/* Define FreeRTOS_gethostbyname() as a normal blocking call. */
uint32_t FreeRTOS_gethostbyname( const char *pcHostName )
{
return FreeRTOS_gethostbyname_a( pcHostName, ( FOnDNSEvent ) NULL, ( void* )NULL, 0 );
}
static void prvNTPTask( void *pvParameters )
{
BaseType_t xServerIndex = 3;
struct freertos_sockaddr xAddress;
#if( ipconfigUSE_CALLBACKS != 0 )
F_TCP_UDP_Handler_t xHandler;
#endif /* ipconfigUSE_CALLBACKS != 0 */
xStatus = EStatusLookup;
#if( ipconfigSOCKET_HAS_USER_SEMAPHORE != 0 ) || ( ipconfigUSE_CALLBACKS != 0 )
{
xNTPWakeupSem = xSemaphoreCreateBinary();
}
#endif
#if( ipconfigUSE_CALLBACKS != 0 )
{
memset( &xHandler, '\0', sizeof ( xHandler ) );
xHandler.pOnUdpReceive = xOnUdpReceive;
FreeRTOS_setsockopt( xUDPSocket, 0, FREERTOS_SO_UDP_RECV_HANDLER, ( void * ) &xHandler, sizeof( xHandler ) );
}
#endif
#if( ipconfigSOCKET_HAS_USER_SEMAPHORE != 0 )
{
FreeRTOS_setsockopt( xUDPSocket, 0, FREERTOS_SO_SET_SEMAPHORE, ( void * ) &xNTPWakeupSem, sizeof( xNTPWakeupSem ) );
}
#endif
for( ; ; )
{
switch( xStatus )
{
case EStatusLookup:
if( ( ulIPAddressFound == 0ul ) || ( ulIPAddressFound == ~0ul ) )
{
if( ++xServerIndex == sizeof pcTimeServers / sizeof pcTimeServers[ 0 ] )
{
xServerIndex = 0;
}
FreeRTOS_printf( ( "Looking up server '%s'\n", pcTimeServers[ xServerIndex ] ) );
FreeRTOS_gethostbyname_a( pcTimeServers[ xServerIndex ], vDNS_callback, (void *)NULL, 1200 );
}
else
{
xStatus = EStatusAsking;
}
break;
case EStatusAsking:
{
char pcBuf[16];
prvNTPPacketInit( );
xAddress.sin_addr = ulIPAddressFound;
xAddress.sin_port = FreeRTOS_htons( NTP_PORT );
FreeRTOS_inet_ntoa( xAddress.sin_addr, pcBuf );
FreeRTOS_printf( ( "Sending UDP message to %s:%u\n",
pcBuf,
FreeRTOS_ntohs( xAddress.sin_port ) ) );
uxSendTime = xTaskGetTickCount( );
FreeRTOS_sendto( xUDPSocket, ( void * )&xNTPPacket, sizeof( xNTPPacket ), 0, &xAddress, sizeof( xAddress ) );
}
break;
case EStatusPause:
break;
case EStatusFailed:
break;
}
#if( ipconfigUSE_CALLBACKS != 0 )
{
xSemaphoreTake( xNTPWakeupSem, 5000 );
}
#else
{
uint32_t xAddressSize;
BaseType_t xReturned;
xAddressSize = sizeof( xAddress );
xReturned = FreeRTOS_recvfrom( xUDPSocket, ( void * ) cRecvBuffer, sizeof( cRecvBuffer ), 0, &xAddress, &xAddressSize );
switch( xReturned )
{
case 0:
case -pdFREERTOS_ERRNO_EAGAIN:
case -pdFREERTOS_ERRNO_EINTR:
break;
default:
if( xReturned < sizeof( xNTPPacket ) )
{
FreeRTOS_printf( ( "FreeRTOS_recvfrom: returns %ld\n", xReturned ) );
}
else
{
prvReadTime( ( struct SNtpPacket *)cRecvBuffer );
if( xStatus != EStatusPause )
{
xStatus = EStatusPause;
}
}
break;
}
}
#endif
}
}
