L&T Technology Services Embedded Software Developer Interview Questions and Answers

UART protocol, Data structure

Function pointers , Communication protocols

Q1. What are storage class
Ans. 
Storage classes in C specify the scope and lifetime of variables.
• Storage classes include auto, register, static, and extern.

• Auto variables are local to a block and have automatic storage duration.

• Register variables are stored in CPU registers for faster access.

• Static variables retain their value between function calls.

• Extern variables are declared in one file and can be used in another file.
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Q2. Explain structure program
Ans. 
A structure program is a program that uses structures to group related data together.
• Structures in C programming allow you to group related data together under one name.

• You can define a structure using the 'struct' keyword.

• Structures can contain different data types, including int, float, char, and even other structures.

• You can access the members of a structure using the dot operator.

• Example: struct employee { int id; ...read more
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Q1. Mainly focused on basics of c language Stack program
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Q2. Compilation stages , function
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Q1. They generally asked about basic C question in pointers,function pointers,callback function
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Q2. Write a program on finding little or big endian,no of bits set in bit magic,
Ans. 
Program to find endianness and number of bits set in bit magic.
• Use bitwise operators to check endianness

• Count number of set bits using bitwise AND and right shift

• Use pre-defined functions for endianness in some programming languages

• Endianness can affect network communication and file formats
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Q3. Basic of rtos diff btw rtos and gpos core optimisation techniques used debug technique when fault occurs
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Q4. Basic IPC concepts used in operating system
Ans. 
IPC stands for Inter-Process Communication and is used for communication between processes in an operating system.
• Shared memory

• Message passing

• Pipes

• Sockets

• Remote Procedure Calls (RPC)

• Semaphores

• Mutexes
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After applying for drive through On Campus.From Hirepro Platform The mail was Triggered and in exam they conduct both Aptitude and Technical question from Embedded Systems,C,About 8051,8086 microcontrollers.After The next section Coding test Have Two Coding question Based Arrays Medium Level You Can do Coding In C or C++ or Phyton

Q1. At first Interviewer as asked me to Introduce my self and after he has asked My favourite subjects
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Q2. 1) which microcontroller you have used in Academics?
Ans. 
I have used STM32 microcontroller in my academics.
• I have worked on STM32F4 Discovery board for a project in my final year.

• I have also used STM32CubeMX software for code generation and debugging.

• I have experience in programming STM32 microcontrollers using C language.
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Q3. 2) About Linux Boot and How to Interface Raspberry pi
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Q4. 3) About Interrupt service Routine
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Q5. 4) About Real Operating Systems
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Q6. 5) About Deadlock, Priority Inversion
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Q7. 6) About Mutex and Semaphore
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Q8. 7) To write program for Toggle particular But in C?
Ans. 
To toggle a particular bit in C, use bitwise XOR operator with 1 at the desired bit position.
• Use bitwise XOR operator (^) with 1 at the desired bit position to toggle it.

• Example: To toggle the 3rd bit of a variable 'x', use x ^= (1 << 2);

• Make sure to use the correct bit position starting from 0 for the least significant bit.
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Q9. 8) To write program to iterate an array using pointer
Ans. 
Program to iterate an array using pointer
• Declare a pointer variable and initialize it to the base address of the array

• Use a loop to iterate through the array using the pointer variable

• Increment the pointer variable in each iteration to point to the next element

• Stop the loop when the pointer variable reaches the end of the array
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Q10. 9) Then about my projects
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Embedded c 15 question and c language programming

Q1. Basically focaus on c laguage
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