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Since the position is for new grad, the questions were about projects or thesis. Also, some basic knowledge about the position, like real-time system, which can be found in the qualifications. At last, there were some questions such as, what are the differences between study at university and in company; and why should we hire you.
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Embedded Software Engineer - New Grad

Interviewed at Ciena

4.1★
Apr 9, 2015

Since the position is for new grad, the questions were about projects or thesis. Also, some basic knowledge about the position, like real-time system, which can be found in the qualifications. At last, there were some questions such as, what are the differences between study at university and in company; and why should we hire you.

You are outside a room with 3 lightbulbs, that are turned on, labeled 1,2,3. Outside the room there are 3 buttons that correspond to the lightbulbs inside. You can press the switches in any order without looking inside to turn light bulbs off. You can then go inside the room to determine which light corresponds to each light. How can you determine which light corresponds to what switch?
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Embedded Systems Engineer

Interviewed at Calix

4.5★
Oct 10, 2017

You are outside a room with 3 lightbulbs, that are turned on, labeled 1,2,3. Outside the room there are 3 buttons that correspond to the lightbulbs inside. You can press the switches in any order without looking inside to turn light bulbs off. You can then go inside the room to determine which light corresponds to each light. How can you determine which light corresponds to what switch?

Qualcomm (Linux Team): 1st Round: 1) You are given two 32-bit numbers M and N, and two bit positions I and j. Write a function to insert M into N at I and assume that the space j-I can compass all the required bits of M 2) You are given a function read(int blockNo, void *buf) - returns a 512 byte block. read_offset_size(int offset, int size, void *buf) - implement this function using the above prototype 2nd round: DMA, Semaphore & mutex(Differences), Interrupts, what type of issues you have faced in your project how did u solve them, Device driver how to allocate a new device procedure for that, what is priority inversion and priority inheritance. Do u know about jtag? What debbugin tools you have used to debug the issues. 1) Rotate an array for the given number of times.... 3 4 5 1 2 -->original array 1 2 3 4 5 -->rotated 2 times 2) Given an unsigned 32 bit integer, count the numer of occurrences of pattern 10 .....(Write program using bitwise operations only) 1000 --> 1 time ​ 101011001-->3 times 3rd Round: All OS concepts: What are different scheduling algorithms? What are synchronization techniques? Difference between Mutex and Semaphores? What is Deadlock? What is fragmentation in OS? What are pages in memory management? What is page fault when does it occur? What is Interrupt? What is cache memory, use of Virtual keyword, difference b/w process & Thread, what is fork, vfork. how fork is used, DMA(how controller works). RTOS some basic questions, Watchdog timer and how it is usefull. Why we use timers. Any bus protocols u have used. What is the need of synchronizing mechanism such as Semaphore and Mutex? And why do we need OS support for implementing these two. Puzzle: 25horses find minimum number of races to determine 1st, 2nd and 3rd place. Answer: 7
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Senior Embedded Engineer

Interviewed at Qualcomm

3.8★
Jul 22, 2021

Qualcomm (Linux Team): 1st Round: 1) You are given two 32-bit numbers M and N, and two bit positions I and j. Write a function to insert M into N at I and assume that the space j-I can compass all the required bits of M 2) You are given a function read(int blockNo, void *buf) - returns a 512 byte block. read_offset_size(int offset, int size, void *buf) - implement this function using the above prototype 2nd round: DMA, Semaphore & mutex(Differences), Interrupts, what type of issues you have faced in your project how did u solve them, Device driver how to allocate a new device procedure for that, what is priority inversion and priority inheritance. Do u know about jtag? What debbugin tools you have used to debug the issues. 1) Rotate an array for the given number of times.... 3 4 5 1 2 -->original array 1 2 3 4 5 -->rotated 2 times 2) Given an unsigned 32 bit integer, count the numer of occurrences of pattern 10 .....(Write program using bitwise operations only) 1000 --> 1 time ​ 101011001-->3 times 3rd Round: All OS concepts: What are different scheduling algorithms? What are synchronization techniques? Difference between Mutex and Semaphores? What is Deadlock? What is fragmentation in OS? What are pages in memory management? What is page fault when does it occur? What is Interrupt? What is cache memory, use of Virtual keyword, difference b/w process & Thread, what is fork, vfork. how fork is used, DMA(how controller works). RTOS some basic questions, Watchdog timer and how it is usefull. Why we use timers. Any bus protocols u have used. What is the need of synchronizing mechanism such as Semaphore and Mutex? And why do we need OS support for implementing these two. Puzzle: 25horses find minimum number of races to determine 1st, 2nd and 3rd place. Answer: 7

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