File content as of revision 2:3116fe4a0079:

/* A library for STMicroelectronics STTS751 I2C temperature sensor
 * Copyright 2014, Takuo WATANABE (wtakuo)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "STTS751.h"

#define SET_BITS(x,m,b) (((x) & !(m)) | (b))

STTS751::STTS751(PinName sda, PinName scl, Address addr, Model model): _i2c(sda, scl), _addr(addr | model)
{
    init();
}

STTS751::STTS751(I2C &i2c, Address addr, Model model): _i2c(i2c), _addr(addr | model)
{
    init();
}

void STTS751::init()
{
    write8(REG_CONFIGURATION, 0x00);
    write8(REG_CONV_RATE, 0x04);
}

int STTS751::addr() {
    return _addr;
}

STTS751::Resolution STTS751::resolution() {
    char conf = read8(REG_CONFIGURATION);
    return (STTS751::Resolution)(conf & RES_MASK);
}

void STTS751::setResolution(STTS751::Resolution res) {
    char conf = read8(REG_CONFIGURATION);
    conf = SET_BITS(conf, RES_MASK, res);
    write8(REG_CONFIGURATION, conf);
}

float STTS751::temp()
{
    signed char h = read8(REG_TEMPERATURE_H);
    unsigned char l = read8(REG_TEMPERATURE_L);
    return ((h << 8) | l) / 256.0;
}

#ifdef MBED_OPERATORS
STTS751::operator float()
{
    return temp();
}
#endif

char STTS751::read8(char reg) {
    _i2c.write(_addr, &reg, 1, true);
    _i2c.read(_addr, &reg, 1);
    return reg;
}

void STTS751::write8(char reg, char data) {
    char buff[2] = { reg, data };
    _i2c.write(_addr, buff, 2);
}