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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

#define BAUDRATE B9600
#define DEVICE "/dev/ttyUSB0"
#define _POSIX_SOURCE 1

int main(int argc, char **argv)
{
    int fd, i, res;
    struct termios oldtio,newtio;
    char buf[255];
    char cmd;

    fd = open(DEVICE, O_RDWR | O_NOCTTY);
    if(fd < 0)
    {
        perror(DEVICE);
        exit(-1);
    }
    printf("deviced opened\n");

    // get old settings
    if(tcgetattr(fd, &oldtio) < 0)
    {
        printf("error getting old serial settings\n");
        exit(-1);
    }
    printf("got old settings\n");

    // set up new settings
    bzero(&newtio, sizeof(newtio));
    newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;
    newtio.c_iflag = IGNPAR;
    newtio.c_oflag = 0;
    newtio.c_lflag = 0;
    newtio.c_cc[VTIME]    = 0;   /* inter-character timer unused */
    newtio.c_cc[VMIN]     = 1;   /* blocking read until 5 chars received */

    if(tcflush(fd, TCIOFLUSH) < 0)
    {
        printf("failed to flush serial device\n");
        exit(-1);
    }
    printf("device flushed\n");

    // set new settings
    if(tcsetattr(fd, TCSANOW, &newtio) < 0)
    {
        printf("failed to set new settings\n");
    }
    printf("new settings\n");

    // write the nesinfo command
    cmd = 0xA1;
    res = write(fd, &cmd, 1);
    if(tcdrain(fd) < 0)
    {
        printf("failed to send data\n");
    }
    printf("wrote %d bytes\n", res);

    // read the nesinfo command results
    bzero(buf, 255);
    for(i = 0; i < 255; i++)
    {
        printf("%d\n", i);
        res = read(fd, &buf[i], 1);
        if(res <= 0)
        {
            buf[i] = 0;
            break;
        }
    }
    printf("%s\n", buf);

    // restore old settings
    tcsetattr(fd, TCSANOW, &oldtio);

    return EXIT_SUCCESS;
}