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Embedded Systems Interview Questions

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Need to practice your Embedded Systems and Embedded Software Engineering skills for an upcoming job interview? Try solving these Embedded Systems interview questions that test knowledge of hardware used in embedded devices, network protocols, and software used in embedded applications. We’ll provide feedback on your answers, and you can use a hint if you get stuck.

These Embedded Systems interview questions are examples of real tasks used by employers to screen job candidates such as embedded software/systems engineers, and others that need to know how to design, develop, test, and maintain embedded systems.

1. Bluetooth

Wireless connection
   
Easy 

A car company plans to extend its car computer system to offer Bluetooth connectivity with the owner's mobile phone.

Select all correct statements about the properties of such a connection.

(Select all acceptable answers.)

In most cases, a Bluetooth connection consumes less power than a WiFi connection.
A Bluetooth connection on a modern mobile phone will offer data transfer speeds that are as fast as data transfer speeds on a modern USB.
Bluetooth devices need to have line of sight with each other in order to connect.
A Bluetooth connection usually offers better maximum range than a WiFi connection.
A Bluetooth connection can be used to transfer data between a car and a mobile phone.
   


2. Packet Distribution

Critical section Mutex Semaphore
   
Easy 

The following part of the C code distributes packets from the input track to the output track:

void* take_and_put(void *arg)
{
    sem_wait(&semaphore);
    take();
    sem_post(&semaphore);

    pthread_mutex_lock(&mutex);
    put();
    pthread_mutex_unlock(&mutex);

    return NULL;
}

Where semaphore and mutex are initialized with:

// int sem_init(sem_t *sem, int pshared, unsigned int value);
sem_init(&semaphore, 0, 3);
// int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr);
pthread_mutex_init(&mutex, NULL);

If the function take_and_put is repeatedly called by a large number of threads, select correct statements about the take_and_put function.

(Select all acceptable answers.)

A thread started with the function take_and_put can call the function take even if another thread is already inside the take part of take_and_put.
A thread started with the function take_and_put can call the function put even if another thread is already inside the put part of take_and_put.
If one thread blocks at take indefinitely, other threads will still be able to start and finish take_and_put.
If one thread blocks at put indefinitely, other threads will still be able to start and finish take_and_put.
If the function take locks mutex at its start and unlocks mutex on its end, the code will eventually end in a deadlock.
   


3. Digital Circuit

Boolean function Logic gates
   
Easy 

You have a component which should be used as part of a signal processing device. It has four input pins, one output pin, and three slots where you can insert logical gates:

The component should have the following truth table:

In Out
A B C D E
0 0 0 0 0
0 0 0 1 0
0 0 1 0 0
0 0 1 1 0
0 1 0 0 0
0 1 0 1 1
0 1 1 0 1
0 1 1 1 0
1 0 0 0 0
1 0 0 1 1
1 0 1 0 1
1 0 1 1 0
1 1 0 0 0
1 1 0 1 0
1 1 1 0 0
1 1 1 1 0

 

Choose appropriate logic gates for the component's slots to achieve the required truth table.

1st slot: gate

2nd slot: gate

3rd slot: gate

   


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