Wojciech Rynczuk / Mbed 2 deprecated DP_Demo

Dni Przedsiebierczosci Demo

Dependencies:   mbed

MMA8451Q/MMA8451Q.cpp@0:eb5dfc6d9eae, 2017-04-21 (annotated)

Committer:
ketjow
Date:
Fri Apr 21 08:25:54 2017 +0000
Revision:
0:eb5dfc6d9eae
Initial

Who changed what in which revision?

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ketjow 0:eb5dfc6d9eae 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
ketjow 0:eb5dfc6d9eae 2 *
ketjow 0:eb5dfc6d9eae 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
ketjow 0:eb5dfc6d9eae 4 * and associated documentation files (the "Software"), to deal in the Software without
ketjow 0:eb5dfc6d9eae 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
ketjow 0:eb5dfc6d9eae 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
ketjow 0:eb5dfc6d9eae 7 * Software is furnished to do so, subject to the following conditions:
ketjow 0:eb5dfc6d9eae 8 *
ketjow 0:eb5dfc6d9eae 9 * The above copyright notice and this permission notice shall be included in all copies or
ketjow 0:eb5dfc6d9eae 10 * substantial portions of the Software.
ketjow 0:eb5dfc6d9eae 11 *
ketjow 0:eb5dfc6d9eae 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
ketjow 0:eb5dfc6d9eae 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
ketjow 0:eb5dfc6d9eae 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
ketjow 0:eb5dfc6d9eae 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ketjow 0:eb5dfc6d9eae 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
ketjow 0:eb5dfc6d9eae 17 */
ketjow 0:eb5dfc6d9eae 18
ketjow 0:eb5dfc6d9eae 19 #include "MMA8451Q.h"
ketjow 0:eb5dfc6d9eae 20
ketjow 0:eb5dfc6d9eae 21 #define INT_SOURCE 0x0C
ketjow 0:eb5dfc6d9eae 22 #define REG_WHO_AM_I 0x0D
ketjow 0:eb5dfc6d9eae 23 #define HP_FILTER_CUTOFF 0x0F
ketjow 0:eb5dfc6d9eae 24 #define PULSE_CFG 0x21
ketjow 0:eb5dfc6d9eae 25 #define PULSE_SRC 0x22
ketjow 0:eb5dfc6d9eae 26 #define PULSE_THSX 0x23
ketjow 0:eb5dfc6d9eae 27 #define PULSE_THSY 0x24
ketjow 0:eb5dfc6d9eae 28 #define PULSE_THSZ 0x25
ketjow 0:eb5dfc6d9eae 29 #define PULSE_TMLT 0x26
ketjow 0:eb5dfc6d9eae 30 #define PULSE_LTCY 0x27
ketjow 0:eb5dfc6d9eae 31 #define PULSE_WIND 0x28
ketjow 0:eb5dfc6d9eae 32 #define REG_CTRL_REG_1 0x2A
ketjow 0:eb5dfc6d9eae 33 #define CTRL_REG2 0x2B
ketjow 0:eb5dfc6d9eae 34 #define CTRL_REG4 0x2D
ketjow 0:eb5dfc6d9eae 35 #define CTRL_REG5 0x2E
ketjow 0:eb5dfc6d9eae 36 #define REG_OUT_X_MSB 0x01
ketjow 0:eb5dfc6d9eae 37 #define REG_OUT_Y_MSB 0x03
ketjow 0:eb5dfc6d9eae 38 #define REG_OUT_Z_MSB 0x05
ketjow 0:eb5dfc6d9eae 39
ketjow 0:eb5dfc6d9eae 40 #define UINT14_MAX 16383
ketjow 0:eb5dfc6d9eae 41
ketjow 0:eb5dfc6d9eae 42 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
ketjow 0:eb5dfc6d9eae 43 // activate the peripheral
ketjow 0:eb5dfc6d9eae 44 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
ketjow 0:eb5dfc6d9eae 45 writeRegs(data, 2);
ketjow 0:eb5dfc6d9eae 46 }
ketjow 0:eb5dfc6d9eae 47
ketjow 0:eb5dfc6d9eae 48 MMA8451Q::~MMA8451Q() { }
ketjow 0:eb5dfc6d9eae 49
ketjow 0:eb5dfc6d9eae 50 uint8_t MMA8451Q::getWhoAmI() {
ketjow 0:eb5dfc6d9eae 51 uint8_t who_am_i = 0;
ketjow 0:eb5dfc6d9eae 52 readRegs(REG_WHO_AM_I, &who_am_i, 1);
ketjow 0:eb5dfc6d9eae 53 return who_am_i;
ketjow 0:eb5dfc6d9eae 54 }
ketjow 0:eb5dfc6d9eae 55
ketjow 0:eb5dfc6d9eae 56 float MMA8451Q::getAccX() {
ketjow 0:eb5dfc6d9eae 57 //divide by 4096 b/c MMA output is 4096 counts per g so this f outputs accelorometer value formatted to g (gravity)
ketjow 0:eb5dfc6d9eae 58 return (float(getAccAxis(REG_OUT_X_MSB))/4096.0);
ketjow 0:eb5dfc6d9eae 59 }
ketjow 0:eb5dfc6d9eae 60
ketjow 0:eb5dfc6d9eae 61 float MMA8451Q::getAccY() {
ketjow 0:eb5dfc6d9eae 62 return (float(getAccAxis(REG_OUT_Y_MSB))/4096.0);
ketjow 0:eb5dfc6d9eae 63 }
ketjow 0:eb5dfc6d9eae 64
ketjow 0:eb5dfc6d9eae 65 float MMA8451Q::getAccZ() {
ketjow 0:eb5dfc6d9eae 66 return (float(getAccAxis(REG_OUT_Z_MSB))/4096.0);
ketjow 0:eb5dfc6d9eae 67 }
ketjow 0:eb5dfc6d9eae 68
ketjow 0:eb5dfc6d9eae 69 void MMA8451Q::getAccAllAxis(float * res) {
ketjow 0:eb5dfc6d9eae 70 res[0] = getAccX();
ketjow 0:eb5dfc6d9eae 71 res[1] = getAccY();
ketjow 0:eb5dfc6d9eae 72 res[2] = getAccZ();
ketjow 0:eb5dfc6d9eae 73 }
ketjow 0:eb5dfc6d9eae 74
ketjow 0:eb5dfc6d9eae 75 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
ketjow 0:eb5dfc6d9eae 76 int16_t acc;
ketjow 0:eb5dfc6d9eae 77 uint8_t res[2];
ketjow 0:eb5dfc6d9eae 78 readRegs(addr, res, 2);
ketjow 0:eb5dfc6d9eae 79
ketjow 0:eb5dfc6d9eae 80 acc = (res[0] << 6) | (res[1] >> 2);
ketjow 0:eb5dfc6d9eae 81 if (acc > UINT14_MAX/2)
ketjow 0:eb5dfc6d9eae 82 acc -= UINT14_MAX;
ketjow 0:eb5dfc6d9eae 83
ketjow 0:eb5dfc6d9eae 84 return acc;
ketjow 0:eb5dfc6d9eae 85 }
ketjow 0:eb5dfc6d9eae 86
ketjow 0:eb5dfc6d9eae 87 void MMA8451Q::setDoubleTap(void){
ketjow 0:eb5dfc6d9eae 88 //Implemented directly from Freescale's AN4072
ketjow 0:eb5dfc6d9eae 89 //Added to MMA8451Q lib
ketjow 0:eb5dfc6d9eae 90
ketjow 0:eb5dfc6d9eae 91 uint8_t CTRL_REG1_Data;
ketjow 0:eb5dfc6d9eae 92 // int adds;
ketjow 0:eb5dfc6d9eae 93 uint8_t data[2] = {REG_CTRL_REG_1, 0x08};
ketjow 0:eb5dfc6d9eae 94
ketjow 0:eb5dfc6d9eae 95 //400 Hz, Standby Mode
ketjow 0:eb5dfc6d9eae 96 writeRegs(data,2);
ketjow 0:eb5dfc6d9eae 97
ketjow 0:eb5dfc6d9eae 98 //Enable X, Y and Z Double Pulse with DPA = 0 no double pulse abort
ketjow 0:eb5dfc6d9eae 99 data[0]=PULSE_CFG;data[1]=0x2A;
ketjow 0:eb5dfc6d9eae 100 writeRegs(data,2);
ketjow 0:eb5dfc6d9eae 101
ketjow 0:eb5dfc6d9eae 102 //SetThreshold 3g on X and Y and 5g on Z
ketjow 0:eb5dfc6d9eae 103 //Note: Every step is 0.063g
ketjow 0:eb5dfc6d9eae 104 //3 g/0.063g = 48 counts
ketjow 0:eb5dfc6d9eae 105 //5g/0.063g = 79 counts
ketjow 0:eb5dfc6d9eae 106 data[0]=PULSE_THSX;data[1]=0x30;
ketjow 0:eb5dfc6d9eae 107 writeRegs(data,2);//Set X Threshold to 3g
ketjow 0:eb5dfc6d9eae 108 data[0]=PULSE_THSY;data[1]=0x30;
ketjow 0:eb5dfc6d9eae 109 writeRegs(data,2);//Set Y Threshold to 3g
ketjow 0:eb5dfc6d9eae 110 data[0]=PULSE_THSZ;data[1]=0x4F;
ketjow 0:eb5dfc6d9eae 111 writeRegs(data,2);//Set Z Threshold to 5g
ketjow 0:eb5dfc6d9eae 112
ketjow 0:eb5dfc6d9eae 113 //Set Time Limit for Tap Detection to 60 ms LP Mode
ketjow 0:eb5dfc6d9eae 114 //Note: 400 Hz ODR, Time step is 1.25 ms per step
ketjow 0:eb5dfc6d9eae 115 //60 ms/1.25 ms = 48 counts
ketjow 0:eb5dfc6d9eae 116 data[0]=PULSE_TMLT;data[1]=0x30;
ketjow 0:eb5dfc6d9eae 117 writeRegs(data,2);//60 ms
ketjow 0:eb5dfc6d9eae 118
ketjow 0:eb5dfc6d9eae 119 //Set Latency Time to 200 ms
ketjow 0:eb5dfc6d9eae 120 //Note: 400 Hz ODR LPMode, Time step is 2.5 ms per step 00 ms/2.5 ms = 80 counts
ketjow 0:eb5dfc6d9eae 121 data[0]=PULSE_LTCY;data[1]=0x50;
ketjow 0:eb5dfc6d9eae 122 writeRegs(data,2);//200 ms
ketjow 0:eb5dfc6d9eae 123
ketjow 0:eb5dfc6d9eae 124 //Set Time Window for second tap to 300 ms
ketjow 0:eb5dfc6d9eae 125 //Note: 400 Hz ODR LP Mode, Time step is 2.5 ms per step
ketjow 0:eb5dfc6d9eae 126 //300 ms/2.5 ms = 120 counts
ketjow 0:eb5dfc6d9eae 127 data[0]=PULSE_WIND;data[1]=0x78;
ketjow 0:eb5dfc6d9eae 128 writeRegs(data,2);//300 ms
ketjow 0:eb5dfc6d9eae 129
ketjow 0:eb5dfc6d9eae 130 //Route INT1 to System Interrupt
ketjow 0:eb5dfc6d9eae 131 data[0]=CTRL_REG4;data[1]=0x08;
ketjow 0:eb5dfc6d9eae 132 writeRegs(data,2);//Enable Pulse Interrupt in System CTRL_REG4
ketjow 0:eb5dfc6d9eae 133 data[0]=CTRL_REG5;data[1]=0x08;
ketjow 0:eb5dfc6d9eae 134 writeRegs(data,2);//Route Pulse Interrupt to INT1 hardware Pin CTRL_REG5
ketjow 0:eb5dfc6d9eae 135
ketjow 0:eb5dfc6d9eae 136 //Set the device to Active Mode
ketjow 0:eb5dfc6d9eae 137 readRegs(0x2A,&CTRL_REG1_Data,1);//Read out the contents of the register
ketjow 0:eb5dfc6d9eae 138 CTRL_REG1_Data |= 0x01; //Change the value in the register to Active Mode.
ketjow 0:eb5dfc6d9eae 139 data[0]=REG_CTRL_REG_1;
ketjow 0:eb5dfc6d9eae 140 data[1]=CTRL_REG1_Data;
ketjow 0:eb5dfc6d9eae 141 writeRegs(data,2);//Write in the updated value to put the device in Active Mode
ketjow 0:eb5dfc6d9eae 142 }
ketjow 0:eb5dfc6d9eae 143
ketjow 0:eb5dfc6d9eae 144
ketjow 0:eb5dfc6d9eae 145 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
ketjow 0:eb5dfc6d9eae 146 char t[1] = {addr};
ketjow 0:eb5dfc6d9eae 147 m_i2c.write(m_addr, t, 1, true);
ketjow 0:eb5dfc6d9eae 148 m_i2c.read(m_addr, (char *)data, len);
ketjow 0:eb5dfc6d9eae 149 }
ketjow 0:eb5dfc6d9eae 150
ketjow 0:eb5dfc6d9eae 151
ketjow 0:eb5dfc6d9eae 152
ketjow 0:eb5dfc6d9eae 153 void MMA8451Q::writeRegs(uint8_t * data, int len) {
ketjow 0:eb5dfc6d9eae 154 m_i2c.write(m_addr, (char *)data, len);
ketjow 0:eb5dfc6d9eae 155 }