自学教程：C++ uip_periodic函数代码示例

/** Manages the currently open network connections, including TCP and (if enabled) UDP. */static void uIPManagement_ManageConnections(void){	/* Poll TCP connections for more data to send back to the host */	for (uint8_t i = 0; i < UIP_CONNS; i++)	{		uip_poll_conn(&uip_conns[i]);		/* If a response was generated, send it */		if (uip_len > 0)		{			/* Add destination MAC to outgoing packet */			uip_arp_out();			/* Split and send the outgoing packet */			uip_split_output();		}	}	/* Manage open connections for timeouts */	if (timer_expired(&ConnectionTimer))	{		timer_reset(&ConnectionTimer);		LEDs_SetAllLEDs(LEDMASK_USB_BUSY);		for (uint8_t i = 0; i < UIP_CONNS; i++)		{			/* Run periodic connection management for each TCP connection */			uip_periodic(i);			/* If a response was generated, send it */			if (uip_len > 0)			{				/* Add destination MAC to outgoing packet */				uip_arp_out();				/* Split and send the outgoing packet */				uip_split_output();			}		}		#if defined(ENABLE_DHCP_CLIENT)		for (uint8_t i = 0; i < UIP_UDP_CONNS; i++)		{			/* Run periodic connection management for each UDP connection */			uip_udp_periodic(i);			/* If a response was generated, send it */			if (uip_len > 0)			{				/* Add destination MAC to outgoing packet */				uip_arp_out();				/* Split and send the outgoing packet */				uip_split_output();			}		}		#endif		LEDs_SetAllLEDs(LEDMASK_USB_READY);	}	/* Manage ARP cache refreshing */	if (timer_expired(&ARPTimer))	{		timer_reset(&ARPTimer);		uip_arp_timer();	}}

void vuIP_Task( void *pvParameters ){portBASE_TYPE i;unsigned long ulNewEvent = 0UL;unsigned long ulUIP_Events = 0UL;	( void ) pvParameters;		/* Initialise the uIP stack. */	prvInitialise_uIP();	/* Initialise the MAC. */	vInitEmac();	while( lEMACWaitForLink() != pdPASS )    {        vTaskDelay( uipINIT_WAIT );    }	for( ;; )	{		if( ( ulUIP_Events & uipETHERNET_RX_EVENT ) != 0UL )		{					/* Is there received data ready to be processed? */			uip_len = ( unsigned short ) ulEMACRead();						if( ( uip_len > 0 ) && ( uip_buf != NULL ) )			{				/* Standard uIP loop taken from the uIP manual. */				if( xHeader->type == htons( UIP_ETHTYPE_IP ) )				{					uip_arp_ipin();					uip_input();					/* If the above function invocation resulted in data that					should be sent out on the network, the global variable					uip_len is set to a value > 0. */					if( uip_len > 0 )					{						uip_arp_out();						vEMACWrite();					}				}				else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )				{					uip_arp_arpin();					/* If the above function invocation resulted in data that					should be sent out on the network, the global variable					uip_len is set to a value > 0. */					if( uip_len > 0 )					{						vEMACWrite();					}				}			}			else			{				ulUIP_Events &= ~uipETHERNET_RX_EVENT;			}		}				if( ( ulUIP_Events & uipPERIODIC_TIMER_EVENT ) != 0UL )		{			ulUIP_Events &= ~uipPERIODIC_TIMER_EVENT;								for( i = 0; i < UIP_CONNS; i++ )			{				uip_periodic( i );				/* If the above function invocation resulted in data that				should be sent out on the network, the global variable				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					uip_arp_out();					vEMACWrite();				}			}		}				/* Call the ARP timer function every 10 seconds. */		if( ( ulUIP_Events & uipARP_TIMER_EVENT ) != 0 )		{			ulUIP_Events &= ~uipARP_TIMER_EVENT;			uip_arp_timer();		}					if( ulUIP_Events == pdFALSE )		{			xQueueReceive( xEMACEventQueue, &ulNewEvent, portMAX_DELAY );			ulUIP_Events |= ulNewEvent;		}	}}

void vuIP_Task( void *pvParameters ){long i;unsigned long ulNewEvent = 0UL, ulUIP_Events = 0UL;unsigned short usPacketLength;	/* Just to prevent compiler warnings about the unused parameter. */	( void ) pvParameters;	/* Initialise the uIP stack, configuring for web server usage. */	prvInitialise_uIP();	/* Initialise the MAC and PHY. */	vEMACInit();	for( ;; )	{		/* Is there received data ready to be processed? */		usPacketLength = usEMACRead();		/* Statements to be executed if data has been received on the Ethernet. */		if( ( usPacketLength > 0U ) && ( uip_buf != NULL ) )		{			uip_len = usPacketLength;						if( xHeader->type == htons( UIP_ETHTYPE_IP ) )			{				uip_arp_ipin();				uip_input();				/* If the above function invocation resulted in data that				should be sent out on the network, the global variable				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					uip_arp_out();					vEMACWrite();				}			}			else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )			{				uip_arp_arpin();				/* If the above function invocation resulted in data that				should be sent out on the network, the global variable				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					vEMACWrite();				}			}		}		else		{			/* Clear the RX event latched in ulUIP_Events - if one was latched. */			ulUIP_Events &= ~uipETHERNET_RX_EVENT;		}		/* Statements to be executed if the TCP/IP period timer has expired. */		if( ( ulUIP_Events & uipPERIODIC_TIMER_EVENT ) != 0UL )		{			ulUIP_Events &= ~uipPERIODIC_TIMER_EVENT;			if( uip_buf != NULL )			{				for( i = 0; i < UIP_CONNS; i++ )				{					uip_periodic( i );						/* If the above function invocation resulted in data that					should be sent out on the network, the global variable					uip_len is set to a value > 0. */					if( uip_len > 0 )					{						uip_arp_out();						vEMACWrite();					}				}			}		}		/* Statements to be executed if the ARP timer has expired. */		if( ( ulUIP_Events & uipARP_TIMER_EVENT ) != 0 )		{			ulUIP_Events &= ~uipARP_TIMER_EVENT;			uip_arp_timer();		}		/* If all latched events have been cleared - block until another event		occurs. */		if( ulUIP_Events == pdFALSE )		{			xQueueReceive( xEMACEventQueue, &ulNewEvent, portMAX_DELAY );			ulUIP_Events |= ulNewEvent;		}	}}

void vuIP_Task( void *pvParameters ){portBASE_TYPE i;uip_ipaddr_t xIPAddr;struct timer periodic_timer, arp_timer;extern void ( vEMAC_ISR_Wrapper )( void );	/* Create the semaphore used by the ISR to wake this task. */	vSemaphoreCreateBinary( xEMACSemaphore );		/* Initialise the uIP stack. */	timer_set( &periodic_timer, configTICK_RATE_HZ / 2 );	timer_set( &arp_timer, configTICK_RATE_HZ * 10 );	uip_init();	uip_ipaddr( xIPAddr, uipIP_ADDR0, uipIP_ADDR1, uipIP_ADDR2, uipIP_ADDR3 );	uip_sethostaddr( xIPAddr );	httpd_init();	/* Initialise the MAC. */	while( Init_EMAC() != pdPASS )    {        vTaskDelay( uipINIT_WAIT );    }	portENTER_CRITICAL();	{		MAC_INTENABLE = INT_RX_DONE;        VICIntEnable |= 0x00200000;        VICVectAddr21 = ( portLONG ) vEMAC_ISR_Wrapper;		prvSetMACAddress();	}	portEXIT_CRITICAL();		for( ;; )	{		/* Is there received data ready to be processed? */		uip_len = uiGetEMACRxData( uip_buf );				if( uip_len > 0 )		{			/* Standard uIP loop taken from the uIP manual. */			if( xHeader->type == htons( UIP_ETHTYPE_IP ) )			{				uip_arp_ipin();				uip_input();				/* If the above function invocation resulted in data that 				should be sent out on the network, the global variable 				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					uip_arp_out();					prvENET_Send();				}			}			else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )			{				uip_arp_arpin();				/* If the above function invocation resulted in data that 				should be sent out on the network, the global variable 				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					prvENET_Send();				}			}		}		else		{			if( timer_expired( &periodic_timer ) )			{				timer_reset( &periodic_timer );				for( i = 0; i < UIP_CONNS; i++ )				{					uip_periodic( i );						/* If the above function invocation resulted in data that 					should be sent out on the network, the global variable 					uip_len is set to a value > 0. */					if( uip_len > 0 )					{						uip_arp_out();						prvENET_Send();					}				}						/* Call the ARP timer function every 10 seconds. */				if( timer_expired( &arp_timer ) )				{					timer_reset( &arp_timer );					uip_arp_timer();				}			}			else			{							/* We did not receive a packet, and there was no periodic				processing to perform.  Block for a fixed period.  If a packet				is received during this period we will be woken by the ISR//.........这里部分代码省略.........

void vuIP_Task( void *pvParameters ){portBASE_TYPE i;uip_ipaddr_t xIPAddr;struct timer periodic_timer, arp_timer;	/* Create the semaphore used by the ISR to wake this task. */	vSemaphoreCreateBinary( xSemaphore );		/* Initialise the uIP stack. */	timer_set( &periodic_timer, configTICK_RATE_HZ / 2 );	timer_set( &arp_timer, configTICK_RATE_HZ * 10 );	uip_init();	uip_ipaddr( xIPAddr, uipIP_ADDR0, uipIP_ADDR1, uipIP_ADDR2, uipIP_ADDR3 );	uip_sethostaddr( xIPAddr );	uip_ipaddr( xIPAddr, uipNET_MASK0, uipNET_MASK1, uipNET_MASK2, uipNET_MASK3 );	uip_setnetmask( xIPAddr );	uip_ipaddr( xIPAddr, uipGATEWAY_ADDR0, uipGATEWAY_ADDR1, uipGATEWAY_ADDR2, uipGATEWAY_ADDR3 );	uip_setdraddr( xIPAddr );		httpd_init();	/* Initialise the MAC. */	ENET_InitClocksGPIO();	ENET_Init();	portENTER_CRITICAL();	{		ENET_Start();		prvSetMACAddress();		VIC_Config( ENET_ITLine, VIC_IRQ, 1 );		VIC_ITCmd( ENET_ITLine, ENABLE );			ENET_DMA->ISR = uipDMI_RX_CURRENT_DONE; 		ENET_DMA->IER = uipDMI_RX_CURRENT_DONE;	}	portEXIT_CRITICAL();		while(1)	{		/* Is there received data ready to be processed? */		uip_len = ENET_HandleRxPkt( uip_buf );				if( uip_len > 0 )		{			/* Standard uIP loop taken from the uIP manual. */			if( xHeader->type == htons( UIP_ETHTYPE_IP ) )			{				uip_arp_ipin();				uip_input();				/* If the above function invocation resulted in data that				should be sent out on the network, the global variable				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					uip_arp_out();					prvENET_Send();				}			}			else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )			{				uip_arp_arpin();				/* If the above function invocation resulted in data that				should be sent out on the network, the global variable				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					prvENET_Send();				}			}		}		else		{			if( timer_expired( &periodic_timer ) )			{				timer_reset( &periodic_timer );				for( i = 0; i < UIP_CONNS; i++ )				{					uip_periodic( i );						/* If the above function invocation resulted in data that					should be sent out on the network, the global variable					uip_len is set to a value > 0. */					if( uip_len > 0 )					{						uip_arp_out();						prvENET_Send();					}				}						/* Call the ARP timer function every 10 seconds. */				if( timer_expired( &arp_timer ) )				{					timer_reset( &arp_timer );					uip_arp_timer();				}			}			else			{							/* We did not receive a packet, and there was no periodic//.........这里部分代码省略.........

/***************************************************************************** 函 数 名  : uip_main 功能描述  : uip main looplock function 输入参数  : void   输出参数  : 无 返 回 值  :  调用函数  :  被调函数  :   修改历史      :  1.日    期   : 2017年4月17日    作    者   : QSWWD    修改内容   : 新生成函数*****************************************************************************/void uip_main(void){  int i;  uip_ipaddr_t ipaddr;  struct timer periodic_timer, arp_timer;  timer_set(&periodic_timer, CLOCK_SECOND / 2);  timer_set(&arp_timer, CLOCK_SECOND * 10);    uip_init();  uip_ipaddr(ipaddr, 192,168,1,6);  uip_sethostaddr(ipaddr);  uip_ipaddr(ipaddr, 192,168,1,1);  uip_setdraddr(ipaddr);  uip_ipaddr(ipaddr, 255,255,255,0);  uip_setnetmask(ipaddr);  /*MAC*/  memcpy(&uip_ethaddr,eth_mac_addr(),6);  /*app initialize*/  uip_app_init();  //main loop  while(1) {    	uip_len = tapdev_read(uip_buf);    if(uip_len > 0) 	{		      if(BUF->type == htons(UIP_ETHTYPE_IP)) 	  {		uip_arp_ipin();		uip_input();		/* If the above function invocation resulted in data that	   	should be sent out on the network, the global variable	   	uip_len is set to a value > 0. */		if(uip_len > 0) {	  		uip_arp_out();	  		tapdev_send(uip_buf,uip_len);		}      } 	  else if(BUF->type == htons(UIP_ETHTYPE_ARP)) 	  {			uip_arp_arpin();		/* If the above function invocation resulted in data that		   should be sent out on the network, the global variable		   uip_len is set to a value > 0. */		if(uip_len > 0) {		  tapdev_send(uip_buf,uip_len);		}      }    } 	else if(timer_expired(&periodic_timer)) 	{     	timer_reset(&periodic_timer);      	for(i = 0; i < UIP_CONNS; i++) 		{			uip_periodic(i);			/* If the above function invocation resulted in data that	   		should be sent out on the network, the global variable	   		uip_len is set to a value > 0. */			if(uip_len > 0) 			{	  			uip_arp_out();	  			tapdev_send(uip_buf,uip_len);			}      	}#if UIP_UDP      for(i = 0; i < UIP_UDP_CONNS; i++) 	  {		uip_udp_periodic(i);		/* If the above function invocation resulted in data that	   		should be sent out on the network, the global variable	   		uip_len is set to a value > 0.	   	*/		if(uip_len > 0) 		{		  uip_arp_out();		  tapdev_send(uip_buf,uip_len);		}      }#endif /* UIP_UDP */            /* Call the ARP timer function every 10 seconds. */     if(timer_expired(&arp_timer)) //.........这里部分代码省略.........

void vuIP_Task( void *pvParameters ){portBASE_TYPE i;uip_ipaddr_t xIPAddr;struct timer periodic_timer, arp_timer;	/* Initialise the uIP stack. */	timer_set( &periodic_timer, configTICK_RATE_HZ / 2 );	timer_set( &arp_timer, configTICK_RATE_HZ * 10 );	uip_init();	uip_ipaddr( xIPAddr, uipIP_ADDR0, uipIP_ADDR1, uipIP_ADDR2, uipIP_ADDR3 );	uip_sethostaddr( xIPAddr );	httpd_init();	/* Initialise the MAC. */	do    {		vTaskDelay( uipINIT_WAIT );		xEMACSemaphore = xEMACInit();            } while( xEMACSemaphore == NULL );	for( ;; )	{		/* Is there received data ready to be processed? */		uip_len = ulEMACPoll();				if( uip_len > 0 )		{			/* Standard uIP loop taken from the uIP manual. */			if( xHeader->type == htons( UIP_ETHTYPE_IP ) )			{				uip_arp_ipin();				uip_input();				/* If the above function invocation resulted in data that 				should be sent out on the network, the global variable 				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					uip_arp_out();					lEMACSend();				}			}			else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )			{				uip_arp_arpin();				/* If the above function invocation resulted in data that 				should be sent out on the network, the global variable 				uip_len is set to a value > 0. */				if( uip_len > 0 )				{					lEMACSend();				}			}		}		else		{			if( timer_expired( &periodic_timer ) )			{				timer_reset( &periodic_timer );				for( i = 0; i < UIP_CONNS; i++ )				{					uip_periodic( i );						/* If the above function invocation resulted in data that 					should be sent out on the network, the global variable 					uip_len is set to a value > 0. */					if( uip_len > 0 )					{						uip_arp_out();						lEMACSend();					}				}						/* Call the ARP timer function every 10 seconds. */				if( timer_expired( &arp_timer ) )				{					timer_reset( &arp_timer );					uip_arp_timer();				}			}			else			{							/* We did not receive a packet, and there was no periodic				processing to perform.  Block for a fixed period.  If a packet				is received during this period we will be woken by the ISR				giving us the Semaphore. */				xSemaphoreTake( xEMACSemaphore, configTICK_RATE_HZ / 2 );						}		}	}}

// This gets called on both Ethernet RX interrupts and timer requests,// but it's called only from the Ethernet interrupt handlervoid elua_uip_mainloop(){  u32 temp, packet_len;  // Increment uIP timers  temp = platform_eth_get_elapsed_time();  periodic_timer += temp;  arp_timer += temp;    // Check for an RX packet and read it  if( ( packet_len = platform_eth_get_packet_nb( uip_buf, sizeof( uip_buf ) ) ) > 0 )  {    // Set uip_len for uIP stack usage.    uip_len = ( unsigned short )packet_len;    // Process incoming IP packets here.    if( BUF->type == htons( UIP_ETHTYPE_IP ) )    {      uip_arp_ipin();      uip_input();      // If the above function invocation resulted in data that      // should be sent out on the network, the global variable      // uip_len is set to a value > 0.      if( uip_len > 0 )      {        uip_arp_out();        device_driver_send();      }    }    // Process incoming ARP packets here.    else if( BUF->type == htons( UIP_ETHTYPE_ARP ) )    {      uip_arp_arpin();      // If the above function invocation resulted in data that      // should be sent out on the network, the global variable      // uip_len is set to a value > 0.      if( uip_len > 0 )        device_driver_send();    }  }    // Process TCP/IP Periodic Timer here.  // Also process the "force interrupt" events (platform_eth_force_interrupt)  if( periodic_timer >= UIP_PERIODIC_TIMER_MS )  {    periodic_timer = 0;    uip_set_forced_poll( 0 );  }  else    uip_set_forced_poll( 1 );  for( temp = 0; temp < UIP_CONNS; temp ++ )  {    uip_periodic( temp );    // If the above function invocation resulted in data that    // should be sent out on the network, the global variable    // uip_len is set to a value > 0.    if( uip_len > 0 )    {      uip_arp_out();      device_driver_send();    }  }#if UIP_UDP    for( temp = 0; temp < UIP_UDP_CONNS; temp ++ )    {      uip_udp_periodic( temp );      // If the above function invocation resulted in data that      // should be sent out on the network, the global variable      // uip_len is set to a value > 0.      if( uip_len > 0 )      {        uip_arp_out();        device_driver_send();      }    }#endif // UIP_UDP    // Process ARP Timer here.  if( arp_timer >= UIP_ARP_TIMER_MS )  {    arp_timer = 0;    uip_arp_timer();  }  }

/*---------------------------------------------------------------------------*/intmain(void){  int i;  uip_ipaddr_t ipaddr;  struct uip_timer periodic_timer, arp_timer;    timer_set(&periodic_timer, CLOCK_SECOND / 2);  timer_set(&arp_timer, CLOCK_SECOND * 10);    network_device_init();  uip_init();  uip_ipaddr(ipaddr, 192,168,0,2);  uip_sethostaddr(ipaddr);  httpd_init();    while(1) {    uip_len = network_device_read();    if(uip_len > 0) {      if(BUF->type == htons(UIP_ETHTYPE_IP)) {	uip_arp_ipin();	uip_input();	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  uip_arp_out();	  network_device_send();	}      } else if(BUF->type == htons(UIP_ETHTYPE_ARP)) {	uip_arp_arpin();	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  network_device_send();	}      }    } else if(timer_expired(&periodic_timer)) {      timer_reset(&periodic_timer);      for(i = 0; i < UIP_CONNS; i++) {	uip_periodic(i);	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  uip_arp_out();	  network_device_send();	}      }#if UIP_UDP      for(i = 0; i < UIP_UDP_CONNS; i++) {	uip_udp_periodic(i);	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  uip_arp_out();	  network_device_send();	}      }#endif /* UIP_UDP */            /* Call the ARP timer function every 10 seconds. */      if(timer_expired(&arp_timer)) {	timer_reset(&arp_timer);	uip_arp_timer();      }    }  }  return 0;}

/*---------------------------------------------------------------------------*/intmain(void){  EEPROM_main();  int i;  uip_ipaddr_t ipaddr;  struct timer periodic_timer, arp_timer;  memcpy (&uip_ethaddr.addr[0], &eeprom.MAC[0], 6);  AVR_init();  egpio_init();  clock_init();  mbuf_init();  adlc_init();  GICR = (1 << INT0);  timer_set(&periodic_timer, CLOCK_SECOND / 2);  timer_set(&arp_timer, CLOCK_SECOND * 10);  nic_init();  uip_ipaddr(ipaddr, eeprom.IPAddr[0],eeprom.IPAddr[1],eeprom.IPAddr[2],eeprom.IPAddr[3]);  uip_sethostaddr(ipaddr);  uip_ipaddr(ipaddr, eeprom.Gateway[0],eeprom.Gateway[1],eeprom.Gateway[2],eeprom.Gateway[3]);  uip_setdraddr(ipaddr);  uip_ipaddr(ipaddr, eeprom.Subnet[0],eeprom.Subnet[1],eeprom.Subnet[2],eeprom.Subnet[3]);  uip_setnetmask(ipaddr);  telnetd_init();  aun_init();  internet_init();  egpio_write (EGPIO_STATUS_GREEN);  while(1) {// check the econet for complete packets    adlc_poller();    aun_poller ();    uip_len = nic_poll();    if(uip_len > 0) {      if(BUF->type == htons(UIP_ETHTYPE_IP)) {	uip_arp_ipin();	uip_input();	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	maybe_send();      } else if(BUF->type == htons(UIP_ETHTYPE_ARP)) {	uip_arp_arpin();	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  nic_send(NULL);	}      }    } else if(timer_expired(&periodic_timer)) {      timer_reset(&periodic_timer);      for(i = 0; i < UIP_CONNS; i++) {	uip_periodic(i);	maybe_send();      }#if UIP_UDP      for(i = 0; i < UIP_UDP_CONNS; i++) {	uip_udp_periodic(i);	maybe_send();      }#endif /* UIP_UDP */      /* Call the ARP timer function every 10 seconds. */      if(timer_expired(&arp_timer)) {	timer_reset(&arp_timer);	uip_arp_timer();      }    }  }}

/*-----------------------------------------------------------------------------------*/intmain(void){	idata u8_t i, arptimer;	idata u16_t j;//	idata int i;	InitGraphic();//putchar(0,62,0);	//while(1)	for(i=0;i<100;i++)	{		putstring(6,0, "Welcome to http://shop34480016.taobao.com  www.dianshijin.cn");	}	init_uart();	printu("starting....../r/n");	/* Initialize the device driver. */ 	//  rtl8019as_init();	dev_init();	uip_arp_init();	/* Initialize the uIP TCP/IP stack. */	uip_init();	printu("11111111111111111111111/r/n");	/* Initialize the HTTP server. *///	httpd_init();	tcp_server_init();		arptimer = 0;	printu("222222222222222222222222222/r/n");  while(1) {    /* Let the tapdev network device driver read an entire IP packet       into the uip_buf. If it must wait for more than 0.5 seconds, it       will return with the return value 0. If so, we know that it is       time to call upon the uip_periodic(). Otherwise, the tapdev has       received an IP packet that is to be processed by uIP. */    uip_len = dev_poll();	for(j=0;j<500;j++);/*	if(uip_len > 0)	{		printuf("--------------- uip_len = 0x%x", uip_len);		printuf("%x ----------/r/n", uip_len);		for(i=0;i<uip_len;i++)		{			printuf("%x ", uip_buf[i]);			if((i+1)%16==0) printu("/r/n");					}		printu("/r/n");				}*/    if(uip_len == 0) {      for(i = 0; i < UIP_CONNS; i++) {	uip_periodic(i);	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  uip_arp_out();	  dev_send();	}      }#if UIP_UDP      for(i = 0; i < UIP_UDP_CONNS; i++) {	uip_udp_periodic(i);	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  uip_arp_out();	  dev_send();	}      }#endif /* UIP_UDP */            /* Call the ARP timer function every 10 seconds. */      if(++arptimer == 20) {		uip_arp_timer();	arptimer = 0;      }          } else {      if(BUF->type == htons(UIP_ETHTYPE_IP)) {	uip_arp_ipin();	uip_input();	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */	if(uip_len > 0) {	  uip_arp_out();	  dev_send();	}      } else if(BUF->type == htons(UIP_ETHTYPE_ARP)) {	uip_arp_arpin();	/* If the above function invocation resulted in data that	   should be sent out on the network, the global variable	   uip_len is set to a value > 0. */		if(uip_len > 0) {		  dev_send();	}//.........这里部分代码省略.........

/******************************************************************************  Main Control Loop**  *****************************************************************************/int main(void){ 	//led PB4	// Pins als Ausg
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