133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/* for usleep() */
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#define _DEFAULT_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "bme680.h"
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#include "i2c.h"
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#include "spi.h"
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#define AMBIENT_TEMP_GUESS 19.0
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/* heater prob won't settle */
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#define HEATER_TARGET_CLEAN_SENSOR 380.0
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/* for the "real" measurement */
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#define HEATER_TARGET 300.0
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void pretty_print(bme680_t *bme680);
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int main(void) {
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bme680_t bme680;
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uint8_t mode;
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int i;
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bme680.dev.init = spi_init;
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bme680.dev.read = spi_read;
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bme680.dev.write = spi_write;
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bme680.dev.deinit = spi_deinit;
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bme680.dev.sleep = usleep;
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mode = BME680_MODE_FLOAT | BME680_SPI | BME680_ENABLE_GAS;
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if (bme680_init(&bme680, mode) != 0) {
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fprintf(stderr, "bme680_init()\n");
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exit(EXIT_FAILURE);
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}
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bme680_reset(&bme680);
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if (bme680_calibrate(&bme680) != 0) {
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fprintf(stderr, "bme680_calibrate()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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bme680.cfg.osrs_t = BME680_OVERSAMPLE_X16;
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bme680.cfg.osrs_p = BME680_OVERSAMPLE_X16;
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bme680.cfg.osrs_h = BME680_OVERSAMPLE_X8;
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bme680.cfg.filter = BME680_IIR_COEFF_127;
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for(i=0; i<10; i++) {
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/* extra heat to clean the sensor surface. might work ! */
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if (i < 6) {
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bme680.cfg.res_heat[i] = bme680_calc_target(&bme680, HEATER_TARGET_CLEAN_SENSOR, AMBIENT_TEMP_GUESS);
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bme680.cfg.idac_heat[i] = BME680_IDAC(100); // 12.5 mA
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bme680.cfg.gas_wait[i] = BME680_GAS_WAIT(50, BME680_GAS_WAIT_X4);
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} else {
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bme680.cfg.res_heat[i] = bme680_calc_target(&bme680, HEATER_TARGET, AMBIENT_TEMP_GUESS);
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bme680.cfg.idac_heat[i] = BME680_IDAC(50);
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bme680.cfg.gas_wait[i] = BME680_GAS_WAIT(50, BME680_GAS_WAIT_X4);
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}
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}
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bme680.setpoint = 0;
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if (bme680_configure(&bme680) != 0) {
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fprintf(stderr, "bme680_configure()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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printf("heater_target=%.1f, ambient_temp=%.1f\n", HEATER_TARGET, AMBIENT_TEMP_GUESS);
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printf("first few setpoints have heater_target=%1.f\n", HEATER_TARGET_CLEAN_SENSOR);
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for(i=0; i<10; i++) {
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bme680.setpoint = i;
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if (bme680_write_setpoint_index(&bme680) != 0) {
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fprintf(stderr, "bme680_write_setpoint()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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if (bme680_start(&bme680) != 0) {
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fprintf(stderr, "bme680_start()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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if (bme680_poll(&bme680) != 0) {
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fprintf(stderr, "bme680_poll()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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if (bme680_read(&bme680) != 0) {
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fprintf(stderr, "bme680_read()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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pretty_print(&bme680);
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}
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bme680_deinit(&bme680);
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return 0;
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}
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void pretty_print(bme680_t *bme680) {
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uint8_t dev_sp;
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bme680_read_setpoint_index(bme680, &dev_sp);
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double t = bme680->fcomp.temp;
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double p = bme680->fcomp.press / 100.0;
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double h = bme680->fcomp.hum;
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double gr = bme680->fcomp.gas_res;
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int gv = bme680->gas_valid;
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int hs = bme680->heat_stab;
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printf("[Setpoint %d] temp=%.2f°C, press=%.2f mbar, hum=%.2f %%RH, gas_res=%.2f gv=%d hs=%d\n",
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dev_sp, t, p, h, gr, gv, hs);
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}
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