mcp9808.hpp

/*
 * Author: Marc Graham <marc@m2ag.net>
 * Copyright (c) 2015 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */



#pragma once

#include <iostream>
#include <string>
#include "mraa.hpp"
#include "mraa/i2c.hpp"

#define MCP9808_REG_CONFIG  0x01
#define MCP9808_REG_AMBIENT_TEMP 0x05
#define MCP9808_REG_MANUF_ID 0x06
#define MCP9808_REG_DEVICE_ID 0x07
#define MCP9808_REG_RESOLUTION 0x08
#define MCP9808_CONFIG_SHUTDOWN 0x0001
#define MCP9808_CONFIG_CRITLOCKED 0x8000
#define MCP9808_CONFIG_WINLOCKED 0x4000
#define MCP9808_CONFIG_INTCLR 0x2000

namespace upm {
    class MCP9808 {

        public:
            typedef enum
            {
                 UPPER_TEMP = 0x02,
                 LOWER_TEMP = 0x03,
                 CRIT_TEMP = 0x04,
            } MCP9808_REG;

            typedef enum
            {
                RES_LOW = 0x00,
                RES_MEDIUM = 0x01,
                RES_HIGH = 0x02,
                RES_PRECISION = 0x03
            } MCP9808_RESOLUTION;

            typedef enum
            {
                ALERTSTAT = 0x1000,
                ALERTCTRL = 0x0800,
                ALERTSEL = 0x0400,
                ALERTPOL = 0x0200,
                ALERTMODE = 0x0100,
                HYST_0 = 0x0000,
                HYST_1_5 = 0x0002,
                HYST_3_0 = 0x0004,
                HYST_6_0 = 0x0006
            } MCP9808_CONFIG;

            MCP9808 (int bus, uint8_t address = 0x18);

            ~MCP9808 ();

            std::string name()
            {
                return m_name;
            }

            float getTemp(void);

             void shutDown(bool sleep = true);

            void setMode(bool celsius = true)
            {
                m_celsius = celsius;
            }

            bool isCelsius(void)
            {
                return m_celsius;
            }

            bool isTcrit()
            {
                return m_tcrit;
            }

            bool isTupper()
            {
                return m_tupper;
            }

            bool isTlower()
            {
                return m_tlower;
            }

            void setMonitorReg(MCP9808_REG reg, float value);

            float getMonitorReg(MCP9808_REG reg);

            void clearInterrupt(void);

            void setAlertMode(uint16_t command);

            void clearAlertMode(void);

            void setHysteresis(MCP9808_CONFIG value);

            float getHysteresis();

            void setResolution(MCP9808_RESOLUTION value);

            float getResolution();

            uint16_t getManufacturer();

            uint16_t getDevicedId();

        private:
            std::string m_name;
            bool m_celsius;
            bool m_tcrit;
            bool m_tupper;
            bool m_tlower;

            mraa::I2c* i2c;

            float getTempValue(uint16_t value);
            void updateConfigRegister(uint16_t update, bool on = true);
            uint16_t swapWord(uint16_t value);
    };
}