W5200 datasheet(70/88 Pages) WIZNET

70 / 88 page

{

START:

/* sets MAC raw mode with enabling MAC filter */

S0_MR = 0x44;

/* sets OPEN command */

S0_CR = OPEN;

/* wait until Sn_SR is changed to SOCK_MACRAW */

if (Sn_SR != SOCK_MACRAW) S0_CR = CLOSE; goto START;

}

▪If the free size of the internal RX memory is smaller than ‘1528 - Default MTU(1514)+PACKET

INFO(2) + DATA packet(8) + CRC(4)’, close the SOCKET and process all received data. Then

reopen the SOCKET. After closing the SOCKET, the received MACRAW data from closing time

can be lost.

{

/* check the free size of internal RX memory */

if((Sn_RXMEM_SIZE(0) * 1024) - Sn_RX_RSR0(0) < 1528)

{

recved_size = Sn_RX_RSR0(0);

/* backup Sn_RX_RSR */

Sn_CR0 = CLOSE;

/* SOCKET Closed */

while(Sn_SR != SOCK_CLOSED);

/* wait until SOCKET is closed */

/* process all data remained in internal RX memory */

while(recved_size> 0)

{/* calculate offset address */

src_mask = Sn_RX_RD&gSn_RX_MASK;

// src_mask is offset address

/* calculate start address(physical address) */

src_ptr = gSn_RX_BASE + src_mask; // src_ptr is physical start address

/* if overflow SOCKET RX memory */

If((src_mask + len) > (gSn_RX_MASK + 1))

{

/* copy upper_size bytes of get_start_address to destination_address */

upper_size = (gSn_RX_MASK + 1) – src_mask;

memcpy(src_ptr, dst_addr, upper_size);

/* update destination_address */

dst_address += upper_size;

/* copy left_size bytes of gSn_RX_BASE to destination_address */

left_size = len – upper_size;

memcpy(src_ptr, dst_addr, left_size);

}

W5200 Datasheet(PDF) 70 Page - WIZnet Co., Ltd

W5200 Datasheet(HTML) 70 Page - WIZnet Co., Ltd

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