#include <iostream>
#include <stdio.h>
#include <string.h>

#include <fcntl.h> // Contains file controls like O_RDWR
#include <errno.h> // Error integer and strerror() function
#include <termios.h> // Contains POSIX terminal control definitions
#include <unistd.h> // write(), read(), close()


using namespace std;

class PowerSupplyOp {
    public:

    float V_conversion=1.812*10**(-3);  //voltage conversion factor
    float I_conversion=4.980*10**(-3);   //current conversion factor (mA)
    char STX[] = "02";          //start of text - fixed
    char ETX[] = "03";          //end of text - fixed
    char CR[] = "0D";           //delimiter - fixed


    char convert(char command) //convert command to hexadecimal and get a bytearray sum??
    {


    }

    char checksum(char sum_command, double sum_voltage) //necessary for communication with power supply
    {


    }



    void start() //Connect to the Power supply
    {
        ser = open("/dev/ttyUSB0", O_RDWR);
        if (ser <0){
            printf("Error %i from open: %s\n", errno, strerror(errno));
        }

        // Create new termios struc to set configuration
        struct termios tty;
        memset(&tty, 0, sizeof tty);

        // Read in existing settings, and handle any error
        if(tcgetattr(serial_port, &tty) != 0) {
            printf("Error %i from tcgetattr: %s\n", errno, strerror(errno));
        }
        tty.c_cflag |= PARENB;  // Set parity bit, enabling parity

        tty.c_cflag &= ~CSTOPB; // One stop bit used in communication

        tty.c_cflag |= CS8; // 8 bits per byte

        // Set baud rate
        cfsetispeed(&tty, B38400);
        cfsetospeed(&tty, B38400);

        // Save tty settings, also checking for error
        if (tcsetattr(serial_port, TCSANOW, &tty) != 0) {
            printf("Error %i from tcsetattr: %s\n", errno, strerror(errno));
        }}


    void stop() //disconnect from the Power supply
    {
        close(ser)
    }

    char convert()


    std::vector<double> getVolt() //outputs the Voltage for the four channels (same value for all channels), similar to getValue
    {

    }

    std::vector<double> getCurr() //outputs the Current for the four channels (same value for all channels)
    {

    }


    void loadConfig(double u0) //sets the voltage, similar to setValue
    {

    }

};


int main () {



  return 0;
}