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1 | 6 | kaklik | /*! \file fixedpt.h \brief Fixed-point math function library. */ |
2 | //***************************************************************************** |
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3 | // |
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4 | // File Name : 'fixedpt.h' |
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5 | // Title : Fixed-point math function library |
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6 | // Author : Pascal Stang - Copyright (C) 2003 |
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7 | // Created : 2003.01.26 |
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8 | // Revised : 2003.02.04 |
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9 | // Version : 0.1 |
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10 | // Target MCU : Atmel AVR Series |
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11 | // Editor Tabs : 4 |
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12 | // |
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13 | // NOTE: This code is currently below version 1.0, and therefore is considered |
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14 | // to be lacking in some functionality or documentation, or may not be fully |
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15 | // tested. Nonetheless, you can expect most functions to work. |
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16 | // |
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17 | /// \ingroup general |
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18 | /// \defgroup fixedpt Fixed-Point Math Function Library (fixedpt.c) |
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19 | /// \code #include "fixedpt.h" \endcode |
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20 | /// \par Overview |
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21 | /// This library provides basic fixed-point math operations implemented in |
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22 | /// C. Fixed-point math is a system by which integer variables can |
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23 | /// represent fractional values with a fixed precision "behind" the decimal |
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24 | /// point (like a fixed number of decimal places). Fixed-point math is |
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25 | /// typically 10x faster to execute than floating-point math, and should |
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26 | /// be used when a limited amount of fractional precision is sufficient |
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27 | /// (such as 4ths, or 10ths, or 128ths, etc). |
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28 | /// |
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29 | /// \note This library is really meant more as a demonstration of fixed-pt |
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30 | /// math. For best code-efficiency and speed, you are enouraged to take |
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31 | /// the code you see in these functions and copy it into your own code. |
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32 | // |
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33 | // This code is distributed under the GNU Public License |
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34 | // which can be found at http://www.gnu.org/licenses/gpl.txt |
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35 | // |
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36 | //***************************************************************************** |
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37 | |||
38 | #ifndef FIXEDPT_H |
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39 | #define FIXEDPT_H |
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40 | |||
41 | #include "global.h" |
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42 | |||
43 | // constants/macros/typdefs |
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44 | |||
45 | // functions |
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46 | |||
47 | //! fixedptInit() initializes fixed-point math function library |
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48 | // set the number of bits to use behind the point |
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49 | void fixedptInit(u08 fixedPtBits); |
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50 | |||
51 | //! convert integer to fixed-point number |
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52 | s32 fixedptConvertFromInt(s32 int_number); |
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53 | |||
54 | //! convert fixed-point number to integer |
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55 | s32 fixedptConvertToInt(s32 fp_number); |
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56 | |||
57 | //! add a and b (a+b) with fixed-point math |
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58 | s32 fixedptAdd(s32 a, s32 b); |
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59 | |||
60 | //! subtract a and b (a-b) with fixed-point math |
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61 | s32 fixedptSubtract(s32 a, s32 b); |
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62 | |||
63 | //! multiply a and b (a*b) with fixed-point math |
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64 | s32 fixedptMultiply(s32 a, s32 b); |
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65 | |||
66 | //! divide numer by denom (numer/denom) with fixed-point math |
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67 | s32 fixedptDivide(s32 numer, s32 denom); |
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68 | |||
69 | #endif |
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