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Jon Titus
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Re: Part IV: Fundamentals of Digital Debugging
Jon Titus   1/19/2012 3:55:26 PM
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Q:  @Jon: Do you follow a specific sequence when debugging a MCU design _not_ made by yourself?

 

A:  I check power first.  Many times the power supply is the weakest part of a design--a cheaply built import.  Then check the power to the circuit.  If those are OK, what does the problem seem to be?  I look for external problems such as damaged connectors, burned or extra-hot components, solder bits between contacts, nicks in narrow PCB traces, loose screw shorting contacts--generally the obvious visual things.  Then I want to look at operation of external circuits such as serial port, parallel port, USB signals, etc. to get an idea of what works and what doesn't.  Only then do I look at the code.  That assumes I have the code to work with!



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