VAJRA IOT PRIVATE LIMITED Firmware Engineer Interview Questions and Answers

Q1. I2c, spi and uart
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Q2. Basic C questions
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Q1. Bare metal code for blinking an LED,
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Blinking an LED using bare metal code involves directly manipulating hardware registers without an operating system.
• Access the GPIO register for the specific pin connected to the LED

• Set the pin as an output

• Toggle the pin state at regular intervals to create the blinking effect
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Q2. Different types of pointers, volatile variable, storage classes, Static and extern keywords, ISR,
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Different types of pointers, volatile variable, storage classes, Static and extern keywords, ISR
• Pointers: Null pointer, void pointer, function pointer

• Volatile variable: Used to indicate that a variable may be changed by external factors

• Storage classes: auto, register, static, extern

• Static keyword: Used to declare variables that are only accessible within the same file

• Extern keyword: Used to declare variables that are d...read more
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Q1. Find nth largest number in a jumbled array
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Use sorting to find the nth largest number in a jumbled array.
• Sort the array in descending order.

• Access the nth element in the sorted array to find the nth largest number.
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Q2. Deeper questions on static, compilation
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Q1. Compilation process in c
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Compilation process in C involves preprocessing, compiling, assembling, and linking.
• Preprocessing: Includes header files, macro expansions, and conditional compilation.

• Compiling: Translates source code to assembly code specific to the target architecture.

• Assembling: Converts assembly code to machine code in object files.

• Linking: Combines object files and libraries to generate an executable file.
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Q2. Write a function pointer syntax?
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Function pointer syntax allows for storing the address of a function in a pointer variable.
• Syntax: return_type (*pointer_name)(parameters)

• Example: void (*funcPtr)(int) = &someFunction;
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Q3. Discussion on current project?
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Q4. Reverse the string?
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Reverse a given string
• Use a loop to iterate through the characters of the string

• Swap the characters from start to end of the string

• Continue swapping until reaching the middle of the string
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Q5. Set , clear and toggle the bit
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Q1. Mostly salary discussion
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Q2. Tell about yourself
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Q1. Volatile keyword
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Q2. Project specific
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Q1. Salary expectations
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Q2. Reason for job change
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Percentage, speed, series, logical abulity, differnces

Q1. C programs, protocols, Embedded C, pointers
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Q2. Strings swapping nibbles using c
Ans. 
Swapping nibbles of strings in C
• Use bitwise operations to swap the nibbles of each character in the string

• Iterate through each character in the string and swap the nibbles

• Ensure to handle edge cases like strings with odd length or non-hex characters
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Q3. I2c, can, spi, uart
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Q1. Normal hr questions
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Q2. Self, company details
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Very basic c questions like an array

Basics like converting decimal number to binary.

Q1. Role in the projects handled.
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Q1. Programing language
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Syllabus based question

Q1. Introduction, education
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