BM1383GLV.cpp

00001 /* Copyright (c) 2015 ARM Ltd., 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 *  BM1383GLV Pressure sensor library
00020 *
00021 *  @author  Toyomasa Watarai
00022 *  @version 1.0
00023 *  @date    30-December-2015
00024 *
00025 *  Library for "BM1383GLV Pressure sensor library"
00026 *    http://www.rohm.com/web/eu/news-detail?news-title=2014-12-11_ad_pressure&defaultGroupId=false
00027 *
00028 */
00029 
00030 #include "mbed.h"
00031 #include "BM1383GLV.h"
00032 
00033 BM1383GLV::BM1383GLV(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr)
00034 {
00035     initialize();
00036 }
00037 
00038 BM1383GLV::BM1383GLV(I2C &i2c_obj, int addr) : m_i2c(i2c_obj), m_addr(addr)
00039 {
00040     initialize();
00041 }
00042 
00043 BM1383GLV::~BM1383GLV()
00044 {
00045 }
00046 
00047 void BM1383GLV::initialize()
00048 {
00049     unsigned char buf;
00050     unsigned char reg[2];
00051 
00052     readRegs(BM1383GLV_ID, &buf, sizeof(buf));
00053     if (buf != BM1383GLV_ID_VAL) {
00054         DEBUG_PRINT("BM1383GLV initialization error. (%d)\n", buf);
00055         return;
00056     }
00057 
00058     reg[0] = BM1383GLV_POWER_DOWN;
00059     reg[1] = 0x01;
00060     writeRegs(reg, 2);
00061     
00062     wait(1);
00063 
00064     reg[0] = BM1383GLV_SLEEP;
00065     reg[1] = 0x01;
00066     writeRegs(reg, 2);
00067 
00068     reg[0] = BM1383GLV_MODE_CONTROL;
00069     reg[1] = 0xC4;
00070     writeRegs(reg, 2);
00071 }
00072 
00073 float BM1383GLV::getPressure()
00074 {
00075     uint32_t rawPressure;
00076 
00077     readRegs(BM1383GLV_PRESSURE_MSB, m_buf, 3);
00078     rawPressure = (((uint32_t)m_buf[0] << 16) | ((uint32_t)m_buf[1] << 8) | m_buf[2]&0xFC) >> 2;
00079     return (float)rawPressure / (2048);
00080 }
00081 
00082 float BM1383GLV::getTemperature()
00083 {
00084     int32_t rawTemerature;
00085     
00086     readRegs(BM1383GLV_TEMPERATURE_MSB, m_buf, 2);
00087     rawTemerature = ((int32_t)m_buf[0] << 8) | (m_buf[1]);
00088     return (float)rawTemerature / 32;
00089 }
00090 
00091 void BM1383GLV::readRegs(int addr, uint8_t * data, int len)
00092 {
00093     char t[1] = {addr};
00094     m_i2c.write(m_addr, t, 1, true);
00095     m_i2c.read(m_addr, (char *)data, len);
00096 }
00097 
00098 void BM1383GLV::writeRegs(uint8_t * data, int len)
00099 {
00100     m_i2c.write(m_addr, (char *)data, len);
00101 }