i2c.hpp

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 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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  *   \/     /_____//_____/      \/            \/     \/            *
  *                          - Asgard -                             *
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * This software can be used by students and other personal of the *
  * Bern University of Applied Sciences under the terms of the MIT  *
  * license.                                                        *
  * For other persons this software is under the terms of the GNU   *
  * General Public License version 2.                               *
  *                                                                 *
  * Copyright © 2021, Bern University of Applied Sciences.     *
  * All rights reserved.                                            *
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#pragma once
 
#include <cpp/common/frontend/i2c.hpp>
 
#include <string>
#include <array>
 
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/i2c-dev.h>
 
namespace bsp::asg::drv {
 
    template<u16 InterfaceNumber>
    struct I2C {
 
        static bool init() {
            I2C::s_fileHandle = open(("/dev/i2c-" + std::to_string(InterfaceNumber)).c_str(), O_RDWR);
            return I2C::s_fileHandle != -1;
        }
 
        static bool deinit() {
            close(I2C::s_fileHandle);
            return true;
        }
 
        template<size_t N>
        static void read(u8 address, std::array<u8, N> &data) {
            ::ioctl(I2C::s_fileHandle, I2C_SLAVE, address >> 1);
            ::read(I2C::s_fileHandle, data.data(), N);
        }
 
        template<size_t N>
        static void write(u8 address, const std::array<u8, N> &data) {
            ::ioctl(I2C::s_fileHandle, I2C_SLAVE, address >> 1);
            ::write(I2C::s_fileHandle, data.data(), N);
        }
 
    private:
        static inline int s_fileHandle = -1;
    };
 
}