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W5200 Datasheet(PDF) 51 Page - WIZnet Co., Ltd

Part # W5200
Description  Microcontroller
PDF  88 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  WIZNET [WIZnet Co., Ltd]
Direct Link  https://www.wiznet.io/ko/Product/
Logo WIZNET - WIZnet Co., Ltd

W5200 Datasheet(HTML) 51 Page - WIZnet Co., Ltd

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WIZnet Co.,Ltd. All rights reserved.
51
FREESIZE:
freesize = Sn_TX_FSR;
if (freesize<len) goto FREESIZE;
// len is send size
/* calculate offset address */
dst_mask= Sn_TX_WR0 &gSn_TX_MASK;
// dst_mask is offset address
/* calculate start address(physical address) */
dst_ptr = gSn_TX_BASE + dst_mask;
// destination_address is physical start address
/* if overflow SOCKETTX memory */
if ( (dst_mask + len) > (gSn_TX_MASK + 1) )
{
/* copy upper_size bytes of source_addr to destination_address */
upper_size = (gSn_TX_MASK + 1) – dst_mask;
memcpy(src_addr, dst_ptr, upper_size);
/* update source_addr*/
source_addr += upper_size;
/* copy left_size bytes of source_addr to gSn_TX_BASE */
left_size = len – upper_size;
memecpy(source_addr, gSn_TX_BASE, left_size);
}
else
{
/* copy len bytes of source_addr to destination_address */
memcpy(source_addr, dst_ptr, len);
}
/* increase Sn_TX_WR as length of len */
Sn_TX_WR0 += send_size;
/* set SEND command */
Sn_CR = SEND;
/* return real packet size */
return ( read_ptr_after_send - read_ptr_befor_send )
/* if return value is not equal len (len is send size),
retry send left data without copying data*/
}



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