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Senior Firmware Engineer Interview Questions

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How to invert all the bits in a byte? e.g. 0x55 should be changed to 0xAA.

3 Answers

Take 1's complement using ~

But how do you implement ~?

mask=0xffffffff; no^=mask;

Technical C programming and logic questions.

1 Answer

most "difficult" was a discussion of an IO driver, embracing merits/demerits of implementation methods, including polled v's interrupt, OS impact, buffering, layering etc

1 Answer

You are in one room with three light switches, only one of which controls a light in another room. All the switches are in the off positiona and the light is currently off. You have one opportunity to observe the light in the other room. How do you determine which switch controls it?

1 Answer

A co-worker said he was asked if he is more comfortable in the time domain or position domain.

1 Answer

What are some of the python libraries you have used

1 Answer

A HW engineer asked how to code a "SINE FUNCTION" without library call.

The interviewer in this case, drew a simple interrupt multiplexing circuit (and associated MM registers to program/control interrupts) with a processor receiving the input, and asked me to write some code to test the proper operation of the hardware.

1 Answer

Describe a Linux driver.

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