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_STATUS        0x00
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 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
00028     // activate the peripheral
00029     m_i2c.frequency(375000);
00030     unsigned char t;
00031     t = readReg(REG_CTRL_REG_1);
00032     unsigned char data[2] = {REG_CTRL_REG_1, t|0x01};
00033     writeRegs(data, 2);
00034 }
00035  
00036 uint8_t MMA8451Q::isDataAvailable(void)
00037 {
00038     uint8_t status;
00039     status = readReg( REG_STATUS);
00040     return (status & 0xf);
00041 }
00042 
00043 uint8_t MMA8451Q::readReg(uint8_t addr) {
00044     char t[1] = {addr};
00045     m_i2c.write(m_addr, t, 1, true);
00046     m_i2c.read(m_addr, t, 1);
00047     return t[0];
00048 }
00049 
00050 void MMA8451Q::writeRegs(uint8_t * data, int len) {
00051     m_i2c.write(m_addr, (char *)data, len);
00052 }
00053 
00054 
00055 
00056 
00057