History of Nerves

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Revision 12 . . December 22, 2019 10:04 am by 78-93-98-198.dsl.wavetel.us
Revision 11 . . April 5, 2017 6:57 pm by 133-94-98-198.dsl.wavetel.us
  

Difference (from prior major revision) (no other diffs)

Changed: 1,101c1

Nerves




building firmware for embedded Elixir

How to print out MAC address
`File.read! "/sys/class/net/eth0/address"` or use nerves project `nerves_networking` dependency.
https://github.com/nerves-project/nerves_networking/blob/master/lib/networking/subsystem.ex#L56

Using Screen to connect to RPi3

https://github.com/ssachse/my_elixir_notes/blob/master/README.md#how-do-i-use-erlang-observer-on-the-nerves-target-

Wifi




http://www.microcenter.com/product/458213/150mbs_80211_B-G-N_Wireless_LAN_USB_20_Adapter_compatible_with_Raspberry_Pi is supported - RT2800

Known issues with 8192? https://github.com/pvaret/rtl8192cu-fixes

Checking whether wifi is up/working:


defp wait_for_wifi() do
:timer.sleep 500
case Nerves.NetworkInterface.settings("wlan0") do
{:ok, _} -> :done
_ -> wait_for_wifi
end
end


pkazmier [8:15 PM]
I got the idea from a comment from @fhunleth here:
https://github.com/nerves-project/nerves_interim_wifi/issues/1#issuecomment-244620159

Chocolate




wsmoak [9:16 PM]
so do I owe anyone that chocolate, did anyone get one or both of my wifi adapters working on RPi2 ?

gregmefford [9:18 PM]
@wsmoak LOL - I think they might be both supported by default now, but you have to `modprobe` a driver to activate it.

gregmefford [9:20 PM]
Oh wait, is it this? Looks like it's not merged yet but I thought it was: https://github.com/nerves-project/nerves_system_rpi2/pull/6/files

[9:21]
Ah, this is the one I was thinking about that got merged longer ago: https://github.com/nerves-project/nerves_system_rpi/pull/8

[9:22]
So I think if those are the ones you're talking about, @alfert gets the chocolate, assuming you can get it working and/or wait for the next `rpi2` system release. :wink:

Umbrella Project




@misiek - btw is someone is interested seems to be working… my (sample) main umbrella mix.exs:


defmodule Nervy.Mixfile do
use Mix.Project

def project do
[
apps_path: "apps",
archives: [nerves_bootstrap: "~> 0.1.4"],
build_embedded: Mix.env == :prod,
start_permanent: Mix.env == :prod,
deps: deps,
aliases: aliases
]
end

defp deps do
[]
end

def aliases do
["deps.precompile": ["nerves.precompile", "deps.precompile"],
"deps.loadpaths": ["deps.loadpaths", "nerves.loadpaths"]]
end

end



paulwilson [3:10 AM]
@misiek It is possible to set it up so that you can build for the host as well as the target, but it does take a bit of massaging. I’ll write it up in the next few days, but here’s an example. https://github.com/CultivateHQ/cultivatarmobile/blob/master/apps/fw/mix.ex
[3:11]
A key difference is that to build for the target you need to set the `MIX_ENV` to prod. eg

```
MIX_ENV=prod mix release
MIX_ENV=prod mix release.burn
```

[3:12]
That way you can build and test from the root of the umbrella. (Note the `dummy_nerves` project that fakes out target specific things)

NervesSystem

NTP



after your connection is established you have to do something along the lines of `System.cmd("ntpd", ["-q", "-p", "pool.ntp.org"])`
this is on rpi3 btw


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