Raspberry Pi 2 Model B
This is the base Nerves System configuration for the Raspberry Pi 2 Model B.
| Feature | Description |
|---|---|
| CPU | 900 MHz quad-core ARM Cortex-A7 |
| Memory | 1 GB DRAM |
| Storage | MicroSD |
| Linux kernel | 4.4 w/ Raspberry Pi patches |
| IEx terminal | HDMI and USB keyboard (can be changed to UART) |
| GPIO, I2C, SPI | Yes - Elixir ALE |
| ADC | No |
| PWM | Yes, but no Elixir support |
| UART | 1 available - ttyAMA0 |
| Camera | Yes - via rpi-userland |
| Ethernet | Yes |
| WiFi | Requires USB WiFi dongle |
| Bluetooth | Not supported |
Using
The most common way of using this Nerves System is create a project with mix nerves.new and to export MIX_TARGET=rpi2. See the Getting started
guide
for more information.
If you need custom modifications to this system for your device, clone this repository and update as described in Making custom systems
If you're new to Nerves, check out the nerves_init_gadget project for creating a starter project. It will get you started with the basics like bringing up networking, initializing the writable application data partition, and enabling ssh-based firmware updates. It's easiest to begin by using the wired Ethernet interface 'eth0' and DHCP.
Supported USB WiFi devices
The base image includes drivers and firmware for Ralink RT53xx
(rt2800usb driver), RealTek RTL8712U (r8712u driver) and
RealTek RTL 8192 (rtl8192cu driver) devices (e.g. Edimax USB WiFi dongles).
We are still working out which subset of all possible WiFi dongles to support in our images. At some point, we may have the option to support all dongles and selectively install modules at packaging time, but until then, these drivers and their associated firmware blobs add significantly to Nerves release images.
If you are unsure what driver your WiFi dongle requires, run Raspbian and configure WiFi
for your device. At a shell prompt, run lsmod to see which drivers are loaded.
Running dmesg may also give a clue. When using dmesg, reinsert the USB
dongle to generate new log messages if you don't see them.
Linux kernel and RPi firmware/userland
There's a subtle coupling between the nerves_system_br version and the Linux
kernel version used here. nerves_system_br provides the versions of
rpi-userland and rpi-firmware that get installed. I prefer to match them to
the Linux kernel to avoid any issues. Unfortunately, none of these are tagged
by the Raspberry Pi Foundation so I either attempt to match what's in Raspbian
or take versions of the repositories that have similar commit times.
Image credit: This image is from the Fritzing parts library.