Part II : Need Help "PPP for 16 bit microcontroller"

[Syed Raza <Syed dot Raza at vtt dot fi>]

Hai 

Thank you very much for reply, below u will find my receiving() &
transmiting() function which may the reason of not getting the whole PPP
packet correctely.

====================================================================
Does this mean that you have two ports connected to the NT-machine and
one to
the Linux-machine (the PPP-link) ?

- yes i am using 3rd SCI channel for debuging and to transmitting the
contents of my buffer, I configure it using a small external RS232/TTL
converter circuit 




Where is your write() outputting now? Why not just change the
default
newlib one:

- my write and read functions(transmit() , receive() respectively) are as
under, i didnt use my receive( ) function as an interrupt 

====
SCI 1 AND 2 INITILIZATION
====
void initio (void)
{ 
SCI_SMR1 = 0x00; 
SCI_BRR1 = 0x0e; 
SCI_SCR1 = 0x30; 
SCI_SSR1 &= 0x84; 
SCI_SMR2 = 0x00; 
SCI_BRR2 = 0x0e; Baud rate 38400 bit/sec
SCI_SCR2 = 0x30; 
SCI_SSR2 &= 0x84; 
}

==================================
Function for receiving the date
===================================
unsigned char receive (void)

{ 
unsigned char c; 
while ((SCI_SSR1 & 0x040) != 0x40) 
{ 
if ((SCI_SSR1 & 0x38) != 0x00) 
{ 
SCI_SSR1 &= 0xC7; 
} 
} 
c = SCI_RDR1; 
SCI_SSR1 &= 0xBF; 
return(c);
} 

void transmit (unsigned char t) 
{ 
while ((SCI_SSR1 & 0x80) != 0x80); 
SCI_TDR1 = t; 
SCI_SSR1 &= 0x7F;
}
===================================================
Function for printing the debuggin info to Hyperterminal
====================================================

void printf(unsigned char *str) 
{ 
while (*str != '\0') 
transmitSCI2(*str++);
}

void transmitSCI2(unsigned char t)
{ 
while ((SCI_SSR2 & 0x80) != 0x80); 
SCI_TDR2 = t; 
SCI_SSR2 &= 0x7F;
}


-- my hitachi board and linux box is using the same baud rate which is
38400 bit/sec 


???????????????????????????????

---------------------- clip
------------------------------------------
int _write(file, ptr, len)
int file;
char *ptr;
int len;
{
int todo;

for (todo = 0; todo < len; todo++) 
{
asm("mov.b #0,r1l\n mov.b %0l,r2l\njsr @@0xc4" : :
"r" (*ptr++) : "r1", "r2");
}
return len;
}
---------------------- clip
------------------------------------------

The problem could not be because of folow control,as i was receiving the
and transmiting the the ASCII characters by using the windows to
Hitachi

looking forward your help 

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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