Stanley Cohen / MMA8451Q8a

Modified for getting access to count data

Dependents:   LCD_punch_mtr_8_v5_class LCD_punch_mtr_8_v5_class LCD_punch_mtr_8_v5_class-Rahul-HW3_2 LCD_punch_mtr_8_v5_DE_32HW ... more

Fork of MMA8451Q8_1 by Stanley Cohen

MMA8451Q8b.cpp@8:6a75e7aec482, 2017-02-10 (annotated)

Committer:
scohennm
Date:
Fri Feb 10 19:07:43 2017 +0000
Revision:
8:6a75e7aec482
Parent:
MMA8451Q8.cpp@7:ed7e11d269f8 
Update of punch program using the accelerometer on the KL46Z

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 5:5a7293378401 18 // Modify to change full scale gravity range 141207 sc
scohennm 8:6a75e7aec482 19 /*
scohennm 8:6a75e7aec482 20 * Update getGLimit to map to application note AN4076
scohennm 8:6a75e7aec482 21 * http://cache.freescale.com/files/sensors/doc/app_note/AN4076.pdf
scohennm 8:6a75e7aec482 22 * 02/05/2016 sc
scohennm 8:6a75e7aec482 23 */
scohennm 5:5a7293378401 24
scohennm 8:6a75e7aec482 25 #include "MMA8451Q8b.h"
emilmont 0:6149091f755d 26
samux 1:d2630136d51e 27 #define REG_WHO_AM_I 0x0D
samux 1:d2630136d51e 28 #define REG_CTRL_REG_1 0x2A
emilmont 0:6149091f755d 29 #define REG_OUT_X_MSB 0x01
emilmont 0:6149091f755d 30 #define REG_OUT_Y_MSB 0x03
emilmont 0:6149091f755d 31 #define REG_OUT_Z_MSB 0x05
scohennm 5:5a7293378401 32 #define XYZ_DATA_CFG 0x0E
emilmont 0:6149091f755d 33
samux 1:d2630136d51e 34 #define UINT14_MAX 16383
emilmont 0:6149091f755d 35
scohennm 5:5a7293378401 36 #define MAX_2G 0x00
scohennm 5:5a7293378401 37 #define MAX_4G 0x01
scohennm 5:5a7293378401 38 #define MAX_8G 0x02
scohennm 5:5a7293378401 39
scohennm 5:5a7293378401 40 #define NUM_DATA 2
scohennm 5:5a7293378401 41 #define GSCALING 1024.0
scohennm 5:5a7293378401 42 #define ADDRESS_INDEX 0
scohennm 5:5a7293378401 43 #define DATA_INDEX 1
scohennm 5:5a7293378401 44
scohennm 5:5a7293378401 45 float gScaling[3] = {4095.0,2048.0,1024.0}; //scaling for acceleration of gravity values
scohennm 5:5a7293378401 46
emilmont 0:6149091f755d 47 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
emilmont 0:6149091f755d 48 // activate the peripheral
emilmont 0:6149091f755d 49 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
samux 1:d2630136d51e 50 writeRegs(data, 2);
emilmont 0:6149091f755d 51 }
emilmont 0:6149091f755d 52
emilmont 0:6149091f755d 53 MMA8451Q::~MMA8451Q() { }
emilmont 0:6149091f755d 54
emilmont 0:6149091f755d 55 uint8_t MMA8451Q::getWhoAmI() {
emilmont 0:6149091f755d 56 uint8_t who_am_i = 0;
samux 1:d2630136d51e 57 readRegs(REG_WHO_AM_I, &who_am_i, 1);
emilmont 0:6149091f755d 58 return who_am_i;
emilmont 0:6149091f755d 59 }
scohennm 8:6a75e7aec482 60
scohennm 8:6a75e7aec482 61 void MMA8451Q::setStandbyMode(){
scohennm 8:6a75e7aec482 62 #define ACTIVEMASK 0x01
scohennm 8:6a75e7aec482 63 uint8_t registerData[1];
scohennm 8:6a75e7aec482 64 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
scohennm 8:6a75e7aec482 65
scohennm 8:6a75e7aec482 66 readRegs(REG_CTRL_REG_1, registerData, 1);
scohennm 8:6a75e7aec482 67 data[1] = registerData[0] & ~ACTIVEMASK;
scohennm 8:6a75e7aec482 68 writeRegs(data, NUM_DATA); // put in standby
scohennm 8:6a75e7aec482 69 }
scohennm 8:6a75e7aec482 70 void MMA8451Q::setActiveMode(){
scohennm 8:6a75e7aec482 71 #define ACTIVEMASK 0x01
scohennm 8:6a75e7aec482 72 uint8_t registerData[1];
scohennm 8:6a75e7aec482 73 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
scohennm 8:6a75e7aec482 74
scohennm 8:6a75e7aec482 75 readRegs(REG_CTRL_REG_1, registerData, 1);
scohennm 8:6a75e7aec482 76 data[1] = registerData[0] | ACTIVEMASK;
scohennm 8:6a75e7aec482 77 writeRegs(data, NUM_DATA); // put in standby
scohennm 8:6a75e7aec482 78 }
scohennm 8:6a75e7aec482 79
scohennm 5:5a7293378401 80 void MMA8451Q::setGLimit(int gSelect) {
scohennm 5:5a7293378401 81 uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
scohennm 5:5a7293378401 82 gChosen = gSelect;
scohennm 8:6a75e7aec482 83 setStandbyMode();
scohennm 5:5a7293378401 84 data[ADDRESS_INDEX ] = XYZ_DATA_CFG;
scohennm 5:5a7293378401 85 data[DATA_INDEX] = gChosen;
scohennm 5:5a7293378401 86 writeRegs(data, 2);// change g limit
scohennm 8:6a75e7aec482 87 setActiveMode(); // make active
scohennm 5:5a7293378401 88 }
emilmont 0:6149091f755d 89
chris 3:db7126dbd63f 90 float MMA8451Q::getAccX() {
scohennm 5:5a7293378401 91 return (float(getAccAxis(REG_OUT_X_MSB))/gScaling[gChosen]);
emilmont 0:6149091f755d 92 }
emilmont 0:6149091f755d 93
scohennm 7:ed7e11d269f8 94
chris 3:db7126dbd63f 95 float MMA8451Q::getAccY() {
scohennm 5:5a7293378401 96 return (float(getAccAxis(REG_OUT_Y_MSB))/gScaling[gChosen]);
emilmont 0:6149091f755d 97 }
emilmont 0:6149091f755d 98
chris 3:db7126dbd63f 99 float MMA8451Q::getAccZ() {
scohennm 5:5a7293378401 100 return (float(getAccAxis(REG_OUT_Z_MSB))/gScaling[gChosen]);
emilmont 0:6149091f755d 101 }
emilmont 0:6149091f755d 102
chris 3:db7126dbd63f 103 void MMA8451Q::getAccAllAxis(float * res) {
emilmont 0:6149091f755d 104 res[0] = getAccX();
emilmont 0:6149091f755d 105 res[1] = getAccY();
emilmont 0:6149091f755d 106 res[2] = getAccZ();
emilmont 0:6149091f755d 107 }
emilmont 0:6149091f755d 108
emilmont 0:6149091f755d 109 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
emilmont 0:6149091f755d 110 int16_t acc;
emilmont 0:6149091f755d 111 uint8_t res[2];
samux 1:d2630136d51e 112 readRegs(addr, res, 2);
emilmont 0:6149091f755d 113
emilmont 0:6149091f755d 114 acc = (res[0] << 6) | (res[1] >> 2);
emilmont 0:6149091f755d 115 if (acc > UINT14_MAX/2)
emilmont 0:6149091f755d 116 acc -= UINT14_MAX;
emilmont 0:6149091f755d 117
emilmont 0:6149091f755d 118 return acc;
emilmont 0:6149091f755d 119 }
emilmont 0:6149091f755d 120
samux 1:d2630136d51e 121 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
emilmont 0:6149091f755d 122 char t[1] = {addr};
emilmont 0:6149091f755d 123 m_i2c.write(m_addr, t, 1, true);
emilmont 0:6149091f755d 124 m_i2c.read(m_addr, (char *)data, len);
emilmont 0:6149091f755d 125 }
emilmont 0:6149091f755d 126
samux 1:d2630136d51e 127 void MMA8451Q::writeRegs(uint8_t * data, int len) {
emilmont 0:6149091f755d 128 m_i2c.write(m_addr, (char *)data, len);
emilmont 0:6149091f755d 129 }