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W5100 Datasheet(PDF) 46 Page - WIZnet Co., Ltd

Part # W5100
Description  Single-chip Internet-enabled 10/100 Ethernet Controller
PDF  72 Pages
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Manufacturer  WIZNET [WIZnet Co., Ltd]
Direct Link  https://www.wiznet.io/ko/Product/
Logo WIZNET - WIZnet Co., Ltd

W5100 Datasheet(HTML) 46 Page - WIZnet Co., Ltd

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© Copyright 2009-2011 WIZnet Co., Inc. All rights reserved.
45
memcpy(gSn_RX_BASE, destination_addr, left_size);
}
else
{
/* copy get_size bytes of get_start_address to destination_addr */
memcpy(get_start_address, destination_addr, get_size);
}
/* increase Sn_RX_RD as length of get_size */
Sn_RX_RD += get_size;
/* set RECV command */
Sn_CR = RECV;
}
◼
ESTABLISHED : Send DATA ? / Sending Process
The sending procedure is as below.
{
/* first, get the free TX memory size */
FREESIZE:
get_free_size = Sn_TX_FSR;
if (get_free_size < send_size) goto FREESIZE;
/* calculate offset address */
get_offset = Sn_TX_WR & gSn_TX_MASK;
/* calculate start address(physical address) */
get_start_address = gSn_TX_BASE + get_offset;
/* if overflow socket TX memory */
if ( (get_offset + send_size) > (gSn_TX_MASK + 1) )
{
/* copy upper_size bytes of source_addr to get_start_address */
upper_size = (gSn_TX_MASK + 1) – get_offset;
memcpy(source_addr, get_start_address, upper_size);
/* update source_addr*/
source_addr += upper_size;
/* copy left_size bytes of source_addr to gSn_TX_BASE */
left_size = send_size – upper_size;



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