GlobalLogic Embedded Engineer Interview Questions and Answers

Q1. Basic c programming definitions
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Basic c programming coding questions

Q1. Asked for package
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Q1. He asked salary
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Very easy, basic questions

Written test
C programming

Q1. Types of error messages in CAN protocol
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Types of error messages in CAN protocol
• Bit Error: Error in a single bit of the message

• Stuff Error: Error in the stuffing bits

• CRC Error: Error in the cyclic redundancy check

• Form Error: Error in the message format

• Acknowledge Error: Error in the acknowledgement of the message
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Q2. Bit arbitration and its significance
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Bit arbitration is the process of resolving conflicts when multiple devices try to access the same bus simultaneously.
• Bit arbitration is important in multi-master systems where multiple devices can initiate data transfer.

• It ensures that only one device gains control of the bus at a time.

• Different arbitration schemes include priority-based, round-robin, and collision detection.

• For example, in a CAN bus system, the devic...read more
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Q3. Difference between normal can and extended can
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CAN is a communication protocol used in automotive and industrial applications. Normal CAN has 11-bit identifier while Extended CAN has 29-bit identifier.
• Normal CAN has 11-bit identifier while Extended CAN has 29-bit identifier.

• Extended CAN allows for more unique identifiers, enabling more devices to communicate on the same network.

• Normal CAN has a maximum data rate of 1 Mbps while Extended CAN has a maximum data rate ...read more
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Q4. Why can bus uses 120 ohm resistance
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120 ohm resistance is used in CAN bus to match the characteristic impedance of the transmission line.
• CAN bus is a differential signaling system that requires a balanced impedance to prevent signal reflections.

• The 120 ohm resistance matches the characteristic impedance of the transmission line, which is typically 120 ohms.

• Without the proper impedance matching, signal reflections can cause data errors and reduce the maxi...read more
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Q1. Explain diagnostic protocols
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Diagnostic protocols are a set of rules and procedures used to identify and troubleshoot problems in a system.
• Diagnostic protocols are used in various fields such as automotive, medical, and computer networking.

• They involve a series of tests and measurements to identify the root cause of a problem.

• Diagnostic protocols can be manual or automated, depending on the complexity of the system.

• Examples of diagnostic protocols...read more
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+ C and C++concepts.
+ RTOS
+ Multi threading

Q1. Questions in Embedded C, and about microcontrollers we have worked with
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Q1. Why are you interested in the field of embedded software development?
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I am fascinated by the challenge of working with low-level hardware and creating efficient, real-time systems.
• Enjoy the challenge of working with low-level hardware

• Excited about creating efficient, real-time systems

• Passionate about developing innovative solutions for embedded systems
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Q2. What is CAN protocol?
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CAN protocol stands for Controller Area Network protocol, used for communication between microcontrollers and devices in automotive and industrial applications.
• CAN protocol is a robust and reliable communication protocol used in automotive and industrial applications.

• It allows multiple microcontrollers to communicate with each other without a host computer.

• CAN protocol uses a differential signaling scheme to reduce ele...read more
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Q1. What is binary coded decimal?
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Binary Coded Decimal (BCD) is a way of representing decimal numbers using a binary code.
• BCD uses four bits to represent each decimal digit.

• Each decimal digit is represented by its binary equivalent.

• For example, the decimal number 25 is represented in BCD as 0010 0101.
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Q2. How keyboard mapping works in a microcontroller?
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Keyboard mapping in a microcontroller involves assigning specific key codes to each key on the keyboard.
• Keyboard mapping is typically done using a lookup table that maps physical key presses to corresponding key codes.

• The microcontroller reads the key code when a key is pressed and sends it to the computer for processing.

• Keyboards may use different mapping standards such as ASCII or HID.

• Custom keyboard mappings can als...read more
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Q3. What is the principle of analog to digital converter?
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An analog to digital converter converts continuous analog signals into discrete digital values.
• Converts continuous analog signals into digital values

• Utilizes sampling and quantization techniques

• Common types include successive approximation ADC and delta-sigma ADC
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Q1. What is embedded c
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Embedded C is a programming language used for developing software for embedded systems.
• Embedded C is a subset of the C programming language.

• It is optimized for resource-constrained systems with limited memory and processing power.

• It allows direct access to hardware and provides low-level control.

• Embedded C is used in various industries like automotive, aerospace, consumer electronics, etc.

• Example: Writing code to contr...read more
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Q2. Refer embedded c
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