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Modifications reserved |Data subject to change without notice | Printed in Germany

Document number: BST-BMP388-DS001-07 Revision_1.7_112020

9.3.

Pressure compensation

static float BMP388_compensate_pressure(uint32_t uncomp_press, struct BMP388_calib_data *calib_data)

{

/* Variable to store the compensated pressure */

float comp_press;

/* Temporary variables used for compensation */

float partial_data1;

float partial_data2;

float partial_data3;

float partial_data4;

float partial_out1;

float partial_out2;

/* Calibration data */

partial_data1 = calib_data->par_p6 * calib_data->t_lin;

partial_data2 = calib_data->par_p7 * (calib_data->t_lin * calib_data->t_lin);

partial_data3 = calib_data->par_p8 * (calib_data->t_lin * calib_data->t_lin * calib_data->t_lin);

partial_out1 = calib_data->par_p5 + partial_data1 + partial_data2 + partial_data3;

partial_data1 = calib_data->par_p2 * calib_data->t_lin;

partial_data2 = calib_data->par_p3 * (calib_data->t_lin * calib_data->t_lin);

partial_data3 = calib_data->par_p4 * (calib_data->t_lin * calib_data->t_lin * calib_data->t_lin);

partial_out2 = (float)uncomp_press *

(calib_data->par_p1 + partial_data1 + partial_data2 + partial_data3);

partial_data1 = (float)uncomp_press * (float)uncomp_press;

partial_data2 = calib_data->par_p9 + calib_data->par_p10 * calib_data->t_lin;

partial_data3 = partial_data1 *

partial_data2;

partial_data4 = partial_data3 + ((float)uncomp_press * (float)uncomp_press * (float)uncomp_press) * calib_data->par_p11;

comp_press = partial_out1 + partial_out2 + partial_data4;

return comp_press;

}

BMP388 데이터시트(PDF) 56 Page - Bosch Sensortec GmbH