Pedro Cruz / MMA8451Q

copy for backup

Fork of MMA8451Q by Antonio Quevedo

MMA8451Q.cpp@1:204a460446d7, 2016-10-19 (annotated)

Committer:
pedro_C
Date:
Wed Oct 19 10:26:07 2016 +0000
Revision:
1:204a460446d7
Parent:
0:7c9ab58f6af3 
my test

Who changed what in which revision?

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quevedo 0:7c9ab58f6af3 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
quevedo 0:7c9ab58f6af3 2 *
quevedo 0:7c9ab58f6af3 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
quevedo 0:7c9ab58f6af3 4 * and associated documentation files (the "Software"), to deal in the Software without
quevedo 0:7c9ab58f6af3 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
quevedo 0:7c9ab58f6af3 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
quevedo 0:7c9ab58f6af3 7 * Software is furnished to do so, subject to the following conditions:
quevedo 0:7c9ab58f6af3 8 *
quevedo 0:7c9ab58f6af3 9 * The above copyright notice and this permission notice shall be included in all copies or
quevedo 0:7c9ab58f6af3 10 * substantial portions of the Software.
quevedo 0:7c9ab58f6af3 11 *
quevedo 0:7c9ab58f6af3 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
quevedo 0:7c9ab58f6af3 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
quevedo 0:7c9ab58f6af3 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
quevedo 0:7c9ab58f6af3 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
quevedo 0:7c9ab58f6af3 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
quevedo 0:7c9ab58f6af3 17 */
quevedo 0:7c9ab58f6af3 18
quevedo 0:7c9ab58f6af3 19 #include "MMA8451Q.h"
quevedo 0:7c9ab58f6af3 20
pedro_C 1:204a460446d7 21 #define INT_SOURCE 0x0C
quevedo 0:7c9ab58f6af3 22 #define REG_WHO_AM_I 0x0D
pedro_C 1:204a460446d7 23 #define HP_FILTER_CUTOFF 0x0F
pedro_C 1:204a460446d7 24 #define PULSE_CFG 0x21
pedro_C 1:204a460446d7 25 #define PULSE_SRC 0x22
pedro_C 1:204a460446d7 26 #define PULSE_THSX 0x23
pedro_C 1:204a460446d7 27 #define PULSE_THSY 0x24
pedro_C 1:204a460446d7 28 #define PULSE_THSZ 0x25
pedro_C 1:204a460446d7 29 #define PULSE_TMLT 0x26
pedro_C 1:204a460446d7 30 #define PULSE_LTCY 0x27
pedro_C 1:204a460446d7 31 #define PULSE_WIND 0x28
pedro_C 1:204a460446d7 32 #define REG_CTRL_REG_1 0x2A
pedro_C 1:204a460446d7 33 #define CTRL_REG2 0x2B
pedro_C 1:204a460446d7 34 #define CTRL_REG4 0x2D
pedro_C 1:204a460446d7 35 #define CTRL_REG5 0x2E
quevedo 0:7c9ab58f6af3 36 #define REG_OUT_X_MSB 0x01
quevedo 0:7c9ab58f6af3 37 #define REG_OUT_Y_MSB 0x03
quevedo 0:7c9ab58f6af3 38 #define REG_OUT_Z_MSB 0x05
quevedo 0:7c9ab58f6af3 39
pedro_C 1:204a460446d7 40 #define UINT14_MAX 16383
pedro_C 1:204a460446d7 41
pedro_C 1:204a460446d7 42 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
pedro_C 1:204a460446d7 43 // activate the peripheral
pedro_C 1:204a460446d7 44 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
quevedo 0:7c9ab58f6af3 45 writeRegs(data, 2);
quevedo 0:7c9ab58f6af3 46 }
quevedo 0:7c9ab58f6af3 47
quevedo 0:7c9ab58f6af3 48 MMA8451Q::~MMA8451Q() { }
quevedo 0:7c9ab58f6af3 49
pedro_C 1:204a460446d7 50 uint8_t MMA8451Q::getWhoAmI() {
pedro_C 1:204a460446d7 51 uint8_t who_am_i = 0;
pedro_C 1:204a460446d7 52 readRegs(REG_WHO_AM_I, &who_am_i, 1);
pedro_C 1:204a460446d7 53 return who_am_i;
pedro_C 1:204a460446d7 54 }
pedro_C 1:204a460446d7 55
pedro_C 1:204a460446d7 56 float MMA8451Q::getAccX() {
pedro_C 1:204a460446d7 57 //divide by 4096 b/c MMA output is 4096 counts per g so this f outputs accelorometer value formatted to g (gravity)
pedro_C 1:204a460446d7 58 return (float(getAccAxis(REG_OUT_X_MSB))/4096.0);
pedro_C 1:204a460446d7 59 }
pedro_C 1:204a460446d7 60
pedro_C 1:204a460446d7 61 float MMA8451Q::getAccY() {
pedro_C 1:204a460446d7 62 return (float(getAccAxis(REG_OUT_Y_MSB))/4096.0);
pedro_C 1:204a460446d7 63 }
pedro_C 1:204a460446d7 64
pedro_C 1:204a460446d7 65 float MMA8451Q::getAccZ() {
pedro_C 1:204a460446d7 66 return (float(getAccAxis(REG_OUT_Z_MSB))/4096.0);
pedro_C 1:204a460446d7 67 }
pedro_C 1:204a460446d7 68
pedro_C 1:204a460446d7 69 void MMA8451Q::getAccAllAxis(float * res) {
pedro_C 1:204a460446d7 70 res[0] = getAccX();
pedro_C 1:204a460446d7 71 res[1] = getAccY();
pedro_C 1:204a460446d7 72 res[2] = getAccZ();
pedro_C 1:204a460446d7 73 }
pedro_C 1:204a460446d7 74
pedro_C 1:204a460446d7 75 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
pedro_C 1:204a460446d7 76 int16_t acc;
pedro_C 1:204a460446d7 77 uint8_t res[2];
pedro_C 1:204a460446d7 78 readRegs(addr, res, 2);
pedro_C 1:204a460446d7 79
pedro_C 1:204a460446d7 80 acc = (res[0] << 6) | (res[1] >> 2);
pedro_C 1:204a460446d7 81 if (acc > UINT14_MAX/2)
pedro_C 1:204a460446d7 82 acc -= UINT14_MAX;
pedro_C 1:204a460446d7 83
pedro_C 1:204a460446d7 84 return acc;
quevedo 0:7c9ab58f6af3 85 }
quevedo 0:7c9ab58f6af3 86
pedro_C 1:204a460446d7 87 void MMA8451Q::setDoubleTap(void){
pedro_C 1:204a460446d7 88 //Implemented directly from Freescale's AN4072
pedro_C 1:204a460446d7 89 //Added to MMA8451Q lib
pedro_C 1:204a460446d7 90
pedro_C 1:204a460446d7 91 uint8_t CTRL_REG1_Data;
pedro_C 1:204a460446d7 92 // int adds;
pedro_C 1:204a460446d7 93 uint8_t data[2] = {REG_CTRL_REG_1, 0x08};
pedro_C 1:204a460446d7 94
pedro_C 1:204a460446d7 95 //400 Hz, Standby Mode
pedro_C 1:204a460446d7 96 writeRegs(data,2);
pedro_C 1:204a460446d7 97
pedro_C 1:204a460446d7 98 //Enable X, Y and Z Double Pulse with DPA = 0 no double pulse abort
pedro_C 1:204a460446d7 99 data[0]=PULSE_CFG;data[1]=0x2A;
pedro_C 1:204a460446d7 100 writeRegs(data,2);
pedro_C 1:204a460446d7 101
pedro_C 1:204a460446d7 102 //SetThreshold 3g on X and Y and 5g on Z
pedro_C 1:204a460446d7 103 //Note: Every step is 0.063g
pedro_C 1:204a460446d7 104 //3 g/0.063g = 48 counts
pedro_C 1:204a460446d7 105 //5g/0.063g = 79 counts
pedro_C 1:204a460446d7 106 data[0]=PULSE_THSX;data[1]=0x30;
pedro_C 1:204a460446d7 107 writeRegs(data,2);//Set X Threshold to 3g
pedro_C 1:204a460446d7 108 data[0]=PULSE_THSY;data[1]=0x30;
pedro_C 1:204a460446d7 109 writeRegs(data,2);//Set Y Threshold to 3g
pedro_C 1:204a460446d7 110 data[0]=PULSE_THSZ;data[1]=0x4F;
pedro_C 1:204a460446d7 111 writeRegs(data,2);//Set Z Threshold to 5g
pedro_C 1:204a460446d7 112
pedro_C 1:204a460446d7 113 //Set Time Limit for Tap Detection to 60 ms LP Mode
pedro_C 1:204a460446d7 114 //Note: 400 Hz ODR, Time step is 1.25 ms per step
pedro_C 1:204a460446d7 115 //60 ms/1.25 ms = 48 counts
pedro_C 1:204a460446d7 116 data[0]=PULSE_TMLT;data[1]=0x30;
pedro_C 1:204a460446d7 117 writeRegs(data,2);//60 ms
pedro_C 1:204a460446d7 118
pedro_C 1:204a460446d7 119 //Set Latency Time to 200 ms
pedro_C 1:204a460446d7 120 //Note: 400 Hz ODR LPMode, Time step is 2.5 ms per step 00 ms/2.5 ms = 80 counts
pedro_C 1:204a460446d7 121 data[0]=PULSE_LTCY;data[1]=0x50;
pedro_C 1:204a460446d7 122 writeRegs(data,2);//200 ms
pedro_C 1:204a460446d7 123
pedro_C 1:204a460446d7 124 //Set Time Window for second tap to 300 ms
pedro_C 1:204a460446d7 125 //Note: 400 Hz ODR LP Mode, Time step is 2.5 ms per step
pedro_C 1:204a460446d7 126 //300 ms/2.5 ms = 120 counts
pedro_C 1:204a460446d7 127 data[0]=PULSE_WIND;data[1]=0x78;
pedro_C 1:204a460446d7 128 writeRegs(data,2);//300 ms
pedro_C 1:204a460446d7 129
pedro_C 1:204a460446d7 130 //Route INT1 to System Interrupt
pedro_C 1:204a460446d7 131 data[0]=CTRL_REG4;data[1]=0x08;
pedro_C 1:204a460446d7 132 writeRegs(data,2);//Enable Pulse Interrupt in System CTRL_REG4
pedro_C 1:204a460446d7 133 data[0]=CTRL_REG5;data[1]=0x08;
pedro_C 1:204a460446d7 134 writeRegs(data,2);//Route Pulse Interrupt to INT1 hardware Pin CTRL_REG5
pedro_C 1:204a460446d7 135
pedro_C 1:204a460446d7 136 //Set the device to Active Mode
pedro_C 1:204a460446d7 137 readRegs(0x2A,&CTRL_REG1_Data,1);//Read out the contents of the register
pedro_C 1:204a460446d7 138 CTRL_REG1_Data |= 0x01; //Change the value in the register to Active Mode.
pedro_C 1:204a460446d7 139 data[0]=REG_CTRL_REG_1;
pedro_C 1:204a460446d7 140 data[1]=CTRL_REG1_Data;
pedro_C 1:204a460446d7 141 writeRegs(data,2);//Write in the updated value to put the device in Active Mode
pedro_C 1:204a460446d7 142 }
pedro_C 1:204a460446d7 143
pedro_C 1:204a460446d7 144
quevedo 0:7c9ab58f6af3 145 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
quevedo 0:7c9ab58f6af3 146 char t[1] = {addr};
pedro_C 1:204a460446d7 147 m_i2c.write(m_addr, t, 1, true);
pedro_C 1:204a460446d7 148 m_i2c.read(m_addr, (char *)data, len);
quevedo 0:7c9ab58f6af3 149 }
quevedo 0:7c9ab58f6af3 150
pedro_C 1:204a460446d7 151
pedro_C 1:204a460446d7 152
quevedo 0:7c9ab58f6af3 153 void MMA8451Q::writeRegs(uint8_t * data, int len) {
pedro_C 1:204a460446d7 154 m_i2c.write(m_addr, (char *)data, len);
pedro_C 1:204a460446d7 155 }