Maxim nexpaq / nexpaq_dev

Preliminary main mbed library for nexpaq development

libraries/tests/peripherals/MMA8451Q/MMA8451Q.cpp@1:d96dbedaebdb, 2016-11-04 (annotated)

Committer:
nexpaq
Date:
Fri Nov 04 20:54:50 2016 +0000
Revision:
1:d96dbedaebdb
Parent:
0:6c56fb4bc5f0 
Removed extra directories for other platforms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 0:6c56fb4bc5f0 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
nexpaq 0:6c56fb4bc5f0 2 *
nexpaq 0:6c56fb4bc5f0 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
nexpaq 0:6c56fb4bc5f0 4 * and associated documentation files (the "Software"), to deal in the Software without
nexpaq 0:6c56fb4bc5f0 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
nexpaq 0:6c56fb4bc5f0 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
nexpaq 0:6c56fb4bc5f0 7 * Software is furnished to do so, subject to the following conditions:
nexpaq 0:6c56fb4bc5f0 8 *
nexpaq 0:6c56fb4bc5f0 9 * The above copyright notice and this permission notice shall be included in all copies or
nexpaq 0:6c56fb4bc5f0 10 * substantial portions of the Software.
nexpaq 0:6c56fb4bc5f0 11 *
nexpaq 0:6c56fb4bc5f0 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
nexpaq 0:6c56fb4bc5f0 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
nexpaq 0:6c56fb4bc5f0 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
nexpaq 0:6c56fb4bc5f0 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
nexpaq 0:6c56fb4bc5f0 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
nexpaq 0:6c56fb4bc5f0 17 */
nexpaq 0:6c56fb4bc5f0 18
nexpaq 0:6c56fb4bc5f0 19 #include "MMA8451Q.h"
nexpaq 0:6c56fb4bc5f0 20
nexpaq 0:6c56fb4bc5f0 21 #define REG_WHO_AM_I 0x0D
nexpaq 0:6c56fb4bc5f0 22 #define REG_CTRL_REG_1 0x2A
nexpaq 0:6c56fb4bc5f0 23 #define REG_OUT_X_MSB 0x01
nexpaq 0:6c56fb4bc5f0 24 #define REG_OUT_Y_MSB 0x03
nexpaq 0:6c56fb4bc5f0 25 #define REG_OUT_Z_MSB 0x05
nexpaq 0:6c56fb4bc5f0 26
nexpaq 0:6c56fb4bc5f0 27 #define UINT14_MAX 16383
nexpaq 0:6c56fb4bc5f0 28
nexpaq 0:6c56fb4bc5f0 29 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
nexpaq 0:6c56fb4bc5f0 30 // activate the peripheral
nexpaq 0:6c56fb4bc5f0 31 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
nexpaq 0:6c56fb4bc5f0 32 writeRegs(data, 2);
nexpaq 0:6c56fb4bc5f0 33 }
nexpaq 0:6c56fb4bc5f0 34
nexpaq 0:6c56fb4bc5f0 35 MMA8451Q::~MMA8451Q() { }
nexpaq 0:6c56fb4bc5f0 36
nexpaq 0:6c56fb4bc5f0 37 uint8_t MMA8451Q::getWhoAmI() {
nexpaq 0:6c56fb4bc5f0 38 uint8_t who_am_i = 0;
nexpaq 0:6c56fb4bc5f0 39 readRegs(REG_WHO_AM_I, &who_am_i, 1);
nexpaq 0:6c56fb4bc5f0 40 return who_am_i;
nexpaq 0:6c56fb4bc5f0 41 }
nexpaq 0:6c56fb4bc5f0 42
nexpaq 0:6c56fb4bc5f0 43 int16_t MMA8451Q::getAccX() {
nexpaq 0:6c56fb4bc5f0 44 return getAccAxis(REG_OUT_X_MSB);
nexpaq 0:6c56fb4bc5f0 45 }
nexpaq 0:6c56fb4bc5f0 46
nexpaq 0:6c56fb4bc5f0 47 int16_t MMA8451Q::getAccY() {
nexpaq 0:6c56fb4bc5f0 48 return getAccAxis(REG_OUT_Y_MSB);
nexpaq 0:6c56fb4bc5f0 49 }
nexpaq 0:6c56fb4bc5f0 50
nexpaq 0:6c56fb4bc5f0 51 int16_t MMA8451Q::getAccZ() {
nexpaq 0:6c56fb4bc5f0 52 return getAccAxis(REG_OUT_Z_MSB);
nexpaq 0:6c56fb4bc5f0 53 }
nexpaq 0:6c56fb4bc5f0 54
nexpaq 0:6c56fb4bc5f0 55 void MMA8451Q::getAccAllAxis(int16_t * res) {
nexpaq 0:6c56fb4bc5f0 56 res[0] = getAccX();
nexpaq 0:6c56fb4bc5f0 57 res[1] = getAccY();
nexpaq 0:6c56fb4bc5f0 58 res[2] = getAccZ();
nexpaq 0:6c56fb4bc5f0 59 }
nexpaq 0:6c56fb4bc5f0 60
nexpaq 0:6c56fb4bc5f0 61 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
nexpaq 0:6c56fb4bc5f0 62 int16_t acc;
nexpaq 0:6c56fb4bc5f0 63 uint8_t res[2];
nexpaq 0:6c56fb4bc5f0 64 readRegs(addr, res, 2);
nexpaq 0:6c56fb4bc5f0 65
nexpaq 0:6c56fb4bc5f0 66 acc = (res[0] << 6) | (res[1] >> 2);
nexpaq 0:6c56fb4bc5f0 67 if (acc > UINT14_MAX/2)
nexpaq 0:6c56fb4bc5f0 68 acc -= UINT14_MAX;
nexpaq 0:6c56fb4bc5f0 69
nexpaq 0:6c56fb4bc5f0 70 return acc;
nexpaq 0:6c56fb4bc5f0 71 }
nexpaq 0:6c56fb4bc5f0 72
nexpaq 0:6c56fb4bc5f0 73 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
nexpaq 0:6c56fb4bc5f0 74 char t[1] = {addr};
nexpaq 0:6c56fb4bc5f0 75 m_i2c.write(m_addr, t, 1, true);
nexpaq 0:6c56fb4bc5f0 76 m_i2c.read(m_addr, (char *)data, len);
nexpaq 0:6c56fb4bc5f0 77 }
nexpaq 0:6c56fb4bc5f0 78
nexpaq 0:6c56fb4bc5f0 79 void MMA8451Q::writeRegs(uint8_t * data, int len) {
nexpaq 0:6c56fb4bc5f0 80 m_i2c.write(m_addr, (char *)data, len);
nexpaq 0:6c56fb4bc5f0 81 }