1 | /*
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2 | ****************************************************************************
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3 | * This file is part of Arduino Lucky Shield Library
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4 | *
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5 | * Copyright (c) 2016 Arduino srl. All right reserved.
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6 | *
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7 | * File : MMA8491Q.cpp
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8 | * Date : 2016/03/21
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9 | * Revision : 0.0.1 $
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10 | * Author: andrea[at]arduino[dot]org
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11 | *
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12 | ****************************************************************************
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13 |
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14 | This library is free software; you can redistribute it and/or
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15 | modify it under the terms of the GNU Lesser General Public
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16 | License as published by the Free Software Foundation; either
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17 | version 2.1 of the License, or (at your option) any later version.
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18 |
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19 | This library is distributed in the hope that it will be useful,
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20 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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22 | Lesser General Public License for more details.
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23 |
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24 | You should have received a copy of the GNU Lesser General Public
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25 | License along with this library; if not, write to the Free Software
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26 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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27 |
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28 | ******************************************************************************/
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29 |
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30 | #include "MMA8491Q.h"
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31 | #include <Wire.h>
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32 |
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33 | #ifdef __SAM3X8E__
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34 | #define Wire Wire1
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35 | #endif
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36 |
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37 | // CONSTRUCTUR
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38 | MMA8491Q::MMA8491Q(uint8_t addr)
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39 | {
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40 | address = addr; // Store address into private variable
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41 | }
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42 |
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43 | void MMA8491Q::read(){
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44 | readRegister(STATE);
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45 | }
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46 |
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47 | void MMA8491Q::enable(){
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48 |
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49 | Wire.beginTransmission(GPIO_ADDRESS); //read the gpio expander value
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50 | Wire.write(GPIO_READ);
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51 | Wire.endTransmission();
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52 | Wire.requestFrom(GPIO_ADDRESS,(byte)1);
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53 | if(Wire.available()) {
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54 | data_read = Wire.read();
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55 | }
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56 | data_read = data_read | 0x01; //enable
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57 | Wire.beginTransmission(GPIO_ADDRESS);
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58 | Wire.write(GPIO_WRITE_PORT0);
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59 | Wire.write(data_read);
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60 | Wire.endTransmission();
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61 | }
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62 |
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63 | void MMA8491Q::disable(){
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64 |
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65 | Wire.beginTransmission(GPIO_ADDRESS);
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66 | Wire.write(GPIO_WRITE_PORT0);
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67 | Wire.write(data_read & 0xFE); //disable
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68 | Wire.endTransmission();
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69 |
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70 | }
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71 |
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72 | float MMA8491Q::value(int val){
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73 |
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74 | if (val < 0x2000)
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75 | return float(val)/1024; // read value is between 0 and 8191 (0g 8g)
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76 | else
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77 | return float((0x1FFF & val) - 0x2000)/1024;
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78 |
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79 | }
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80 |
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81 | void MMA8491Q::readRegister(int reg)
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82 | {
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83 | enable();
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84 | delay(5);
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85 | Wire.beginTransmission(address);
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86 | Wire.write(reg);
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87 | Wire.endTransmission();
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88 | Wire.requestFrom(address, (byte)7);
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89 | state = Wire.read();
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90 | cx = Wire.read(); cx <<= 8; cx |= Wire.read(); cx >>= 2;
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91 | cy = Wire.read(); cy <<= 8; cy |= Wire.read(); cy >>= 2;
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92 | cz = Wire.read(); cz <<= 8; cz |= Wire.read(); cz >>= 2;
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93 | x_ = value(cx);
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94 | y_ = value(cy);
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95 | z_ = value(cz);
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96 | disable();
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97 |
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98 | }
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99 |
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100 | MMA8491Q mma8491q;
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