Embedded C is an increasingly common choice for building software for embedded systems, which are purpose-built computers that perform a narrow set of tasks. Knowing the most popular interview questions for an embedded C programming role will significantly improve your chances of getting the job. The following are some of the more often asked Embedded C Questions during an interview.
How do Embedded systems differ from General-purpose computers?
This is a fundamental concern you might be asked in an embedded C job interview. In contrast to a general-purpose computer, which may be used for various activities, an embedded system is built to execute a single, precise function. Most consumer gadgets, automobiles, medical devices, and industrial control systems use embedded systems, which are often compact and make do with less material.
How are Microprocessors and Microcontrollers different?
In an embedded C interview, this is another common question. You are expected to be able to differentiate between microprocessors and microcontrollers. A microprocessor is a small but powerful computer chip that can handle data processing and control tasks. Memory and other internal and external devices are requirements for its operation. Conversely, microcontrollers are integrated circuits containing all the necessary components, including the central processing unit, memory, and any additional devices on a single chip. Its typical application is in embedded systems, where power and size constraints are essential.
What are C’s Fundamental data types?
To succeed as an embedded C programmer, you must know your way around the language’s most fundamental data types. The most common data types are integers, floating point numbers, character strings, doubles, and voids. You should be able to discuss their sizes, ranges, and programming applications. For instance, int represents integers, float represents floating-point numbers, char represents characters, double represents double-precision floating-point numbers, and void represents an empty data type.
What Embedded system memories are available?
The memories in an embedded system can range from ROM, Read-Only Memory to RAM, Random Access Memory to EEPROM, and Electrically Erasable Programmable Read-Only Memory to Flash Memory. Each form of memory has its benefits and drawbacks, and you should be able to describe those and how embedded systems typically use them.
How do interruptions operate in Embedded systems?
A program’s usual execution flow may be disrupted by interrupts, which can be generated by either external events or internal conditions in an embedded system. In an embedded system, you should be able to describe what interrupts are, how they are prioritized, and what happens when an interrupt occurs. In addition, you need to understand the concepts of interrupt service routine, interrupt vector, and interrupt latency.
What is a Pointer, and how does it function in C?
Pointers are a fundamental element in C programming. In computer science, a pointer is a special kind of variable that records the location in memory of another variable. Memory management is crucial in embedded systems, and this feature enables direct manipulation of memory. You should know how to define, initialize, and use pointers, as well as how to perform pointer arithmetic, as well as how to pass pointers to functions and structures.
It is essential to remember that the precise questions you may be asked in an interview might vary widely based on the interviewer’s preferences, the organization, and the role you are applying for. It would help if you always prepared for an interview by reading the job description and requirements and practicing answering possible interview questions.