chat.c File Reference

UDP chat program. More...

#include <BoardSupport/inc/stdtypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <inttypes.h>
#include <time.h>
#include <string.h>
#include <Libs/NETlib/net.h>
#include <BoardSupport/inc/BoardSpecific.h>
#include <Common/Common.h>
#include <Common/uartio.h>
#include <Common/timer.h>
#include <Common/CPrintf.h>
#include <BoardSupport/config/netconfig.c>

Functions
int	main (void)

Variables
char *	program_name = "chat"
char *	udp_data
SOCKET *	udp_tx
SOCKET *	udp_rx

Detailed Description

                          _         _             _
                       __| |    ___(_) ____ _ __ | |_
                      / _` |   / __| |/ _` | '_ \| __|
                     | (_| | _ \__ \ | (_| | | | | |_
                      \__,_|(_) ___/_|\__, |_| |_|\__|
                     Signalprocessing |___/ Technology

Author

D.SignT GmbH & Co. KG, Claus Hermbusche

Date

2019-06-03

Function Documentation

int main

(

void

)

{
    /***************************************************************************
     locals
    ***************************************************************************/
    int main_loop = 1;                /* main loop switch, set to 0 to exit   */
    timeval stamp1, stamp2, delta;    /* used to determine startup time       */
    int32_t  len;                     /* received data length                 */

    /***************************************************************************
      initialize application (e.g. timer clocks, PLL settings, EMIF etc.)
       (ref. \Common\Common.c)
    ***************************************************************************/
    AppInit (GET_CLOCK);

    /***************************************************************************
      select output device for CPrintf  (ref. \Common\cprintf.c)
      possible settings:
        CPRINTF_UART_OUTPUT                       -> output to UART
        CPRINTF_CCS_OUTPUT                        -> output to CCS
        CPRINTF_UART_OUTPUT | CPRINTF_CCS_OUTPUT  -> output to UART and CCS
    ***************************************************************************/
    CPrintf_select_output (CPRINTF_DEFAULT_OUTPUT);  /* default outputs       */

    /***************************************************************************
     print a start up message
    ***************************************************************************/
    START_UP_MESSAGE (BLANK_REV NETLIB_REV);

    /**************************************************************************/
    // CPrintfProgress (" Heap check ");
    // at least 0x2000 bytes required for this app
    /**************************************************************************/
    ASSERT_HEAP (initial_heap_size, 0x2000);
    // CPrintfProgressSuccess();

    /***************************************************************************
     malloc space for data
    ***************************************************************************/
    CPrintfProgress (" Try to allocate data buffer ");
    udp_data = (char *) malloc (UDP_MAX_PACKET_SIZE * sizeof(char));
    if ( udp_data == NULL )
    {
        prg_exit ("out of memory error");
    }
    CPrintfProgressSuccess();

    /**************************************************************************/
     CPrintfProgress (" Setup system time ");
     // 1 milli seconds resolution
    /**************************************************************************/
    SetupSystemTime ( SYSTEM_TIMER_INT, SYSTEM_TIMER, RES_MSECONDS);
    CPrintfProgressSuccess();
    CPrintf ("   *** timer %d mapped to CPU int %d ***\r\n",
             SystemTimerDev, SYSTEM_TIMER_INT);

    /**************************************************************************/
     CPrintfProgress (" Enable interrupts ");
    /**************************************************************************/
    BoardEnableInterrupts();
    CPrintfProgressSuccess();

    /**************************************************************************/
     CPrintfProgress (" Start system timer ");
    /**************************************************************************/
    StartSystemTimer ();
    CPrintfProgressSuccess();
    CPrintf ("   *** timer %d running at %"PRId32" Hz ***\r\n", SystemTimerDev, RES_SECONDS/GetSystemTimerRes());

    /***************************************************************************
      measure network initialization time
    ***************************************************************************/
    stamp1 = GetTimeStamp();

    /**************************************************************************/
     CPrintfProgress (" Initialize network ");
    /**************************************************************************/
    InitializeNetwork ( 64); // 64 bytes for ping

    /**************************************************************************
     open sockets:
    **************************************************************************/
    udp_tx = socket_open (ANY_ADDRESS,
                          5061,
                          5031,
                          DATATYPE_CHAR,
                          UDP_INIT_FUNC);
    if ( udp_tx == INVALID_SOCKET )
    {
        prg_exit ("socket_open() error");      /* possibly insufficient heap */
    } // if

    udp_rx = socket_open (ANY_ADDRESS,
                          5062,
                          5032,
                          DATATYPE_CHAR,
                          UDP_INIT_FUNC);
    if ( udp_rx == INVALID_SOCKET )
    {
        prg_exit ("socket_open() error");      /* possibly insufficient heap */
    } // if

    /***************************************************************************
     set receive buffer
    ***************************************************************************/
    set_recv_buffer (udp_rx, udp_data, UDP_MAX_PACKET_SIZE);
    CPrintfProgressSuccess();

    stamp2 = GetTimeStamp();

    tv_interval (&delta, &stamp1, &stamp2);
    CPuts (" network startup time [sec]: ");
    CPrintf (VT100_RED
             "%"PRId32".%03"PRId32"\r\n"
             VT100_DEFAULT,
              delta.tv_sec,
              delta.tv_usec/1000);


    /***************************************************************************
      main program loop: set main_loop to 0 to exit loop
    ***************************************************************************/
    CPuts ("\r\n Entering main loop ...");
    while ( main_loop )
    {
        /***********************************************************************
         process net_isq()
        ***********************************************************************/
        net_isq ();

        /***********************************************************************
         monitor link status
        ***********************************************************************/
        monitor_link_status (CPrintf);

        /***********************************************************************
         try to detect IP assignment
          if DHCP is used, the assigned IP address may change
        ***********************************************************************/
        monitor_ip_address (CPrintf);

        if ( net_recv (udp_rx, udp_data, UDP_MAX_PACKET_SIZE) )
        {
            // len = net_recv_event_handler (udp_rx, CPrintf); /* with messages  */
            len = net_recv_event_handler (udp_rx, NULL);  /* without messages */
            if (len)
            {
                /***************************************************************
                 udp_tx is configured for "ANY_ADDRESS", that means, the
                 destination address is unknown. If you want to send the
                 received message on udp_rx back to sender, you have to
                 copy the destination address information from udp_rx to udp_tx:
                ***************************************************************/
                udp_tx-> dest_addr = udp_rx-> dest_addr;

                /***************************************************************
                 send message back to sender
                ***************************************************************/
                net_send_safe (udp_tx, udp_data, len, 0);
            }
        }

        /***********************************************************************
         show that the program is running, perform symbol animation
        ***********************************************************************/
        CPrintAnimatedSymbol ( sym_animate, 200000, ANIMATE_SYMBOLS_COUNT);
    }

    /***************************************************************************
      exit program, shut down peripherals
    ***************************************************************************/
    return (0);
}

Variable Documentation

char* program_name = "chat"

char* udp_data

Examples:

Chat.c, Multicast.c, and Send.c.

SOCKET* udp_tx

Examples:

Chat.c.

SOCKET* udp_rx

Examples:

Chat.c.