the9rtyt / custom_mangopi

MangoPi MQ Pro Support

This is the base Nerves System configuration for the MangoPi MQ Pro.

This is a work in progress. It may change in backwards incompatible ways and the documentation might be lacking.

To do:

• Bring up WiFi
• Verify Blue PWM LED
• [?] Fix MicroSD flakiness on boot (seems much better now?)
• Verify USB host-only port (works with USB Flash drive)
• Fix USB gadget mode on OTG port
• Verify SPI (spidev1.0 and spidev1.1)
• Verify I2C
• Verify all GPIO work (GPIO inputs seem to work)
• Verify HW watchdog
• Check that TARGET_GCC_FLAGS are right
• Update Linux kernel to 5.18
• Implement A/B firmware updates work
• Use SID for serial number
• Reduce prints and shorten boot time
• Verify HDMI
• Verify camera

^{Image credit}

Feature	Description
CPU	1 GHz 64 bit RISC-V
Memory	512 MB or 1 GB DRAM
Storage	MicroSD
Linux kernel	5.19 w/ patches
IEx terminal	UART ttyS0
GPIO, I2C, SPI	Yes - Elixir Circuits
Display	Yes, but not supported yet
ADC	No
PWM	Yes, but no Elixir support
UART	ttyS0
Camera	Yes, but not supported yet
Ethernet	No
WiFi	Onboard WiFi
RTC	No
HW Watchdog	Yes

Using

The most common way of using this Nerves System is create a project with mix nerves.new and add mangopi references where needed and in a similar way to the default systems like bbb, etc. Then export MIX_TARGET=mangopi. 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.

Example use

This example assumes some familiarity with Nerves. To use this system, you'll need OTP 25. Follow the Nerves installation instructions for additional system dependencies.

Creating a new hello world application:

mix nerves.new hello_mango
cd hello_mango

Open up your mix.exs and add :mangopi_mq_pro to the @all_targets list at the top. It's ok to delete targets that you don't plan on using.

Then add the :nerves_system_mango_mq_pro dependency to the deps function:

    {:nerves_system_mangopi_mq_pro, "~> 0.1", runtime: false, targets: :mangopi_mq_pro},

This will load the latest released version. To use the latest code on the main branch here, add the following line:

    {:nerves_system_mangopi_mq_pro, runtime: false, targets: :mangopi_mq_pro, nerves: [compile: true], git: "https://github.com/fhunleth/nerves_system_mangopi_mq_pro", branch: "main"}

To build and write to a MicroSD card, run:

export MIX_TARGET=mangopi_mq_pro
mix deps.get
mix firmware
mix burn

Console access

The console is configured to output to the UART on pins 8 and 10 on the 40-pin GPIO connector. This is just like the Raspberry Pi. A 3.3V FTDI cable is needed to access the output.

Networking

The board has two network interfaces, a WiFi module and a virtual Ethernet on the USB C connector marked "OTG". If virtual Ethernet isn't working for you, try a different USB cable. You're welcome.

GPIO

The following table is a mapping between the logical GPIO numbers used in software (sysfs, Circuits.GPIO), and the pin numbers on the 20x2 Raspberry Pi header. For example, to control pin 11 you would open a connection to GPIO 117:

{:ok, pin} = Circuits.GPIO.open(117, :output)

GPIO	Pin	Pin	GPIO
	1	2
205	3	4
204	5	6
39	7	8	40
	9	10	41
117	11	12	37
118	13	14
32	15	16	33
	17	18	110
	19	20
	21	22	65
	23	24
	25	26	111
145	27	28	144
42	29	30
43	31	32	64
44	33	34
38	35	36	34
113	37	38	35
	39	40	36

Schematics and datasheets

• Schematics
• IBOM - Interactive web page to help you find what part is located where
• D1 documentation

Thanks

The most helpful Allwinner D1 information comes from linux-sunxi.org/Allwinner_Nezha. All of the work here wouldn't have been possible with out it. Thanks especially to smaeul's Allwinner D1 Linux fork

Here are more useful links:

• bret.dk's ARMBian post
• NixOS on D1
• YuzukiHD Buildroot
• DongshanPI Store

Image credit: This image is from mangopi.cc.