Polling of the Sn_SR register(s)

Candela12 · 2014-05-23T17:23:03+09:00

We are in the process of evaluating the W5200 using the W5200 pictail plus module + hardware stack + dspic33e mcu. We optimized/modified the provided sample code for the HW stack. We added functionality to use the hw interrupt pin for notification of incoming data. We use socket 0 (udp) for receiving data and socket 1 (udp) for outgoing data. In the provided sample code we observe extensive polling of the Sn_SR register(s) in the mainloop. We observe that the Sn_SR register of socket 0 always has the value of 22. Questions: Why is (extensive) polling of socket 0 Sn_SR needed? Except from a socket close, which conditions can cause a (not wanted) change of Sn_SR state?

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