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W5200 Datasheet(PDF) 53 Page - WIZnet Co., Ltd |
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W5200 Datasheet(HTML) 53 Page - WIZnet Co., Ltd |
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53 / 88 page ![]() © Copyright 2013 WIZnet Co.,Ltd. All rights reserved. 53 ESTABLISHMENT: Timeout The timeout can occur by Connect-request(SYN packet) or its response(SYN/ACK packet), the DATA packet or its response(DATA/ACK packet), the Disconnect-request(FIN packet) or its response(FIN/ACK packet) and transmission all TCP packet. If it cannot transmit the above packets within ‘timeout’ which is configured at RTR and RCR, the TCP final timeout(TCPTO) occurs and the state of Sn_SR is set to SOCK_CLOSED. Confirming method of the TCPTO is as below: First method : { if (Sn_IR(TIMEOUT bit) == ‘1’) Sn_IR(TIMEOUT)=‘1’; goto CLOSED stage; /* In this case, if the interrupt of Socket n is activated, interrupt occurs. Refer to IR, IMR Sn_IMR and Sn_IR. */ } Second method : { if (Sn_SR == SOCK_CLOSED) goto CLOSED stage; } SOCKET Close It can be used to close the Socket n , which disconnected by disconnect-process, or closed by TCPTO or closed by host’s need without disconnect-process. { /* clear the remained interrupts of Socket n */ Sn_IR = 0xFF; IR(n) = ‘1’; /* set CLOSE command */ Sn_CR = CLOSE; } |
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