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problem is sending sms with 8051 by siemens C55

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cllunlu

Tue Apr 22 2008, 08:10PM

Registered Member #7394

Joined: Tue Apr 22 2008, 07:29PM

Posts: 29
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hi friends.
I am trying to send sms with 8051(89c51rc2)and siemens C55.But I failed.I dont know why.When I try to send sms,cellphone turns off.
My schematic and C code here.where is my mistake.I dont know.
Also I can send sms by hyperterminal with data cable.And I simulated it by proteus succesfully.And it is project to pass the class.Plz help me firends.

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

that is C code:

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

CODE:

#include <t89c51Rx2.h> //

unsigned char rcvd[2];

unsigned char j;

unsigned char k;

bit ok=0;

bit ok1=0;

void init() /// u put int() here 

{

TMOD=0x20;

TH1=0xFD;

SCON=0x50;

TR1=1;

}

void sendString(unsigned char *a)

{

while(*a!='\0')

{

SBUF=*a;

while(TI==0);

TI=0;

a++;

}

}

void sendChar(unsigned char b)

{

SBUF=b;

while(TI==0);

TI=0;

}

unsigned char rcv()

{

while(RI==0);

RI=0;

return SBUF;

}

void checkOK()

{

for(j=0;j<2;j++)

rcvd[j]=rcv();

if(rcvd[0]=='o'&&rcvd[1]=='k')

ok=1;

else

ok=0;

}

void checkOKe()

{

k=rcv();

if(k=='>')

ok1=1;

else

ok1=0;

}

void main()

{

P2_0=0;

P2_1=0;

while(1)

{

if(P1_0==0)

{

init();

sendString("AT");

sendChar(0x0D);

checkOK();

if(ok==1)

{

P2_0=1;

sendString("AT+CMGS=19");

sendChar(0x0D);

checkOKe();

if(ok1==1)

{

P2_1=1;

sendString("079109459208003311000C910945664173350000AA05E8329BFD06");

//sms center no:+905429800033, destination number:+905466143753, message:"HELLO" 

sendChar(0x1A);

}

else P2_1=0;

}

else

P2_0=0;

}

}

}

enson.rar

[ Edited Wed Apr 23 2008, 01:48AM ]

celalunlu

shyam

Tue Apr 22 2008, 08:25PM

Registered Member #2984

Joined: Mon Aug 06 2007, 11:33AM

Posts: 710
Thanked 104 times in 100 posts

sendString("079109459208003311000C910945664173350000AA05E8329BFD06");
//sms center no:+905429800033, destination number:+905466143753, message:"HELLO"

what is this??
PDU??

doesnot the modem support text mesaging???

lProgress is not made by early risers or hard workers, but by LAZY people, trying to find easier ways to do the same........

cllunlu

Tue Apr 22 2008, 09:10PM

Registered Member #7394

Joined: Tue Apr 22 2008, 07:29PM

Posts: 29
Thanked 0 times in 0 posts

yes it is pdu mode.Because my cellphone is siemens C55 and it supports only pdu mode.
I can send sms by hyperterminal with pdu mode.And I simulated it by proteus.Serial communication looks success.But it doesnt work when I do that schematic.Cellphone close itself.I dont know why?

celalunlu

Ajay

Wed Apr 23 2008, 01:53AM

Rickey's World Admin

Registered Member #1

Joined: Fri Feb 24 2006, 04:56AM

Posts: 3533
Thanked 646 times in 610 posts

problem seems here..

CODE:

void checkOK()

{

for(j=0;j<2;j++)

rcvd[j]=rcv();

if(rcvd[0]=='o'&&rcvd[1]=='k')

ok=1;

else

ok=0;

}

you are checking for small 'o' and small 'k' whereas phone sends capital 'O' and capital 'K'. so you variable ok is never 1. I hope you got my point.

So make the change in program as..

CODE: