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/*
* Copyright (C) 2014 PHYTEC Messtechnik GmbH
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*
*/
/**
* @ingroup drivers_hdc1000
* @{
*
* @file
* @brief Driver for the TI HDC1000 Humidity and Temperature Sensor.
*
* @author Johann Fischer <j.fischer@phytec.de>
*
* @}
*/
#include <stdint.h>
#include <stdbool.h>
#include "periph/i2c.h"
#include "hdc1000.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
/**
* @brief Register Map
*/
#define HDC1000_TEMPERATURE 0x00
#define HDC1000_HUMIDITY 0x01
#define HDC1000_CONFG 0x02
#define HDCD1000_SID1 0xFB
#define HDCD1000_SID2 0xFC
#define HDCD1000_SID3 0xFD
#define HDC1000_MANUFACTURER_ID 0xFE
#define HDC1000_DEVICE_ID 0xFF
/**
* @brief Configuration Register Description
*/
#define HDC1000_CONFG_RST (1 << 15)
#define HDC1000_CONFG_HEAT (1 << 13)
#define HDC1000_CONFG_SEQ_MOD (1 << 12)
#define HDC1000_CONFG_BTST_LOW (1 << 11)
#define HDC1000_CONFG_TRES_MSK (1 << 10)
#define HDC1000_CONFG_TRES_11 (1 << 10)
#define HDC1000_CONFG_TRES_14 0
#define HDC1000_CONFG_HRES_MSK (1 << 9 | 1 << 8)
#define HDC1000_CONFG_HRES_14 0
#define HDC1000_CONFG_HRES_11 (1 << 8)
#define HDC1000_CONFG_HRES_8 (1 << 9)
/**
* @brief Manufacturer and Device ID
*/
#define HDC1000_MID_VALUE 0x5449
#define HDC1000_DID_VALUE 0x1000
#define I2C_SPEED I2C_SPEED_FAST
int hdc1000_test(hdc1000_t *dev)
{
uint8_t reg[2];
uint16_t tmp;
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, HDC1000_MANUFACTURER_ID, reg, 2) != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
tmp = ((uint16_t)reg[0] << 8) | reg[1];
if (tmp != HDC1000_MID_VALUE) {
return -1;
}
return 0;
}
int hdc1000_init(hdc1000_t *dev, i2c_t i2c, uint8_t address)
{
uint8_t reg[2];
/* write device descriptor */
dev->i2c = i2c;
dev->addr = address;
dev->initialized = false;
i2c_acquire(dev->i2c);
/* initialize the I2C bus */
if (i2c_init_master(i2c, I2C_SPEED) < 0) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
if (hdc1000_test(dev)) {
return -2;
}
/* set 14 bit resolution for both sensors and sequence mode */
uint16_t tmp = HDC1000_CONFG_SEQ_MOD;
reg[0] = (tmp >> 8);
reg[1] = tmp;
i2c_acquire(dev->i2c);
if (i2c_write_regs(dev->i2c, dev->addr, HDC1000_CONFG, reg, 2) != 2) {
i2c_release(dev->i2c);
return -3;
}
dev->initialized = true;
i2c_release(dev->i2c);
return 0;
}
int hdc1000_reset(hdc1000_t *dev)
{
uint8_t reg[2];
uint16_t tmp = HDC1000_CONFG_RST;
reg[0] = (tmp >> 8);
reg[1] = tmp;
dev->initialized = false;
i2c_acquire(dev->i2c);
if (i2c_write_regs(dev->i2c, dev->addr, HDC1000_CONFG, reg, 2) != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int hdc1000_startmeasure(hdc1000_t *dev)
{
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
/* Trigger the measurements by executing a write access
* to the address 0x00 (HDC1000_TEMPERATURE).
* Conversion Time is 6.50ms by 14 bit resolution.
*/
if (i2c_write_byte(dev->i2c, dev->addr, HDC1000_TEMPERATURE) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int hdc1000_read(hdc1000_t *dev, uint16_t *rawtemp, uint16_t *rawhum)
{
uint8_t buf[4];
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_bytes(dev->i2c, dev->addr, buf, 4) != 4) {
i2c_release(dev->i2c);
return -1;
}
/* Register bytes are sent MSB first. */
*rawtemp = ((uint16_t)buf[0] << 8) | buf[1];
*rawhum = ((uint16_t)buf[2] << 8) | buf[3];
i2c_release(dev->i2c);
return 0;
}
void hdc1000_convert(uint16_t rawtemp, uint16_t rawhum, int *temp, int *hum)
{
/* calculate temperature*100 [°C] */
*temp = (int)((((int32_t)rawtemp * 16500) >> 16) - 4000);
DEBUG("hdc1000 : T: %d\n", *temp);
/* calculate relative humidity*100 [%RH] */
*hum = (int)(((int32_t)rawhum * 10000) >> 16);
DEBUG("hdc1000 : RH: %d\n", *hum);
}
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