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copied!<p>It depends on the type of debugging that you're trying to do - in particular if you're after a temporary method of tracing or if you are trying to provide a tool that can be used as an indication of status during the life of the project (or product).</p> <p>For one off, in depth source tracing and debugging an in-circuit debugger (eg. jtag) can be very helpful. However, they are most helpful where your debugging requires setting breakpoints and investigating memory and registers - which makes it of little benefit where you are dealing time critical problems.</p> <p>Where you need to determine program state without having a significant impact on the execution of your system the use of LEDs connected to spare I/O pins will be helpful. These can also be used as the input to a digital storage oscilloscope (DSO) or logic analyzer. This technique can be made more powerful by selecting unique patterns of pulses that will be identifiable on the DSO.</p> <p>For a more versatile debugging tool, though, a serial port is a good solution. To save cost and PCB real-estate you may find it useful to use an plug-in module that contains the RS232 converters.</p> <p>If you are trying to provide a longer term indication of status as part of the normal operation of your product, LEDs are again a cheap an simple method. However in this situation it is best to choose patterns of pulses that are slow enough to be easily identified by visual inspection. This will all you over time you will learn a particular pattern that represents "normal" behavior.</p>

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