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Prerequisites
- Module 1: Setup
Debugging
More important than knowing how to make something work is knowing what to do when it doesn't. Debugging is probably one of the most important skills you can learn, since things rarely work perfectly the first time.
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Hopefully, you were able to see how GDB allows you to observe the state and data of your program without recompiling or relying on debug output. If you are more of a visual learner, CS246 has an amazing GDB tutorial video on their Youtube page that goes over these commands and some other helpful ones. Although they use C++, many of the same principles still apply to C.
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There's actually another issue in this code. The expected behavior is for all LEDs to toggle in sequence, but the values are all wrong. Can you figure out why? Hint: Be careful with addresses to stack-allocated variables! |
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