loopback problem using serial manager

[sunita rawat]

Hi All,

I am using serial manager but i am facing a problem regarding loopback. I 
want to run a small program in emulator. But i am getting nothing on the 
receiving side.
Can anyone help me?

After going through forums and knowledge base, i understood that usinf 
serial manager and ir we can send data without using any cable or 
intermediate device. Am i correct? If so, please tell me how to go about it.

For this i am using following functions -
OpenSerial()      // to open a serial connection. here i specify for 
loopback in SrmControl
WriteSerial()      // to write to the port
ReadSerial()      // to receive the data

static Err OpenSerial()
{
Err error;
UInt32 value;
UInt32 flags =0;
UInt16 flagsSize = sizeof(flags);

error = FtrGet(sysFileCSerialMgr,sysFtrNewSerialPresent,&value);

if(value == 0)
  FrmCustomAlert(DummyAlert,"new serial manager","","");
else
{
  error = SrmControl(gPortID,srmCtlStartLocalLoopback,NULL,0); // for 
loopback
  error = SrmOpen('ircm' ,9600,&gPortID);
  ErrNonFatalDisplayIf(error == serErrBadPort,"serErrBadport");

  switch(error)
  {
   case errNone:
      break;
   case serErrAlreadyOpen:
      SrmClose(gPortID);
      FrmCustomAlert(DummyAlert,"serial manager busy","","");
      return error;
      break;
   default:
      FrmCustomAlert(DummyAlert,"serial manager open","","");
      return error;
      break;
  }
  g_connected = true;

  SrmReceiveFlush(gPortID,100);
  return error;
}
return error;
}


static void WriteSerial()
{
Err error;
Char *text;
UInt16 s1;

Char linefeed = chrLineFeed;

if(g_connected == false) return;

text = MemPtrNew(30);
StrCopy(text,"12345678");
s1 = SrmSend(gPortID,text,StrLen(text),&error);
SrmControl(gPortID, srmCtlStartLocalLoopback, NULL, 0);
SrmControl(gPortID, srmCtlRxEnable,   0, 0 );

if(error)
  FrmCustomAlert(DummyAlert,"error in sending data","","");

SrmSend(gPortID,&linefeed,1,&error);

if(error)
  FrmCustomAlert(DummyAlert,"error in sending data","","");
}


static void ReadSerial()
{
static Char buffer[50];
static UInt16 index =0;
Err error;
UInt32 bytes=0;
Char *msg;

if(g_connected == false)
  return;

SrmControl(gPortID, srmCtlRxEnable, NULL, 0);
SrmControl(gPortID,srmCtlStartLocalLoopback, NULL, 0);
error =SrmReceiveCheck(gPortID,&bytes);

if(error)
{
  FrmCustomAlert(DummyAlert,"error in receiving","","");
  return;
}

MemSet(buffer,50,0);
if(bytes + index > sizeof(buffer))
  bytes = sizeof(buffer) - index - sizeOf7BitChar('\0');

while(bytes)
{
  SrmReceive(gPortID,&buffer[index],1,0,&error);

  if(error)
  {
   SrmReceiveFlush(gPortID,1);
   index =0;
   return;
  }
  switch(buffer[index])
  {
   case chrCarriageReturn:
     buffer[index] = chrLineFeed;
   case chrLineFeed:
     buffer[index+1] = chrNull;
     FrmCustomAlert(DummyAlert,buffer,"","");
     index =0;
     break;
   default:
    index++;
     break;
  }
  bytes--;
}
}

_________________________________________________________________
Send and receive Hotmail on your mobile device: http://mobile.msn.com


-- 
For information on using the Palm Developer Forums, or to unsubscribe, please see 
http://www.palmos.com/dev/support/forums/