Automotive electronics supplier

Questions asked

1. Write a C function that reads from a ring buffer filled by an interrupt handler, without losing or duplicating bytes.
2. What does the volatile keyword do in C, and when is it not enough?
3. A device in the field resets randomly about once a week. How do you debug it?

What to expect

Whiteboard C with a lot of attention to what happens if the interrupt fires between two specific lines. The reset question was open-ended — they wanted watchdogs, stack overflow, brown-outs and logging reset reasons to non-volatile memory, roughly in that order of suspicion.