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by TaylorAlexander 682 days ago
Do you have your code publicly available? I was just discussing with a friend it would be nice to add an optional Ethernet mode to my motor controller, but the limitations of this library or other approaches limit the appeal.

Also, are there any other approaches that might be better and would offer 100meg or even gigabit links with the RP2350? Thanks!
1 comments
rscott2049 681 days ago
I'm still working on it - hopefully will be on the DECstation2040 github soon. The interface uses the LAN8720/8740 MAC chips, which provide 10/100 Mbit. (I haven't tried 10 Mbit, so no idea if it works or not). FYI, here's a test result: ping -q -i 0.005 192.168.1.6 PING 192.168.1.6 (192.168.1.6) 56(84) bytes of data. 229501/229501 packets, 0% loss, min/avg/ewma/max = 0.063/76.725/88.698/160.145 ms 295393/295987 packets, 0% loss, min/avg/ewma/max = 0.063/76.792/37.003/160.171 ms 295393/296278 packets, 0% loss, min/avg/ewma/max = 0.063/76.792/37.003/160.171 ms

(Above is with killall -s QUIT ping) As you can see, it eventually hangs, and CMSIS reports: target halted due to breakpoint, current mode: Handler HardFault xPSR: 0x61000003 pc: 0x200001c4 msp: 0x20040f40

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rscott2049 679 days ago
If anybody is still following this thread, I fixed the problem: sudo ping -f 192.168.1.6 -s 1473 PING 192.168.1.6 (192.168.1.6) 1473(1501) bytes of data. 347751/347752 packets, 0% loss, min/avg/ewma/max = 0.573/0.625/0.628/1.002 ms 375962/375963 packets, 0% loss, min/avg/ewma/max = 0.573/0.625/0.626/1.002 ms 45876717/45876724 packets, 0% loss, min/avg/ewma/max = 0.570/0.626/0.630/3.972 ms ..^C --- 192.168.1.6 ping statistics --- 48237616 packets transmitted, 48237608 received, 1.65846e-05% packet loss, time 31011738ms rtt min/avg/max/mdev = 0.570/0.626/3.972/0.011 ms, ipg/ewma 0.642/0.627 ms

Turns out I wasn't passing the RX data properly to LWIP...

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vardump 677 days ago
So roughly 19 Mbps, up and down? Although I guess ping is not an optimal bandwidth test.
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