void MyWIFI_Ping(void) {
static DWORD Timer;
LONG ret;
char theStr[64];
switch (PingState) {
case SM_HOME:
// Send a ping request out if the global variable is set by MyConsole
if (MyPing_Flag) {
// Don't ping flood: wait at least 1 second between ping requests
if (TickGet() - Timer > 1ul * TICK_SECOND) {
// Obtain ownership of the ICMP module
if (!ICMPBeginUsage())
break;
// Update anti-ping flood timer
Timer = TickGet();
// Send ICMP echo request
#if defined(STACK_USE_DNS)
ICMPSendPingToHostROM((ROM BYTE*) HOST_TO_PING);
#else
ICMPSendPing(AppConfig.MyGateway.Val);
#endif
PingState = SM_GET_ICMP_RESPONSE;
MyPing_Flag = FALSE;
}
}
break;
case SM_GET_ICMP_RESPONSE:
// Get the status of the ICMP module
ret = ICMPGetReply();
if (ret == -2) {
// Do nothing: still waiting for echo
break;
} else if (ret == -1) {
// Request timed out
MyConsole_SendMsg("Ping timed out\n");
PingState = SM_HOME;
} else if (ret == -3) {
// DNS address not resolvable
MyConsole_SendMsg("Can't resolve IP\n");
PingState = SM_HOME;
} else {
// Echo received. Time elapsed is stored in ret (Tick units).
sprintf(theStr, "Reply: %d ms\n", TickConvertToMilliseconds((DWORD) ret));
MyConsole_SendMsg(theStr);
PingState = SM_HOME;
}
// Finished with the ICMP module, release it so other apps can begin using it
ICMPEndUsage();
break;
}
}
/*****************************************************************************
Function:
void PingDemo(void)
Summary:
Demonstrates use of the ICMP (Ping) client.
Description:
This function implements a simple ICMP client. The function is called
periodically by the stack, and it checks if BUTTON0 has been pressed.
If the button is pressed, the function sends an ICMP Echo Request (Ping)
to a Microchip web server. The round trip time is displayed on the UART
when the response is received.
This function can be used as a model for applications requiring Ping
capabilities to check if a host is reachable.
Precondition:
TCP is initialized.
Parameters:
None
Returns:
None
***************************************************************************/
void PingDemo(void)
{
static enum
{
SM_HOME = 0,
SM_GET_ICMP_RESPONSE
} PingState = SM_HOME;
static uint32_t Timer;
int32_t ret;
switch(PingState)
{
case SM_HOME:
// Send a ping request out if the user pushes BUTTON0 (right-most one)
if(BUTTON0_IO == 0u)
{
// Don't ping flood: wait at least 1 second between ping requests
if(TickGet() - Timer > 1ul*TICK_SECOND)
{
// Obtain ownership of the ICMP module
if(!ICMPBeginUsage())
break;
// Update anti-ping flood timer
Timer = TickGet();
// Send ICMP echo request
#if defined(STACK_USE_DNS)
ICMPSendPingToHostROM((ROM uint8_t*)HOST_TO_PING);
#else
ICMPSendPing(AppConfig.MyGateway.Val);
#endif
PingState = SM_GET_ICMP_RESPONSE;
}
}
break;
case SM_GET_ICMP_RESPONSE:
// Get the status of the ICMP module
ret = ICMPGetReply();
if(ret == -2)
{
// Do nothing: still waiting for echo
break;
}
else if(ret == -1)
{
// Request timed out
#if defined(USE_LCD)
memcpypgm2ram((void*)&LCDText[16], (ROM void *)"Ping timed out", 15);
LCDUpdate();
#endif
PingState = SM_HOME;
}
else if(ret == -3)
{
// DNS address not resolvable
#if defined(USE_LCD)
memcpypgm2ram((void*)&LCDText[16], (ROM void *)"Can't resolve IP", 16);
LCDUpdate();
#endif
PingState = SM_HOME;
}
else
{
// Echo received. Time elapsed is stored in ret (Tick units).
#if defined(USE_LCD)
memcpypgm2ram((void*)&LCDText[16], (ROM void *)"Reply: ", 7);
uitoa((uint16_t)TickConvertToMilliseconds((uint32_t)ret), &LCDText[16+7]);
strcatpgm2ram((char*)&LCDText[16+7], "ms");
LCDUpdate();
#endif
PingState = SM_HOME;
}
// Finished with the ICMP module, release it so other apps can begin using it
ICMPEndUsage();
break;
}
}
