During an interview for a firmware engineer's job, the interviewer may present you with a use case that requires you to resolve a problem or demonstrate how to program using certain values or tasks. They may ask you about a specific type of code used to execute a specific function. Most of these questions should be simple to answer due to your experience and knowledge. Some may be more obscure and address functions and code you don't commonly use. If you don't recognize the topic the interviewer is asking you about, admit this, and then describe how you would learn the code and include it in your firmware.