Mikroelektronika MIKROE-738 Datenbogen

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SPI_Ethernet_UserUDP

unsigned int SPI_Ethernet_UserUDP(unsigned char *remoteHost, unsigned int 

remotePort,  unsigned  int  localPort,  unsigned  int  reqLength,  TEthPktFlags 

*flags);

Description This is UDP module routine. It is internally called by the library. The user accesses to the UDP request 

by using some of the SPI_Ethernet_get routines. The user puts data in the transmit buffer by using 

some of the SPI_Ethernet_put routines. The function must return the length in bytes of the UDP reply, 

or 0 if nothing to transmit. If you don’t need to reply to the UDP requests, just define this function with 

a return(0) as single statement.

Parameters - 

remoteHost

: client’s IP address. 

- 

remotePort

: client’s port. 

- 

localPort

: port to which the request is sent. 

- 

reqLength

: UDP request data field length. 

- 

flags

: structure consisted of two bit fields :  

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typedef struct {

  unsigned canCloseTCP: 1;  // flag which closes TCP socket (not relevant 

  unsigned isBroadcast: 1;  // flag which denotes that the IP package has 

} TEthPktFlags;

- 

0

 - there should not be a reply to the request. 

- Length of UDP reply data field - otherwise. 

Ethernet module has to be initialized. See SPI_Ethernet_Init.

This function is internally called by the library and should not be called by the user’s code.

The function source code is provided with appropriate example projects. The code should be adjusted 

by the user to achieve desired reply.