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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    dumpuart.cpp

//

// Project:     CMod S6 System on a Chip, ZipCPU demonstration project

//

// Purpose:     To produce any and all data from the UART port onto an output

//              pipe and/or an output file.  This replaces the minicom

//      interface.  This is necessary because 1) minicom can take a while to

//      set up, 2) the default interface is at 9600 Baud (not minicom's 

//      default), 3) this produces an unfiltered/unbuffered terminal output,

//      and 4) it also guarantees that output goes to a file (when requested).

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2015-2016, Gisselquist Technology, LLC

//

// This program is free software (firmware): you can redistribute it and/or

// modify it under the terms of  the GNU General Public License as published

// by the Free Software Foundation, either version 3 of the License, or (at

// your option) any later version.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

////////////////////////////////////////////////////////////////////////////////

//

//

//

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <strings.h>

#include <ctype.h>

#include <string.h>

#include <signal.h>

#include <assert.h>

#include <termios.h>

int main(int argc, char **argv) {

        const char      *dev = argv[1];

        const   char    *fname = (argc>=3)?argv[2]:NULL;

        int     ttyfd = -1, dumpfd = -1;

        if (argc < 2) {

                fprintf(stderr, "USAGE: dumpuart /dev/tty... \n");

                exit(EXIT_FAILURE);

        }

        ttyfd = open(dev, O_RDONLY);

        if (ttyfd < 0) {

                fprintf(stderr, "Could not open device, %s\n", dev);

                exit(EXIT_FAILURE);

        }

        if (!isatty(ttyfd)) {

                fprintf(stderr, "Err: %s is not a terminal!\n", dev);

                exit(EXIT_FAILURE);

        }

        if (fname)

                dumpfd = open(fname, O_CREAT|O_TRUNC|O_WRONLY, 0644);

        // Set the baud rate ...

        {

                struct  termios tb;

                tcgetattr(ttyfd, &tb);

                // Set to raw mode

                cfmakeraw(&tb);

                // Non-canonical mode (no line editing ...)

                tb.c_lflag &= (~(ICANON));

                // Set no parity, 8 bit

                tb.c_cflag &= (~(CRTSCTS));

                // One stop bit

                tb.c_cflag &= (~(CSTOPB));

                // 9600 Baud

                cfsetspeed(&tb, B9600);

                // Block until at least one byte is available

                tb.c_cc[VMIN] = 1;

                tb.c_cc[VTIME] = 0;

                // Commit the changes

                tcsetattr(ttyfd, TCSANOW, &tb);

        }

        /*

        if (isatty(STDOUT_FILENO)) {

                struct  termios tb;

                tcgetattr(STDOUT_FILENO, &tb);

        }

        */

        char    buf[64];

        int     nr;

        while((nr=read(ttyfd, buf, sizeof(buf)))>0) {

                if (dumpfd >= 0)

                        write(dumpfd, buf, nr);

                write(STDOUT_FILENO, buf, nr);

        }

        close(ttyfd);

        if (dumpfd >= 0)

                close(dumpfd);

}