Debugger:
"In the embedded world, sometimes you can't even be a puts/printf debuggerer. There have been some situations, typically early in development, where I've had to be a "turn the LED on or turn it off" debuggerer. Amazingly, that binary output is usually enough to fix whatever problem is happening and bootstrap into printf debugging or full ICE interactive debugging."
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"One time I couldn't get to an LED so I used an IR thermometer pointed at chip to debug it.
Telling the difference between hot and cold and whether it was getting warmer or colder told me what I needed to know."
:V :V :V