W5100s Sn_RX_WR wrap issue

Peter_Sti · 2025-03-01T22:01:23+09:00

How to use W5100s in persistance TCPIP Mode? The attempt to receive data in a persistant open socket (2k RX & TX size) ends as soon as the rx_wr pointer will reach the configured RX size. Expected (ring buffer) wrap arround does not happen! A test with all relevant informations below (in half duplex communication) , does receive 4 bytes and answers by a couple of more bytes till the RX Memory has been filled as follow: after W5100_SKT_SR_ESTABLISHED: ReceivedSize() socket: 0, size: 4 Receive() socket: 0x0 baseaddr: 0x400 realaddr: 0x6000, rx_rd_addr: 0x0, rx_wr_addr: 0x4 W51_readBurst() rx_rd_addr: 0x4, rx_wr_addr: 0x4 rcv: 0x42, 0x02, 0x08, 0x09, rd_buf: 4540 pb : 0x1A, 0x5B, 0x08, 0x05, 0x10, 0x0B, .... Send(pb) socket: 0x0 baseaddr: 0x400 ReceivedSize() socket: 0, size: 4 Receive() socket: 0x0 baseaddr: 0x400 realaddr: 0x6004, rx_rd_addr: 0x4, rx_wr_addr: 0x8 W51_readBurst() rx_rd_addr: 0x8, rx_wr_addr: 0x8 rcv: 0x42, 0x02, 0x08, 0x09, rd_buf: 4540 pb : 0x1A, 0x5B, 0x08, 0x05, 0x10, 0x0B, .... Send(pb) socket: 0x0 baseaddr: 0x400 .... (508 times) ReceivedSize() socket: 0, size: 4 Receive() socket: 0x0 baseaddr: 0x400 realaddr: 0x67F8, rx_rd_addr: 0x7F8, rx_wr_addr: 0x7FC W51_readBurst() rx_rd_addr: 0x7FC, rx_wr_addr: 0x7FC rcv: 0x42, 0x02, 0x08, 0x09, rd_buf: 4540 pb : 0x1A, 0x5C, 0x08, 0x05, 0x10, 0x0B, ... Send(pb) socket: 0x0 baseaddr: 0x400 ReceivedSize() socket: 0, size: 4 Receive() socket: 0x0 baseaddr: 0x400 realaddr: 0x67FC, rx_rd_addr: 0x7FC, rx_wr_addr: 0x800 W51_readBurst() rx_rd_addr: 0x0, rx_wr_addr: 0x800 rcv: 0x42, 0x02, 0x08, 0x09, rd_buf: 4540 pb : 0x1A, 0x5C, 0x08, 0x05, 0x10, 0x0B, ... ~ 100Byte Send(pb) socket: 0x0 baseaddr: 0x400 ReceivedSize() socket: 0, size: 800 Receive() socket: 0x0 baseaddr: 0x400 realaddr: 0x6000, rx_rd_addr: 0x0, rx_wr_addr: 0x800 W51_readBurst() rx_rd_addr: 0x0, rx_wr_addr: 0x800 rcv: 0x42, 0x02, 0x08, 0x09, 0x42, 0x02, 0x08, 0x09, 0x42, 0x02, 0x08, 0x09, ... (2kByte) ... 0x42, 0x02, 0x08, 0x09, 0x42, 0x02, 0x08, 0x09, 0x42, 0x02, 0x08, 0x09, 0x42, 0x02, 0x08, 0x00, What needs to be done to wrap arround? And there is any other issue can't be explained, the byte on rx_rd_addr: 0x7FF is incorrect.

Ethernet Chips

by Peter_Sti 2025-03-01 22:01

RE: W5100s Sn_RX_WR wrap issue

by WIZnet AI AI generated 2025-03-01 22:01

RE: RE: W5100s Sn_RX_WR wrap issue

by louis_m 2025-03-06 13:43