Eli Menchaca / MMA8451Q8

Made the following changes from tumblr post.

Fork of MMA8451Q8 by Stanley Cohen

MMA8451Q8.cpp@8:9a17721c387d, 2017-03-08 (annotated)

Committer:
menchacaeli
Date:
Wed Mar 08 03:21:38 2017 +0000
Revision:
8:9a17721c387d
Parent:
7:7812354ef684 
updated

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
menchacaeli 8:9a17721c387d 36 #define NUM_DATA 2
scohennm 5:be042e8c1756 37 #define GSCALING 1024.0
menchacaeli 8:9a17721c387d 38 #define ADDRESS_INDEX 0
menchacaeli 8:9a17721c387d 39 #define DATA_INDEX 1
menchacaeli 8:9a17721c387d 40
menchacaeli 8:9a17721c387d 41 float gScaling[3] = {4095.0, 2048.0, 1024.0}; // scaling for acceleration of gravity values
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
menchacaeli 8:9a17721c387d 51 void MMA8451Q::setStandbyMode() {
menchacaeli 8:9a17721c387d 52 #define ACTIVEMASK 0x01
menchacaeli 8:9a17721c387d 53 uint8_t registerData[1];
menchacaeli 8:9a17721c387d 54 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
menchacaeli 8:9a17721c387d 55
menchacaeli 8:9a17721c387d 56 readRegs(REG_CTRL_REG_1, registerData, 1);
menchacaeli 8:9a17721c387d 57 data[1] = registerData[0] & ~ACTIVEMASK;
menchacaeli 8:9a17721c387d 58 writeRegs(data, NUM_DATA); // put in stanby
menchacaeli 8:9a17721c387d 59 }
menchacaeli 8:9a17721c387d 60
menchacaeli 8:9a17721c387d 61 void MMA8451Q::setActiveMode() {
menchacaeli 8:9a17721c387d 62 #define ACTIVEMASK 0x01
menchacaeli 8:9a17721c387d 63 uint8_t registerData[1];
menchacaeli 8:9a17721c387d 64 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
menchacaeli 8:9a17721c387d 65
menchacaeli 8:9a17721c387d 66 readRegs(REG_CTRL_REG_1, registerData, 1);
menchacaeli 8:9a17721c387d 67 data[1] = registerData[0] | ACTIVEMASK;
menchacaeli 8:9a17721c387d 68 writeRegs(data, NUM_DATA); //put in standby
menchacaeli 8:9a17721c387d 69 }
menchacaeli 8:9a17721c387d 70
menchacaeli 8:9a17721c387d 71 void MMA8451Q::setGLimit(int gSelect) {
menchacaeli 8:9a17721c387d 72 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
menchacaeli 8:9a17721c387d 73 gChosen = gSelect;
menchacaeli 8:9a17721c387d 74 setStandbyMode();
menchacaeli 8:9a17721c387d 75 data[ADDRESS_INDEX ] = XYZ_DATA_CFG;
menchacaeli 8:9a17721c387d 76 data[DATA_INDEX] = gChosen;
menchacaeli 8:9a17721c387d 77 writeRegs(data, 2); // change g limit
menchacaeli 8:9a17721c387d 78 setActiveMode(); // make active
menchacaeli 8:9a17721c387d 79 }
emilmont 0:6149091f755d 80 uint8_t MMA8451Q::getWhoAmI() {
emilmont 0:6149091f755d 81 uint8_t who_am_i = 0;
samux 1:d2630136d51e 82 readRegs(REG_WHO_AM_I, &who_am_i, 1);
emilmont 0:6149091f755d 83 return who_am_i;
emilmont 0:6149091f755d 84 }
menchacaeli 8:9a17721c387d 85 //void MMA8451Q::setGLimit(int) {
menchacaeli 8:9a17721c387d 86 // uint8_t data[2] = {REG_CTRL_REG_1, 0x00};
menchacaeli 8:9a17721c387d 87 // writeRegs(data, 2); // put in standby
menchacaeli 8:9a17721c387d 88 // data[0] = XYZ_DATA_CFG;
menchacaeli 8:9a17721c387d 89 // data[1] = MAX_8G;
menchacaeli 8:9a17721c387d 90 // writeRegs(data, 2);// change g limit
menchacaeli 8:9a17721c387d 91 // data[0] = REG_CTRL_REG_1;
menchacaeli 8:9a17721c387d 92 // data[1] = 0x01;
menchacaeli 8:9a17721c387d 93 // writeRegs(data, 2); // make active
menchacaeli 8:9a17721c387d 94 //}
emilmont 0:6149091f755d 95
chris 3:db7126dbd63f 96 float MMA8451Q::getAccX() {
scohennm 5:be042e8c1756 97 return (float(getAccAxis(REG_OUT_X_MSB))/GSCALING);
emilmont 0:6149091f755d 98 }
emilmont 0:6149091f755d 99
chris 3:db7126dbd63f 100 float MMA8451Q::getAccY() {
scohennm 5:be042e8c1756 101 return (float(getAccAxis(REG_OUT_Y_MSB))/GSCALING);
emilmont 0:6149091f755d 102 }
emilmont 0:6149091f755d 103
chris 3:db7126dbd63f 104 float MMA8451Q::getAccZ() {
scohennm 5:be042e8c1756 105 return (float(getAccAxis(REG_OUT_Z_MSB))/GSCALING);
emilmont 0:6149091f755d 106 }
emilmont 0:6149091f755d 107
chris 3:db7126dbd63f 108 void MMA8451Q::getAccAllAxis(float * res) {
emilmont 0:6149091f755d 109 res[0] = getAccX();
emilmont 0:6149091f755d 110 res[1] = getAccY();
emilmont 0:6149091f755d 111 res[2] = getAccZ();
emilmont 0:6149091f755d 112 }
emilmont 0:6149091f755d 113
emilmont 0:6149091f755d 114 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
emilmont 0:6149091f755d 115 int16_t acc;
emilmont 0:6149091f755d 116 uint8_t res[2];
samux 1:d2630136d51e 117 readRegs(addr, res, 2);
emilmont 0:6149091f755d 118
emilmont 0:6149091f755d 119 acc = (res[0] << 6) | (res[1] >> 2);
emilmont 0:6149091f755d 120 if (acc > UINT14_MAX/2)
emilmont 0:6149091f755d 121 acc -= UINT14_MAX;
emilmont 0:6149091f755d 122
emilmont 0:6149091f755d 123 return acc;
emilmont 0:6149091f755d 124 }
emilmont 0:6149091f755d 125
samux 1:d2630136d51e 126 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
emilmont 0:6149091f755d 127 char t[1] = {addr};
emilmont 0:6149091f755d 128 m_i2c.write(m_addr, t, 1, true);
emilmont 0:6149091f755d 129 m_i2c.read(m_addr, (char *)data, len);
emilmont 0:6149091f755d 130 }
emilmont 0:6149091f755d 131
samux 1:d2630136d51e 132 void MMA8451Q::writeRegs(uint8_t * data, int len) {
emilmont 0:6149091f755d 133 m_i2c.write(m_addr, (char *)data, len);
emilmont 0:6149091f755d 134 }