udp.h

ATmega103、ATmega128做的开发板web server源码

/******************************************************************
* udp.h:
* 
* Copyright (c) 2001 Atmel Corporation.
* All Rights Reserved.
*
* You are autorized to use, copy and distribute this software only at 
* a single site (the term "site" meaning a single company location). 
* This copyright notice must be included in any copy, modification 
* or portion of this software merged into another program.
* 
* This software is licenced solely for use with Atmel AVR micro 
* controller family. The software may not be modified to execute on 
* any other microcontroller architectures
*
* This software is provided "as is"; Without warranties either express
* or implied, including any warranty regarding merchantability, 
* fitness for a particular purpose or noninfringement. 
*
* In no event shall Atmel or its suppliers be liable for any special, 
* indirect,incidential or concequential damages resulting from the 
* use or inability to use this software.
*
* Revision history:
*
* January 17, 2001:   Version 1.0   Created by JB
* July 13, 2001		  Version 1.2     JB
* 					- Changed to IAR compiler V2.25
*					- Renamed flash file functions to avoid conflict with 
*					  standard file I/O names	
*					- Bug fixes in HTTP
*					- Speed optimization in TCP 
*
*
*******************************************************************/

//frame offset
#define UDP_SENDER_PORT           0
#define UDP_TARGET_PORT           1
#define UDP_LENGTH                2
#define UDP_CHECKSUM              3
#define UDP_DATA                  4
#define UDP_HEADER_LENGTH         8
                                                                                                      
#define UDP_HEADER_START          17             //start index of udp-header in frame
#define UDP_PSEUDO_HEADER_LENGTH  12             //pseudo header length
#define UDP_MAX_DATA_LENGTH       1400           //max UDP data size on ethernet is 1472 bytes
#define UDP_NUM_BUF               1              //number of udp-buffers

/* udp-buffer structure */
typedef struct{
  unsigned int dataLength;                       //length of data
  unsigned int hisIP0;                           //destination ip
  unsigned int hisIP1;                           //destination ip
  unsigned int hisPort;                          //destination port
  unsigned int myPort;                           //source port
  unsigned char data[UDP_MAX_DATA_LENGTH];       //data
}UDPB;

/*
  UDP-User interface.
*/

/*If data is availible, it is copied to appBuffer and 1 is returned, zero is returned otherwise*/
unsigned char readUDP(unsigned int port,UDPB * appBuffer);
/*returns number of bytes sent*/
unsigned int sendUDP(unsigned char *data, unsigned int dataLength,unsigned int hisIP0,unsigned int hisIP1,unsigned int myPort,unsigned int hisPort);

/*
  Lower level interface.
*/
void receiveUDP(unsigned int UPDStart,unsigned int UDPLength,unsigned int hisIP0,unsigned int hisIP1,unsigned int myIP0,unsigned int myIP1);//UDPLENGTH is in bytes