I2C Accelerometer library
Dependents: FRDMSTBC-A8491_SensorShield xtrinsic_sensors 1-FRDM-Gimbal-LAB
MMA8491.cpp
- Committer:
- AswinSivakumar
- Date:
- 2017-04-24
- Revision:
- 1:ce9ae6fa9407
- Parent:
- 0:4f7ab3a47e7b
File content as of revision 1:ce9ae6fa9407:
/* * Copyright (c) 2015 - 2016, Freescale Semiconductor, Inc. * Copyright 2016-2017 NXP * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * o Redistributions of source code must retain the above copyright notice, this list * of conditions and the following disclaimer. * * o Redistributions in binary form must reproduce the above copyright notice, this * list of conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. * * o Neither the name of the copyright holder nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "MMA8491.h" #include "mbed.h" MMA8491::MMA8491(PinName sda, PinName scl, PinName en) : MMA8491_i2c(sda,scl),MMA8491_en(en) { MMA8491_en=0; } void MMA8491::acquire_MMA8491_data_g(float * a_data) { char data_bytes[7]; char d[1]; MMA8491_en=1; wait(0.001); d[0]=MMA8491_STATUS; MMA8491_i2c.write(MMA8491_I2C_ADDRESS,d,1,true); MMA8491_i2c.read(MMA8491_I2C_ADDRESS,data_bytes,7);// Read the 6 data bytes - LSB and MSB for X, Y and Z Axes. MMA8491_en=0; // a_data[0]= ((float)((int16_t)data_bytes[1])); a_data[0] = ((float)((int16_t)(((data_bytes[1]*256) + (data_bytes[2])))>> 2) * 0.0009765); a_data[1] = ((float)((int16_t)(((data_bytes[3]*256) + (data_bytes[4])))>> 2) * 0.0009765); a_data[2] = ((float)((int16_t)(((data_bytes[5]*256) + (data_bytes[6])))>> 2) * 0.0009765); }