User manual

518
mikoC PRO for dsPIC
MikroElektronika
#dene putString SPI_Ethernet_putString
/*
* this function is called by the library
* the user accesses to the HTTP request by successive calls to Spi_Ethernet_getByte()
* the user puts data in the transmit buffer by successive calls to Spi_Ethernet_
putByte()
* the function must return the length in bytes of the HTTP reply, or 0 if nothing to
transmit
*
* if you don't need to reply to HTTP requests,
* just dene this function with a return(0) as single statement
*
*/
unsigned int SPI_Ethernet_UserTCP(unsigned char *remoteHost, unsigned int remotePort,
unsigned int localPort, unsigned int reqLength, TEthPktFlags *ags)
{
unsigned int len; // my reply length
// should we close tcp socket after response is sent?
// library closes tcp socket by default if canCloseTCP ag is not reset here
// ags->canCloseTCP = 0; // 0 - do not close socket
// otherwise - close socket
if(localPort != 80) // I listen only to web request on port 80
{
return(0);
}
// get 10 rst bytes only of the request, the rest does not matter here
for(len = 0; len < 10; len++)
{
getRequest[len] = SPI_Ethernet_getByte();
}
getRequest[len] = 0;
len = 0;
if(memcmp(getRequest, httpMethod, 5)) // only GET method is supported here
{
return(0);
}
httpCounter++; // one more request done
if(getRequest[5] == ‘s’) // if request path name starts with s, store
dynamic data in transmit buffer
{
// the text string replied by this request can be interpreted as javascript
statements
// by browsers
len = putConstString(httpHeader); // HTTP header
len += putConstString(httpMimeTypeScript); // with text MIME type