Marelli Embedded Software Developer Interview Questions and Answers

The volatile keyword in programming is used to indicate that a variable's value can be changed unexpectedly.

• Used to prevent compiler optimizations that assume variable values do not change outside of the program

• Commonly used for variables that are modified by hardware or other threads

• Example: volatile int sensorValue; // variable updated by external sensor

Unions in C are used to store different data types in the same memory location.

• Unions are used to save memory by allowing different data types to share the same memory location.

• They are commonly used in situations where only one of the data types needs to be accessed at a time.

• For example, a union can be used to store an integer and a float, with only one being accessed depending on the context.

A 120-ohm resistor is used in the CAN protocol to match the characteristic impedance of the network and reduce signal reflections.

• The 120-ohm resistor helps to match the characteristic impedance of the CAN network, which is typically 120 ohms.

• It reduces signal reflections that can cause data corruption and communication errors.

• The resistor is placed at both ends of the CAN bus to ensure proper termination.

• Without the r...read more

PWM is a technique used to encode analog signal using digital pulses of varying widths.

• PWM is commonly used in controlling the speed of motors, brightness of LEDs, and audio signals.

• It works by varying the width of the pulse in a fixed time period, known as the duty cycle.

• The average voltage of the signal is determined by the duty cycle - higher duty cycle means higher average voltage.

• PWM is achieved by rapidly switchi...read more

My strengths include problem-solving, attention to detail, and strong programming skills. My hobbies include hiking, playing guitar, and reading.

• Strong problem-solving skills

• Attention to detail

• Proficient in programming languages like C, C++, and Python

• Hiking

• Playing guitar

• Reading