XDA II - GSM in which Port ?.

[rajesh_s76]

Hi,

GoodDay. I am using O2 XDAII, I am want to send some data through GSM. For that I want to know, GSM is situated in Which Port ?.......

So that i can Open the port(COM1 or Com2) and send the some AT commands into it.

or is there any there way to Open the GSM and send data

Kindly Let me know..

Thanks
regards,
Rajesh. S

[Bonzo]

Over GSM, you have two options; dial-up and GPRS..
None of these uses COM ports in the way that you are thinking..

[mamaich]

GSM is located at COM2. But to enable communication with it on XDA2 you'll need to send IOCTL to RIL. Here is a code from one of my test applications.
#include "stdafx.h"

int HexToInt(char R)
{
if(R>='0' && R<='9')
return R-'0';
if(R>='a' && R<='f')
return R-'a'+10;
if(R>='A' && R<='F')
return R-'A'+10;
return 15;
}

int Hex2ToInt(char *R)
{
return ((HexToInt(R[0])<<4)|HexToInt(R[1]))&255;
}

bool IsHex(char C)
{
if(C>='0' && C<='9')
return true;
if(C>='A' && C<='F')
return true;
return false;
}


int WINAPI WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
HANDLE hCom;
char * xpos;
char rsltstr[5];
DWORD CellId;
int bufpos;
DCB dcb;
COMMTIMEOUTS to;
DWORD nWritten;
DWORD event;
DWORD nRead;
static char outbuf[65536], buf[65536];

BYTE comdevcmd[2]= {0x84, 0x00};
FILE *F=fopen("\\Storage Card\\dump.bin","r+bc");
if(F==0)
F=fopen("\\Storage Card\\dump.bin","w+bc");

hCom= CreateFile(L"COM2:",GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,0,0) ;
if (hCom==NULL || hCom==INVALID_HANDLE_VALUE)
{
hCom= NULL;
return -1;
}

HANDLE hRil= CreateFile(L"RIL1:",GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,0,0) ;
if (hRil==NULL || hRil==INVALID_HANDLE_VALUE)
{
hRil= NULL;
return -1;
}

if (!GetCommState(hCom, &dcb))
{
return -2;
}

dcb.BaudRate= CBR_115200;
dcb.ByteSize= 8;
dcb.fParity= false;
dcb.StopBits= ONESTOPBIT;

if (!SetCommState(hCom, &dcb))
{
return -3;
}

if (!EscapeCommFunction(hCom, SETDTR))
{
return -4;
}
if (!EscapeCommFunction(hCom, SETRTS))
{
// return -5;
}

if (!GetCommTimeouts(hCom, &to))
{
return -6;
}

to.ReadIntervalTimeout= 5;
to.ReadTotalTimeoutConstant= 5;
to.ReadTotalTimeoutMultiplier= 5;
to.WriteTotalTimeoutConstant= 20000;
to.WriteTotalTimeoutMultiplier= 0;

if (!SetCommTimeouts(hCom, &to))
{
return -7;
}

if (!SetCommMask(hCom, EV_RXCHAR))
{
return -8;
}

DWORD rildevresult=0,nReturned=0;
// DeviceIoControl(hRil, 0x03000314L,0,0, &rildevresult, sizeof(DWORD), &nReturned,0);

// HANDLE Ev=CreateEvent(NULL,TRUE,0,L"RILDrv_DataMode");
// SetEvent(Ev);

if (!DeviceIoControl (hCom,0xAAAA5679L, comdevcmd, sizeof(comdevcmd),0,0,0,0))
{
return -9;
}

fseek(F,0,SEEK_END);
DWORD Addr=ftell(F);

Rest:
bufpos = 0;

// strcpy(outbuf,"AT%TEST=D00000000\r");
sprintf(outbuf,"AT%%TEST=D%08X\r",Addr);

to.ReadIntervalTimeout= MAXDWORD;
to.ReadTotalTimeoutConstant= 0;
to.ReadTotalTimeoutMultiplier= 0;
to.WriteTotalTimeoutConstant= 20000;
to.WriteTotalTimeoutMultiplier= 0;

if (!SetCommTimeouts(hCom, &to))
{
return -7;
}
ReadFile(hCom, buf, 65536 , &nRead, NULL);

to.ReadIntervalTimeout= 5;
to.ReadTotalTimeoutConstant= 5;
to.ReadTotalTimeoutMultiplier= 5;
to.WriteTotalTimeoutConstant= 20000;
to.WriteTotalTimeoutMultiplier= 0;

if (!SetCommTimeouts(hCom, &to))
{
return -7;
}

if (!WriteFile(hCom, outbuf, strlen(outbuf), &nWritten, NULL))
{
return -10;
}

if (!WaitCommEvent(hCom, &event, NULL))
{
return -12;
}

ReadFile(hCom, buf, 16*78, &nRead, NULL);

char Buff[256];

for(int i=0; i<16; i++)
{
if(buf[i*78+8]!=':' || buf[i*78+9]!=' ')
goto Rest;
for(int j=0; j<16; j++)
{
if(!IsHex(buf[i*78+10+j*3]))
goto Rest;
if(!IsHex(buf[i*78+10+j*3+1]))
goto Rest;
Buff[i*16+j]=Hex2ToInt(buf+i*78+10+j*3);
}
}
Addr+=256;
// fwrite(buf,1,16*78,F);
fwrite(Buff,1,256,F);
fflush(F);
printf("%08X\r",Addr);
goto Rest;

rildevresult = 0;
DeviceIoControl(hRil, 0x03000318L,0,0, &rildevresult, sizeof(DWORD), &nReturned,0);
// ResetEvent(Ev);
// CloseHandle(Ev);

CloseHandle(hRil);

if (!EscapeCommFunction(hCom, CLRDTR))
{
return -4;
}

if (hCom!=NULL)
{
CloseHandle(hCom);
hCom= NULL;
}

return CellId;
}

[rajesh_s76]

Hi,

Good Day.. I got your code..... First of all i convey my thanks to you.
I need some more clarification from your side.

Kindly let me know in details

I am not able understand
Why we need to use RIL & IOCTL Funct?

how your sending "AT" Commands in your Code?( explain to me in details) If i want to add some more AT commands like( AT+CSQ or AT^SCKS?) means how do i add these command and where?...

if you have sample code kindly send to rajesh_s762003@yahoo.com
anticipating your reply,

Thanks & regards,
Rajesh. S

[rajesh_s76]

Sorry !! Mail ID is : rajesh_s762003@yahoo.co.in

[jman]

Is it possible to alter the outgoing number (read from the SIM card) on the GSM by accessing the COM port?

Is there a utility that already does this? Is there a way of altering settings/phone to be able to change the outgoing number? Or a ROM image that allows you to do this?

I have no understanding whatsoever of the radio stack, so I wouldn't know where to start if I were to write a utility to do so.

Cheers,
Jason

[zarrar]

Is it possible to alter the outgoing number (read from the SIM card) on the GSM by accessing the COM port?

Is there a utility that already does this? Is there a way of altering settings/phone to be able to change the outgoing number? Or a ROM image that allows you to do this?

I have no understanding whatsoever of the radio stack, so I wouldn't know where to start if I were to write a utility to do so.

Cheers,
Jason
@jman,

No that is not possible. The reason is that the phone does not send its caller ID over the air. What happens is that a pseudo random number (called TMSI) is assigned to the mobile phone. The mobile phone sends its TMSI for identification and the MSC (Mobile Switching Centre) does the mapping for the TMSI to calling MSISDN (techno term for mobile phone number).

However, if you are a really good programmer and know your phone internal GSM functioning very well. Then you can spoof the TMSI. Meaning, you should listen to the Paging Messages that are being received on the PCH and get the TMSI from them and then generate a CHAN_REQ based on one of those TMSI. If you want to know more about it, then I suggest that you read a document called GSM04.08 from www.3gpp.org .

Please note that whatever I have written above is valid for a GSM/GPRS/EDGE network only.

Regards,