usart.h

#ifndef USART_H
#define USART_H
 
#include <iostream>
#include <cstdint>
#include <chrono>
#include <unistd.h>
#include <cstring>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <cmath>
#include "usartexception.h"
#include "timeoutexception.h"
 
class USART
{
public:
    
    /*************************************************
     * Methoden für die Verwaltung der Schnittstelle *
     *************************************************/
    
    void openDevice(std::string device);
    
    void closeDevice(void);
    
    void clearInputBuffer(void);
    
    void clearOutputBuffer(void);
    
    void flushOutputBuffer(void);
    
    void printStatistics(void);
    
    /*************************************************/
    
    
    
    /*************************************
     * Methoden für die Datenübertragung *
     *************************************/
    
    void writeByte(uint8_t b);
    
    void writeInt(uint16_t d);
    
    uint8_t readByte(void);
    
    uint16_t readInt(void);
    
    int read_timeout(uint8_t* buffer, uint16_t offset, uint8_t len, uint32_t timeout);
    int write_timeout(uint8_t* buffer, uint16_t offset, uint8_t len, uint32_t timeout);
    void writeBlock(uint8_t* buffer, uint16_t offset, uint8_t len);
    bool readBlock(uint8_t* buffer, uint16_t offset);
    
    /*************************************/
    
    
    
    /***************************************
     * Methoden für einstellbare Parameter *
     ***************************************/
    
    uint32_t getBaudrate(void);
    
    uint8_t getTimeout(void);
    
    void setBaudrate(uint32_t baudrate);
    
    void setTimeout(uint8_t timeout);
    
    /***************************************/
    
    constexpr static uint8_t CRC7_POLY = 0x91;
    constexpr static uint8_t MAX_BLOCK_SIZE = 64;
    constexpr static uint8_t BLOCK_END = 0x80;
private:
    
    int file_desc = -1; // Linux Dateideskriptor
    uint32_t baudrate = 9600; // Standard-Baudrate, sollte mit setBaudrate() überschrieben werden! 
    int TEST = 0;
    uint8_t timeout = 10; // in Dezisekunden
    uint8_t block_buffer[MAX_BLOCK_SIZE + 3];
    
    // debug statistics
    uint32_t n_blocks_total = 0;
    uint32_t n_blocks_failed = 0;
};
 
 
#endif // USART_H