BM1383AGLV sensor library

Dependents:   simple-sensor-client rohm-SensorShield-example

BM1383AGLV.cpp

Committer:
MACRUM
Date:
2 months ago
Revision:
1:997a1eb76a4f
Parent:
0:d505f3c67a62

File content as of revision 1:997a1eb76a4f:

/* Copyright (c) 2015 ARM Ltd., MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*
*  BM1383AGLV Pressure sensor library
*
*  @author  Toyomasa Watarai
*  @version 1.0
*  @date    30-December-2015
*
*  Library for "BM1383AGLV Pressure sensor library"
*    http://www.rohm.com/web/eu/news-detail?news-title=2014-12-11_ad_pressure&defaultGroupId=false
*
*/

#include "mbed.h"
#include "BM1383AGLV.h"

BM1383AGLV::BM1383AGLV(PinName sda, PinName scl, int addr)
    :
    i2c_p(new I2C(sda, scl)), 
    i2c(*i2c_p),
    m_addr(addr)
{
    initialize();
}

BM1383AGLV::BM1383AGLV(I2C &i2c_obj, int addr)
    :
    i2c_p(NULL), 
    i2c(i2c_obj),
    m_addr(addr)
{
    initialize();
}

BM1383AGLV::~BM1383AGLV()
{
    if (NULL != i2c_p)
        delete  i2c_p;
}

void BM1383AGLV::initialize()
{
    unsigned char buf1, buf2;
    unsigned char reg[2];

    readRegs(BM1383AGLV_ID1, &buf1, sizeof(buf1));
    readRegs(BM1383AGLV_ID2, &buf2, sizeof(buf2));
    if ((buf1 != BM1383AGLV_ID1_VAL) || (buf2 != BM1383AGLV_ID2_VAL)) {
        DEBUG_PRINT("BM1383AGLV initialization error. (%d, %d)\n", buf1, buf2);
        return;
    }

    reg[0] = BM1383AGLV_POWER_DOWN;
    reg[1] = 0x01;
    writeRegs(reg, 2);
    
    wait(1);

    reg[0] = BM1383AGLV_RESET;
    reg[1] = 0x01;
    writeRegs(reg, 2);

    reg[0] = BM1383AGLV_MODE_CONTROL;
    reg[1] = 0xC2;  // x32, continuous measurement
    writeRegs(reg, 2);
}

float BM1383AGLV::getPressure()
{
    uint32_t rawPressure;

#if BM1383AGLV_WAIT_READY_STATUS
    uint8_t ready_status = 0;
    do {
        wait_ms(6);
        readRegs(BM1383AGLV_STATUS, &ready_status, 1);
    } while(ready_status == 0);
#else
    wait_ms(6);
#endif
    readRegs(BM1383AGLV_PRESSURE_MSB, m_buf, 3);
    rawPressure = (((uint32_t)m_buf[0] << 16) | ((uint32_t)m_buf[1] << 8) | m_buf[2]&0xFC) >> 2;
    return (float)rawPressure / (2048);
}

float BM1383AGLV::getTemperature()
{
    int32_t rawTemerature;
    
#if BM1383AGLV_WAIT_READY_STATUS
    uint8_t ready_status = 0;
    do {
        wait_ms(6);
        readRegs(BM1383AGLV_STATUS, &ready_status, 1);
    } while(ready_status == 0);
#else
    wait_ms(6);
#endif
    readRegs(BM1383AGLV_TEMPERATURE_MSB, m_buf, 2);
    rawTemerature = ((int32_t)m_buf[0] << 8) | (m_buf[1]);
    return (float)rawTemerature / 32;
}

void BM1383AGLV::readRegs(int addr, uint8_t * data, int len)
{
    char t[1] = {addr};
    i2c.write(m_addr, t, 1, true);
    i2c.read(m_addr, (char *)data, len);
}

void BM1383AGLV::writeRegs(uint8_t * data, int len)
{
    i2c.write(m_addr, (char *)data, len);
}