i2c.hpp

/*
 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
 * Copyright (c) 2014 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 "i2c.h"
#include "types.hpp"
#include <stdexcept>

namespace mraa
{

class I2c
{
  public:
    I2c(int bus, bool raw = false)
    {
        if (raw) {
            m_i2c = mraa_i2c_init_raw(bus);
        } else {
            m_i2c = mraa_i2c_init(bus);
        }
        if (m_i2c == NULL) {
            throw std::invalid_argument("Invalid i2c bus");
        }
    }
    I2c(void* i2c_context)
    {
        m_i2c = (mraa_i2c_context) i2c_context;
        if (m_i2c == NULL) {
            throw std::invalid_argument("Invalid I2C context");
        }
    }

    ~I2c()
    {
        mraa_i2c_stop(m_i2c);
    }

    Result
    frequency(I2cMode mode)
    {
        return (Result) mraa_i2c_frequency(m_i2c, (mraa_i2c_mode_t) mode);
    }

    Result
    address(uint8_t address)
    {
        return (Result) mraa_i2c_address(m_i2c, address);
    }

    uint8_t
    readByte()
    {
        int x = mraa_i2c_read_byte(m_i2c);
        if (x == -1) {
            throw std::invalid_argument("Unknown error in I2c::readByte()");
        }
        return (uint8_t) x;
    }

    int
    read(uint8_t* data, int length)
    {
        return mraa_i2c_read(m_i2c, data, length);
    }

    uint8_t
    readReg(uint8_t reg)
    {
        int x = mraa_i2c_read_byte_data(m_i2c, reg);
        if (x == -1) {
            throw std::invalid_argument("Unknown error in I2c::readReg()");
        }
        return (uint8_t) x;
    }

    uint16_t
    readWordReg(uint8_t reg)
    {
        int x = mraa_i2c_read_word_data(m_i2c, reg);
    if (x == -1) {
            throw std::invalid_argument("Unknown error in I2c::readReg()");
        }
        return (uint16_t) x;
    }

    int
    readBytesReg(uint8_t reg, uint8_t* data, int length)
    {
        return mraa_i2c_read_bytes_data(m_i2c, reg, data, length);
    }

    Result
    writeByte(uint8_t data)
    {
        return (Result) mraa_i2c_write_byte(m_i2c, data);
    }

    Result
    write(const uint8_t* data, int length)
    {
        return (Result) mraa_i2c_write(m_i2c, data, length);
    }

    Result
    writeReg(uint8_t reg, uint8_t data)
    {
        return (Result) mraa_i2c_write_byte_data(m_i2c, data, reg);
    }

    Result
    writeWordReg(uint8_t reg, uint16_t data)
    {
        return (Result) mraa_i2c_write_word_data(m_i2c, data, reg);
    }

  private:
    mraa_i2c_context m_i2c;
};
}