ATY_LIB/BMP280_ATY.c

/**
* @file BMP280_ATY.c
*
* @param Project DEVICE_GENERAL_ATY_LIB
*
* @author ATY
*
* @copyright
*       - Copyright 2017 - 2023 MZ-ATY
*       - This code follows:
*           - MZ-ATY Various Contents Joint Statement -
*               <a href="https://mengze.top/MZ-ATY_VCJS">
*                        https://mengze.top/MZ-ATY_VCJS</a>
*           - CC 4.0 BY-NC-SA -
*               <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/">
*                        https://creativecommons.org/licenses/by-nc-sa/4.0/</a>
*       - Your use will be deemed to have accepted the terms of this statement.
*
* @brief Familiar functions of BMP280 for all embedded device
*
* @version
*       - 1_01_220804 > ATY
*           -# Preliminary version, first Release
********************************************************************************
*/

#ifndef __BMP280_ATY_C
#define __BMP280_ATY_C

#include "BMP280_ATY.h"

/******************************* For user *************************************/

/******************************************************************************/

/**
 * @brief   BMP280 read id
 * @return  id number like 0x58, 0x88
 */
uint8_t BMP280_ReadId(void)
{
    uint8_t temp_uint8;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_CHIPID_REG, &temp_uint8, 1);
    return temp_uint8;

}

/**
 * @brief   BMP280 get status
 * @param   status_flag the bit to get
 * @return  1 or 0 at bit status_flag
 */
uint8_t BMP280_GetStatus(uint8_t status_flag)
{
    uint8_t flag;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_STATUS_REG, &flag, 1);
    // status_flag = BMP280_MEASURING || BMP280_IM_UPDATE
    // if(flag & status_flag) return 1;
    // else return 0;
    return flag & status_flag;
}

/**
 * @brief   BMP280 set oversamp
 * @param   config Oversample_Mode value
 */
void BMP280_SetOversamp(BMP280_OVERSAMPLE_MODE* config)
{
    uint8_t temp_uint8;
    temp_uint8 = ((config->T_Osample) << 5) |
        ((config->P_Osample) << 2) |
        ((config)->WORKMODE);

    I2C_WriteReg(BMP280_ADDRESS, BMP280_CTRLMEAS_REG, &temp_uint8, 1);
}

/**
 * @brief   BMP280 set standby filter
 * @param   config bmp280 config
 */
void BMP280_SetStandbyFilter(BMP280_CONFIG* config)
{
    uint8_t temp_uint8;
    temp_uint8 = ((config->T_SB) << 5) |
        ((config->FILTER_COEFFICIENT) << 2) |
        ((config->SPI_EN));

    I2C_WriteReg(BMP280_ADDRESS, BMP280_CONFIG_REG, &temp_uint8, 1);
}


BMP280_S32_t t_fine;    // Use to calc compensation
#ifdef BMP280_USE_FIXED_POINT_COMPENSATE
/**
 * @brief   BMP280 calculate temperature compensate for signed 32
 * @param   adc_T temperature adc origin data
 * @return  signed 32 value of temperature
 * @note    Returns temperature in DegC, resolution is 0.01 DegC. Output value of "5123" equals 51.23 DegC.
 *          t_fine carries fine temperature as global value
 */
BMP280_S32_t BM280_CompensateT(BMP280_S32_t adc_T)
{
    BMP280_S32_t var1, var2, T;
    var1 = ((((adc_T >> 3) - ((BMP280_S32_t)bmp280Cc.T1 << 1))) * ((BMP280_S32_t)bmp280Cc.T2)) >> 11;
    var2 = (((((adc_T >> 4) - ((BMP280_S32_t)bmp280Cc.T1)) * ((adc_T >> 4) - ((BMP280_S32_t)bmp280Cc.T1))) >> 12) *
        ((BMP280_S32_t)bmp280Cc.T3)) >> 14;
    t_fine = var1 + var2;
    T = (t_fine * 5 + 128) >> 8;
    return T;
}

/**
 * @brief   BMP280 calculate pressure compensate for unsigned 32
 * @param   adc_P pressure adc origin data
 * @return  unsigned 32 value of pressure
 * @note    Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24 integer bits and 8 fractional bits).
 *          Output value of "24674867" represents 24674867/256 = 96386.2 Pa = 963.862 hPa
 */
BMP280_U32_t BM280_CompensateP(BMP280_S32_t adc_P)
{
    BMP280_S64_t var1, var2, p;
    var1 = ((BMP280_S64_t)t_fine) - 128000;
    var2 = var1 * var1 * (BMP280_S64_t)bmp280Cc.P6;
    var2 = var2 + ((var1 * (BMP280_S64_t)bmp280Cc.P5) << 17);
    var2 = var2 + (((BMP280_S64_t)bmp280Cc.P4) << 35);
    var1 = ((var1 * var1 * (BMP280_S64_t)bmp280Cc.P3) >> 8) + ((var1 * (BMP280_S64_t)bmp280Cc.P2) << 12);
    var1 = (((((BMP280_S64_t)1) << 47) + var1)) * ((BMP280_S64_t)bmp280Cc.P1) >> 33;
    if(var1 == 0)
    {
        return 0; // avoid exception caused by division by zero
    }
    p = 1048576 - adc_P;
    p = (((p << 31) - var2) * 3125) / var1;
    var1 = (((BMP280_S64_t)bmp280Cc.P9) * (p >> 13) * (p >> 13)) >> 25;
    var2 = (((BMP280_S64_t)bmp280Cc.P8) * p) >> 19;
    p = ((p + var1 + var2) >> 8) + (((BMP280_S64_t)bmp280Cc.P7) << 4);
    return (BMP280_U32_t)p;
}

/**
 * @brief   BMP280 get temperature
 * @return  temperature real value in int32
 */
BMP280_S32_t BMP280_GetTemperature(void)
{
    uint8_t xlsb, lsb, msb;
    long signed bit32;
    BMP280_S32_t temperature;

    I2C_ReadReg(BMP280_ADDRESS, BMP280_TEMPERATURE_XLSB_REG, &xlsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_TEMPERATURE_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_TEMPERATURE_MSB_REG, &msb, 1);
    // The value of a register forming a floating point number
    bit32 = ((long)(msb << 12)) | ((long)(lsb << 4)) | (xlsb >> 4);
    temperature = BM280_CompensateT(bit32);

    return temperature;
}

/**
 * @brief   BMP280 get pressure
 * @return  pressure real value in uint32
 */
BMP280_U32_t BMP280_GetPressure(void)
{
    uint8_t xlsb, lsb, msb;
    long signed bit32;
    BMP280_U32_t pressure;

    I2C_ReadReg(BMP280_ADDRESS, BMP280_PRESSURE_XLSB_REG, &xlsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_PRESSURE_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_PRESSURE_MSB_REG, &msb, 1);
    // The value of a register forming a floating point number
    bit32 = ((long)(msb << 12)) | ((long)(lsb << 4)) | (xlsb >> 4);
    pressure = BM280_CompensateP(bit32);

    return pressure;
}

#else
/**
 * @brief   BMP280 calculate temperature compensate for double
 * @param   adc_T temperature adc origin data
 * @return  double value of temperature
 * @note    Returns temperature in DegC, double precision. Output value of "51.23" equals 51.23 DegC.
 *          t_fine carries fine temperature as global value
 */
double BM280_CompensateT(BMP280_S32_t adc_T)
{
    double var1, var2, T;
    var1 = (((double)adc_T) / 16384.0 - ((double)bmp280Cc.T1) / 1024.0) * ((double)bmp280Cc.T2);
    var2 = ((((double)adc_T) / 131072.0 - ((double)bmp280Cc.T1) / 8192.0) *
        (((double)adc_T) / 131072.0 - ((double)bmp280Cc.T1) / 8192.0)) * ((double)bmp280Cc.T3);
    t_fine = (BMP280_S32_t)(var1 + var2);
    T = (var1 + var2) / 5120.0;
    return T;
}

/**
 * @brief   BMP280 calculate pressure compensate for double
 * @param   adc_P pressure adc origin data
 * @return  double value of pressure
 * @note    Returns pressure in Pa as double. Output value of "96386.2" equals 96386.2 Pa = 963.862 hPa
 */
double BM280_CompensateP(BMP280_S32_t adc_P)
{
    double var1, var2, p;
    var1 = ((double)t_fine / 2.0) - 64000.0;
    var2 = var1 * var1 * ((double)bmp280Cc.P6) / 32768.0;
    var2 = var2 + var1 * ((double)bmp280Cc.P5) * 2.0;
    var2 = (var2 / 4.0) + (((double)bmp280Cc.P4) * 65536.0);
    var1 = (((double)bmp280Cc.P3) * var1 * var1 / 524288.0 + ((double)bmp280Cc.P2) * var1) / 524288.0;
    var1 = (1.0 + var1 / 32768.0) * ((double)bmp280Cc.P1);
    if(var1 == 0.0)
    {
        return 0; // avoid exception caused by division by zero
    }
    p = 1048576.0 - (double)adc_P;
    p = (p - (var2 / 4096.0)) * 6250.0 / var1;
    var1 = ((double)bmp280Cc.P9) * p * p / 2147483648.0;
    var2 = p * ((double)bmp280Cc.P8) / 32768.0;
    p = p + (var1 + var2 + ((double)bmp280Cc.P7)) / 16.0;
    return p;
}

/**
 * @brief   BMP280 get temperature
 * @return  temperature real value in double
 */
double BMP280_GetTemperature(void)
{
    uint8_t xlsb, lsb, msb;
    long signed bit32;
    double temperature;

    I2C_ReadReg(BMP280_ADDRESS, BMP280_TEMPERATURE_XLSB_REG, &xlsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_TEMPERATURE_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_TEMPERATURE_MSB_REG, &msb, 1);
    // The value of a register forming a floating point number
    bit32 = ((long)(msb << 12)) | ((long)(lsb << 4)) | (xlsb >> 4);
    temperature = BM280_CompensateT(bit32);

    return temperature;
}

/**
 * @brief   BMP280 get pressure
 * @return  pressure real value in double
 */
double BMP280_GetPressure(void)
{
    uint8_t xlsb, lsb, msb;
    long signed bit32;
    double pressure;

    I2C_ReadReg(BMP280_ADDRESS, BMP280_PRESSURE_XLSB_REG, &xlsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_PRESSURE_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_PRESSURE_MSB_REG, &msb, 1);
    // The value of a register forming a floating point number
    bit32 = ((long)(msb << 12)) | ((long)(lsb << 4)) | (xlsb >> 4);
    pressure = BM280_CompensateP(bit32);

    return pressure;
}
#endif



struct _BMP280_CC bmp280Cc = {0};  // Used to store the compensation parameters stored in the chip ROM

/**
 * @brief   BMP280 initialize
 */
void BM280_Init(void)
{
    uint8_t lsb, msb;

    // Correction value of the temperature
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_T1_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_T1_MSB_REG, &msb, 1);
    bmp280Cc.T1 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_T2_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_T2_MSB_REG, &msb, 1);
    bmp280Cc.T2 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_T3_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_T3_MSB_REG, &msb, 1);
    bmp280Cc.T3 = (((uint16_t)msb) << 8) + lsb;

    // Correction value of the pressure
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P1_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P1_MSB_REG, &msb, 1);
    bmp280Cc.P1 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P2_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P2_MSB_REG, &msb, 1);
    bmp280Cc.P2 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P3_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P3_MSB_REG, &msb, 1);
    bmp280Cc.P3 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P4_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P4_MSB_REG, &msb, 1);
    bmp280Cc.P4 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P5_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P5_MSB_REG, &msb, 1);
    bmp280Cc.P5 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P6_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P6_MSB_REG, &msb, 1);
    bmp280Cc.P6 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P7_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P7_MSB_REG, &msb, 1);
    bmp280Cc.P7 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P8_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P8_MSB_REG, &msb, 1);
    bmp280Cc.P8 = (((uint16_t)msb) << 8) + lsb;
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P9_LSB_REG, &lsb, 1);
    I2C_ReadReg(BMP280_ADDRESS, BMP280_DIG_P9_MSB_REG, &msb, 1);
    bmp280Cc.P9 = (((uint16_t)msb) << 8) + lsb;

    // Reset
    I2C_WriteReg(BMP280_ADDRESS, BMP280_RESET_REG, (uint8_t*)BMP280_RESET_VALUE, 1);

    BMP280_OVERSAMPLE_MODE BMP_OVERSAMPLE_MODEStructure;
    BMP_OVERSAMPLE_MODEStructure.P_Osample = BMP280_P_MODE_3;
    BMP_OVERSAMPLE_MODEStructure.T_Osample = BMP280_T_MODE_1;
    BMP_OVERSAMPLE_MODEStructure.WORKMODE = BMP280_NORMAL_MODE;
    BMP280_SetOversamp(&BMP_OVERSAMPLE_MODEStructure);

    BMP280_CONFIG BMP_CONFIGStructure;
    BMP_CONFIGStructure.T_SB = BMP280_T_SB1;
    BMP_CONFIGStructure.FILTER_COEFFICIENT = BMP280_FILTER_MODE_4;
    BMP_CONFIGStructure.SPI_EN = DISABLE;

    BMP280_SetStandbyFilter(&BMP_CONFIGStructure);
}

/**
 * @brief   BMP280 check whether the device exists
 * @return  errCode, 0: success, !0: error
 */
uint8_t BMP280_InitAndCheck(void)
{
    BM280_Init();
    DelayMs(50);

    uint8_t bmp280Id = 0;
    bmp280Id = BMP280_ReadId();
#ifdef __DEBUG_BMP280_ATY
    printf("\r\nBMP280 ID: 0x%02X", bmp280Id);
#endif /* __DEBUG_BMP280_ATY */
    // 0xD8 = 0x88 | 0x58
    if(bmp280Id & 0xD8 != 0xD8)
        return 1;

    DelayMs(200);

    return 0;
}

/**
 * @brief   BMP280 read temperature and pressure
 * @param   tp data group to save tp value
 * @return  errCode, 0: success, !0: error
 */
uint8_t BMP280_ReadTP(double* tp)
{
    uint16_t errCount = 1000;
    for(uint8_t i = 0; i < errCount; i++)
    {
        if(BMP280_GetStatus(BMP280_MEASURING) == 0)
            break;
        if(i == errCount - 1)
            return 2;
        DelayMs(1);
    }
    for(uint8_t i = 0; i < errCount; i++)
    {
        if(BMP280_GetStatus(BMP280_IM_UPDATE) == 0)
            break;
        if(i == errCount - 1)
            return 3;
        DelayMs(1);
    }
    tp[0] = BMP280_GetTemperature();
    tp[1] = BMP280_GetPressure();

    return 0;
}


uint8_t bmp280InitFlag = 0;

/**
 * @brief   BMP280 get data flow path
 * @param   tp data group to save tp value
 * @return  errCode, 0: success, !0: error
 */
uint8_t BMP280_TempPreGet(uint16_t* tp)
{
    double bmp280Value[2];

    if(bmp280InitFlag == 0)
    {
        if(BMP280_InitAndCheck())
        {
            bmp280InitFlag = 2;
        }
        else
        {
            bmp280InitFlag = 1;
        }
    }
    if(bmp280InitFlag == 2)
    {
#ifdef __DEBUG_BMP280_ATY
        printf("\r\nDevice wrong!");
#endif /* __DEBUG_BMP280_ATY */
        return 0xFF;
    }
    else if(bmp280InitFlag == 1)
    {
        uint8_t errValue = 0;
        errValue = BMP280_ReadTP(bmp280Value);
        if(errValue == 0)
        {
            if(bmp280Value[1] != 0)
            {
                tp[0] = ((bmp280Value[0] * 1000) + 5) / 10;
                tp[1] = (((bmp280Value[1] - 90000) * 10) + 5) / 10;
#ifdef __DEBUG_BMP280_ATY
                printf("\r\nTemperature %f C Pressure %f Pa", bmp280Value[0], bmp280Value[1]);
#endif /* __DEBUG_BMP280_ATY */
            }
            else
            {
#ifdef __DEBUG_BMP280_ATY
                printf("\r\nData get wrong!");
#endif /* __DEBUG_AHT20_ATY */
                return 0xFD;
            }
        }
        else
        {
#ifdef __DEBUG_BMP280_ATY
            printf("\r\nBMP280 timeout! Err: %d", errValue);
#endif /* __DEBUG_BMP280_ATY */
            return 0xFE;
        }
    }

    return 0;
}



#endif /* __BMP280_ATY_C */

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