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bmp280.c
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bmp280.c
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/**
* Copyright (c) 2020 Bosch Sensortec GmbH. All rights reserved.
*
* BSD-3-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @file bmp280.c
* @date 2020-01-10
* @version v3.3.4
*
*/
#include "bmp280.h"
/********************** Static function declarations ************************/
/*!
* @brief This internal API is used to check for null-pointers in the device
* structure.
*
* @param[in] dev : Structure instance of bmp280_dev.
*
* @return Result of API execution status
* @retval Zero for Success, non-zero otherwise.
*/
static int8_t null_ptr_check(const struct bmp280_dev *dev);
/*!
* @brief This internal API interleaves the register addresses and respective
* register data for a burst write
*
* @param[in] reg_addr: Register address array
* @param[out] temp_buff: Interleaved register address and data array
* @param[in] reg_addr: Register data array
* @param[in] len : Length of the reg_addr and reg_data arrays
*
* @return Result of API execution status
* @retval Zero for Success, non-zero otherwise.
*/
static void interleave_data(const uint8_t *reg_addr, uint8_t *temp_buff, const uint8_t *reg_data, uint8_t len);
/*!
* @brief This API is used to read the calibration parameters used
* for calculating the compensated data.
*
* @param[in] dev : Structure instance of bmp280_dev
*
* @return Result of API execution
* @retval Zero for Success, non-zero otherwise.
*/
static int8_t get_calib_param(struct bmp280_dev *dev);
/*!
* @brief This internal API to reset the sensor, restore/set conf, restore/set mode
*
* @param[in] mode: Desired mode
* @param[in] conf : Desired configuration to the bmp280
* conf.os_temp, conf.os_pres = BMP280_OS_NONE, BMP280_OS_1X,
* BMP280_OS_2X, BMP280_OS_4X, BMP280_OS_8X, BMP280_OS_16X
* conf.mode = BMP280_SLEEP_MODE, BMP280_FORCED_MODE, BMP280_NORMAL_MODE
* conf.odr = BMP280_ODR_0_5_MS, BMP280_ODR_62_5_MS, BMP280_ODR_125_MS,
* BMP280_ODR_250_MS, BMP280_ODR_500_MS, BMP280_ODR_1000_MS,
* BMP280_ODR_2000_MS, BMP280_ODR_4000_MS
* conf.filter = BMP280_FILTER_OFF, BMP280_FILTER_COEFF_2,
* BMP280_FILTER_COEFF_4, BMP280_FILTER_COEFF_8, BMP280_FILTER_COEFF_16
* @param[in] dev : Structure instance of bmp280_dev
*
* @return Result of API execution status
* @retval Zero for Success, non-zero otherwise.
*/
static int8_t conf_sensor(uint8_t mode, const struct bmp280_config *conf, struct bmp280_dev *dev);
/*!
* @This internal API checks whether the uncompensated temperature and pressure are within the range
*
* @param[in] utemperature : uncompensated temperature
* @param[in] upressure : uncompensated pressure
*
* @return Result of API execution status
* @retval Zero for Success, non-zero otherwise.
*/
static int8_t st_check_boundaries(int32_t utemperature, int32_t upressure);
/****************** User Function Definitions *******************************/
/*!
* @brief This API reads the data from the given register address of the
* sensor.
*/
int8_t bmp280_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint8_t len, const struct bmp280_dev *dev)
{
int8_t rslt;
rslt = null_ptr_check(dev);
if ((rslt == BMP280_OK) && (reg_data != NULL))
{
/* Mask the register address' MSB if interface selected is SPI */
if (dev->intf == BMP280_SPI_INTF)
{
reg_addr = reg_addr | 0x80;
printf("---- HIER das darf nie sein! ---\n\r");
}
//rslt = dev->read(dev->dev_id, reg_addr, reg_data, len);
// g_i2cFid hat den Wert von 3
printf("---- HIER bei dev->read ---\n\r");
rslt = dev->read(3, reg_addr, reg_data, len);
printf("Nach_Result\n\r");
printf("Dev-ID:%i\n\r", dev->dev_id);
/* Check for communication error and mask with an internal error code */
if (rslt != BMP280_OK)
{
rslt = BMP280_E_COMM_FAIL;
}
}
else
{
rslt = BMP280_E_NULL_PTR;
}
return rslt;
}
/*!
* @brief This API writes the given data to the register addresses
* of the sensor.
*/
int8_t bmp280_set_regs(uint8_t *reg_addr, const uint8_t *reg_data, uint8_t len, const struct bmp280_dev *dev)
{
int8_t rslt;
uint8_t temp_buff[8]; /* Typically not to write more than 4 registers */
uint16_t temp_len;
uint8_t reg_addr_cnt;
if (len > 4)
{
len = 4;
}
rslt = null_ptr_check(dev);
if ((rslt == BMP280_OK) && (reg_addr != NULL) && (reg_data != NULL))
{
if (len != 0)
{
temp_buff[0] = reg_data[0];
/* Mask the register address' MSB if interface selected is SPI */
if (dev->intf == BMP280_SPI_INTF)
{
/* Converting all the reg address into proper SPI write address
* i.e making MSB(R/`W) bit 0
*/
for (reg_addr_cnt = 0; reg_addr_cnt < len; reg_addr_cnt++)
{
reg_addr[reg_addr_cnt] = reg_addr[reg_addr_cnt] & 0x7F;
}
}
/* Burst write mode */
if (len > 1)
{
/* Interleave register address w.r.t data for burst write*/
interleave_data(reg_addr, temp_buff, reg_data, len);
temp_len = ((len * 2) - 1);
}
else
{
temp_len = len;
}
//rslt = dev->write(BMP280_I2C_ADDR_PRIM, reg_addr[0], temp_buff, temp_len);
printf("Hier ein WRITE Nr.1\n\r");
rslt = dev->write(3, reg_addr[0], temp_buff, temp_len);
printf("Hier nach dem WRITE Nr.1\n\r");
/* Check for communication error and mask with an internal error code */
if (rslt != BMP280_OK)
{
rslt = BMP280_E_COMM_FAIL;
}
}
else
{
rslt = BMP280_E_INVALID_LEN;
}
}
else
{
rslt = BMP280_E_NULL_PTR;
}
return rslt;
}
/*!
* @brief This API triggers the soft reset of the sensor.
*/
int8_t bmp280_soft_reset(const struct bmp280_dev *dev)
{
int8_t rslt;
uint8_t reg_addr = BMP280_SOFT_RESET_ADDR;
uint8_t soft_rst_cmd = BMP280_SOFT_RESET_CMD;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
printf("Vor bmp280_set_regs()\n\r");
rslt = bmp280_set_regs(®_addr, &soft_rst_cmd, 1, dev);
/* As per the datasheet, startup time is 2 ms. */
dev->delay_ms(20); //dev->delay_ms(2);
}
return rslt;
}
/*!
* @brief This API is the entry point.
* It reads the chip-id and calibration data from the sensor.
*/
int8_t bmp280_init(struct bmp280_dev *dev)
{
int8_t rslt;
/* Maximum number of tries before timeout */
uint8_t try_count = 5;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
while (try_count)
{
rslt = bmp280_get_regs(BMP280_CHIP_ID_ADDR, &dev->chip_id, 1, dev);
/* Check for chip id validity */
if ((rslt == BMP280_OK) &&
(dev->chip_id == BMP280_CHIP_ID1 || dev->chip_id == BMP280_CHIP_ID2 || dev->chip_id == BMP280_CHIP_ID3))
{
printf("Check Chip()\n\r");
rslt = bmp280_soft_reset(dev);
if (rslt == BMP280_OK)
{
rslt = get_calib_param(dev);
printf("Chip OK, wird kalibriert\n\r");
}
break;
}
/* Wait for 10 ms */
dev->delay_ms(100); // dev->delay_ms(10);
--try_count;
}
/* Chip id check failed, and timed out */
if (!try_count)
{
rslt = BMP280_E_DEV_NOT_FOUND;
}
if (rslt == BMP280_OK)
{
/* Set values to default */
dev->conf.filter = BMP280_FILTER_OFF;
dev->conf.os_pres = BMP280_OS_NONE;
dev->conf.os_temp = BMP280_OS_NONE;
dev->conf.odr = BMP280_ODR_0_5_MS;
dev->conf.spi3w_en = BMP280_SPI3_WIRE_DISABLE;
}
}
return rslt;
}
/*!
* @brief This API reads the data from the ctrl_meas register and config
* register. It gives the currently set temperature and pressure over-sampling
* configuration, power mode configuration, sleep duration and
* IIR filter coefficient.
*/
int8_t bmp280_get_config(struct bmp280_config *conf, struct bmp280_dev *dev)
{
printf(" ---- DAVOR -----!!!");
int8_t rslt;
uint8_t temp[2] = { 0, 0 };
rslt = null_ptr_check(dev);
if ((rslt == BMP280_OK) && (conf != NULL))
{
rslt = bmp280_get_regs(BMP280_CTRL_MEAS_ADDR, temp, 2, dev);
printf(" ---- DANACH -----!!!");
if (rslt == BMP280_OK)
{
conf->os_temp = BMP280_GET_BITS(BMP280_OS_TEMP, temp[0]);
conf->os_pres = BMP280_GET_BITS(BMP280_OS_PRES, temp[0]);
conf->odr = BMP280_GET_BITS(BMP280_STANDBY_DURN, temp[1]);
conf->filter = BMP280_GET_BITS(BMP280_FILTER, temp[1]);
conf->spi3w_en = BMP280_GET_BITS_POS_0(BMP280_SPI3_ENABLE, temp[1]);
dev->conf = *conf;
}
}
else
{
rslt = BMP280_E_NULL_PTR;
}
return rslt;
}
/*!
* @brief This API writes the data to the ctrl_meas register and config register.
* It sets the temperature and pressure over-sampling configuration,
* power mode configuration, sleep duration and IIR filter coefficient.
*/
int8_t bmp280_set_config(const struct bmp280_config *conf, struct bmp280_dev *dev)
{
return conf_sensor(BMP280_SLEEP_MODE, conf, dev);
}
/*!
* @brief This API reads the status register
*/
int8_t bmp280_get_status(struct bmp280_status *status, const struct bmp280_dev *dev)
{
int8_t rslt;
uint8_t temp;
rslt = null_ptr_check(dev);
if ((rslt == BMP280_OK) && (status != NULL))
{
rslt = bmp280_get_regs(BMP280_STATUS_ADDR, &temp, 1, dev);
status->measuring = BMP280_GET_BITS(BMP280_STATUS_MEAS, temp);
status->im_update = BMP280_GET_BITS_POS_0(BMP280_STATUS_IM_UPDATE, temp);
}
else
{
rslt = BMP280_E_NULL_PTR;
}
return rslt;
}
/*!
* @brief This API reads the power mode.
*/
int8_t bmp280_get_power_mode(uint8_t *mode, const struct bmp280_dev *dev)
{
int8_t rslt;
uint8_t temp;
rslt = null_ptr_check(dev);
if ((rslt == BMP280_OK) && (mode != NULL))
{
rslt = bmp280_get_regs(BMP280_CTRL_MEAS_ADDR, &temp, 1, dev);
*mode = BMP280_GET_BITS_POS_0(BMP280_POWER_MODE, temp);
}
else
{
rslt = BMP280_E_NULL_PTR;
}
return rslt;
}
/*!
* @brief This API writes the power mode.
*/
int8_t bmp280_set_power_mode(uint8_t mode, struct bmp280_dev *dev)
{
int8_t rslt;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
rslt = conf_sensor(mode, &dev->conf, dev);
}
return rslt;
}
/*!
* @brief This API reads the temperature and pressure data registers.
* It gives the raw temperature and pressure data .
*/
int8_t bmp280_get_uncomp_data(struct bmp280_uncomp_data *uncomp_data, const struct bmp280_dev *dev)
{
int8_t rslt;
uint8_t temp[6] = { 0 };
rslt = null_ptr_check(dev);
if ((rslt == BMP280_OK) && (uncomp_data != NULL))
{
rslt = bmp280_get_regs(BMP280_PRES_MSB_ADDR, temp, 6, dev);
if (rslt == BMP280_OK)
{
uncomp_data->uncomp_press =
(int32_t) ((((uint32_t) (temp[0])) << 12) | (((uint32_t) (temp[1])) << 4) | ((uint32_t) temp[2] >> 4));
uncomp_data->uncomp_temp =
(int32_t) ((((int32_t) (temp[3])) << 12) | (((int32_t) (temp[4])) << 4) | (((int32_t) (temp[5])) >> 4));
rslt = st_check_boundaries((int32_t)uncomp_data->uncomp_temp, (int32_t)uncomp_data->uncomp_press);
}
else
{
rslt = BMP280_E_UNCOMP_DATA_CALC;
}
}
else
{
rslt = BMP280_E_NULL_PTR;
}
return rslt;
}
/*!
* @brief This API is used to get the compensated temperature from
* uncompensated temperature. This API uses 32 bit integers.
*/
int8_t bmp280_get_comp_temp_32bit(int32_t *comp_temp, int32_t uncomp_temp, struct bmp280_dev *dev)
{
int32_t var1, var2;
int8_t rslt;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
var1 =
((((uncomp_temp / 8) - ((int32_t) dev->calib_param.dig_t1 << 1))) * ((int32_t) dev->calib_param.dig_t2)) /
2048;
var2 =
(((((uncomp_temp / 16) - ((int32_t) dev->calib_param.dig_t1)) *
((uncomp_temp / 16) - ((int32_t) dev->calib_param.dig_t1))) / 4096) *
((int32_t) dev->calib_param.dig_t3)) /
16384;
dev->calib_param.t_fine = var1 + var2;
*comp_temp = (dev->calib_param.t_fine * 5 + 128) / 256;
rslt = BMP280_OK;
}
else
{
*comp_temp = 0;
rslt = BMP280_E_32BIT_COMP_TEMP;
}
return rslt;
}
/*!
* @brief This API is used to get the compensated pressure from
* uncompensated pressure. This API uses 32 bit integers.
*/
int8_t bmp280_get_comp_pres_32bit(uint32_t *comp_pres, uint32_t uncomp_pres, const struct bmp280_dev *dev)
{
int32_t var1, var2;
int8_t rslt;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
var1 = (((int32_t) dev->calib_param.t_fine) / 2) - (int32_t) 64000;
var2 = (((var1 / 4) * (var1 / 4)) / 2048) * ((int32_t) dev->calib_param.dig_p6);
var2 = var2 + ((var1 * ((int32_t) dev->calib_param.dig_p5)) * 2);
var2 = (var2 / 4) + (((int32_t) dev->calib_param.dig_p4) * 65536);
var1 =
(((dev->calib_param.dig_p3 * (((var1 / 4) * (var1 / 4)) / 8192)) / 8) +
((((int32_t) dev->calib_param.dig_p2) * var1) / 2)) / 262144;
var1 = ((((32768 + var1)) * ((int32_t) dev->calib_param.dig_p1)) / 32768);
*comp_pres = (uint32_t)(((int32_t)(1048576 - uncomp_pres) - (var2 / 4096)) * 3125);
/* Avoid exception caused by division with zero */
if (var1 != 0)
{
/* Check for overflows against UINT32_MAX/2; if pres is left-shifted by 1 */
if (*comp_pres < 0x80000000)
{
*comp_pres = (*comp_pres << 1) / ((uint32_t) var1);
}
else
{
*comp_pres = (*comp_pres / (uint32_t) var1) * 2;
}
var1 = (((int32_t) dev->calib_param.dig_p9) * ((int32_t) (((*comp_pres / 8) * (*comp_pres / 8)) / 8192))) /
4096;
var2 = (((int32_t) (*comp_pres / 4)) * ((int32_t) dev->calib_param.dig_p8)) / 8192;
*comp_pres = (uint32_t) ((int32_t) *comp_pres + ((var1 + var2 + dev->calib_param.dig_p7) / 16));
rslt = BMP280_OK;
}
else
{
*comp_pres = 0;
rslt = BMP280_E_32BIT_COMP_PRESS;
}
}
return rslt;
}
#ifndef BMP280_DISABLE_64BIT_COMPENSATION
/*!
* @brief This API is used to get the compensated pressure from
* uncompensated pressure. This API uses 64 bit integers.
*/
int8_t bmp280_get_comp_pres_64bit(uint32_t *pressure, uint32_t uncomp_pres, const struct bmp280_dev *dev)
{
int64_t var1, var2, p;
int8_t rslt;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
var1 = ((int64_t) (dev->calib_param.t_fine)) - 128000;
var2 = var1 * var1 * (int64_t) dev->calib_param.dig_p6;
var2 = var2 + ((var1 * (int64_t) dev->calib_param.dig_p5) * 131072);
var2 = var2 + (((int64_t) dev->calib_param.dig_p4) * 34359738368);
var1 = ((var1 * var1 * (int64_t) dev->calib_param.dig_p3) / 256) +
((var1 * (int64_t) dev->calib_param.dig_p2) * 4096);
var1 = ((INT64_C(0x800000000000) + var1) * ((int64_t)dev->calib_param.dig_p1)) / 8589934592;
if (var1 != 0)
{
p = 1048576 - uncomp_pres;
p = (((((p * 2147483648U)) - var2) * 3125) / var1);
var1 = (((int64_t) dev->calib_param.dig_p9) * (p / 8192) * (p / 8192)) / 33554432;
var2 = (((int64_t) dev->calib_param.dig_p8) * p) / 524288;
p = ((p + var1 + var2) / 256) + (((int64_t)dev->calib_param.dig_p7) * 16);
*pressure = (uint32_t)p;
rslt = BMP280_OK;
}
else
{
*pressure = 0;
rslt = BMP280_E_64BIT_COMP_PRESS;
}
}
return rslt;
}
#endif /* BMP280_DISABLE_64BIT_COMPENSATION */
#ifndef BMP280_DISABLE_DOUBLE_COMPENSATION
/*!
* @brief This API is used to get the compensated temperature from
* uncompensated temperature. This API uses double floating precision.
*/
int8_t bmp280_get_comp_temp_double(double *temperature, int32_t uncomp_temp, struct bmp280_dev *dev)
{
double var1, var2;
int8_t rslt;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
var1 = (((double) uncomp_temp) / 16384.0 - ((double) dev->calib_param.dig_t1) / 1024.0) *
((double) dev->calib_param.dig_t2);
var2 =
((((double) uncomp_temp) / 131072.0 - ((double) dev->calib_param.dig_t1) / 8192.0) *
(((double) uncomp_temp) / 131072.0 - ((double) dev->calib_param.dig_t1) / 8192.0)) *
((double) dev->calib_param.dig_t3);
dev->calib_param.t_fine = (int32_t) (var1 + var2);
*temperature = ((var1 + var2) / 5120.0);
}
else
{
*temperature = 0;
rslt = BMP280_E_DOUBLE_COMP_TEMP;
}
return rslt;
}
/*!
* @brief This API is used to get the compensated pressure from
* uncompensated pressure. This API uses double floating precision.
*/
int8_t bmp280_get_comp_pres_double(double *pressure, uint32_t uncomp_pres, const struct bmp280_dev *dev)
{
double var1, var2;
int8_t rslt;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
var1 = ((double) dev->calib_param.t_fine / 2.0) - 64000.0;
var2 = var1 * var1 * ((double) dev->calib_param.dig_p6) / 32768.0;
var2 = var2 + var1 * ((double) dev->calib_param.dig_p5) * 2.0;
var2 = (var2 / 4.0) + (((double) dev->calib_param.dig_p4) * 65536.0);
var1 = (((double)dev->calib_param.dig_p3) * var1 * var1 / 524288.0 + ((double)dev->calib_param.dig_p2) * var1) /
524288.0;
var1 = (1.0 + var1 / 32768.0) * ((double) dev->calib_param.dig_p1);
*pressure = 1048576.0 - (double)uncomp_pres;
if (var1 < 0 || var1 > 0)
{
*pressure = (*pressure - (var2 / 4096.0)) * 6250.0 / var1;
var1 = ((double)dev->calib_param.dig_p9) * (*pressure) * (*pressure) / 2147483648.0;
var2 = (*pressure) * ((double)dev->calib_param.dig_p8) / 32768.0;
*pressure = *pressure + (var1 + var2 + ((double)dev->calib_param.dig_p7)) / 16.0;
}
else
{
*pressure = 0;
rslt = BMP280_E_DOUBLE_COMP_PRESS;
}
}
return rslt;
}
#endif /* BMP280_DISABLE_DOUBLE_COMPENSATION */
/*!
* @brief This API computes the measurement time in milliseconds for the
* active configuration
*/
uint8_t bmp280_compute_meas_time(const struct bmp280_dev *dev)
{
uint32_t period = 0;
uint32_t t_dur = 0, p_dur = 0, p_startup = 0;
const uint32_t startup = 1000, period_per_osrs = 2000; /* Typical timings in us. Maximum is +15% each */
int8_t rslt;
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
t_dur = period_per_osrs * ((UINT32_C(1) << dev->conf.os_temp) >> 1);
p_dur = period_per_osrs * ((UINT32_C(1) << dev->conf.os_pres) >> 1);
p_startup = (dev->conf.os_pres) ? 500 : 0;
/* Increment the value to next highest integer if greater than 0.5 */
period = startup + t_dur + p_startup + p_dur + 500;
period /= 1000; /* Convert to milliseconds */
}
return (uint8_t)period;
}
/****************** Static Function Definitions *******************************/
/*!
* @brief This internal API is used to check for null-pointers in the device
* structure.
*/
static int8_t null_ptr_check(const struct bmp280_dev *dev)
{
int8_t rslt;
if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_ms == NULL))
{
/* Null-pointer found */
rslt = BMP280_E_NULL_PTR;
printf("Achtung: NULL Pointer gefunden\n\r");
}
else
{
rslt = BMP280_OK;
}
return rslt;
}
/*!
* @brief This internal API interleaves the register addresses and respective
* register data for a burst write
*/
static void interleave_data(const uint8_t *reg_addr, uint8_t *temp_buff, const uint8_t *reg_data, uint8_t len)
{
uint8_t index;
for (index = 1; index < len; index++)
{
temp_buff[(index * 2) - 1] = reg_addr[index];
temp_buff[index * 2] = reg_data[index];
}
}
/*!
* @brief This API is used to read the calibration parameters used
* for calculating the compensated data.
*/
static int8_t get_calib_param(struct bmp280_dev *dev)
{
int8_t rslt;
uint8_t temp[BMP280_CALIB_DATA_SIZE] = { 0 };
rslt = null_ptr_check(dev);
if (rslt == BMP280_OK)
{
rslt = bmp280_get_regs(BMP280_DIG_T1_LSB_ADDR, temp, BMP280_CALIB_DATA_SIZE, dev);
if (rslt == BMP280_OK)
{
dev->calib_param.dig_t1 =
(uint16_t) (((uint16_t) temp[BMP280_DIG_T1_MSB_POS] << 8) | ((uint16_t) temp[BMP280_DIG_T1_LSB_POS]));
dev->calib_param.dig_t2 =
(int16_t) (((int16_t) temp[BMP280_DIG_T2_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_T2_LSB_POS]));
dev->calib_param.dig_t3 =
(int16_t) (((int16_t) temp[BMP280_DIG_T3_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_T3_LSB_POS]));
dev->calib_param.dig_p1 =
(uint16_t) (((uint16_t) temp[BMP280_DIG_P1_MSB_POS] << 8) | ((uint16_t) temp[BMP280_DIG_P1_LSB_POS]));
dev->calib_param.dig_p2 =
(int16_t) (((int16_t) temp[BMP280_DIG_P2_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P2_LSB_POS]));
dev->calib_param.dig_p3 =
(int16_t) (((int16_t) temp[BMP280_DIG_P3_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P3_LSB_POS]));
dev->calib_param.dig_p4 =
(int16_t) (((int16_t) temp[BMP280_DIG_P4_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P4_LSB_POS]));
dev->calib_param.dig_p5 =
(int16_t) (((int16_t) temp[BMP280_DIG_P5_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P5_LSB_POS]));
dev->calib_param.dig_p6 =
(int16_t) (((int16_t) temp[BMP280_DIG_P6_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P6_LSB_POS]));
dev->calib_param.dig_p7 =
(int16_t) (((int16_t) temp[BMP280_DIG_P7_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P7_LSB_POS]));
dev->calib_param.dig_p8 =
(int16_t) (((int16_t) temp[BMP280_DIG_P8_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P8_LSB_POS]));
dev->calib_param.dig_p9 =
(int16_t) (((int16_t) temp[BMP280_DIG_P9_MSB_POS] << 8) | ((int16_t) temp[BMP280_DIG_P9_LSB_POS]));
}
}
return rslt;
}
/*!
* @brief This internal API to reset the sensor, restore/set conf, restore/set mode
*/
static int8_t conf_sensor(uint8_t mode, const struct bmp280_config *conf, struct bmp280_dev *dev)
{
int8_t rslt;
uint8_t temp[2] = { 0, 0 };
uint8_t reg_addr[2] = { BMP280_CTRL_MEAS_ADDR, BMP280_CONFIG_ADDR };
rslt = null_ptr_check(dev);
if ((rslt == BMP280_OK) && (conf != NULL))
{
rslt = bmp280_get_regs(BMP280_CTRL_MEAS_ADDR, temp, 2, dev);
if (rslt == BMP280_OK)
{
/* Here the intention is to put the device to sleep
* within the shortest period of time
*/
rslt = bmp280_soft_reset(dev);
if (rslt == BMP280_OK)
{
temp[0] = BMP280_SET_BITS(temp[0], BMP280_OS_TEMP, conf->os_temp);
temp[0] = BMP280_SET_BITS(temp[0], BMP280_OS_PRES, conf->os_pres);
temp[1] = BMP280_SET_BITS(temp[1], BMP280_STANDBY_DURN, conf->odr);
temp[1] = BMP280_SET_BITS(temp[1], BMP280_FILTER, conf->filter);
temp[1] = BMP280_SET_BITS_POS_0(temp[1], BMP280_SPI3_ENABLE, conf->spi3w_en);
rslt = bmp280_set_regs(reg_addr, temp, 2, dev);
if (rslt == BMP280_OK)
{
dev->conf = *conf;
if (mode != BMP280_SLEEP_MODE)
{
/* Write only the power mode register in a separate write */
temp[0] = BMP280_SET_BITS_POS_0(temp[0], BMP280_POWER_MODE, mode);
rslt = bmp280_set_regs(reg_addr, temp, 1, dev);
}
}
}
}
}
else
{
rslt = BMP280_E_NULL_PTR;
}
return rslt;
}
/*!
* @This internal API checks whether the uncompensated temperature and pressure are within the range
*/
static int8_t st_check_boundaries(int32_t utemperature, int32_t upressure)
{
int8_t rslt = 0;
/* check UT and UP for valid range */
if ((utemperature <= BMP280_ST_ADC_T_MIN || utemperature >= BMP280_ST_ADC_T_MAX) &&
(upressure <= BMP280_ST_ADC_P_MIN || upressure >= BMP280_ST_ADC_P_MAX))
{
rslt = BMP280_E_UNCOMP_TEMP_AND_PRESS_RANGE;
}
else if (utemperature <= BMP280_ST_ADC_T_MIN || utemperature >= BMP280_ST_ADC_T_MAX)
{
rslt = BMP280_E_UNCOMP_TEMP_RANGE;
}
else if (upressure <= BMP280_ST_ADC_P_MIN || upressure >= BMP280_ST_ADC_P_MAX)
{
rslt = BMP280_E_UNCOMP_PRES_RANGE;
}
else
{
rslt = BMP280_OK;
}
return rslt;
}