This is the base Nerves System configuration for the A64-OLinuXino
| Feature | Description |
|---|---|
| CPU | Allwinner A64 - 1.2 GHz Quad-Core ARM Cortex-A53 64-bit |
| Memory | 1GB or 2GB RAM DDR3L @ 672Mhz |
| Storage | MicroSD (eMMC not supported) |
| Linux kernel | 5.2 mainline |
| IEx terminal | UART ttyS0 |
| GPIO, I2C, SPI | Yes, I2C and SPI on UEXT |
| ADC | No |
| PWM | No |
| UART | ttyS0 + ttyS2 on UEXT |
| Camera | None |
| Ethernet | Yes |
| WiFi | RTL8723BS on board (some board configurations). Other requires USB WiFi dongle/driver |
| HW Watchdog | sunxi watchdog available |
| Power Management | AXP803 driver available - support for battery and ac charger status |
The most common way of using this Nerves System is create a project with mix nerves.new and to export MIX_TARGET=a64_olinuxino. 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.
The console is configured to output to the 6 pin header on the
A64-OLinuXino that's labeled DBG_UART. A 3.3V FTDI cable is needed to access the output.
This system supports storing provisioning information in a small key-value store outside of any filesystem. Provisioning is an optional step and reasonable defaults are provided if this is missing.
Provisioning information can be queried using the Nerves.Runtime KV store's
Nerves.Runtime.KV.get/1
function.
Keys used by this system are:
| Key | Example Value | Description |
|---|---|---|
nerves_serial_number |
"12345678" |
By default, this string is used to create unique hostnames and Erlang node names. If unset, it defaults to part of the Etherner MAC Address. |
The normal procedure would be to set these keys once in manufacturing or before deployment and then leave them alone.
For example, to provision a serial number on a running device, run the following and reboot:
iex> cmd("fw_setenv nerves_serial_number 12345678")This system supports setting the serial number offline. To do this, set the
NERVES_SERIAL_NUMBER environment variable when burning the firmware. If you're
programming MicroSD cards using fwup, the commandline is:
sudo NERVES_SERIAL_NUMBER=12345678 fwup path_to_firmware.fwSerial numbers are stored on the MicroSD card so if the MicroSD card is replaced, the serial number will need to be reprogrammed. The numbers are stored in a U-boot environment block. This is a special region that is separate from the application partition so reformatting the application partition will not lose the serial number or any other data stored in this block.
Additional key value pairs can be provisioned by overriding the default provisioning.conf
file location by setting the environment variable
NERVES_PROVISIONING=/path/to/provisioning.conf. The default provisioning.conf
will set the nerves_serial_number, if you override the location to this file,
you will be responsible for setting this yourself.
All parts of UEXT port are enabled and supported.
SPI is on spidev0.0
I2c is on i2c-0
UART is on ttyS1
For GPIO access use circuits_cdev.
All GPIOs are on gpiochip2.
Use following formula to calculate proper GPIO number from pin name (like PE0):
(position of letter in alphabet - 1) * 32 + pin number
For
PE0this would be '4 * 32 + 0 = 128'
If you have included circuits_spi as a dependency, you can start it now and test a transfer:
The example below should work without any additional hardware connected to the OLinuXino. If you have SPI hardware connected to the OLinuXino, your returned binary might be different.
iex> {:ok, ref} = Circuits.SPI.open("spidev0.0")
{:ok, #Reference<...>}
iex> Circuits.SPI.transfer(ref, <<1,2,3,4>>)
<<0, 0, 0, 0>>If you have included circuits_i2c as a dependency, you can use it to scan for devices:
iex> Circuits.I2C.detect_devices()
Devices on I2C bus "i2c-0":
Onboard audio input and output is supported and is set as default in ALSA.
To use it, you first need to enable it.
To enable output execute:
System.cmd("amixer", ["-q", "sset", "AIF1 Slot 0 Digital DAC", "on"])
System.cmd("amixer", ["-q", "sset", "Headphone", "100%", "on"])To enable microphone input execute
System.cmd("amixer", ["-q", "sset", "AIF1 Data Digital ADC", "cap", "on"])
System.cmd("amixer", ["-q", "sset", "Mic1", "43%", "cap", "on"])Some boards has built in RTL8723BS. This module is not always very reliable and the signal strength is problematic due to on board antenna design.
Various USB WIFI dongle are supported. Recommended and tested ones are USB adapters supported by rt2800usb driver (Ralink RT2070, RT2770, RT2870, RT3070, RT3071, RT3072, RT3370, RT3572, RT5370, RT5372, RT5572).
If you're new to Nerves, check out the nerves_init_gadget project for creating a starter project for the A64-OLinuXino boards.
It will get you started with the basics like bringing up the virtual Ethernet interface, initializing the application partition, and enabling ssh-based firmware updates.