AN2120: Connecting an M68HC08 Family Microcontroller to an ...

Application Note
break;
while (FrameSize > 0) {
Option = *ptr;
Size = *(ptr + 1);
FrameSize -= Size;
if (Option == 3) {
ptr += Size;
//Set New Packet size
OutBuffer [7] = InBuffer [7] - Size;
}
else {
while (Size-- ) {
*dest++ = *ptr++;
}
}
}
}
else {
// Acknowledge IP Address //
Move (InBuffer, OutBuffer, InBuffer[7]+6);
OutBuffer [4] = ACK;
ProcPPPSend ((BYTE *)OutBuffer, OutBuffer[7] + 6);
// Now Request IP address to complete 3-way handshake
OutBuffer [4] = REQ; // Request command
OutBuffer [5] = OutBuffer [5] + 1; // Packet ID = ID + 1
OutBuffer [10] = 0; // IP address is set
// to 0 so ISP server
OutBuffer [11] = 0; // can assing us one
OutBuffer [12] = 0;
OutBuffer [13] = 0;
}
ProcPPPSend ((BYTE *)OutBuffer, OutBuffer[7] + 6);
case ACK:
if (InBuffer [8] == 3) { // Reply of the only IPCP
// Request we can send
IPAddress [0] = InBuffer [10]; // ISP assigned IP
IPAddress [1] = InBuffer [11];
IPAddress [2] = InBuffer [12];
IPAddress [3] = InBuffer [13];
break;
}
PORTC = 0xFF;
PPPStatus |= LinkOn; // PPP Link is now up
case NAK:
if ((InBuffer [8] == 0x03) && (InBuffer [7]