Help with UDP send - Electronic Circuits Projects Diagrams Free

MrNobody · 28th May 2008, 01:48 AM

Hi,
Below is a function in C18 to send data using UDP. It is able to send "BYE" successfully.

Code:

void UDP_Send()
{
   #define LPORT_SEND 8001    //Local port to send from
   #define RPORT_SEND 8002    //Remote port to send to
   static ROM BYTE *StringData = "BYE"; 
   UDP_SOCKET    SocketTransmit;
   NODE_INFO    Remote;
   BYTE        *A;
   
   Remote.IPAddr.v[0]=192;
   Remote.IPAddr.v[1]=168;
   Remote.IPAddr.v[2]=2;
   Remote.IPAddr.v[3]=2;
   
   if(!MACIsLinked())
       return;
       
   SocketTransmit = UDPOpen(LPORT_SEND, &Remote, RPORT_SEND);
   
   if(SocketTransmit == INVALID_UDP_SOCKET)
       return;
       
   if(!UDPIsPutReady(SocketTransmit))
   {
       UDPClose(SocketTransmit);
       return;
   }
   
   AAA = UDPPutROMString(StringData);    // Send string

   UDPFlush();
   UDPClose(SocketTransmit);
}

How can i convert the code into a function which is able to receive variable passed to it, forexample UDP_Send("Hello") will send "Hello" instead of sending "BYE".
I tried to convert the code into:

Code:

 void UDP_Send(ROM BYTE *StringData)
 {
     #define LPORT_SEND 8001    //Local port to send from
     #define RPORT_SEND 8002    //Remote port to send to
     UDP_SOCKET    SocketTransmit;
     NODE_INFO    Remote;
     BYTE        *A;
     
     Remote.IPAddr.v[0]=192;
     Remote.IPAddr.v[1]=168;
     Remote.IPAddr.v[2]=2;
     Remote.IPAddr.v[3]=2;
     
     if(!MACIsLinked())
         return;
         
     SocketTransmit = UDPOpen(LPORT_SEND, &Remote, RPORT_SEND);
     
     if(SocketTransmit == INVALID_UDP_SOCKET)
         return;
         
     if(!UDPIsPutReady(SocketTransmit))
     {
         UDPClose(SocketTransmit);
         return;
     }
     
     AAA = UDPPutROMString(StringData);    // Send string
 
     UDPFlush();
     UDPClose(SocketTransmit);
 }

and call it using UDP_Send("Hello"); but it doesn't seem to work..

Please advice.

Pommie · 28th May 2008, 05:19 AM

Have you tried UDP_Send((rom char*)"Hello");

I assume there is also a function UDPPutRAMString which could send actual variable strings. You would of course have to copy your ROM strings to RAM.

Mike.

MrNobody · 28th May 2008, 07:07 AM

Hi Mike,
Tried UDP_Send((rom char*)"Hello"); but in wireshark, it shows
"10 420.030195 192.168.2.4 192.168.2.2 UDP Source port: vcom-tunnel Destination port: teradataordbms[Malformed Packet]"

Yes, it does have function UDPPutRAMString.. Umm, how would I copy the ROM strings to RAM.

Is it UDP_Send((ram char*)"Hello");..?

Pommie · 28th May 2008, 07:28 AM

I just do,

Code:

void CopyString(ram char* RamString,rom char * RomString){
    do{
        *RamString++=*RomString;
    }while(*RomString++!=0);
}
// and then do,
    CopyString(RamStringVar,(rom char*) "Hello World");

It is rather confusing having different pointer types that are not interchangeable.

Mike.

MrNobody · 28th May 2008, 03:40 PM

Thanks alot..

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28th May 2008, 05:19 AM	(permalink)
Pommie	Have you tried UDP_Send((rom char*)"Hello"); I assume there is also a function UDPPutRAMString which could send actual variable strings. You would of course have to copy your ROM strings to RAM. Mike.

28th May 2008, 07:07 AM	(permalink)
MrNobody	Hi Mike, Tried UDP_Send((rom char)"Hello"); but in wireshark, it shows "10 420.030195 192.168.2.4 192.168.2.2 UDP Source port: vcom-tunnel Destination port: teradataordbms[Malformed Packet]" Yes, it does have function UDPPutRAMString.. Umm, how would I copy the ROM strings to RAM. Is it UDP_Send((ram char)"Hello");..?

28th May 2008, 07:28 AM	(permalink)
Pommie	I just do, Code: void CopyString(ram char* RamString,rom char * RomString){ do{ RamString++=RomString; }while(RomString++!=0); } // and then do, CopyString(RamStringVar,(rom char) "Hello World"); It is rather confusing having different pointer types that are not interchangeable. Mike.