Embedded Hardware Engineer Technical Questions Interview At Joshua Greene Blog


So, there is a huge scope for professionals in the job market. We at Tekslate, have prepared a bunch of top interview questions in this blog that covers the basics of the embedded systems. We hope you will benefit from these questions and clear your interview easily.

embedded systems interview questions

But before investing tens of hours preparing for an interview at Google, you should take some time to make sure it’s actually the right company for you. Please reply here….for the above questions..any help is highly appreciated….. When there is no more data to be transmitted, the master stops toggling its clock. SPI or CSI is a simple master/slave communication protocol. If you need to go far at high speed, you can use an active current source instead of a simple pull-up resistor. Using a charge pump also reduces “ghost signals” caused by reflections at the end of the bus lines.

Embedded Systems Latest Interview Questions Answers

The compiler understands the statement expression a–b by taking off as much operators as it makes sense to a variable. This question is designed to determine what a candidate understands about the inner workings of an embedded system. We have compiled a set of questions with the help of 70+ hiring managers at different organizations.

It is dedicated to its specific task and performs only one task at one time. TekSlate is the best online training provider in delivering world-class IT skills to individuals and corporates from all parts of the globe. We are proven experts in accumulating every need of embedded system meaning an IT skills upgrade aspirant and have delivered excellent services. We aim to bring you all the essentials to learn and master new technologies in the market with our articles, blogs, and videos. Build your career success with us, enhancing most in-demand skills .

The forward reference refers to the case when we point an address space of a smaller data type with a pointer of a bigger data type. This can be pictured as allocating memory in single bytes and accessing it with integer pointer as chunks of 4. I was involved few times in the interviews of students applying for an internship. In my department we’re doing only embedded software/firmware, not hardware, however we’re in close contact with hardware guys to align interfaces. The interview process can be a horrible experience for the interviewee.

Every slave on the bus that hasn’t been activated using its slave select line must disregard the input clock and MOSI signals, and must not drive MISO. The master then pulls the slave select low for the desired chip. If a waiting period is required (such as for analog-to-digital conversion) then the master must wait for at least that period of time before starting to issue clock cycles. To begin a communication, the master first configures the clock, using a frequency less than or equal to the maximum frequency the slave device supports. Clock-based framingIn a clock-based system, a series of repetitive pulses are used to maintain a constant bit rate and keep the digital bits aligned in the data stream.

Note that we have separate guides for Google engineering managers, data engineers, and machine learning software engineers, so take a look at those articles if they are more relevant to you. Transmissions often consist of 8-bit words, and a master can initiate multiple such transmissions if it wishes/needs. However, other word sizes are also common, such as 16-bit words for touchscreen controllers or audio codecs, like the TSC2101 from Texas Instruments; or 12-bit words for many digital-to-analog or analog-to-digital converters. A variable declared static within a module, is accessible by all functions within that module. It is not accessible by functions within any other module.

For example, if you have to allocate an array of 100 integers and there is no contiguous block of memory with that space, this causes a runtime error. This is why we don’t use dynamic memory allocation in embedded systems firmware in the first place. It is an extension of C programming language that is used to develop micro-controller based applications.

  • After doing this, I usually continue the interview with tech questions based on the experience previously discussed.
  • So, if you have to change the program, then you must have to change the hardware.
  • In electronic systems and computing, the firmware is a computer program that provides low-level control for the device’s specific hardware.
  • Interviewers may ask you this question because they generally don’t understand these differences or want to see how you perceive them.
  • Where possible, it is best to avoid using char and short as local variables.
  • This is how we can use a variable in a source file defined in another source file.

Static variables can only be accessed in the files were they are declared. Micro-controllers have I/O, Memory etc. built into it and specially designed for Control applications. Mutex is also a tool that is used to provide deadlock free mutual exclusion. It protects access to every critical data item, if the data is locked and is in use,it either waits for the thread to finish or awakened to release the lock from its inactive state. It is a timing device which is set to predefined time interval and some task is to be performed at that time. It is used to reset original state when an inappropriate event take place.It is usually operated by counter device.

For instance, “Role-related knowledge and experience” could be broken down into “Security architecture” or “Incident response” for a site reliability engineer role. But the total number of attributes does not usually exceed six or seven. You’ll share a Google Doc with your interviewer, write your solution directly in the document and won’t have access to syntax highlighting or auto-completion like you would in a regular IDE. It’s therefore a good idea to practice writing code in Google Docs before your interview. If you’re applying for a new graduate or intern position your process will often start with a coding sample test to take online. The coding sample includes two questions that you have to complete in less than 90 minutes in total.

Offbeat, Unusual, Unconventional & Interesting Career Interviews

DSC is 16 bit RISC machine that combines control advantages of micro-controllerand digital signal processing to produce tightly coupled single chip-single instruction stream solution for embedded system design. An in-depth understanding of digital signal processing is required for audio processing. Though Digital Signal Processing is a subject which is part of the Electronics Engineering curriculum, I have gained deeper knowledge through my work experience. In my experience the actual hands-on work you do and the peers in your team teach you more than any book/course does. After completing my post-graduation, I could not immediately get back to my career in Embedded systems and was managing operations of my family run business for two years.

embedded systems interview questions

Of accessing the General Purpose Input Output registers. A) Accessing the memory-mapped peripherals register hardware status register. A) Volatile is used to prevent the compiler to optimize any variable. The 8051 microcontroller has a maximum oscillator frequency of 12 MHz, and peak performance is 1 MIP. The Null pointer is a pointer that does not point to any valid location. The NULL pointer is defined when we want to ensure that the pointer does not point to any valid location and not to use that pointer to change anything.

Super loop is an infinite loop which is suitable only in embedded c programming because there you have to run your code for a long time and wants explicitly terminate when the behavior is changed for your system. Static variables have the property of preserving their value even after they are out of their scope. Its scope is local, but it lives until the end of the program. The compiler persists with the variable till the end of the program. We can define static variables inside or outside the function. The static variables are alive till the execution of the program.

To get the hardware to do something, the CPU basically executes a kind of write operation. To run Java on any platform you will need a Java Virtual Machine . I would not hold out too much hope for PIC16 due to the memory resources required and perhaps the performance. If you want the highest performance and smallest footprint then C or C++ is a better solution for embedded systems. The main difference between Software and Firmware is, the software is virtual so it can be Copied, Changed, and Destroyed.

We define a pointer to be null when we want to make sure that the pointer does not point to any valid location and not to use that pointer to change anything. If we don’t use null pointer, then we can’t verify whether this pointer points to any valid location or not. Do you have questions of your own that you either you used in recruiting — or that were used on you?

Interview Process And Timeline

The goal of this exercise is to add two integers of two linked lists. We’ve created a coaching service where you can practice 1-on-1 with ex-interviewers from leading tech companies like Google.Learn more and start scheduling sessions today. One of https://globalcloudteam.com/ the main challenges of coding interviews is that you have to communicate what you are doing as you are doing it. To get used to this kind of “thinking out loud” we strongly recommend practicing live coding interviews with a peer interviewing you.

embedded systems interview questions

In case of interactive systems display of menu list and reading in the choices of user’s could be encapsulated as a single unit. F) ISR tells the processor or controller what to do when the interrupt occurs. Every Instruction of the Microcontroller has its unique number called an opcode. Request and the first instruction of the interrupt handler.

The goal of this exercise is to merge two sorted linked lists. If one of the linked lists ends sooner, we’ll continue with the other linked list. Once both of the linked lists are done and no carry is left to be added, the algorithm will terminate. At each iteration, we add the current digits of the two lists and insert a new node with the resulting digit at the tail of the result linked list. As mentioned previously, if you’re a junior developer the expectations will be lower for you than if you’re mid-level or senior.


• Put related arguments in a structure, and pass a pointer to the structure to functions. • Try to ensure that small functions take four or fewer arguments. Yes it can be, it means that, it can be changes by hardware state change, but its read only register in hardware, so code should not try to modify it.

What Are The Main Advantages Of Embedded C?

Here are the most common system design questions asked in the Google interview reports which can be found on Glassdoor. For more information, we recommend reading thisguideand practicing system design questions using our list of 31 questions. This is the part of the interview where you want to show that you can both be creative and structured at the same time. In most cases, your interviewer will adapt the question to your background. For instance, if you’ve worked on an API product they’ll ask you to design an API. But that won’t always be the case so you should be ready to design any type of product or system at a high level.

Behavioral Questions

So I was determined to work in the Embedded system domain again. I made a list of companies I aimed to work for and applied for positions in those organizations and also requested peers in my network to help. It was through employee referral I landed up in my current job role. During my final year of graduation, irrespective of their specialization, every student was being offered jobs by software firms. I also had an offer from a software firm through my campus placement, but I wanted to pursue a career in my core field.

What Is Endianness Of A System And How Do Different Systems Communicate With Each Other?

But to see the output we need certain output devices like LED, Buzzer can be connected to check its functionality. Without the help of any o/p device connected we can check the functionality of Microcontroller. That is why when writing the device drivers, the physical address of the data buffer has to be assigned to the DMA. The additional skills required are analytical skills, programming skills and ability to adapt to newer hardware platforms.

While you can’t be familiar with all the functions and lines of code used in firmware, you should be familiar with the most common ones and be able to describe them. If you are asked about something you are unfamiliar with, state that, then describe to the interviewer how you would research it. This is a general or opening question which the interviewer will ask to begin the conversation, learn more about you, and uncover information that they can use throughout the interview. This provides a great opportunity to direct the conversation toward subject areas that you are familiar with and can easily discuss.

Reading the value from memory is the only way to check the unpredictable change of the value. To get hands-on practice with 100+ real product features, check out Educative’s interview prep series Decode the Coding Interview. Our team of experts has combed through the top interview questions and incorporated them into a carefully crafted set of scenarios for you to learn from.

SONET is a synchronous system in which all the clocks in the network are synchronized back to a master clock reference. SONET frames are then positioned within the clocked stream. Byte-oriented framingComputer data is normally stored as alphanumeric characters that are encoded with a combination of 8 bits . This type of framing differentiates one byte from another.

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