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| From bottom: ENC28J60 SPI Ethernet Controller, Raspberry Pi 3 B and 5V 6A power module |
As is often the case it turned out it is easier to test the ENC28J60 using a Raspberry Pi. Usually because the software is easily available, but in this case because TheSpotShed has a great writeup on it. My board is a little different from his, but even so it worked first time, so for more details hie you hence to TheSpotShed.
Now a late-model Pi is far from a tiddly microcontroller, and we often forget that the Network Stack takes up more than one third of the 15-million plus lines of Linux kernel source code. It is a measure of how far we have come to even consider implementing networking in an embedded microcontroller system. Besides being a slam-dunk, implementing it for a Pi lets you gauge where the bottlenecks are: the SPI interface, the LAN controller or the microcontroller.
My ENC28J50 board had different pinout from the one in TheSpotShed, and it runs on 5V instead of 3.3V. There are a few spelling errors, e.g. LNT instead of INT, SL instead SI
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| I bought my ENC28J60 from lelong.com.my's enewground before it was removed from sale |
Pi ENC28J60 Colour
------------------------------------------------
+3V3 VCC Brown <--- Note my PCB is *5V*
GPIO10/MOSI SI Grey
GPIO9/MISO SO Green
GPIO11/SCLK SCK Purple
GND GND Red
GPIO25 INT Orange
CE0#/GPIO8 CS Black
Working from 5V also meant that my 10-way Molex header (SL Modular Connector, 70066 Series IDC/IDT 2.54mm) no longer sufficed. I had to run a couple of easyhooks to the top of the Raspberry Pi header for my 5V. Other than that, everything worked on the first try, so kudos to TheSpotShed.
First I checked for the enc28j60.dtbo overlay:
# mount /dev/mmcblk0p1 /mnt/flash
# ls -l /mnt/flash/overlays/enc*
-rwxr-xr-x 1 root root 1403 Nov 19 2018 /mnt/flash/overlays/enc28j60.dtbo
-rwxr-xr-x 1 root root 1279 Nov 19 2018 /mnt/flash/overlays/enc28j60-spi2.dtbo
It is not only there but very promisingly there looks to be provision for a second spi interface, spi2.
A quick edit of /boot/config.txt to add:
dtparam=spi=on
dtoverlay=enc28j60
And on reboot, it came up immediately as eth1:
# ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet xx.xx.xx.xx netmask 255.255.255.0 broadcast xx.xx.xx.255
ether b8:27:eb:a4:ab:0b txqueuelen 1000 (Ethernet)
RX packets 85 bytes 9631 (9.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 68 bytes 8877 (8.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 4e:cd:f6:c2:4e:3a txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 167
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet zz.zz.zz.zz netmask 255.255.0.0 broadcast zz.zz.255.255
ether b8:27:eb:f1:fe:5e txqueuelen 1000 (Ethernet)
RX packets 22 bytes 2202 (2.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 26 bytes 3454 (3.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
On connecting it to my modem router the link came up immediately. I tested it with Youtube with Firefox, and it pretty much ran a full HD (1080p) music video, with the odd hiccup or two. But overall very impressive throughput, compared to my previous SPI link to my SIM7000C 3G modem.
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| Sistar's 'Give it to Me' in fullscreen mode is a brutal workout for anything less than a Linux workstation |
The next thing to do would be to hook the ENC28J60 to an ESP8266, but that is another blog post, so watch this space.
Keep safe, and Happy Trails.
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