PPP connection problem

"I am here and I am waiting for reply."

Don't just sit there - get debugging!

Have you run it in the simulator?

"I am here and I am waiting for reply."

Don't just sit there - get debugging!

Have you run it in the simulator?

The MCB2130 supports JTAG debugging:

http://www.keil.com/arm/mcb2130/

http://www.keil.com/support/man/docs/mcb2130/mcb2130_db_ulink.htm

Have you made use of that?

Hello Andy Neil,

Thanks for a piece of good advice.

I have ULINK USB-JTAG Adapter. I use it.
But, there are no source codes of TCP-IP implementation in RL-ARM RealView® Real-Time Library.
I have made small and simple test application.
I have analyzed it under debugger.
Both functions main_TcpNet() and timer_tick () were called periodically.
I have used RTLCD.LIB. I have enabled the debugging on the TCP/IP stack by setting the value DBG_ENABLE to 1. Moreover, I have enabled the full trace mode on PPP by setting DBG_PPP to 2. There were no errors detected in debug mode. However, strange log has been generated by function __debug__. Message which was started from text 'Dialing number' has had strange rubbish in memory. I have passed NULL value as a first argument (digital number) to function ppp_connect.
May be PPP implementation has defect if NULL is passed to function ppp_connect.

I am thankful for your attention.
I'm looking forward to response.

There is a ready example for PPP-server. It demonstrate an usage of TCPnet as a PPP-server. A PC connects to MCB2140 with PPP. When connected, you can browse the board with Internet Explorer. You can take this example as a reference.

For a PPP-client, this is a bit different. You have to:
1. properly configure a dial-in connection on your PC (it is preferred for a direct cable connection)
2. configure TCPnet for PPP-client and connect to PC

Here is an example for PPP-client:

int main() {
  init();
  init_TcpNet();
  ppp_connect(NULL,"Keil","test");
  while (1) {
    timer_poll ();
    main_TcpNet();
  }
}

For a PC direct cable connection you need to add a Null_Modem.c driver to your project. There is a bug in TCPCD.lib library which prints out garbage when a NULL pointer is provided for ppp_connect(). You can avoid this by providing a zero-length string as a dialnum
ppp_conect("",Keil","test");

Hello Franc Urbanc,

Thank you very much for your concern.

Unfortunately, implementation of functions

timer_poll ();

and

init();

are not included to your example.

Fortunately, function with the same names and purposes are included in help system for Keil and example 'HTTP_demo'. So, I have used following source:

#define MCLK 60000000                         /* Master Clock 60 MHz         */
#define TCLK       10                         /* Timer Clock rate 10/s       */
#define TCNT (MCLK/TCLK/4)                    /* Timer Counts                */

/*--------------------------- init ------------------------------------------*/

void init () {
   /* Timer 1 reload to 100ms */
   T1TCR = 1;
   T1MCR = 3;
   T1MR0 = TCNT - 1;                         /* Timer 1 Period               */

   IODIR1  = 0x00FF0000;                     /* P1.16..23 defined as Outputs  */

   /* Enable RxD1 and TxD1 pins. */
   PINSEL0 &= ~0x000F0000;
   PINSEL0 |=  0x00050000;

   U0LCR = 0x83;                             /* 8 bits, no Parity, 1 Stop bit*/
   U0DLL = 97;                            /* 9600 Baud Rate @ 15MHz VPB Clock  */
   U0LCR = 0x03;                             /* DLAB = 0                     */
}


/*--------------------------- sendchar --------------------------------------*/

int sendchar (int ch)  {
   /* Debug output to serial port. */

   if (ch == '\n')  {
      while (!(U0LSR & 0x20));
      U0THR = '\r';                          /* output CR                    */
   }
   while (!(U0LSR & 0x20));
   return (U0THR = ch);
}

static void timer_poll () {

   if (T1IR & 1) {
      T1IR = 1;
      /* Timer tick every 100 ms */
      timer_tick ();
   }
}

int main() {
  init();
  init_TcpNet();
  // ppp_listen ("Keil", "test");
  //ppp_connect("","Keil","test");
  ppp_connect(NULL,"Keil","test");
  while (1) {
    timer_poll ();
    main_TcpNet();
  }
}

Is it correct code?

Moreover, I have initialized COM1 port.

void init_serial (void) {
   /* Initialize the serial interface */
   rbuf.in   = 0;
   rbuf.out  = 0;
   tbuf.in   = 0;
   tbuf.out  = 0;
   tx_active = __FALSE;

   /* Enable RxD1 and TxD1 pins. */
   PINSEL0 &= ~0x000F0000;
   PINSEL0 |=  0x00050000;
   /* 8-bits, no parity, 1 stop bit */
   U1LCR = 0x83;
   U1DLL = 97;                            /* 9600 Baud Rate @ 15MHz VPB Clock  */
   U1LCR = 0x03;

   /* Enable FIFO with 8-byte trigger level. */
   U1FCR = 0x87;
   /* Enable RDA and THRE interrupts. */
   U1IER = 0x03;
   VICDefVectAddr = (U32)def_interrupt;
   /* Enable UART1 interrupts. */
   VICVectAddr14  = (U32)handler_UART1;
   VICVectCntl14  = 0x27;
   VICIntEnable  |= (1 << 7);
}

PPP connection has not been established.

But, PPP connection has been established successfully if ppp_listen is used. So, physically connection is OK.

1. Have you properly configured a dial-in connection on your PC?
(to check connect another PC instead of MCB2130, use null-modem cable)

2. What do the debug messages say? (use ppp_connect("","Keil","temp"))

Hello Franc Urbanc,

I glad to read your replay.

I have checked Incoming connection. Connection from another PC by Null-Modem cable has been established successfully.

Debug messages are:

Initialize PPP interface
Initailize PPP-LCP
Initailize PPP-RAP
Initailize PPP-IPCP
Dialing number:
Username: 'Keil', Password: 'test'

There is no rubbish in memory.
Function '__error__' has not been called.

Is this all what you get from a debug? If you enable debug messages for PPP you should receive more?

Please do not type debug messages, use copy & paste.
There is no PPP-RAP should be PPP-PAP (Pasword Authentication Protocol).

Hello Franc Urbanc,

I have retested it one more time.

Log messages:

Initialize PPP interface
Initailize PPP-LCP
Initailize PPP-PAP
Initailize PPP-IPCP
Dialing number:
Username: 'Keil', Password: 'test'

In file NET_DEBUG.C
#define DBG_PPP 2

When I have been using Hyper Terminal text

RING

was showed.

Thank you in advance for help.

Did you check the HTTP demo Abstract.txt?

NOTE: Serial interface uses only TXD, RXD and GND signals from the
      RS232 line. However in most cases some additional connections
      are required by the PC COM interface. For a 9-PIN standard
      connector you should therefore connect the pin 7 (RTS) to
      pin 8 (CTS) and pin 1 (CD) to pin 4 (DTR) and to pin 6 (DSR).

Thanks for all who tried to help me.

It was Keil's defect in Null-Modem driver.

Keil sent me fixed version of RTL.