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Modifications reserved |Data subject not change without notice | Printed in Germany

Document number: BST-BMEP388-DS001-01 Revision_1.1_032018

9. Appendix: Computation formulae reference implementation

The code below gives a provides a C implementation of the compensation algorithms discussed in Sec. 3.10.

The struct BMP388_calib_data is a structure, that contains the calibration coefficients. And the t_lin variable that carries a

temperature value over to the pressure compensation.

9.1.

Calibration coefficient

The calibration coefficents are stored as described in Table 22. The compensation formula is implemented in floating point.

Therefore the coefficient have to be converted into floating point numbers by the following formulas.

��_��1 =

��_��_��1

2−8

��_��2 =

��_��_��2

230

��_��3 =

��_��_��3

248

��_��1 =

��_��_��1 − 214

220

��_��2 =

��_��_��2 − 214

229

��_��3 =

��_��_��3

232

��_��4 =

��_��_��4

237

��_��5 =

��_��_��5

2−3

��_��6 =

��_��_��6

��_��7 =

��_��_��7

��_��8 =

��_��_��8

215

��_��9 =

��_��_��9

248

��_��10 =

��_��_��10

248

��_��11 =

��_��_��11

265

9.2.

Temperature compensation

static float BMP388_compensate_temperature(uint32_t uncomp_temp, struct BMP388_calib_data *calib_data)

{

float partial_data1;

float partial_data2;

partial_data1 = (float)(uncomp_temp – calib_data->par_t1);

partial_data2 = (float)(partial_data1 * calib_data->par_t2);

/* Update the compensated temperature in calib structure since this is

* needed for pressure calculation */

calib_data->t_lin = partial_data2 + (partial_data1 * partial_data1) * calib_data->par_t3;

/* Returns compensated temperature */

return calib_data->t_lin;

}

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