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

*/
#include "IP.h"
#include "ICMP.h"
/***********************************************************************
Function : ICMPPing
Parameters : IP Address to ping
Date : September 2000
Desc : Sends a ICMP ECHO message to a remote host
***********************************************************************/
void IcmpPing (BYTE Ip[]) {
WORD Value;
static BYTE Seq = 0xAB;
}
AN2120
Application Note
Code Implementation
ip_out->SourceAddress [0] = IPAddress [0];// Ping will have our source address
ip_out->SourceAddress [1] = IPAddress [1];
ip_out->SourceAddress [2] = IPAddress [2];
ip_out->SourceAddress [3] = IPAddress [3];
ip_out->DestAddress [0] = Ip[0]; // Set destination IP address
ip_out->DestAddress [1] = Ip[1];
ip_out->DestAddress [2] = Ip[2];
ip_out->DestAddress [3] = Ip[3];
ip_out->Payload [0] = ECHO; // ICMP message type set to ECHO
ip_out->Payload [1] = 0; // ICMP code must by set to zero
ip_out->Payload [2] = 0; // reset checksum
ip_out->Payload [3] = 0;
ip_out->Payload [4] = 1; // set ID of ICMP message
ip_out->Payload [5] = 0;
Seq++;
ip_out->Payload [6] = (Seq >> 8) & 0xFF; // set sequence number of ICMP Msg
ip_out->Payload [7] = Seq & 0xFF;
ip_out->Protocol = ICMP; // IP datagram will carry ICMP data
ip_out->Length = 28; // ECHO message doesn't include data
Value = IPCheckSum ((BYTE *)&ip_out->Payload[0], (ip_out->Length - 20) >> 1);
ip_out->Payload [2] = (Value >> 8); // obtain ICMP checksum
ip_out->Payload [3] = (Value & 0xFF);
IPNetSend (ip_out); // Net send to IP layer
MOTOROLA 85