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

//

// Filename:    llcomms.cpp

//

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

//

// Purpose:     This defines a C++ interface on the command side that can

//              interact with an FPGA, both sending and receiving characters.

//              Any bus interaction will call routines from this lower level

//              library to accomplish the actual connection to and

//

// 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.

//

// You should have received a copy of the GNU General Public License along

// with this program.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

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

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

//

//

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

//

//

#include <sys/socket.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <termios.h>

#include <netinet/in.h>

#include <netdb.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <arpa/inet.h> 

#include <assert.h> 

#include <strings.h> 

#include <poll.h> 

#include <ctype.h> 

#include "llcomms.h"

LLCOMMSI::LLCOMMSI(void) {

        m_fdw = -1;

        m_fdr = -1;

        m_total_nread = 0l;

        m_total_nwrit = 0l;

}

void    LLCOMMSI::write(char *buf, int len) {

        int     nw;

        nw = ::write(m_fdw, buf, len);

        m_total_nwrit += nw;

        assert(nw == len);

}

int     LLCOMMSI::read(char *buf, int len) {

        int     nr;

        nr = ::read(m_fdr, buf, len);

        m_total_nread += nr;

        return nr;

}

void    LLCOMMSI::close(void) {

        if(m_fdw>=0) ::close(m_fdw);

        if((m_fdr>=0)&&(m_fdr != m_fdw)) ::close(m_fdr);

        m_fdw = m_fdr = -1;

}

bool    LLCOMMSI::poll(unsigned ms) {

        struct  pollfd  fds;

        fds.fd = m_fdr;

        fds.events = POLLIN;

        ::poll(&fds, 1, ms);

        if (fds.revents & POLLIN) {

                return true;

        } else return false;

}

TTYCOMMS::TTYCOMMS(const char *dev) {

        m_fdr = ::open(dev, O_RDWR | O_NONBLOCK);

        if (m_fdr < 0) {

                printf("\n Error : Could not open %s\n", dev);

                perror("O/S Err:");

                exit(-1);

        }

        if (isatty(m_fdr)) {

                struct termios tb;

                tcgetattr(m_fdr, &tb);

                cfmakeraw(&tb);

                // tb.c_iflag &= (~(IXON|IXOFF));

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

                tcsetattr(m_fdr, TCSANOW, &tb);

                tcflow(m_fdr, TCOON);

        }

        m_fdw = m_fdr;

}

NETCOMMS::NETCOMMS(const char *host, const int port) {

        struct sockaddr_in serv_addr;

        struct  hostent *hp;

        if ((m_fdr = socket(AF_INET, SOCK_STREAM, 0)) < 0) {

                printf("\n Error : Could not create socket \n");

                exit(-1);

        }

        memset(&serv_addr, '0', sizeof(serv_addr));

        hp = gethostbyname(host);

        if (hp == NULL) {

                printf("Could not get host entity for %s\n", host);

                perror("O/S Err:");

                exit(-1);

        }

        bcopy(hp->h_addr, &serv_addr.sin_addr.s_addr, hp->h_length);

        serv_addr.sin_family = AF_INET;

        serv_addr.sin_port = htons(port);

        if (connect(m_fdr,(struct sockaddr *)&serv_addr, sizeof(serv_addr))< 0){

                perror("Connect Failed Err");

                exit(-1);

        }

        m_fdw = m_fdr;

}