cvaccfreefall
Fork of MMA8451Q by
Embed:
(wiki syntax)
Show/hide line numbers
MMA8451Q.cpp
00001 /* Copyright (c) 2010-2011 mbed.org, MIT License 00002 * 00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 00004 * and associated documentation files (the "Software"), to deal in the Software without 00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish, 00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the 00007 * Software is furnished to do so, subject to the following conditions: 00008 * 00009 * The above copyright notice and this permission notice shall be included in all copies or 00010 * substantial portions of the Software. 00011 * 00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 00017 */ 00018 00019 #include "MMA8451Q.h" 00020 00021 #define REG_WHO_AM_I 0x0D 00022 #define REG_CTRL_REG_1 0x2A 00023 #define REG_OUT_X_MSB 0x01 00024 #define REG_OUT_Y_MSB 0x03 00025 #define REG_OUT_Z_MSB 0x05 00026 00027 #define UINT14_MAX 16383 00028 00029 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { 00030 // activate the peripheral 00031 00032 uint8_t data[2] = {REG_CTRL_REG_1, 0x01}; 00033 writeRegs(data, 2); 00034 00035 00036 } 00037 00038 MMA8451Q::~MMA8451Q() { } 00039 00040 uint8_t MMA8451Q::getWhoAmI() { 00041 uint8_t who_am_i = 0; 00042 readRegs(REG_WHO_AM_I, &who_am_i, 1); 00043 return who_am_i; 00044 } 00045 00046 float MMA8451Q::getAccX() { 00047 return (float(getAccAxis(REG_OUT_X_MSB))/4096.0); 00048 } 00049 00050 float MMA8451Q::getAccY() { 00051 return (float(getAccAxis(REG_OUT_Y_MSB))/4096.0); 00052 } 00053 00054 float MMA8451Q::getAccZ() { 00055 return (float(getAccAxis(REG_OUT_Z_MSB))/4096.0); 00056 } 00057 00058 void MMA8451Q::getAccAllAxis(float * res) { 00059 res[0] = getAccX(); 00060 res[1] = getAccY(); 00061 res[2] = getAccZ(); 00062 } 00063 00064 int16_t MMA8451Q::getAccAxis(uint8_t addr) { 00065 int16_t acc; 00066 uint8_t res[2]; 00067 readRegs(addr, res, 2); 00068 00069 acc = (res[0] << 6) | (res[1] >> 2); 00070 if (acc > UINT14_MAX/2) 00071 acc -= UINT14_MAX; 00072 00073 return acc; 00074 } 00075 00076 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) { 00077 char t[1] = {addr}; 00078 m_i2c.write(m_addr, t, 1, true); 00079 m_i2c.read(m_addr, (char *)data, len); 00080 } 00081 00082 void MMA8451Q::writeRegs(uint8_t * data, int len) { 00083 m_i2c.write(m_addr, (char *)data, len); 00084 }
Generated on Tue Jul 19 2022 19:13:47 by 1.7.2