Need Help "PPP for 16 bit microcontroller"

[Syed Raza]

Hai All

I am developing PPP for 16 bit micronotroller (EVB3067).Its a very
minimal 
implementation of PPP.

I am trying to establish connection between linux and hitachi evaluation
board. I am 
using 3 SCI port of Hitachi board. 1 for PPP connection 2nd for
downloading the 
code and 3rd is to provide debugging information on hyperterminal(as i
can not use printf() function )

I am having the folowing problems:

- I am not able to convert the ASCI characters into Hexadecimal or
Decimal format which i received in from Client.Is there a problem of
Library,i mean i am using 

newlib-1.8.2 
gcc-2.95.2
binutils-2.9.1
gdb-4.18

I am using Hitachi Deg Interface under NT,for compiling the program i am
using Linux

- I tested my program on Hyperterminal just to cheach if the it works
fine as there is no other  i can cheack it before i started a real
PPP connection.But now i am trying to do the real connection by using the
PPP between linux and my hitachi board.But now the real problem started,
i want to read the PPP frame which is in HDLC format and then reply to
peer after doing the Frame cheack seq ...etc(all what is required by
reall/standard PPP implementation)and cheacking if all the field is
valid.

- But what i am getting is garbage, and what Linux is receiving is also
garbage.Some how data is corrupted.and connection can not establish

- I also notice that some of my function is *NOT working properly (though
there is nothing wrong in the C code it self).My question is is there any
way to provide the more debugging info so that my HDI will read the
program efficently,I tried O,O1,....no success



/******************************************************************************
First state machine for receiving the frame from PPP_BEGIN_FLAG to
PPP_END_FLAG
*******************************************************************************/

void handle_char (unsigned char r){
unsigned char tmp[100];
unsigned char tmp1[100];
switch (state){ 
  case not_reading:
      if(r ==
PPP_BEGIN_FLAG)         
         putstring"PPP
BEGIN FLAG
received....\n");        

      state =
reading;         
     
break;          
      case reading: 
 switch(r){        
 case
PPP_END_FLAG:           

 printf(" PPP END FLAG is received\n
");           

 frame_check();           

 if (cheack_fcs() !=
0)           

{            

putstring("not the correct
packet\n\r");               

break;           

}            

buff[0] =
PPP_BEGIN_FLAG;            

buff[1] =
0xff;            

buff[2] =
0x3;            

*(unsigned short *) &(buff[3]) =
0xc021;            

buff[4] =
0x2;             
 buff[41] = PPP_END_FLAG
for(num_char_transmit
= 0;num_char_transmit <
41;num_char_transmit++)            
transmit(buff[num_char_transmit]);            

memcpy(tmp,&buff[4],1);            

sprintf(tmp1,"%u",tmp);             

putstring("this is decimal field
\n\r");             

putstring(tmp1);                        

putstring("received PPP FRAME:
\n");                         

putstring(buff);              

num_char_read =
0;                      

state =
not_reading;                      

break;           

default:          

if (num_char_read ==
BUFSIZE)           

{              

putstring("buffer is  FULL..\n\r"
);                          

break;           

}else{               

 buff[num_char_read++] =
r;                 

break;                          

     
}                

    }      
  }   
} 
====================================================== 

Any of the Help,idea or trick will be wellcome, as this is my thesis of
BEng and i need to soon please reply

Best regards

Syed
-------------VTT - Technical Research Centre of
Finland-----------
Syed
Raza                                
 
VTT-Electronics
                      
           
P.O.Box
1100                               
                
FIN-90571 Oulu,
Finland                           


Email: Syed.Raza@vtt.fi    
URL:
www.ele.vtt.fi
Tel: (Res)+358 8 880 4183
Tel: (off)  +358 8  551 2439.
Fax: (off) +358 8 551 2320.
---------------------------------------------------------------------------------



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