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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Multiple choice questions of embedded concepts

Basic c programming questions

Given some questions and we can prefer the language

Q1. Have you worked on linux
Ans. 
Yes, I have worked on Linux for embedded software development.
• I have experience developing embedded software using Linux as the operating system.

• I have worked on customizing Linux kernels for specific embedded systems.

• I have used Linux tools and libraries for developing embedded applications.

• I have debugged and optimized software performance on Linux-based embedded systems.
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Q2. What is micro controller?
Ans. 
A microcontroller is a small computer on a single integrated circuit that contains a processor core, memory, and programmable input/output peripherals.
• Microcontrollers are used in embedded systems for controlling various devices and processes.

• They are commonly found in everyday devices such as microwave ovens, washing machines, and remote controls.

• Microcontrollers are programmed using specialized software tools and lan...read more
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Q1. Self introduction
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Q2. Are you ready to relocate
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Embedded c 15 question and c language programming

Q1. Basically focaus on c laguage
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Basic c datastructucture networking l2 l3 questions

Q1. Question on projects.
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Q2. How packet goes from source to destination.
Ans. 
Packets are sent from source to destination through a series of network devices using routing protocols.
• Packet is created at the source with source and destination IP addresses.

• Packet is sent to the default gateway or router.

• Router checks its routing table to determine the next hop for the packet.

• Packet is forwarded to the next hop until it reaches the destination.

• Destination receives the packet and sends an acknowledg
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Q3. Delete a node from single linked list.
Ans. 
To delete a node from a single linked list, we need to find the node and update the pointers.
• Traverse the list to find the node to be deleted

• Update the previous node's pointer to point to the next node

• Free the memory of the node to be deleted
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Q4. Dynamic memory alocation in c
Ans. 
Dynamic memory allocation in C allows allocation of memory at runtime.
• Dynamic memory allocation is done using functions like malloc(), calloc(), realloc() and free().

• malloc() allocates memory block of specified size and returns a pointer to the first byte of allocated memory.

• calloc() allocates memory block of specified size and initializes all bits to zero.

• realloc() changes the size of previously allocated memory block...read more
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Q5. Interprocess communication in OS
Ans. 
Interprocess communication is a mechanism that allows processes to communicate with each other in an OS.
• IPC mechanisms include pipes, sockets, message queues, shared memory, and signals.

• IPC can be used for synchronization, data sharing, and coordination between processes.

• IPC can be implemented using system calls such as fork(), pipe(), socket(), and msgget().
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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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