361 lines
10 KiB
C
361 lines
10 KiB
C
/*
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* Copyright (c) 2015, Zolertia - http://www.zolertia.com
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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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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup zoul-bmpx8x-sensor
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* @{
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*
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* BMP085/BMP180 driver implementation
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*
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* \file
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* Driver for the external BMP085/BMP180 atmospheric pressure sensor
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*
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* \author
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* Antonio Lignan <alinan@zolertia.com>
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "dev/i2c.h"
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#include "dev/gpio.h"
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#include "dev/zoul-sensors.h"
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#include "lib/sensors.h"
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#include "bmpx8x.h"
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/*---------------------------------------------------------------------------*/
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static uint8_t enabled = 0;
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/*---------------------------------------------------------------------------*/
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typedef struct {
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int16_t ac1;
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int16_t ac2;
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int16_t ac3;
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uint16_t ac4;
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uint16_t ac5;
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uint16_t ac6;
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int16_t b1;
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int16_t b2;
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int16_t mb;
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int16_t mc;
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int16_t md;
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} bmpx8x_calibration_values;
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typedef struct {
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uint8_t oversampling_mode;
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int32_t b5;
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bmpx8x_calibration_values calib;
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} bmpx8x_config;
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static bmpx8x_config bmpx8x_values;
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_read_reg(uint8_t reg, uint8_t *buf, uint8_t num)
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{
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if((buf == NULL) || (num <= 0)) {
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PRINTF("BMPx8x: invalid read values\n");
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return BMPx8x_ERROR;
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}
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i2c_master_enable();
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if(i2c_single_send(BMPx8x_ADDR, reg) == I2C_MASTER_ERR_NONE) {
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while(i2c_master_busy());
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if(i2c_burst_receive(BMPx8x_ADDR, buf, num) == I2C_MASTER_ERR_NONE) {
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return BMPx8x_SUCCESS;
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}
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}
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_write_reg(uint8_t *buf, uint8_t num)
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{
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if((buf == NULL) || (num <= 0)) {
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PRINTF("BMPx8x: invalid write values\n");
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return BMPx8x_ERROR;
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}
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i2c_master_enable();
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if(i2c_burst_send(BMPx8x_ADDR, buf, num) == I2C_MASTER_ERR_NONE) {
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return BMPx8x_SUCCESS;
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}
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_read_calib(void)
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{
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uint8_t buf[BMPx8x_CALIB_TABLE_SIZE];
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if(bmpx8x_read_reg(BMPx8x_AC1_CALIB, buf,
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BMPx8x_CALIB_TABLE_SIZE) == BMPx8x_SUCCESS) {
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/* MSB first */
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bmpx8x_values.calib.ac1 = ((buf[0] << 8) + buf[1]);
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bmpx8x_values.calib.ac2 = ((buf[2] << 8) + buf[3]);
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bmpx8x_values.calib.ac3 = ((buf[4] << 8) + buf[5]);
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bmpx8x_values.calib.ac4 = ((buf[6] << 8) + buf[7]);
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bmpx8x_values.calib.ac5 = ((buf[8] << 8) + buf[9]);
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bmpx8x_values.calib.ac6 = ((buf[10] << 8) + buf[11]);
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bmpx8x_values.calib.b1 = ((buf[12] << 8) + buf[13]);
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bmpx8x_values.calib.b2 = ((buf[14] << 8) + buf[15]);
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bmpx8x_values.calib.mb = ((buf[16] << 8) + buf[17]);
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bmpx8x_values.calib.mc = ((buf[18] << 8) + buf[19]);
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bmpx8x_values.calib.md = ((buf[20] << 8) + buf[21]);
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return BMPx8x_SUCCESS;
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}
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PRINTF("BMPx8x: failed to read calibration\n");
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_read_uncompensated_pressure(int32_t *pressure)
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{
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uint8_t buf[3];
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uint16_t delay;
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int32_t upres;
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buf[0] = BMPx8x_CTRL_REG;
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switch(bmpx8x_values.oversampling_mode) {
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case BMPx8x_MODE_ULTRA_LOW_POWER:
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buf[1] = BMPx8x_CTRL_REG_PRESS_4_5MS;
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delay = BMPx8x_DELAY_4_5MS;
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break;
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case BMPx8x_MODE_STANDARD:
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buf[1] = BMPx8x_CTRL_REG_PRESS_7_5MS;
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delay = BMPx8x_DELAY_7_5MS;
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break;
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case BMPx8x_MODE_HIGH_RES:
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buf[1] = BMPx8x_CTRL_REG_PRESS_13_5MS;
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delay = BMPx8x_DELAY_13_5MS;
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break;
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case BMPx8x_MODE_ULTRA_HIGH_RES:
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buf[1] = BMPx8x_CTRL_REG_PRESS_25_5MS;
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delay = BMPx8x_DELAY_25_5MS;
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break;
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default:
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return BMPx8x_ERROR;
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}
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if(bmpx8x_write_reg(buf, 2) == BMPx8x_SUCCESS) {
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clock_delay_usec(delay);
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if(bmpx8x_read_reg(BMPx8x_DATA_MSB, buf, 3) == BMPx8x_SUCCESS) {
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upres = (buf[0] << 16) + (buf[1] << 8) + buf[2];
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*pressure = (upres >> (8 - bmpx8x_values.oversampling_mode));
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return BMPx8x_SUCCESS;
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}
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}
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_read_uncompensated_temperature(int32_t *temp)
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{
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uint8_t buf[2];
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buf[0] = BMPx8x_CTRL_REG;
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buf[1] = BMPx8x_CTRL_REG_TEMP;
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if(bmpx8x_write_reg(buf, 2) == BMPx8x_SUCCESS) {
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clock_delay_usec(BMPx8x_DELAY_4_5MS);
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if(bmpx8x_read_reg(BMPx8x_DATA_MSB, buf, 2) == BMPx8x_SUCCESS) {
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*temp = (int32_t)((buf[0] << 8) + buf[1]);
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return BMPx8x_SUCCESS;
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}
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}
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_read_temperature(int16_t *temp)
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{
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int32_t ut = 0;
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int32_t x1, x2;
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if(bmpx8x_read_uncompensated_temperature(&ut) == BMPx8x_ERROR) {
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return BMPx8x_ERROR;
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}
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x1 = ((int32_t)ut - (int32_t)bmpx8x_values.calib.ac6)
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* (int32_t)bmpx8x_values.calib.ac5 >> 15;
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x2 = ((int32_t)bmpx8x_values.calib.mc << 11) / (x1 + bmpx8x_values.calib.md);
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bmpx8x_values.b5 = x1 + x2;
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*temp = (int16_t)((bmpx8x_values.b5 + 8) >> 4);
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return BMPx8x_SUCCESS;
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}
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_read_pressure(int32_t *pressure)
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{
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int32_t ut = 0;
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int32_t up = 0;
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int32_t x1, x2, b6, x3, b3, p;
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uint32_t b4, b7;
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if(bmpx8x_read_uncompensated_pressure(&up) == BMPx8x_ERROR) {
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return BMPx8x_ERROR;
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}
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if(bmpx8x_read_uncompensated_temperature(&ut) == BMPx8x_ERROR) {
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return BMPx8x_ERROR;
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}
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b6 = bmpx8x_values.b5 - 4000;
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x1 = (bmpx8x_values.calib.b2 * (b6 * b6 >> 12)) >> 11;
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x2 = bmpx8x_values.calib.ac2 * b6 >> 11;
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x3 = x1 + x2;
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b3 = ((((int32_t)bmpx8x_values.calib.ac1) * 4 + x3) + 2) >> 2;
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x1 = (bmpx8x_values.calib.ac3 * b6) >> 13;
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x2 = (bmpx8x_values.calib.b1 * ((b6 * b6) >> 12)) >> 16;
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x3 = ((x1 + x2) + 2) >> 2;
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b4 = (bmpx8x_values.calib.ac4 * ((uint32_t)(x3 + 32768))) >> 15;
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b7 = ((uint32_t)up - b3) * 50000;
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if(b7 < 0x80000000) {
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p = (b7 << 1) / b4;
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} else {
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p = (b7 / b4) << 1;
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}
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x1 = (p >> 8) * (p >> 8);
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x1 = (x1 * 3038) >> 16;
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x2 = (-7357 * p) >> 16;
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*pressure = (p + ((x1 + x2 + 3791) >> 4));
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*pressure /= 10;
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return BMPx8x_SUCCESS;
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int value)
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{
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if((type != BMPx8x_ACTIVE) && (type != BMPx8x_OVERSAMPLING)) {
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PRINTF("BMPx8x: invalid start value\n");
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return BMPx8x_ERROR;
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}
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if(type == BMPx8x_ACTIVE) {
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if(value) {
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i2c_init(I2C_SDA_PORT, I2C_SDA_PIN, I2C_SCL_PORT, I2C_SCL_PIN,
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I2C_SCL_NORMAL_BUS_SPEED);
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/* Read the calibration values */
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if(bmpx8x_read_calib() != BMPx8x_ERROR) {
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PRINTF("BMPx8x: sensor started\n");
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enabled = 1;
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bmpx8x_values.oversampling_mode = BMPx8x_MODE_ULTRA_LOW_POWER;
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return BMPx8x_SUCCESS;
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}
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PRINTF("BMPx8x: failed to enable\n");
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return BMPx8x_ERROR;
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} else {
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enabled = 0;
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return BMPx8x_SUCCESS;
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}
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} else if(type == BMPx8x_OVERSAMPLING) {
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if((value < BMPx8x_MODE_ULTRA_LOW_POWER) ||
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(value > BMPx8x_MODE_ULTRA_HIGH_RES)) {
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PRINTF("BMPx8x: invalid oversampling value\n");
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return BMPx8x_ERROR;
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}
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bmpx8x_values.oversampling_mode = value;
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return BMPx8x_SUCCESS;
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}
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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switch(type) {
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case SENSORS_ACTIVE:
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case SENSORS_READY:
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return enabled;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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bmpx8x_read_sensor(int32_t *value, uint8_t type)
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{
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int16_t temp = 0;
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/* The temperature is required to compensate the pressure value */
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if(bmpx8x_read_temperature(&temp) != BMPx8x_SUCCESS) {
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return BMPx8x_ERROR;
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}
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switch(type) {
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case BMPx8x_READ_PRESSURE:
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return bmpx8x_read_pressure(value);
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case BMPx8x_READ_TEMP:
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*value = (int16_t) temp;
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return BMPx8x_SUCCESS;
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}
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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int32_t value;
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if(!enabled) {
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PRINTF("BMPx8x: sensor not started\n");
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return BMPx8x_ERROR;
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}
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if((type != BMPx8x_READ_PRESSURE) && (type != BMPx8x_READ_TEMP)) {
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PRINTF("BMPx8x: invalid read value\n");
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return BMPx8x_ERROR;
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}
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if(bmpx8x_read_sensor(&value, type) == BMPx8x_SUCCESS) {
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return (int)value;
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}
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PRINTF("BMPx8x: fail to read\n");
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return BMPx8x_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(bmpx8x, BMPx8x_SENSOR, value, configure, status);
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/*---------------------------------------------------------------------------*/
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/** @} */
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