Overblog Suivre ce blog
Editer la page Administration Créer mon blog
Xtase & Androids

Tiny ARM-based linux computer/console

the small form factor of AriettaG25
the small form factor of AriettaG25

A few months ago, I met a little cheap ARM-based board called Arietta-G25 (available for 36euros in France @lextronic.fr), It has no HDMI ouput & no direct AUDIO output neither ; but the lack of pre-soldered GPIO HEADER allow it to be one of smallest & thinest board that I found.

It's recognized as an ethernet card/Linux Gadget as soon as you plug it to your PC USB (but no signed drivers for W10, so try with Win7 or better : a Linux box ;) )

It take me a couple of nights to have the wanted distro with good kernel headers, but now I have a stable system which run a Debian w/ a 4.4.13 kenel.

For a simple usage, you will find some pre-brewed SDcard image files here.

default (modifiable) pinout
default (modifiable) pinout

Another good point is the ~dynamic pin mapping for the GPIO pins

and the ability to wire USB Host connectors directly (#1 is linked to microUSB, #2 is linked to an optional wifi module (that I never be able to use...), #3 is free & full speed)

Now, any console need a screen !

The firm website sales an 'XTERM' called screen & offers a tutorial to add an Adafruit TFT 2.8 touchscreen (driven by the SPI interface) ( ili9341 240x320px )

I look for similar screen -but- built for Raspberry, & discovered that they uses SPI too, I just had to adapt pinout (/!\ 3.3v logical levels) and find the good compatible module/screen for my kernel

Here : an ili9488 480x320px (that's why I wanted to have the good kernel headers version)

BUT beware : the more the screen/resolution is high the slowest it runs ;(

(for example the Adafruit TFT 2.8 supports DOOM demo, the Kufmann 3.5 lags)

my 1st board (Screen, USBs & Arietta)
my 1st board (Screen, USBs & Arietta)

W/ my USBs & my screen, I start to make a circuit on a perfboard...

My 1st Ugly PAD interface
My 1st Ugly PAD interface

Now, any console need a pad !

Ok, it's not really a game console, but It can emulate (w/ some program of my own) CHIP-8, GB, play some Raycasters (poor DOOM-like).

So I needed pad for these usages & to navigate into system menus (that I made too)

In order to do this & save a maximum of GPIO pins, I deferred this work to a dedicated Arduino ProMini 3.3v 8MHz (AT328P) which samples the pad & returns result to the Arietta by an RX/TX line (/!\ 3.3v logical levels).

all parts just assembled
all parts just assembled

Then I was ready to test the whole ...

Now any console need a case !

whole in the box
whole in the box

well OK, I'm not the cleanest box builder, but it works...

If you want to know more about programming this box (ARM side or Arduino Side)

Please let me a comment or a message ...

Partager cette page

Repost 0