contiki/platform/z1/dev/tmp102.c
2016-02-22 12:08:56 +01:00

194 lines
5.8 KiB
C

/*
* Copyright (c) 2010, Swedish Institute of Computer Science.
* Copyright (c) 2016, Zolertia <http://www.zolertia.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/*---------------------------------------------------------------------------*/
/**
* \file
* Device drivers for tmp102 temperature sensor in Zolertia Z1.
* \author
* Enric M. Calvo, Zolertia <ecalvo@zolertia.com>
* Marcus Lundén, SICS <mlunden@sics.se>
* Antonio Lignan, Zolertia <alinan@zolertia.com>
*/
/*---------------------------------------------------------------------------*/
#include <stdio.h>
#include "contiki.h"
#include "i2cmaster.h"
#include "tmp102.h"
#include "lib/sensors.h"
/*---------------------------------------------------------------------------*/
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static uint8_t enabled;
/*---------------------------------------------------------------------------*/
void
tmp102_init(void)
{
/* Power Up TMP102 via pin */
TMP102_PWR_DIR |= TMP102_PWR_PIN;
TMP102_PWR_SEL &= ~TMP102_PWR_SEL;
TMP102_PWR_SEL2 &= ~TMP102_PWR_SEL;
TMP102_PWR_REN &= ~TMP102_PWR_SEL;
TMP102_PWR_OUT |= TMP102_PWR_PIN;
/* Set up ports and pins for I2C communication */
i2c_enable();
enabled = 1;
}
/*---------------------------------------------------------------------------*/
void
tmp102_stop(void)
{
/* Power off */
TMP102_PWR_OUT &= ~TMP102_PWR_PIN;
enabled = 0;
}
/*---------------------------------------------------------------------------*/
void
tmp102_write_reg(uint8_t reg, uint16_t val)
{
uint8_t tx_buf[] = { reg, 0x00, 0x00 };
tx_buf[1] = (uint8_t)(val >> 8);
tx_buf[2] = (uint8_t)(val & 0x00FF);
i2c_transmitinit(TMP102_ADDR);
while(i2c_busy());
PRINTF("I2C Ready to TX\n");
i2c_transmit_n(3, tx_buf);
while(i2c_busy());
PRINTF("WRITE_REG 0x%04X @ reg 0x%02X\n", val, reg);
}
/*---------------------------------------------------------------------------*/
uint16_t
tmp102_read_reg(uint8_t reg)
{
uint8_t buf[] = { 0x00, 0x00 };
uint16_t retVal = 0;
uint8_t rtx = reg;
PRINTF("READ_REG 0x%02X\n", reg);
/* transmit the register to read */
i2c_transmitinit(TMP102_ADDR);
while(i2c_busy());
i2c_transmit_n(1, &rtx);
while(i2c_busy());
/* receive the data */
i2c_receiveinit(TMP102_ADDR);
while(i2c_busy());
i2c_receive_n(2, &buf[0]);
while(i2c_busy());
retVal = (uint16_t)(buf[0] << 8 | (buf[1]));
return retVal;
}
/*---------------------------------------------------------------------------*/
uint16_t
tmp102_read_temp_raw(void)
{
uint16_t rd = 0;
rd = tmp102_read_reg(TMP102_TEMP);
return rd;
}
/*---------------------------------------------------------------------------*/
int16_t
tmp102_read_temp_x100(void)
{
int16_t raw = 0;
int16_t sign = 1;
int16_t abstemp, temp_int;
raw = (int16_t)tmp102_read_reg(TMP102_TEMP);
if(raw < 0) {
abstemp = (raw ^ 0xFFFF) + 1;
sign = -1;
} else {
abstemp = raw;
}
/* Integer part of the temperature value and percents*/
temp_int = (abstemp >> 8) * sign * 100;
temp_int += ((abstemp & 0xff) * 100) / 0x100;
return temp_int;
}
/*---------------------------------------------------------------------------*/
int8_t
tmp102_read_temp_simple(void)
{
/* Casted to int8_t: We don't expect temperatures outside -128 to 127 C */
return tmp102_read_temp_x100() / 100;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
if(type != SENSORS_ACTIVE) {
return TMP102_ERROR;
}
if(value) {
tmp102_init();
} else {
tmp102_stop();
}
enabled = value;
return TMP102_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch(type) {
case SENSORS_ACTIVE:
case SENSORS_READY:
return enabled;
}
return TMP102_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
return (int)tmp102_read_temp_x100();
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(tmp102, TMP102_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/