main.#3

用c8051f340基于51单片机上网

      {
         event_word &= (~EVENT_ARP_RETRANSMIT);
         EA = 1;
         arp_retransmit();
		}

     else if (event_word_copy & EVENT_AGE_ARP_CACHE)
      {
         event_word &= (~EVENT_AGE_ARP_CACHE);
			EA = 1;
         age_arp_cache();
		}

		else if (event_word_copy & EVENT_READ_ANALOG)	//读AD输入的时间
      {
         event_word &= (~EVENT_READ_ANALOG);
         EA = 1;
		
		///	read_analog_inputs();
      }

	
		else if (event_word_copy & EVENT_RS232_ARRIVED)
      {
         event_word &= (~EVENT_RS232_ARRIVED);
         EA = 1;
      }
//////////copy web340      
      //-----------------------------
      // End Main Application Loop
      //----------------------------- 
      }          

   

   // Main do-while initialization loop -- code execution will now restart 
   } while(1);
}

//-----------------------------------------------------------------------------
// Ethernet_ISR
//-----------------------------------------------------------------------------
//
// This Interrupt Service Routine checks the number of packets in the receive
// buffer after each packet is received. If the buffer has 7 or more packets,
// then packet reception is disabled. Packet reception is re-enabled in the 
// CP220x_Receive() routine after all packets have been unloaded.
//
// Allowed Latency: This interrupt service routine should be serviced within
//                  51.2 us of the interrupt flag. This is the amount of time
//                  it takes to receive a minimum-sized 64-byte packet. To 
//                  allow for greater latency (51.2us/packet), the maximum 
//                  number of packets allowed in the receive buffer can be 
//                  decreased.
//-----------------------------------------------------------------------------
void Ethernet_ISR(void)
{
   unsigned char interrupt_read;
   unsigned char valid_bits;
   unsigned char num_packets;

   // Clear interrupt flags.
   interrupt_read = INT1;
   interrupt_read = INT0;
   
   // Check for packet received interrupt
   if( interrupt_read & RXINT)
   {   
      // Count the number of packets in the receive buffer         
      // This is equal to the number of bits set to 1 in TLBVALID
      valid_bits = TLBVALID;     
                           
      // Loop accumulates the number of bits set in Valid_Bits and 
      // stores this value in i. Uses the Brian Kernighan method 
      // for counting bits
      for(num_packets = 0; valid_bits; num_packets++)      
      {                                 
         valid_bits &= valid_bits - 1; 
      }
   
      // If the receive buffer has 7 packets, then disable reception.
      if( num_packets >= 7) 
      {
         RXCN = RXINH;           // Inhibit New Packet Reception
      }
   } 
   
   // Check for the FIFO Full Interrupt
   else if (interrupt_read & RXFINT)
   {
      // This interrupt could mean a few large packets were received,
      // or a large number of small packets were received.      
   } 
   
}


/**************************************************************************/
// 以太网帧接收函数
/**************************************************************************/
void eth_rcve(UCHAR xdata * inbuf)
{
   ETH_HEADER xdata * eth;
   eth = (ETH_HEADER xdata *)inbuf;
   if (eth->frame_type < 1520)	   // 帧长度不能超过IEEE 802标准归定
      {
	    return;      
      }
     
   switch (eth->frame_type)	      //根据接收到的数据包类型,选择不同的处理方式
      {
	   case ARP_PACKET:
	        arp_rcve(inbuf);
	        break;
		      
	   case IP_PACKET:
	        ip_rcve(inbuf);
            break;
	   default:break;
      }
}

//-----------------------------------------------------------------------------
// CP220x_Send
//-----------------------------------------------------------------------------
// 
// Return Value : None
// Parameters   : 
//   1)  MACADDRESS* pDestAddr - destination MAC address. 
//   2)  unsigned char* buffer - address of payload. 
//   3)  unsigned int buffer_length - length of payload. 
//   4)  unsigned int packet_type - contents of Ethertype field.
//
// This function sends an IEEE 802.3 Ethernet packet using the CP220x.
// Upon entry, there should be valid data in array <buffer>.
//
//        (8 bytes)  48-bit  48-bit    16-bit   0-1500 bytes   
//  ----------------------------------------------------------------------
// | Preamble| SFD | Dest |Source| Type/Length |Data Field | Pad |  FCS  |
// |         |     | Addr | Addr |    Field    |           |     | (CRC) |
//  ----------------------------------------------------------------------
//    supplied by  |         supplied by the MCU                 | supplied
//      CP220x     |          (minimum 64 bytes)                 | by CP220x  
//
//
//-----------------------------------------------------------------------------
void CP220x_Send( MACADDRESS* pDestAddr, unsigned char* buffer, 
                  unsigned int buffer_length, unsigned int packet_type)
{

   int i; 
   unsigned int ramaddr;

   // Define Macro to increment the RAM address Pointer
   #define INC_RAMADDR  ramaddr++; \
                        RAMADDRH = (ramaddr >> 8);\
                        RAMADDRL = (ramaddr & 0x00FF);


   // Step 1: Poll TXBUSY until it becomes 0x00
   while(TXBUSY);

   // Step 2: Set the TXSTARTH:TXSTARTL address to 0x0000
   TXSTARTH = 0x00;
   TXSTARTL = 0x00;


   // Step 3: Load data into transmit buffer
   // When the random access method is used, we do not need to check for
   // aborted packets. This method will be slightly slower than the Autowrite
   // method, however, it reduces code space requirements.
  
      // Setup RAM Address Pointer To 0x0000	
      RAMADDRH = 0x00;
      RAMADDRL = 0x00;
      ramaddr = 0x0000;

      // Step 3a: Load the destination address
      for(i = 0; i < 6; i++){
         
         RAMTXDATA = pDestAddr->Char[i];
         INC_RAMADDR

      }

      // Step 3b: Load the source address
      for(i = 0; i < 6; i++){
         RAMTXDATA = MYMAC.Char[i];
         INC_RAMADDR
      }
      
      // Step 3c: Load the Type/Length Field
      RAMTXDATA = (packet_type >> 8);
      INC_RAMADDR

      RAMTXDATA = (packet_type & 0xFF);
      INC_RAMADDR


      // Step 3d: Load the packet payload
      for(i = 0; i < buffer_length; i++){
         RAMTXDATA = buffer[i];
         INC_RAMADDR
      }
      
      // Step 3e: Pad short packets  //将不足64字节长度的数据填充到64字节
      while(ramaddr < 64){
         RAMTXDATA = 0;
         INC_RAMADDR
      }
      
      // Set the TXENDH:TXENDL address to <ramaddr - 1>
      ramaddr--;
      TXENDH = (ramaddr >> 8);
      TXENDL = (ramaddr & 0x00FF);


   // Step 4: Set the TXSTARTH:TXSTARTL address back to 0x0000
   TXSTARTH = 0x00;
   TXSTARTL = 0x00;
   
   // Step 5: Write '1' to TXGO to begin transmission
   TXCN = 0x01;
 
}


//-----------------------------------------------------------------------------
// CP220x_Receive
//-----------------------------------------------------------------------------
// 
// This function reads the current packet from the CP220x receive buffer and 
// copies it to the passed buffer. The data copied to the buffer includes the
// 14-byte Ethernet Header and the Data Field. 
//
// Returns the number of bytes added to the buffer.
//
//        (8 bytes)  48-bit  48-bit    16-bit       0-1500 bytes   
//  --------------------------------------------------------------------------
// | Preamble | SFD | Dest | Source | Type/Length |  Data Field | Pad |  FCS  |
// |          |     | Addr |  Addr  |    Field    |             |     | (CRC) |
//  --------------------------------------------------------------------------
//     supplied by  |           supplied by the MCU             | supplied by 
//       CP220x     |                                           |    CP220x  
//-----------------------------------------------------------------------------
unsigned int CP220x_Receive(unsigned char* buffer, unsigned int buffer_length)
{
   bit rx_ok;
   bit skip = 0;
   UINT_struct cplen;   
   unsigned int i;

   // Step 1: Check the RXOK bit to see if packet was received correctly
   rx_ok = (CPINFOL & RXOK) && (CPINFOH & RXVALID);
   
   // Step 2: If packet received correctly, read the length, otherwise, skip packet.
   if(rx_ok){
   
      // Read the packet length
      cplen.Char[0] = CPLENH;
      cplen.Char[1] = CPLENL;
        
   } else {
     
      // Set packet length to zero
      cplen.Int = 0;
      
      // Skip packet
      skip = 1;      
   }   

   // Step 3: Read the entire packet from the buffer 
   
   // If packet will fit in the buffer
   if(buffer_length >= cplen.Int){
      
      // Copy entire packet
      for(i = 0; i < cplen.Int; i++){
         *buffer++ = RXAUTORD;
      }

   } else {

      // Set packet length to zero
      cplen.Int = 0;
      
      // Skip packet
      skip = 1; 
   }
      
   // Step 4: Skip the packet, or clear the valid bit if the entire packet
   // has been unloaded from the buffer.
   
   if(skip)
   {
      RXCN |= 0x02;                    // Skip the packet
   } 

   else 
   {
      RXCN |= 0x04;                    // Clear the valid bit only
   }

   // If there are no more packets in the receive buffer, enable reception
   if(TLBVALID == 0x00)
   {
      RXCN = 0x00;   
   }
   
   // Return the number of bytes added to the buffer
   return cplen.Int;
}

/********************************************************************/
//上位机与下位进行交互程序
/********************************************************************/
void LightONOFF(bit b)
{
	if (b)
	{
		led=1;
	}
	else
	{
		led=0;
	}
	

}
//-----------------------------------------------------------------------------
// End Of File
//-----------------------------------------------------------------------------