Kenneth Lujan / MMA8451Q

HW

Fork of MMA8451Q by Emilio Monti

MMA8451Q.cpp@5:df36b750371a, 2017-02-22 (annotated)

Committer:
kennylujan42
Date:
Wed Feb 22 09:49:41 2017 +0000
Revision:
5:df36b750371a
Parent:
3:db7126dbd63f 
HW

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 */
samux 1:d2630136d51e 18
kennylujan42 5:df36b750371a 19
kennylujan42 5:df36b750371a 20
emilmont 0:6149091f755d 21 #include "MMA8451Q.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
kennylujan42 5:df36b750371a 28 #define XYZ_DATA_CFG 0x0E
emilmont 0:6149091f755d 29
samux 1:d2630136d51e 30 #define UINT14_MAX 16383
emilmont 0:6149091f755d 31
kennylujan42 5:df36b750371a 32 #define MAX_2G 0x00
kennylujan42 5:df36b750371a 33 #define MAX_4G 0x01
kennylujan42 5:df36b750371a 34 #define MAX_8G 0x10
kennylujan42 5:df36b750371a 35
kennylujan42 5:df36b750371a 36 #define GSCALING 1024.0
kennylujan42 5:df36b750371a 37
emilmont 0:6149091f755d 38 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
emilmont 0:6149091f755d 39 // activate the peripheral
emilmont 0:6149091f755d 40 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
samux 1:d2630136d51e 41 writeRegs(data, 2);
emilmont 0:6149091f755d 42 }
emilmont 0:6149091f755d 43
emilmont 0:6149091f755d 44 MMA8451Q::~MMA8451Q() { }
emilmont 0:6149091f755d 45
emilmont 0:6149091f755d 46 uint8_t MMA8451Q::getWhoAmI() {
emilmont 0:6149091f755d 47 uint8_t who_am_i = 0;
samux 1:d2630136d51e 48 readRegs(REG_WHO_AM_I, &who_am_i, 1);
emilmont 0:6149091f755d 49 return who_am_i;
emilmont 0:6149091f755d 50 }
emilmont 0:6149091f755d 51
kennylujan42 5:df36b750371a 52
chris 3:db7126dbd63f 53 float MMA8451Q::getAccX() {
chris 3:db7126dbd63f 54 return (float(getAccAxis(REG_OUT_X_MSB))/4096.0);
emilmont 0:6149091f755d 55 }
emilmont 0:6149091f755d 56
chris 3:db7126dbd63f 57 float MMA8451Q::getAccY() {
chris 3:db7126dbd63f 58 return (float(getAccAxis(REG_OUT_Y_MSB))/4096.0);
emilmont 0:6149091f755d 59 }
emilmont 0:6149091f755d 60
chris 3:db7126dbd63f 61 float MMA8451Q::getAccZ() {
chris 3:db7126dbd63f 62 return (float(getAccAxis(REG_OUT_Z_MSB))/4096.0);
emilmont 0:6149091f755d 63 }
emilmont 0:6149091f755d 64
chris 3:db7126dbd63f 65 void MMA8451Q::getAccAllAxis(float * res) {
emilmont 0:6149091f755d 66 res[0] = getAccX();
emilmont 0:6149091f755d 67 res[1] = getAccY();
emilmont 0:6149091f755d 68 res[2] = getAccZ();
emilmont 0:6149091f755d 69 }
emilmont 0:6149091f755d 70
emilmont 0:6149091f755d 71 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
emilmont 0:6149091f755d 72 int16_t acc;
emilmont 0:6149091f755d 73 uint8_t res[2];
samux 1:d2630136d51e 74 readRegs(addr, res, 2);
emilmont 0:6149091f755d 75
emilmont 0:6149091f755d 76 acc = (res[0] << 6) | (res[1] >> 2);
emilmont 0:6149091f755d 77 if (acc > UINT14_MAX/2)
emilmont 0:6149091f755d 78 acc -= UINT14_MAX;
emilmont 0:6149091f755d 79
emilmont 0:6149091f755d 80 return acc;
emilmont 0:6149091f755d 81 }
emilmont 0:6149091f755d 82
samux 1:d2630136d51e 83 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
emilmont 0:6149091f755d 84 char t[1] = {addr};
emilmont 0:6149091f755d 85 m_i2c.write(m_addr, t, 1, true);
emilmont 0:6149091f755d 86 m_i2c.read(m_addr, (char *)data, len);
emilmont 0:6149091f755d 87 }
emilmont 0:6149091f755d 88
samux 1:d2630136d51e 89 void MMA8451Q::writeRegs(uint8_t * data, int len) {
emilmont 0:6149091f755d 90 m_i2c.write(m_addr, (char *)data, len);
emilmont 0:6149091f755d 91 }
kennylujan42 5:df36b750371a 92 void MMA8451Q::setGLimit() {
kennylujan42 5:df36b750371a 93 uint8_t data[2] = {REG_CTRL_REG_1, 0x00};
kennylujan42 5:df36b750371a 94 writeRegs(data, 2);
kennylujan42 5:df36b750371a 95 data[0] = XYZ_DATA_CFG;
kennylujan42 5:df36b750371a 96 data[1] = 0x02;
kennylujan42 5:df36b750371a 97 writeRegs(data, 2);
kennylujan42 5:df36b750371a 98 data[0] = REG_CTRL_REG_1;
kennylujan42 5:df36b750371a 99 data[1] = 0x01;
kennylujan42 5:df36b750371a 100 writeRegs(data, 2);
kennylujan42 5:df36b750371a 101 }