Nathaniel Garcia / MMA8451Q8

Modified version of default library

Fork of MMA8451Q8 by Stanley Cohen

MMA8451Q8.cpp@8:5f33af1d2c27, 2017-03-08 (annotated)

Committer:
Raiden817
Date:
Wed Mar 08 16:27:12 2017 +0000
Revision:
8:5f33af1d2c27
Parent:
7:7812354ef684 
Modified to allow gSelect and standby mode and active mode are now functions

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
Raiden817 8:5f33af1d2c27 36 #define NUMDATA 2
scohennm 5:be042e8c1756 37 #define GSCALING 1024.0
Raiden817 8:5f33af1d2c27 38 #define ADDRESSINDEX 0
Raiden817 8:5f33af1d2c27 39 #define DATAINDEX 1
Raiden817 8:5f33af1d2c27 40 #define ACTIVEMASK 0x01
Raiden817 8:5f33af1d2c27 41
scohennm 5:be042e8c1756 42
emilmont 0:6149091f755d 43 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
emilmont 0:6149091f755d 44 // activate the peripheral
emilmont 0:6149091f755d 45 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
samux 1:d2630136d51e 46 writeRegs(data, 2);
emilmont 0:6149091f755d 47 }
emilmont 0:6149091f755d 48
emilmont 0:6149091f755d 49 MMA8451Q::~MMA8451Q() { }
emilmont 0:6149091f755d 50
emilmont 0:6149091f755d 51 uint8_t MMA8451Q::getWhoAmI() {
emilmont 0:6149091f755d 52 uint8_t who_am_i = 0;
samux 1:d2630136d51e 53 readRegs(REG_WHO_AM_I, &who_am_i, 1);
emilmont 0:6149091f755d 54 return who_am_i;
emilmont 0:6149091f755d 55 }
Raiden817 8:5f33af1d2c27 56 void MMA8451Q::setGLimit(int g) {
Raiden817 8:5f33af1d2c27 57 uint8_t data[2] = {REG_CTRL_REG_1, 0x00};
Raiden817 8:5f33af1d2c27 58 SetStandByMode();
Raiden817 8:5f33af1d2c27 59 data[ADDRESSINDEX] = XYZ_DATA_CFG;
Raiden817 8:5f33af1d2c27 60 data[DATAINDEX] = g
Raiden817 8:5f33af1d2c27 61 writeRegs(data, 2);// change g limit
Raiden817 8:5f33af1d2c27 62 SetActiveMode();
Raiden817 8:5f33af1d2c27 63 }
Raiden817 8:5f33af1d2c27 64
Raiden817 8:5f33af1d2c27 65 void MMA8451Q::SetStandByMode() {
Raiden817 8:5f33af1d2c27 66 uint8_t registerData[1];
Raiden817 8:5f33af1d2c27 67 uint8_t data[NUMDATA] = {REG_CTRL_REG_1, 0x00};
Raiden817 8:5f33af1d2c27 68
Raiden817 8:5f33af1d2c27 69 readRegs(REG_CTRL_REG_1, registerData, 1);
Raiden817 8:5f33af1d2c27 70 data[1] = registerData[0] & ~ACTIVEMASK;
scohennm 5:be042e8c1756 71 writeRegs(data, 2); // put in standby
Raiden817 8:5f33af1d2c27 72 }
Raiden817 8:5f33af1d2c27 73
Raiden817 8:5f33af1d2c27 74 void MMA8451Q::SetActiveMode() {
Raiden817 8:5f33af1d2c27 75 uint8_t registerData[1];
Raiden817 8:5f33af1d2c27 76 uint8_t data[2] = {REG_CTRL_REG_1, 0x00};
Raiden817 8:5f33af1d2c27 77
Raiden817 8:5f33af1d2c27 78 readRegs(REG_CTRL_REG_1, registerData, 1);
Raiden817 8:5f33af1d2c27 79 data[1] = registerData[0] | ACTIVEMASK;
Raiden817 8:5f33af1d2c27 80 writeRegs(data, NUMDATA); // put in standby
scohennm 5:be042e8c1756 81 }
emilmont 0:6149091f755d 82
chris 3:db7126dbd63f 83 float MMA8451Q::getAccX() {
scohennm 5:be042e8c1756 84 return (float(getAccAxis(REG_OUT_X_MSB))/GSCALING);
emilmont 0:6149091f755d 85 }
emilmont 0:6149091f755d 86
chris 3:db7126dbd63f 87 float MMA8451Q::getAccY() {
scohennm 5:be042e8c1756 88 return (float(getAccAxis(REG_OUT_Y_MSB))/GSCALING);
emilmont 0:6149091f755d 89 }
emilmont 0:6149091f755d 90
chris 3:db7126dbd63f 91 float MMA8451Q::getAccZ() {
scohennm 5:be042e8c1756 92 return (float(getAccAxis(REG_OUT_Z_MSB))/GSCALING);
emilmont 0:6149091f755d 93 }
emilmont 0:6149091f755d 94
chris 3:db7126dbd63f 95 void MMA8451Q::getAccAllAxis(float * res) {
emilmont 0:6149091f755d 96 res[0] = getAccX();
emilmont 0:6149091f755d 97 res[1] = getAccY();
emilmont 0:6149091f755d 98 res[2] = getAccZ();
emilmont 0:6149091f755d 99 }
emilmont 0:6149091f755d 100
emilmont 0:6149091f755d 101 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
emilmont 0:6149091f755d 102 int16_t acc;
emilmont 0:6149091f755d 103 uint8_t res[2];
samux 1:d2630136d51e 104 readRegs(addr, res, 2);
emilmont 0:6149091f755d 105
emilmont 0:6149091f755d 106 acc = (res[0] << 6) | (res[1] >> 2);
emilmont 0:6149091f755d 107 if (acc > UINT14_MAX/2)
emilmont 0:6149091f755d 108 acc -= UINT14_MAX;
emilmont 0:6149091f755d 109
emilmont 0:6149091f755d 110 return acc;
emilmont 0:6149091f755d 111 }
emilmont 0:6149091f755d 112
samux 1:d2630136d51e 113 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
emilmont 0:6149091f755d 114 char t[1] = {addr};
emilmont 0:6149091f755d 115 m_i2c.write(m_addr, t, 1, true);
emilmont 0:6149091f755d 116 m_i2c.read(m_addr, (char *)data, len);
emilmont 0:6149091f755d 117 }
emilmont 0:6149091f755d 118
samux 1:d2630136d51e 119 void MMA8451Q::writeRegs(uint8_t * data, int len) {
emilmont 0:6149091f755d 120 m_i2c.write(m_addr, (char *)data, len);
emilmont 0:6149091f755d 121 }