File content as of revision 14:646eb94fa2eb:

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#include "bmi160.h"


const struct BMI160::AccConfig BMI160::DEFAULT_ACC_CONFIG = {SENS_2G, ACC_US_OFF, ACC_BWP_2, ACC_ODR_8};
    

//*****************************************************************************
int32_t BMI160::setSensorPowerMode(Sensors sensor, PowerModes pwrMode)
{
    int32_t rtnVal = -1;
    
    switch(sensor)
    {
        case MAG:
            rtnVal = writeRegister(CMD, (MAG_SET_PMU_MODE | pwrMode));
        break;
        
        case GYRO:
            rtnVal = writeRegister(CMD, (GYR_SET_PMU_MODE | pwrMode));
        break;
        
        case ACC:
            rtnVal = writeRegister(CMD, (ACC_SET_PMU_MODE | pwrMode));
        break;
        
        default:
            rtnVal = -1;
        break;
    }
    
    return rtnVal;
}


//*****************************************************************************
int32_t BMI160::setAccConfig(const AccConfig &config)
{
    uint8_t data[2];
    
    data[0] = ((config.us << ACC_US_POS) | (config.bwp << ACC_BWP_POS) | 
               (config.odr << ACC_ODR_POS));
    data[1] = config.range;
    
    return writeBlock(ACC_CONF, ACC_RANGE, data);
}


//*****************************************************************************
int32_t BMI160::getAccConfig(AccConfig &config)
{
    uint8_t data[2];
    int32_t rtnVal = readBlock(ACC_CONF, ACC_RANGE, data);
    
    if(rtnVal == RTN_NO_ERROR)
    {
        config.range = static_cast<BMI160::AccRange>(
        (data[1] & ACC_RANGE_MASK));
        config.us = static_cast<BMI160::AccUnderSampling>(
        ((data[0] & ACC_US_MASK) >> ACC_US_POS));
        config.bwp = static_cast<BMI160::AccBandWidthParam>(
        ((data[0] & ACC_BWP_MASK) >> ACC_BWP_POS));
        config.odr = static_cast<BMI160::AccOutPutDataRate>(
        ((data[0] & ACC_ODR_MASK) >> ACC_ODR_POS));
    }
    
    return rtnVal;
}


//*****************************************************************************
int32_t BMI160::getAccAxis(SensorAxis axis, AxisData &data, AccRange range)
{
    uint8_t localData[2];
    int32_t rtnVal;
    
    switch(axis)
    {
        case X_AXIS:
            rtnVal = readBlock(DATA_14, DATA_15, localData);
        break;
        
        case Y_AXIS:
            rtnVal = readBlock(DATA_16, DATA_17, localData);
        break;
        
        case Z_AXIS:
            rtnVal = readBlock(DATA_18, DATA_19, localData);
        break;
        
        default:
            rtnVal = -1;
        break;
    }
    
    if(rtnVal == RTN_NO_ERROR)
    {
        data.raw = ((localData[1] << 8) | localData[0]);
        switch(range)
        {
            //magic numbers are typical values for LSB/g from EC table
            case SENS_2G:
                data.scaled = (data.raw/16384.0F);
            break;
            
            case SENS_4G:
                data.scaled = (data.raw/8192.0F);
            break;
            
            case SENS_8G:
                data.scaled = (data.raw/4096.0F);
            break;
            
            case SENS_16G:
                data.scaled = (data.raw/2048.0F);
            break;
        }
    }
    
    return rtnVal;
}
    

//*****************************************************************************    
int32_t BMI160::getAccXYZ(SensorData &data, AccRange range)
{
    uint8_t localData[6];
    int32_t rtnVal = readBlock(DATA_14, DATA_19, localData);
    
    if(rtnVal == RTN_NO_ERROR)
    {
        data.xAxis.raw = ((localData[1] << 8) | localData[0]);
        data.yAxis.raw = ((localData[3] << 8) | localData[2]);
        data.zAxis.raw = ((localData[5] << 8) | localData[4]);
        
        switch(range)
        {
            //magic numbers are typical values for LSB/g from EC table
            case SENS_2G:
                data.xAxis.scaled = (data.xAxis.raw/16384.0F);
                data.yAxis.scaled = (data.yAxis.raw/16384.0F);
                data.zAxis.scaled = (data.zAxis.raw/16384.0F);
            break;
            
            case SENS_4G:
                data.xAxis.scaled = (data.xAxis.raw/8192.0F);
                data.yAxis.scaled = (data.yAxis.raw/8192.0F);
                data.zAxis.scaled = (data.zAxis.raw/8192.0F);
            break;
            
            case SENS_8G:
                data.xAxis.scaled = (data.xAxis.raw/4096.0F);
                data.yAxis.scaled = (data.yAxis.raw/4096.0F);
                data.zAxis.scaled = (data.zAxis.raw/4096.0F);
            break;
            
            case SENS_16G:
                data.xAxis.scaled = (data.xAxis.raw/2048.0F);
                data.yAxis.scaled = (data.yAxis.raw/2048.0F);
                data.zAxis.scaled = (data.zAxis.raw/2048.0F);
            break;
        }
    }
    
    return rtnVal;
}


//***************************************************************************** 
int32_t BMI160::getSensorTime(float *data)
{
    uint8_t localData[3];
    int32_t rtnVal = readBlock(SENSORTIME_0, SENSORTIME_2, localData);
    
    if(rtnVal == RTN_NO_ERROR)
    {
        *data = (((localData[2] << 16) | (localData[1] << 8) | localData[0]) * 39e-6);
    }
    
    return rtnVal;
}


//*****************************************************************************
int32_t BMI160::getTemperature(float *temp)
{
    uint8_t data[2];
    uint16_t rawTemp;
    
    int32_t rtnVal = readBlock(TEMPERATURE_0, TEMPERATURE_1, data);
    if(rtnVal == RTN_NO_ERROR)
    {
        rawTemp = ((data[1] << 8) | data[0]);
        if(rawTemp & 0x8000)
        {
            *temp = (23.0F - ((0x10000 - rawTemp)/512.0F));
        }
        else
        {
            *temp = ((rawTemp/512.0F) + 23.0F);
        }
    }
    
    return rtnVal;
}