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Describe volatile, const, static keywords. How do you share data between interrupt handler and main thread if you do not have an OS with your embedded controller? How do you optimize linear piecewise function in terms of speed?
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Embedded Fw (Firmware) Engineer

Interviewed at Nest

3.6★
Aug 4, 2015

Describe volatile, const, static keywords. How do you share data between interrupt handler and main thread if you do not have an OS with your embedded controller? How do you optimize linear piecewise function in terms of speed?

/** * Represents a grid of hexagonal tiles, kind of * like a honeycomb. * ___ ___ ___ * / 0 \___/ 6 \___/12 \___ * \___/ 3 \___/ 9 \___/15 \ * / 1 \___/ 7 \___/13 \___/ * \___/ 4 \___/10 \___/16 \ * / 2 \___/ 8 \___/14 \___/ * \___/ 5 \___/11 \___/17 \ * \___/ \___/ \___/ * * The above example is of height 3 and width 6, * but other sizes can be specified. * * It takes into account six cardinal directions. * * N * NW ___ NE * / \ * \___/ * SW SE * S */ public static class HexGrid { public static int EMPTY = -1; public HexGrid(int height, int width) { // TODO: Implement me! } /** * Returns the list of neighbors for a given tile in clockwise order, starting with N. * Any empty tiles will be represented as {@link #EMPTY}. * * @param index of the tile of interest * @return tiles that are adjacent, clockwise starting with N. */ public List<Integer> getTileNeighbors(int index) { // TODO: Implement me! return null; } } }
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Android Embedded Engineer

Interviewed at Block

3.3★
Sep 2, 2016

/** * Represents a grid of hexagonal tiles, kind of * like a honeycomb. * ___ ___ ___ * / 0 \___/ 6 \___/12 \___ * \___/ 3 \___/ 9 \___/15 \ * / 1 \___/ 7 \___/13 \___/ * \___/ 4 \___/10 \___/16 \ * / 2 \___/ 8 \___/14 \___/ * \___/ 5 \___/11 \___/17 \ * \___/ \___/ \___/ * * The above example is of height 3 and width 6, * but other sizes can be specified. * * It takes into account six cardinal directions. * * N * NW ___ NE * / \ * \___/ * SW SE * S */ public static class HexGrid { public static int EMPTY = -1; public HexGrid(int height, int width) { // TODO: Implement me! } /** * Returns the list of neighbors for a given tile in clockwise order, starting with N. * Any empty tiles will be represented as {@link #EMPTY}. * * @param index of the tile of interest * @return tiles that are adjacent, clockwise starting with N. */ public List<Integer> getTileNeighbors(int index) { // TODO: Implement me! return null; } } }

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