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====== 2.1.3 Setup Operating System onto the Orange Pi Zero 2 ======

===== Foreword =====

The //Orange Pi Zero 2// hardware looks to be an interesting and //available// Single Board Computer (SBC). See [[http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-Zero-2.html|http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-Zero-2.html]] for the hardware details.

[ i ordered from [[https://de.aliexpress.com/item/1005002002861625.html|https://de.aliexpress.com/item/1005002002861625.html]] with a plastic case for approx 40 EUR - including delivery in May 2022 ]


==== USB-Hub ====

With one single USB jack, you'll need an USB-Hub to connect multiple USB devices (RTL-SDR dongle, GPS-Mouse and additional micro-SD card).

Unfortunately, the first two USB-2.0-Hubs, i tested, didn't work: data-transfer from RTL-SDR (reception) did break the connection. I assume, that higher power consumption is the reason. Not sure.

With following devices, the connection looks good:
  * https://www.amazon.de/gp/product/B09Z2128H7
  * https://www.amazon.de/gp/product/B09Q2P3NZZ


==== Not working builtin components ====

Be aware, that following things are **NOT** working with Linux:

  * Mali GPU
  * Video codec

The info about that can be found - sort of hidden - in the User Manual in chapter 3.2 ''Linux4.9 kernel driver adaptation status'' of the file ''orangepi zero2_h616_user manual_v1.6.pdf''.
Happily, none of these are necessary for the FMLIST-Scanner.


==== Wiring ====

Wiring (ATX-buttons, LEDs or Piezo-buzzer) is tested meanwhile - but with **not so good** results:


== Output / LEDs ==

Using [[https://github.com/orangepi-xunlong/wiringOP|https://github.com/orangepi-xunlong/wiringOP]] can set output pins, e.g. LEDs. This does work.


== Tone output / Piezo buzzer ==

Ideally, this is done utilizing hardware PWM support - to save CPU interrupts.
But i could not find any GPIO pin, capable of hardware PWM.
Software/emulated PWM for the buzzer might work - haven't tested so far.


== Input / ATX-knobs ==

Sensing/reading GPIO input with internal pull-up/down resistors doesn't work with the WiringOP library.
This, ATX-button won't give correct state - without external resistors. See [[https://kalitut.com/raspberrypi-gpio-pull-up-pull-down-resistor/|https://kalitut.com/raspberrypi-gpio-pull-up-pull-down-resistor/]], how external resistor would need to be wired. I didn't try for now.

Upload of result - by pressing the button - won't work. \\ 
But, shutdown and reboot can be performed with the builtin //power switch//.

== Resume ==

Happily, at least for static (non-mobile) use, you won't need any of LEDs, buzzer or ATX-knobs.\\ 
Buzzer and LEDs are nice to see/hear some progress, but you can go mobile without .. and check progress through an internet connection over phone/tablet and WiFi.

==== Temperature ====

I would recommend some heatsinks for the CPU - as temperature does
temporarily rise over 80°C. \\ 
Ideally, i'd also suggest a CPU fan, but
couldn't find a suitable housing.


===== Download the image =====

Orange Pi does provide a //Debian Image// for the //Orange Pi Zero 2// at [[http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/service-and-support/Orange-Pi-Zero-2.html|http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/service-and-support/Orange-Pi-Zero-2.html]].

There are also some //Ubuntu// images ; but i did only try the latest Debian one from May 9th 2022. An older Ubuntu image failed running ''rtl_test'' and ''rtl_sdr''.

Following the //Debian// download link to Google Drive, choose \\ 
''Orangepizero2_3.0.0_debian_bullseye_server_linux5.16.17.7z'' \\ 
(as i did), cause the scanner doesn't need a desktop. 


===== Write to micro-SD card =====

Please follow the instructions in chapter 2 ''Instructions to use the development board'' of the user manual  to write the image to a micro-SD card.


===== First boot from micro-SD card =====

You should be able to boot and login with one of following user accounts as described in the user manual

^ User     ^ Password ^
| root     | orangepi |
| orangepi | orangepi |

i strongly recommend to change the default passwords!

Default hostname is ''orangepizero2''.

You should be able to connect with
<code>
ssh orangepi@orangepizero2
</code>


===== Connecting multiple devices through an USB-Hub =====

It depends on the USB-Hub, if devices can be resetted .. and run flawlessly afterwards.\\
With a tested USB-Hub, after a ''resetScanDevice.sh'', the device was listed but freezed on ''rtl_test'' and ''rtl_sdr''. In the scanner configuration file, ''FMLIST_SCAN_RESET_DEVICE'' needs to be disabled.\\
''FMLIST_SCAN_DEAD_REBOOT'' might be enabled instead.

**anyway, i could NOT run ''rtl_sdr'' at all, when using an USB-Hub!!!**\\
i could run the scanner, when connecting the RTL-SDR dongle directly to the //Orange Pi Zero 2//,
having no free USB jack to connect GPS mouse or a memory-stick!

If you intend to use the scanner installed at a fixed place, e.g. at you home, you won't need to connect a GPS mouse, by configuring the GPS coordinates manually. And, i'd dislike, but you could write the results directly onto the same SD-card - as the OS, by configuring ''FMLIST_SCAN_MOUNT="0"'' and setting ''FMLIST_SCAN_RESULT_DIR''.\\
However, i would prefer an Orange Pi 3 LTS for a slightly higher price.

===== System Update & Configuration =====

Please continue with [[fmlist_scanner:prepare_exisiting_linux_or_preinstalled_pi|2.2 Setup on a pre-installed Pi or PC]]