spi.h

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// Copyright (C) 2021 twyleg
#pragma once
 
#include <linux/spi/spidev.h>
 
#include <chrono>
#include <string>
#include <cstdint>
#include <cstddef>
#include <iostream>
 
namespace spidevpp {
 
class Spi {
 
public:
 
    explicit Spi(const std::string& device);
 
    void setBitsPerWord(uint8_t bitsPerWord);
    uint8_t getBitsPerWord() const;
 
    void setSpeed(uint32_t speed);
    uint32_t getSpeed() const;
 
    void setMode(uint32_t mode);
    uint32_t getMode() const;
 
    void setDelay(std::chrono::microseconds);
    std::chrono::microseconds getDelay() const;
 
    void write(char* pData, size_t len);
    void read(char* pData, size_t len);
    void writeRead(char* pData, size_t len);
    char writeRead(char data);
 
    template <class Stream>
    friend Stream& operator<<(Stream& out, const Spi&);
 
private:
 
    const std::string mDevice;
 
    int mFd;
    uint8_t mBitsPerWord = 8;
    std::chrono::microseconds mDelay = std::chrono::microseconds(0);
    uint32_t mMode = 0;
    uint32_t mSpeed = 500000;
 
};
 
template <class Stream>
Stream& operator<<(Stream& out, const Spi& spi)
{
    out << "SPI " << spi.mDevice << std::endl;
    out << "\tMode: " << spi.getMode() << std::endl;
    out << "\tSpeed [Hz]: " << spi.getSpeed() << std::endl;
    out << "\tWord length [bits]: " << static_cast<int>(spi.getBitsPerWord()) << std::endl;
    out << "\tDelay [us]: " << spi.getDelay().count() << std::endl;
 
    return out;
}
 
}