C test: 2 set of functions to implement in C within 1.5 hrs. Not very difficult if you are a regular hands-on programmer Interview questions: low level firmware steps to implement data acquisition using 8 channel ADC. How ADC works? How to implement firmware update scheme? How to differentiate valid binary image and malicious one (hint: use signature authentication)? Some irrelevant questions like: how will you implement sudoku in C, logic to implement VI editor How will you recover if a process is crashed while holding a mutex and another process is waiting on it (this is very specific to OS and linux solves this using concept of "robust mutex") what are some of the challenging problems you have solved, explain projects