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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_tmp006
* @{
*
* @file
* @brief Driver for the TI TMP006 Infrared Thermopile Sensor.
*
* @author Johann Fischer <j.fischer@phytec.de>
* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
*
* @}
*/
#include <stdint.h>
#include <stdbool.h>
#include <math.h>
#include "periph/i2c.h"
#include "tmp006.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define TMP006_V_OBJECT 0x00 /**< Sensor Voltage Register */
#define TMP006_T_AMBIENT 0x01 /**< Ambient Temperature Register */
#define TMP006_CONFIG 0x02 /**< Configuration Register */
#define TMP006_MANUFACTURER_ID 0xFE /**< Manufacturer ID Register */
#define TMP006_DEVICE_ID 0xFF /**< Device ID Register */
#define TMP006_CONFIG_RST (1 << 15)
#define TMP006_CONFIG_MOD_SHIFT 12
#define TMP006_CONFIG_MOD_MASK 0x7000
#define TMP006_CONFIG_MOD(x) (((uint16_t)(((uint16_t)(x))<<TMP006_CONFIG_MOD_SHIFT))\
&TMP006_CONFIG_MOD_MASK)
#define TMP006_CONFIG_MOD_CC 0x07
#define TMP006_CONFIG_MOD_OFF 0x00
#define TMP006_CONFIG_CR_SHIFT 9
#define TMP006_CONFIG_CR_MASK 0x0E00
#define TMP006_CONFIG_CR(x) (((uint16_t)(((uint16_t)(x))<<TMP006_CONFIG_CR_SHIFT))\
&TMP006_CONFIG_CR_MASK)
#define TMP006_CONFIG_DRDY_PIN_EN (1 << 8)
#define TMP006_CONFIG_DRDY (1 << 7)
#define TMP006_MID_VALUE 0x5449 /**< Manufacturer ID */
#define TMP006_DID_VALUE 0x0067 /**< Device ID */
#define I2C_SPEED I2C_SPEED_FAST
int tmp006_test(tmp006_t *dev)
{
int status;
uint8_t reg[2];
uint16_t tmp;
/* Acquire exclusive access to the bus. */
i2c_acquire(dev->i2c);
status = i2c_read_regs(dev->i2c, dev->addr, TMP006_DEVICE_ID, reg, 2);
if (status != 2) {
/* Release the bus for other threads. */
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
tmp = ((uint16_t)reg[0] << 8) | reg[1];
if (tmp != TMP006_DID_VALUE) {
return -1;
}
return 0;
}
int tmp006_init(tmp006_t *dev, i2c_t i2c, uint8_t address, uint8_t conv_rate)
{
int status;
uint8_t reg[2];
/* write device descriptor */
dev->i2c = i2c;
dev->addr = address;
dev->initialized = false;
if (conv_rate > TMP006_CONFIG_CR_AS16) {
return -1;
}
i2c_acquire(dev->i2c);
/* initialize the I2C bus */
status = i2c_init_master(i2c, I2C_SPEED);
if (status < 0) {
i2c_release(dev->i2c);
return -2;
}
i2c_release(dev->i2c);
if (tmp006_test(dev)) {
return -3;
}
uint16_t tmp = TMP006_CONFIG_CR(conv_rate);
reg[0] = (tmp >> 8);
reg[1] = tmp;
/* Acquire exclusive access to the bus. */
i2c_acquire(dev->i2c);
status = i2c_write_regs(dev->i2c, dev->addr, TMP006_CONFIG, reg, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -4;
}
i2c_release(dev->i2c);
dev->initialized = true;
return 0;
}
int tmp006_reset(tmp006_t *dev)
{
int status;
uint8_t reg[2];
uint16_t tmp = TMP006_CONFIG_RST;
reg[0] = (tmp >> 8);
reg[1] = tmp;
dev->initialized = false;
/* Acquire exclusive access to the bus. */
i2c_acquire(dev->i2c);
status = i2c_write_regs(dev->i2c, dev->addr, TMP006_CONFIG, reg, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int tmp006_set_active(tmp006_t *dev)
{
int status;
uint8_t reg[2];
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
status = i2c_read_regs(dev->i2c, dev->addr, TMP006_CONFIG, reg, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
reg[0] |= (TMP006_CONFIG_MOD(TMP006_CONFIG_MOD_CC) >> 8);
status = i2c_write_regs(dev->i2c, dev->addr, TMP006_CONFIG, reg, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int tmp006_set_standby(tmp006_t *dev)
{
int status;
uint8_t reg[2];
i2c_acquire(dev->i2c);
status = i2c_read_regs(dev->i2c, dev->addr, TMP006_CONFIG, reg, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
reg[0] &= ~(TMP006_CONFIG_MOD(TMP006_CONFIG_MOD_CC) >> 8);
i2c_acquire(dev->i2c);
status = i2c_write_regs(dev->i2c, dev->addr, TMP006_CONFIG, reg, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int tmp006_read(tmp006_t *dev, int16_t *rawv, int16_t *rawt, uint8_t *drdy)
{
int status;
uint8_t buf[2];
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
/* Register bytes are sent MSB first. */
status = i2c_read_regs(dev->i2c, dev->addr, TMP006_CONFIG, buf, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
*drdy = buf[1] & (TMP006_CONFIG_DRDY);
if (!(*drdy)) {
/* conversion in progress */
return -1;
}
i2c_acquire(dev->i2c);
status = i2c_read_regs(dev->i2c, dev->addr, TMP006_V_OBJECT, buf, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
*rawv = ((uint16_t)buf[0] << 8) | buf[1];
i2c_acquire(dev->i2c);
status = i2c_read_regs(dev->i2c, dev->addr, TMP006_T_AMBIENT, buf, 2);
if (status != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
*rawt = ((uint16_t)buf[0] << 8) | buf[1];
return 0;
}
void tmp006_convert(int16_t rawv, int16_t rawt, float *tamb, float *tobj)
{
/* calculate die temperature */
*tamb = (double)rawt / 128.0;
/* die temperature in Kelvin */
double tdie_k = *tamb + 273.15;
/* calculate sensor voltage */
double sens_v = (double)rawv * TMP006_CCONST_LSB_SIZE;
double tdiff = tdie_k - TMP006_CCONST_TREF;
double tdiff_pow2 = pow(tdiff, 2);
double s = TMP006_CCONST_S0 * (1 + TMP006_CCONST_A1 * tdiff
+ TMP006_CCONST_A2 * tdiff_pow2);
double v_os = TMP006_CCONST_B0 + TMP006_CCONST_B1 * tdiff
+ TMP006_CCONST_B2 * tdiff_pow2;
double f_obj = (sens_v - v_os) + TMP006_CCONST_C2 * pow((sens_v - v_os), 2);
double t = pow(pow(tdie_k, 4) + (f_obj / s), 0.25);
/* calculate object temperature in Celsius */
*tobj = (t - 273.15);
}
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