Kenneth Lujan / MMA8451Q8

KLUJA-SSD447-Hw8.1

Fork of MMA8451Q8 by Stanley Cohen

MMA8451Q8.cpp@8:be66db51aa76, 2017-03-08 (annotated)

Committer:
kennylujan42
Date:
Wed Mar 08 17:46:27 2017 +0000
Revision:
8:be66db51aa76
Parent:
7:7812354ef684 
KLUJ-SSD447-HW8.1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 1:d2630136d51e 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
samux 1:d2630136d51e 2 *
samux 1:d2630136d51e 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
samux 1:d2630136d51e 4 * and associated documentation files (the "Software"), to deal in the Software without
samux 1:d2630136d51e 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
samux 1:d2630136d51e 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
samux 1:d2630136d51e 7 * Software is furnished to do so, subject to the following conditions:
samux 1:d2630136d51e 8 *
samux 1:d2630136d51e 9 * The above copyright notice and this permission notice shall be included in all copies or
samux 1:d2630136d51e 10 * substantial portions of the Software.
samux 1:d2630136d51e 11 *
samux 1:d2630136d51e 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
samux 1:d2630136d51e 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
samux 1:d2630136d51e 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
samux 1:d2630136d51e 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux 1:d2630136d51e 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
samux 1:d2630136d51e 17 */
scohennm 5:be042e8c1756 18 // Modify to change full scale gravity range 141207 sc
samux 1:d2630136d51e 19
scohennm 5:be042e8c1756 20
scohennm 5:be042e8c1756 21 #include "MMA8451Q8.h"
emilmont 0:6149091f755d 22
samux 1:d2630136d51e 23 #define REG_WHO_AM_I 0x0D
samux 1:d2630136d51e 24 #define REG_CTRL_REG_1 0x2A
emilmont 0:6149091f755d 25 #define REG_OUT_X_MSB 0x01
emilmont 0:6149091f755d 26 #define REG_OUT_Y_MSB 0x03
emilmont 0:6149091f755d 27 #define REG_OUT_Z_MSB 0x05
scohennm 5:be042e8c1756 28 #define XYZ_DATA_CFG 0x0E
emilmont 0:6149091f755d 29
samux 1:d2630136d51e 30 #define UINT14_MAX 16383
emilmont 0:6149091f755d 31
scohennm 5:be042e8c1756 32 #define MAX_2G 0x00
scohennm 5:be042e8c1756 33 #define MAX_4G 0x01
scohennm 6:c29386367dcf 34 #define MAX_8G 0x02
scohennm 5:be042e8c1756 35
kennylujan42 8:be66db51aa76 36 //#define GSCALING 1024.0
kennylujan42 8:be66db51aa76 37
kennylujan42 8:be66db51aa76 38 #define NUM_DATA 2
kennylujan42 8:be66db51aa76 39 #define GSCALING 1024.0
kennylujan42 8:be66db51aa76 40 #define ADDRESS_INDEX 0
kennylujan42 8:be66db51aa76 41 #define DATA_INDEX 1
kennylujan42 8:be66db51aa76 42
kennylujan42 8:be66db51aa76 43 float gScaling[3] = {4095.0,2048.0,1024.0};///////////////
scohennm 5:be042e8c1756 44
emilmont 0:6149091f755d 45 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
emilmont 0:6149091f755d 46 // activate the peripheral
emilmont 0:6149091f755d 47 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
samux 1:d2630136d51e 48 writeRegs(data, 2);
emilmont 0:6149091f755d 49 }
emilmont 0:6149091f755d 50
emilmont 0:6149091f755d 51 MMA8451Q::~MMA8451Q() { }
emilmont 0:6149091f755d 52
kennylujan42 8:be66db51aa76 53 void MMA8451Q::setStandbyMode(){
kennylujan42 8:be66db51aa76 54 #define ACTIVEMASK 0x01
kennylujan42 8:be66db51aa76 55 uint8_t registerData[1];
kennylujan42 8:be66db51aa76 56 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
kennylujan42 8:be66db51aa76 57
kennylujan42 8:be66db51aa76 58 readRegs(REG_CTRL_REG_1, registerData, 1);
kennylujan42 8:be66db51aa76 59 data[1] = registerData[0] & ~ACTIVEMASK;
kennylujan42 8:be66db51aa76 60 writeRegs(data, NUM_DATA);
kennylujan42 8:be66db51aa76 61 }
kennylujan42 8:be66db51aa76 62 void MMA8451Q::setActiveMode(){
kennylujan42 8:be66db51aa76 63 #define ACTIVEMASK 0x01
kennylujan42 8:be66db51aa76 64 uint8_t registerData[1];
kennylujan42 8:be66db51aa76 65 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
kennylujan42 8:be66db51aa76 66
kennylujan42 8:be66db51aa76 67 readRegs(REG_CTRL_REG_1, registerData, 1);
kennylujan42 8:be66db51aa76 68 data[1] = registerData[0] | ACTIVEMASK;
kennylujan42 8:be66db51aa76 69 writeRegs(data, NUM_DATA);
kennylujan42 8:be66db51aa76 70 }
emilmont 0:6149091f755d 71 uint8_t MMA8451Q::getWhoAmI() {
emilmont 0:6149091f755d 72 uint8_t who_am_i = 0;
samux 1:d2630136d51e 73 readRegs(REG_WHO_AM_I, &who_am_i, 1);
emilmont 0:6149091f755d 74 return who_am_i;
emilmont 0:6149091f755d 75 }
kennylujan42 8:be66db51aa76 76 /*
scohennm 5:be042e8c1756 77 void MMA8451Q::setGLimit() {
scohennm 5:be042e8c1756 78 uint8_t data[2] = {REG_CTRL_REG_1, 0x00};
scohennm 5:be042e8c1756 79 writeRegs(data, 2); // put in standby
scohennm 5:be042e8c1756 80 data[0] = XYZ_DATA_CFG;
scohennm 7:7812354ef684 81 data[1] = MAX_8G;
scohennm 5:be042e8c1756 82 writeRegs(data, 2);// change g limit
scohennm 5:be042e8c1756 83 data[0] = REG_CTRL_REG_1;
scohennm 5:be042e8c1756 84 data[1] = 0x01;
scohennm 5:be042e8c1756 85 writeRegs(data, 2); // make active
kennylujan42 8:be66db51aa76 86 }*/
kennylujan42 8:be66db51aa76 87 void MMA8451Q::setGLimit(int gSelect){
kennylujan42 8:be66db51aa76 88
kennylujan42 8:be66db51aa76 89 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
kennylujan42 8:be66db51aa76 90 gChosen = gSelect;
kennylujan42 8:be66db51aa76 91 setStandbyMode();
kennylujan42 8:be66db51aa76 92 data[ADDRESS_INDEX] = XYZ_DATA_CFG;
kennylujan42 8:be66db51aa76 93 data[DATA_INDEX] = gChosen;
kennylujan42 8:be66db51aa76 94 writeRegs(data, 2);
kennylujan42 8:be66db51aa76 95 setActiveMode();
kennylujan42 8:be66db51aa76 96
scohennm 5:be042e8c1756 97 }
emilmont 0:6149091f755d 98
kennylujan42 8:be66db51aa76 99 int16_t MMA8451Q::getAccAxis(uint8_t addr){
kennylujan42 8:be66db51aa76 100 int16_t acc;
kennylujan42 8:be66db51aa76 101 uint8_t res[2];
kennylujan42 8:be66db51aa76 102 readRegs(addr, res, 2);
kennylujan42 8:be66db51aa76 103
kennylujan42 8:be66db51aa76 104 acc = (res[0] << 6) | (res[1] >> 2);
kennylujan42 8:be66db51aa76 105 if (acc > UINT14_MAX/2)
kennylujan42 8:be66db51aa76 106 acc -= UINT14_MAX;
kennylujan42 8:be66db51aa76 107
kennylujan42 8:be66db51aa76 108 return acc;
kennylujan42 8:be66db51aa76 109 }
chris 3:db7126dbd63f 110 float MMA8451Q::getAccX() {
scohennm 5:be042e8c1756 111 return (float(getAccAxis(REG_OUT_X_MSB))/GSCALING);
emilmont 0:6149091f755d 112 }
emilmont 0:6149091f755d 113
chris 3:db7126dbd63f 114 float MMA8451Q::getAccY() {
scohennm 5:be042e8c1756 115 return (float(getAccAxis(REG_OUT_Y_MSB))/GSCALING);
emilmont 0:6149091f755d 116 }
emilmont 0:6149091f755d 117
chris 3:db7126dbd63f 118 float MMA8451Q::getAccZ() {
scohennm 5:be042e8c1756 119 return (float(getAccAxis(REG_OUT_Z_MSB))/GSCALING);
emilmont 0:6149091f755d 120 }
emilmont 0:6149091f755d 121
chris 3:db7126dbd63f 122 void MMA8451Q::getAccAllAxis(float * res) {
emilmont 0:6149091f755d 123 res[0] = getAccX();
emilmont 0:6149091f755d 124 res[1] = getAccY();
emilmont 0:6149091f755d 125 res[2] = getAccZ();
emilmont 0:6149091f755d 126 }
kennylujan42 8:be66db51aa76 127 /*
emilmont 0:6149091f755d 128 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
emilmont 0:6149091f755d 129 int16_t acc;
emilmont 0:6149091f755d 130 uint8_t res[2];
samux 1:d2630136d51e 131 readRegs(addr, res, 2);
emilmont 0:6149091f755d 132
emilmont 0:6149091f755d 133 acc = (res[0] << 6) | (res[1] >> 2);
emilmont 0:6149091f755d 134 if (acc > UINT14_MAX/2)
emilmont 0:6149091f755d 135 acc -= UINT14_MAX;
emilmont 0:6149091f755d 136
emilmont 0:6149091f755d 137 return acc;
emilmont 0:6149091f755d 138 }
kennylujan42 8:be66db51aa76 139 */
samux 1:d2630136d51e 140 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
emilmont 0:6149091f755d 141 char t[1] = {addr};
emilmont 0:6149091f755d 142 m_i2c.write(m_addr, t, 1, true);
emilmont 0:6149091f755d 143 m_i2c.read(m_addr, (char *)data, len);
emilmont 0:6149091f755d 144 }
emilmont 0:6149091f755d 145
samux 1:d2630136d51e 146 void MMA8451Q::writeRegs(uint8_t * data, int len) {
emilmont 0:6149091f755d 147 m_i2c.write(m_addr, (char *)data, len);
emilmont 0:6149091f755d 148 }