305 lines
9.1 KiB
C
305 lines
9.1 KiB
C
/*
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* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.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 copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup sensortag-cc26xx-hdc-sensor
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* @{
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*
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* \file
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* Driver for the Sensortag HDC sensor
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki-conf.h"
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#include "sys/ctimer.h"
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#include "lib/sensors.h"
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#include "hdc-1000-sensor.h"
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#include "sensor-common.h"
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#include "board-i2c.h"
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#include "ti-lib.h"
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdio.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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/* Sensor I2C address */
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#define SENSOR_I2C_ADDRESS 0x43
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/* Registers */
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#define HDC1000_REG_TEMP 0x00 /* Temperature */
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#define HDC1000_REG_HUM 0x01 /* Humidity */
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#define HDC1000_REG_CONFIG 0x02 /* Configuration */
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#define HDC1000_REG_SERID_H 0xFB /* Serial ID high */
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#define HDC1000_REG_SERID_M 0xFC /* Serial ID middle */
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#define HDC1000_REG_SERID_L 0xFD /* Serial ID low */
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#define HDC1000_REG_MANF_ID 0xFE /* Manufacturer ID */
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#define HDC1000_REG_DEV_ID 0xFF /* Device ID */
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/* Fixed values */
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#define HDC1000_VAL_MANF_ID 0x5449
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#define HDC1000_VAL_DEV_ID 0x1000
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#define HDC1000_VAL_CONFIG 0x1000 /* 14 bit, acquired in sequence */
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/* Sensor selection/deselection */
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#define SENSOR_SELECT() board_i2c_select(BOARD_I2C_INTERFACE_0, SENSOR_I2C_ADDRESS)
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#define SENSOR_DESELECT() board_i2c_deselect()
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/*---------------------------------------------------------------------------*/
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/* Byte swap of 16-bit register value */
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#define HI_UINT16(a) (((a) >> 8) & 0xFF)
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#define LO_UINT16(a) ((a) & 0xFF)
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#define SWAP(v) ((LO_UINT16(v) << 8) | HI_UINT16(v))
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/*---------------------------------------------------------------------------*/
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/* Raw data as returned from the sensor (Big Endian) */
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typedef struct sensor_data {
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uint16_t temp;
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uint16_t hum;
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} sensor_data_t;
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/* Raw data, little endian */
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static uint16_t raw_temp;
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static uint16_t raw_hum;
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/*---------------------------------------------------------------------------*/
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static bool success;
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static sensor_data_t data;
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/*---------------------------------------------------------------------------*/
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static int enabled = HDC_1000_SENSOR_STATUS_DISABLED;
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/*---------------------------------------------------------------------------*/
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/*
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* Maximum measurement durations in clock ticks. We use 14bit resolution, thus:
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* - Tmp: 6.35ms
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* - RH: 6.5ms
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*/
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#define MEASUREMENT_DURATION 2
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/*
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* Wait SENSOR_STARTUP_DELAY clock ticks between activation and triggering a
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* reading (max 15ms)
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*/
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#define SENSOR_STARTUP_DELAY 3
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static struct ctimer startup_timer;
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Initialise the humidity sensor driver
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* \return True if I2C operation successful
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*/
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static bool
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sensor_init(void)
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{
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uint16_t val;
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SENSOR_SELECT();
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/* Enable reading data in one operation */
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val = SWAP(HDC1000_VAL_CONFIG);
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success = sensor_common_write_reg(HDC1000_REG_CONFIG, (uint8_t *)&val, 2);
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SENSOR_DESELECT();
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return success;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Start measurement
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*/
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static void
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start(void)
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{
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if(success) {
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SENSOR_SELECT();
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success = board_i2c_write_single(HDC1000_REG_TEMP);
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SENSOR_DESELECT();
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Take readings from the sensor
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* \return true of I2C operations successful
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*/
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static bool
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read_data()
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{
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bool valid;
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if(success) {
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SENSOR_SELECT();
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success = board_i2c_read((uint8_t *)&data, sizeof(data));
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SENSOR_DESELECT();
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/* Store temperature */
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raw_temp = SWAP(data.temp);
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/* Store humidity */
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raw_hum = SWAP(data.hum);
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}
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valid = success;
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success = true;
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return valid;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Convert raw data to temperature and humidity
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* \param temp - converted temperature
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* \param hum - converted humidity
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*/
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static void
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convert(float *temp, float *hum)
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{
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/* Convert temperature to degrees C */
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*temp = ((double)raw_temp / 65536) * 165 - 40;
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/* Convert relative humidity to a %RH value */
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*hum = ((double)raw_hum / 65536) * 100;
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}
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/*---------------------------------------------------------------------------*/
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static void
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notify_ready(void *not_used)
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{
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enabled = HDC_1000_SENSOR_STATUS_READINGS_READY;
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/* Latch readings */
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read_data();
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sensors_changed(&hdc_1000_sensor);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Returns a reading from the sensor
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* \param type HDC_1000_SENSOR_TYPE_TEMP or HDC_1000_SENSOR_TYPE_HUMIDITY
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* \return Temperature (centi degrees C) or Humidity (centi %RH)
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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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int rv;
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float temp;
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float hum;
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if(enabled != HDC_1000_SENSOR_STATUS_READINGS_READY) {
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PRINTF("Sensor disabled or starting up (%d)\n", enabled);
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return CC26XX_SENSOR_READING_ERROR;
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}
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if((type != HDC_1000_SENSOR_TYPE_TEMP) &&
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type != HDC_1000_SENSOR_TYPE_HUMIDITY) {
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PRINTF("Invalid type\n");
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return CC26XX_SENSOR_READING_ERROR;
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} else {
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convert(&temp, &hum);
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PRINTF("HDC: %04X %04X t=%d h=%d\n", raw_temp, raw_hum,
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(int)(temp * 100), (int)(hum * 100));
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if(type == HDC_1000_SENSOR_TYPE_TEMP) {
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rv = (int)(temp * 100);
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} else if(type == HDC_1000_SENSOR_TYPE_HUMIDITY) {
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rv = (int)(hum * 100);
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}
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}
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return rv;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Configuration function for the HDC1000 sensor.
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*
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* \param type Activate, enable or disable the sensor. See below
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* \param enable
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*
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* When type == SENSORS_HW_INIT we turn on the hardware
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* When type == SENSORS_ACTIVE and enable==1 we enable the sensor
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* When type == SENSORS_ACTIVE and enable==0 we disable the sensor
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*/
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static int
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configure(int type, int enable)
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{
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switch(type) {
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case SENSORS_HW_INIT:
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raw_temp = 0;
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raw_hum = 0;
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memset(&data, 0, sizeof(data));
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sensor_init();
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enabled = HDC_1000_SENSOR_STATUS_INITIALISED;
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break;
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case SENSORS_ACTIVE:
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/* Must be initialised first */
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if(enabled == HDC_1000_SENSOR_STATUS_DISABLED) {
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return HDC_1000_SENSOR_STATUS_DISABLED;
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}
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if(enable) {
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start();
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ctimer_set(&startup_timer, SENSOR_STARTUP_DELAY, notify_ready, NULL);
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enabled = HDC_1000_SENSOR_STATUS_TAKING_READINGS;
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} else {
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ctimer_stop(&startup_timer);
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enabled = HDC_1000_SENSOR_STATUS_INITIALISED;
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}
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break;
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default:
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break;
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}
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return enabled;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Returns the status of the sensor
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* \param type SENSORS_ACTIVE or SENSORS_READY
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* \return One of the SENSOR_STATUS_xyz defines
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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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break;
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default:
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break;
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}
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return HDC_1000_SENSOR_STATUS_DISABLED;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(hdc_1000_sensor, "HDC1000", value, configure, status);
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/*---------------------------------------------------------------------------*/
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/** @} */
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