#include <iostream>
#include <errno.h>
#include <stropts.h>
#include <fcntl.h>

#include <si4713.h>
#include <asm/ioctl.h>

//warning testing only...
//some missing error handling around ;)


int main (int argc, char *argv[]) //argc = number of arguments (including program name!), argv = list of strings

{
    if (argc < 2) //check if argument for frequenzy is given
        {
            printf("Need frequency argument\n");

            return -EINVAL;
        }

    int fd = open("/dev/radio0", O_RDWR); //opens "file" /deve/radio with reading and writing flag (O_RDWR)
    perror ("Opening /dev/radio0:");

    if (fd < 0) //if opening of file fails:
        {
            close(fd); //close file

            return fd;
        }


    struct si4713_rnl rnl; //define structure rnl as si4713_rnl
    int rval; //variable for noise level


    sscanf(argv[1], "%d", &rnl.frequency); //writes the string to int convertet frequency argument to rnl.frequenzy (& = no pinter)
    //Missing error handling?


    rval = ioctl(fd, SI4713_IOC_MEASURE_RNL, &rnl);
    perror ("Optaining noise Level:");

    if (rval < 0)
        {
        close(fd);

        return rval;
        }


    printf("received noise level: %d\n", rval);



    close(fd);

}