sistem link Opzioni

[lupo]

scusate, e possibile giocare con il visula boy advance,in sistem link,inserendo l'ip del computer di un amico?l'opzione c'e' mi da una porta 55555 qualcuno sa dirmi gli eventuali parametri?grazie

[Lino]

Ma, veramente quando si possa usare non saprei, ma quello che posso dire che non riesco a capire come funzioni, ho questo esempio, scaricato da gbadev, e dopo alcune ore non capisco come funzioni il gba link, ti riporto il codice

void ExchangePackets(u16 outPacket) {

u16 myPlayerNumber = EWRAM[0xc5];
if (myPlayerNumber == 0) {       // IF WE'RE THE MASTER
  while(SIOCNT & SIO_ACTIVE) { }     // wait until the bus is not active
  SIODATA = outPacket;       // post our data
  SIOCNT = SIO_MP115200 | SIO_ACTIVE | SIO_IRQ; // initiate the transfer

} else {           // IF NOT THE MASTER
  SIODATA = outPacket;       // just post our data
  while(!(SIOCNT & SIO_ACTIVE)) { }    // then wait until the bus becomes active
}
while(SIOCNT & SIO_ACTIVE) { }      // wait until it's done
SIODATA = outPacket;        // repost our packet, in case of timing problems
}


void ExchangeStructs(int totalPlayers) {

u16 sender,receiver,totalResponses,totalPackets,inPacketNumber,currentPacketNumber,i
nPacket;
u8* targetStruct;
u8 inData;
u16 outPacket = 0xFFFF; // 0xFFFF is the "null" code for the IO Bus
u16 myPlayerNumber = EWRAM[0xc5];

// loop through all the players so they can update everyone's copy of their mpData Struct
for (sender=0; sender<totalPlayers; sender++ ) {

  // figure out which mpData struct we're targeting and get its size
  if (sender==0) {
   totalPackets = sizeof(mpData0);
   targetStruct = (u8*)&mpData0;
  } else if (sender==1) {
   totalPackets = sizeof(mpData1);
   targetStruct = (u8*)&mpData1;
  } else if (sender==2) {
   totalPackets = sizeof(mpData2);
   targetStruct = (u8*)&mpData2;
  } else {
   totalPackets = sizeof(mpData3);
   targetStruct = (u8*)&mpData3;
  }

  // get ready to send or receive
  currentPacketNumber = 0;
 

  if (myPlayerNumber == sender) { // if we are the sender


   while (currentPacketNumber < totalPackets) { // iterate across our mpData and send it a byte at a time

    // encode the packet: the 1st 8 bits contain the packetNumber, and 9-16 contain the data
    outPacket = (currentPacketNumber<<8) + *(targetStruct+currentPacketNumber);

   
    totalResponses = 0;  // wait for everyone to say they are ready by posting the packet back to you
    while (totalResponses < totalPlayers) {
    
     totalResponses = 0;
     ExchangePackets(outPacket);

     for (receiver=0; receiver<totalPlayers; receiver++ ) {
     
      inPacket = SIOMPRECV[receiver];
      if (inPacket == outPacket) {
       totalResponses++;
      }
     }
    }
   
    // move on to the next packet
    currentPacketNumber++;
   }

  } else { // we are a receiver


   while (currentPacketNumber < totalPackets) {

    ExchangePackets(outPacket);
    inPacket = SIOMPRECV[sender];
    inPacketNumber = (inPacket >> 8);
    inData = (u8)inPacket;

    // if it's the next packet we need, then grab it
    if (inPacketNumber == currentPacketNumber) {

     // grab our data
     *(targetStruct+inPacketNumber) = inData;
    
     // then let the sender know that we got it
     outPacket = inPacket;   
    
     currentPacketNumber++;
   
    }
  
   }
   // send our packets out one last time to make sure the
   // master got our final confirmation
   ExchangePackets(outPacket);
  }
}
}

Sinceramente non capisco quando il master dopo aver trasmesso si ritrovi sul suo buffer (SIOMPRECV) lo stesso valore trasmesso e dopo ritrasmettendo si trovi il valore dell'altro gba. Quando e' che l'altro gba puo' trasmettere?


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