interactive language embedded in a processor,is if communications can be established, then program tools can be built to testoperations. If the RS-232 channel is not in use in your application, or if it can beoptionally assigned to debugging, talking to the board through the language will providea wealth of debugging information.The LED’s can be wonderful windows to show operation. This takes some planning indesign of the program. A clever user will make good use of these little light. Even if theRS-232 channel is in use in your application and not available for debugging, don’toverlook the LED’s as a way to follow program execution looking for problems.The NMIN-0803-Mini is designed so no soldering to the board should be required, andthe practice of soldering to the board is not recommended. Instead, all signals are broughtto connectors.So, the best trouble shooting technique would be to unplug the NMIN-0803-Mini and tryto operate it separately with a known good serial cable on power supply.If the original connections have been tested to assure no out-of-range voltages arepresent, a second NMIN-0803-Mini can then be programmed and plugged into the circuitin question. But don’t be too anxious to take this step. If the first NMIN-0803-Minishould be burned out, you really want to be sure you know what caused it, beforesacrificing another one in the same circuit.Finally, for advanced users, the JTAG connection can give trace, single step and memoryexamination information with the use of special debugging hardware. This level of accessis beyond the expected average user of the NMIN-0803-Mini and will not be addressed inthis manual.NMIN-0803-Mini User Manual 15 |
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