cfabf0e6a2
new file: dev/bme280/README.bme280 new file: dev/bme280/bme280-sensor.c new file: dev/bme280/bme280-sensor.h new file: dev/bme280/bme280.c new file: dev/bme280/bme280.h
273 lines
8.5 KiB
C
273 lines
8.5 KiB
C
/*
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* Copyright (c) 2015, Copyright Robert Olsson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*
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* Author : Robert Olsson rolss@kth.se/robert@radio-sensors.com
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* Created : 2016-09-14
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*/
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/**
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* \file
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* Basic functions for Bosch BME280 based on datasheel Rev 1.1
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*/
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#include "contiki.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <math.h>
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#include "bme280.h"
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#include "dev/bme280-arch.h"
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static struct {
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unsigned short dig_t1;
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signed short dig_t2;
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signed short dig_t3;
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unsigned short dig_p1;
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signed short dig_p2;
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signed short dig_p3;
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signed short dig_p4;
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signed short dig_p5;
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signed short dig_p6;
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signed short dig_p7;
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signed short dig_p8;
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signed short dig_p9;
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unsigned char dig_h1;
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signed short dig_h2;
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unsigned char dig_h3;
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signed short dig_h4;
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signed short dig_h5;
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signed char dig_h6;
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int32_t t_fine;
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uint8_t mode;
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} bm;
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int32_t
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bme280_t_overscale100(int32_t ut)
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{
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int32_t v1, v2, t;
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v1 = ((((ut >> 3) - ((int32_t)bm.dig_t1 << 1))) *
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((int32_t)bm.dig_t2)) >> 11;
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v2 = (((((ut >> 4) - ((int32_t)bm.dig_t1)) * ((ut >> 4) -
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((int32_t)bm.dig_t1))) >> 12) * ((int32_t)bm.dig_t3)) >> 14;
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bm.t_fine = v1 + v2;
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t = (bm.t_fine * 5 + 128) >> 8;
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return t;
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}
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#ifdef BME280_32BIT
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static uint32_t
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bme280_p(int32_t up)
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{
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int32_t v1, v2;
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uint32_t p;
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v1 = (((int32_t)bm.t_fine) >> 1) - (int32_t)64000;
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v2 = (((v1 >> 2) * (v1 >> 2)) >> 11) * ((int32_t)bm.dig_p6);
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v2 = v2 + ((v1 * ((int32_t)bm.dig_p5)) << 1);
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v2 = (v2 >> 2) + (((int32_t)bm.dig_p4) << 16);
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v1 = (((bm.dig_p3 * (((v1 >> 2) * (v1 >> 2)) >> 13)) >> 3) +
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((((int32_t)bm.dig_p2) * v1) >> 1)) >> 18;
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v1 = ((((32768 + v1)) * ((int32_t)bm.dig_p1)) >> 15);
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if(v1 == 0) {
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return 0;
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}
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p = (((uint32_t)(((int32_t)1048576) - up) - (v2 >> 12))) * 3125;
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if(p < 0x80000000) {
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p = (p << 1) / ((uint32_t)v1);
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} else {
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p = (p / (uint32_t)v1) * 2;
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}
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v1 = (((int32_t)bm.dig_p9) * ((int32_t)(((p >> 3) * (p >> 3)) >> 13))) >> 12;
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v2 = (((int32_t)(p >> 2)) * ((int32_t)bm.dig_p8)) >> 13;
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p = (uint32_t)((int32_t)p + ((v1 + v2 + bm.dig_p7) >> 4));
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return p;
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}
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#else
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static uint32_t
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bme280_p_overscale256(int32_t up)
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{
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int64_t v1, v2, p;
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v1 = ((int64_t)bm.t_fine) - 128000;
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v2 = v1 * v1 * (int64_t)bm.dig_p6;
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v2 = v2 + ((v1 * (int64_t)bm.dig_p5) << 17);
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v2 = v2 + (((int64_t)bm.dig_p4) << 35);
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v1 = ((v1 * v1 * (int64_t)bm.dig_p3) >> 8) + ((v1 * (int64_t)bm.dig_p2) << 12);
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v1 = (((((int64_t)1) << 47) + v1)) * ((int64_t)bm.dig_p1) >> 33;
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if(v1 == 0) {
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return 0;
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}
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p = 1048576 - up;
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p = (((p << 31) - v2) * 3125) / v1;
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v1 = (((int64_t)bm.dig_p9) * (p >> 13) * (p >> 13)) >> 25;
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v2 = (((int64_t)bm.dig_p8) * p) >> 19;
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p = (((p + v1 + v2) >> 8) + (((int64_t)bm.dig_p7) << 4));
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return (uint32_t)p;
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}
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#endif
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static uint32_t
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bme280_h_overscale1024(int32_t uh)
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{
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int32_t v1;
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v1 = (bm.t_fine - ((int32_t)76800));
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v1 = (((((uh << 14) - (((int32_t)bm.dig_h4) << 20) - (((int32_t)bm.dig_h5) * v1)) + ((int32_t)16384)) >> 15)
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* (((((((v1 * ((int32_t)bm.dig_h6)) >> 10) * (((v1 * ((int32_t)bm.dig_h3)) >> 11) + ((int32_t)32768)))
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>> 10) + ((int32_t)2097152)) * ((int32_t)bm.dig_h2) + 8192) >> 14));
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v1 = (v1 - (((((v1 >> 15) * (v1 >> 15)) >> 7) * ((int32_t)bm.dig_h1)) >> 4));
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v1 = (v1 < 0 ? 0 : v1);
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v1 = (v1 > 419430400 ? 419430400 : v1);
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return (uint32_t)(v1 >> 12);
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}
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void
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bme280_init(uint8_t mode)
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{
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uint8_t buf[26];
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/* Do not mess with other chips */
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i2c_read_mem(BME280_ADDR, 0xD0, buf, 1);
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if(buf[0] != BME280_CHIP_ID) {
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return;
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}
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i2c_write_mem(BME280_ADDR, BME280_CNTL_RESET, 0xB6);
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clock_delay_msec(BME280_MAX_WAIT);
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memset(buf, 0, sizeof(buf));
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/* Burst read of all calibration part 1 */
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i2c_read_mem(BME280_ADDR, BME280_DIG_T1_ADDR, buf, sizeof(buf));
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bm.dig_t1 = ((uint16_t)buf[1] << 8) | (uint16_t)buf[0];
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bm.dig_t2 = ((int16_t)buf[3] << 8) | (uint16_t)buf[2];
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bm.dig_t3 = ((int16_t)buf[5] << 8) | (uint16_t)buf[4];
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bm.dig_p1 = ((uint16_t)buf[7] << 8) | (uint16_t)buf[6];
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bm.dig_p2 = ((int16_t)buf[9] << 8) | (uint16_t)buf[8];
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bm.dig_p3 = ((int16_t)buf[11] << 8) | (uint16_t)buf[10];
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bm.dig_p4 = ((int16_t)buf[13] << 8) | (uint16_t)buf[12];
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bm.dig_p5 = ((int16_t)buf[15] << 8) | (uint16_t)buf[14];
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bm.dig_p6 = ((int16_t)buf[17] << 8) | (uint16_t)buf[16];
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bm.dig_p7 = ((int16_t)buf[19] << 8) | (uint16_t)buf[18];
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bm.dig_p8 = ((int16_t)buf[21] << 8) | (uint16_t)buf[20];
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bm.dig_p9 = ((int16_t)buf[23] << 8) | (uint16_t)buf[22];
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/* A0 not used */
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bm.dig_h1 = (unsigned char)buf[25];
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/* Burst read of all calibration part 2 */
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i2c_read_mem(BME280_ADDR, BME280_DIG_H2_ADDR, buf, 8);
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bm.dig_h2 = ((int16_t)buf[1] << 8) | (uint16_t)buf[0];
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bm.dig_h3 = (unsigned char)buf[2];
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bm.dig_h4 = ((int16_t)buf[3] << 4) | (((uint16_t)buf[4]) & 0xF);
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bm.dig_h5 = ((int16_t)buf[6] << 4) | (((uint16_t)buf[5]) & 0xF);
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bm.dig_h6 = (unsigned char)buf[7];
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bm.mode = mode;
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}
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void
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bme280_read(uint8_t mode)
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{
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int32_t ut, uh, up;
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uint8_t buf[8], sleep;
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uint16_t i;
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memset(buf, 0, sizeof(buf));
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/* Are we initilized and in the right mode? */
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if(mode == BME280_MODE_NONE || mode != bm.mode) {
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return;
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}
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ut = uh = up = 0;
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/* Weather mode. See sectiom 3.5 Datasheet */
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if(mode == BME280_MODE_WEATHER) {
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/* Humidity oversampling *1 */
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i2c_write_mem(BME280_ADDR, BME280_CNTL_HUM, 0x01);
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/* 00100111 0x27 oversampling *1 for t and p plus normal mode */
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/* 0.5 ms -- no filter -- no SPI */
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i2c_write_mem(BME280_ADDR, BME280_CONTROL, 0x00);
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/* 00100110 0x26 oversampling *1 for t and p plus forced mode */
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/* Trigger measurement needed for every time in forced mode */
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i2c_write_mem(BME280_ADDR, BME280_CNTL_MEAS, 0x26);
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/* Wait to get into sleep mode == measurement done */
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for(i = 0; i < BME280_MAX_WAIT; i++) {
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i2c_read_mem(BME280_ADDR, BME280_CNTL_MEAS, &sleep, 1);
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sleep = sleep& 0x03;
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if(sleep== 0) {
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break;
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} else {
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clock_delay_msec(1);
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}
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}
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if(i == BME280_MAX_WAIT) {
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return; /* error wait*/
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}
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} else { /* if(mode == BME280_MODE_WEATHER) */
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return; /* error mode*/
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}
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/* Burst read of all measurements */
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i2c_read_mem(BME280_ADDR, BME280_PRESS, buf, 8);
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ut = (uint32_t)(buf[3]) << 12 | (uint32_t)(buf[4]) << 4 | (uint32_t)buf[5] >> 4;
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up = (uint32_t)(buf[0]) << 12 | (uint32_t)(buf[1]) << 4 | (uint32_t)buf[2] >> 4;
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uh = (uint32_t)(buf[6]) << 8 | (uint32_t)buf[7];
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bme280_mea.t_overscale100 = bme280_t_overscale100(ut);
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bme280_mea.h_overscale1024 = bme280_h_overscale1024(uh);
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#ifdef BME280_64BIT
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bme280_mea.p_overscale256 = bme280_p_overscale256(up);
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#else
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bme280_mea.p = bme280_p(up);
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#endif
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#if TEST
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printf("T_BME280=%5.2f", (double)bme280_mea.t_overscale100 / 100.);
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printf(" RH_BME280=%5.2f ", (double)bme280_mea.h_overscale1024 / 1024.);
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#ifdef BME280_64BIT
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printf(" P_BME280=%5.2f\n", (double)bme280_mea.p_overscale256 / 256.);
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#else
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printf(" P_BME280=%5.2f\n", (double)bme280_mea.p);
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#endif
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#endif
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}
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