W5100 datasheet(45/72 Pages) WIZNET

45 / 72 page

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ESTABLISHED : Received Data ?

Check as below to know if data is received from remote peer or not.

First method :

{

If (Sn_IR(RECV bit) == ‘1’) goto Receiving Process stage;

/* In this case, if the interrupt of Socket n is activated, interrupt occurs. Refer to

Interrupt Register(IR), Interrupt Mask Register (IMR) and Socket n Interrupt Register

(Sn_IR). */

}

Second Method :

{

if (Sn_RX_RSR != 0x0000) goto Receiving Process stage;

}

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ESTABLISHED : Receiving Process

Received data can be processed as below.

{

/* first, get the received size */

get_size = Sn_RX_RSR;

/* calculate offset address */

get_offset = Sn_RX_RD & gSn_RX_MASK;

/* calculate start address(physical address) */

get_start_address = gSn_RX_BASE + get_offset;

/* if overflow socket RX memory */

if ( (get_offset + get_size) > (gSn_RX_MASK + 1) )

{

/* copy upper_size bytes of get_start_address to destination_addr */

upper_size = (gSn_RX_MASK + 1) – get_offset;

memcpy(get_start_address, destination_addr, upper_size);

/* update destination_addr*/

destination_addr += upper_size;

/* copy left_size bytes of gSn_RX_BASE to destination_addr */

left_size = get_size – upper_size;

W5100 Datasheet(PDF) 45 Page - WIZnet Co., Ltd