A port of uIP 0.9 (a minimal TCP/IP stack and web server) to PicoSoC (a RISC-V SoC for the iCE40 HX8K breakout board based on the PicoRV32 CPU). It uses the Serial Line Internet Protocol (SLIP) to send IP packets over the serial port to the host computer.
Run git submodule update --init to clone a patched copy of PicoSoC. The
changes are minimal: the size of the SRAM was bumped to 8 KiB and the frequency
was bumped to 24 MHz.
Configure the jumpers on the breakout board for flash programming and then run
make flash.
Run the following commands as root to create the SLIP interface:
slattach -L -p slip -s 57600 /dev/ttyUSB1 &
ip addr add 192.168.0.1 peer 192.168.0.2 dev sl0
ip link set mtu 1500 up dev sl0
The path to the serial port may vary depending on your system.
Pinging the board should then work:
$ ping -c 4 192.168.0.2
PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data.
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=55.1 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=61.8 ms
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=52.1 ms
64 bytes from 192.168.0.2: icmp_seq=4 ttl=64 time=58.8 ms
--- 192.168.0.2 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 52.120/56.990/61.844/3.682 ms
$
as should fetching a page from the web server:
$ curl http://192.168.0.2
<html>
<head><title>uIP web server test page</title></head>
<frameset cols="*" rows="120,*" frameborder="no">
<frame src="control.html">
<frame src="about.html" name="main">
</frameset>
<noframes>
<body>
Your browser must support frames
</body>
</noframes>
</html>
$
If you're brave you can also try visiting http://192.168.0.2 in your web
browser. This doesn't seem to work as well as curl - I think it's because
modern web browsers send lots of headers.
After a few tries you should see the index page:
The "CGI" pages don't work. I'm not sure why - I suspect that the PicoSoC isn't fast enough to keep up, or perhaps there's a bug somewhere in uIP's web server (the C code is rather old and crufy!)
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