- What is an ISR - How would you debug an ISR - How do you check how long an ISR runs for A series of technical questions, some with an example code asking whats wrong, others just asking to solve. - Write a function to find if a number is even or odd - Now do it without modulo (Cause I used modulo the first time) - Write a function for a resource limited processor to find the square root rounded down of a number - You can only use basic math operations - What three things are wrong with the following ISR (I am estimating what it looked like, I don’t have a copy) double calculate_area(double radius) { double area = radius * radius * 3.14; printf("Area: %d", area); return area; }