Chiu

un elaboratore tascabile

Hardware

Cpu

• Orange Pi Zero Plus2 (schematic)

Display

• Risoluzione: 320x240 ILI9341 (40x30)
• Risoluzione: 480x320 ILI9486
• Bus: SPI

• https://marcosgildavid.blogspot.com/2014/02/getting-ili9341-spi-screen-working-on.html
• https://github.com/juj/fbcp-ili9341

ili9341	OPi	Note	GPIO
SCK	23	SCLK	14
MOSI	19		15
CS	24	CS0	13
RST	5		11
DC	3		12
LED	18	need check	18
VCC	1	3.3v
GND	6	GND

Seriale (via usb gadget)

una volta flashato e acceso, il device esporra' una seriale via usb gadget, ES:

/dev/ttyACM0

per collegarsi:

screen /dev/ttyACM0 115200 8n1

Tasti

• Joystick U/D/L/R + Push
• Sensore di movimento
• Sensore di luce

uC supervisore

• STM32L041x6
• 11 input
• SPI verso schermo
• I2C verso scheda CPU

carica batteria

• candidati: CN3065, STC4054, MCP73811, MCP73831/2

step-up

• L6920
• AP1609

altre board

SAMA5D2x

CPU a basso consumo, possibilita di low power mode, uscita per TFT

• https://groboards.com/giant-board/
• https://www.acmesystems.it/roadrunner

Software

Display

fbtft_device (kernel <5.4)

in /boot/armbianEnv.txt:

overlays=usbhost2 usbhost3 spi-spidev
param_spidev_spi_bus=1

in /etc/modprobe.d/fbtft.conf:

options fbtft_device custom name=fb_ili9341 gpios=dc:12,reset:11,led:18 speed=1600000 fps=5 busnum=1 bgr=1 rotate=90

X

FRAMEBUFFER=/dev/fb0 startx

trovare il proprio device /dev/fbX

verificare che device ci sono sotto /dev/fb*:

root@orangepizeroplus2:~# ll /dev/fb*
crw-rw---- 1 root video     29, 0 Feb  8 01:15 /dev/fb0
crw-rw---- 1 root video     29, 1 Feb  8 01:15 /dev/fb1

quindi lanciare il modprobe:

modprobe fbtft_device custom name=fb_ili9341 gpios=dc:12,reset:11,led:18 speed=1600000 fps=5 busnum=1 bgr=1 rotate=90

e verificare il nuovo device:

root@orangepizeroplus2:~# ll /dev/fb*
crw-rw---- 1 root video     29, 0 Feb  8 01:15 /dev/fb0
crw-rw---- 1 root video     29, 1 Feb  8 01:15 /dev/fb1
-rw-r--r-- 1 root root  101056512 Feb  8 01:50 /dev/fb2

nel nostro caso e' il

/dev/fb2

cambiare font e dimensione del display

source: https://learn.watterott.com/hats/rpi-display/faq/

eseguire con permessi di super-user:

dpkg-reconfigure console-setup

quindi seguire i passaggi:

• Encoding to use on the console: <UTF-8>
• Character set to support: <Guess optimal character set>
• Font for the console: Terminus (default is VGA)
• Font size: 6x12 (framebuffer only)

e riavviare

test del display

una volta che a mano viene lanciato

modprobe fbtft_device custom name=fb_ili9341 gpios=dc:12,reset:11,led:18 speed=1600000 fps=5 busnum=1 bgr=1 rotate=90

il display dovrebbe diventare bianco e poi per righe di pixel, nero. quindi e' possibile lanciare:

cat /dev/urandom > /dev/fb2

che creera' una schermata con pixel di diversi colori (random)

console output su lcd dal boot

source: https://kaspars.net/blog/spi-display-orange-pi-zero

in /etc/modules-load.d/fbtft.conf:

fbtft_device

in /etc/modprobe.d/fbtft.conf:

options fbtft_device custom name=fb_ili9341 gpios=dc:12,reset:11,led:18 speed=1600000 fps=5 busnum=1 bgr=1 rotate=90

in /boot/armbianEnv.txt add:

extraargs="fbcon=map:2"

dove "2" e' il tuo /dev/fbX (vedi "trovare il proprio device..")

tinydrm

https://github.com/torvalds/linux/tree/master/drivers/gpu/drm/tiny

aptitude install linux-headers-next-sunxi

/dts-v1/;
/plugin/;
 
/ {
    compatible = "allwinner,sun8i-h3";
 
    fragment@0 {
        target-path = "/aliases";
        __overlay__ {
            spi1 = "/soc/spi@01c69000";
        };
    };
 
    fragment@1 {
        target = <&spi1>;
        __overlay__ {
            status = "okay";
 
            spidev {
                compatible = "spidev";
                reg = <0>;
                spi-max-frequency = <50000000>;
            };
        };
    };
};

armbian-add-overlay myili9431.dts

GUI

Applicazioni

• alpine
• newsbeuter
• profanity

Risparmio energetico

Idle

• https://forum.armbian.com/topic/1614-running-h3-boards-with-minimal-consumption/

ARISC on board

• https://linux-sunxi.org/AR100
• https://forum.armbian.com/topic/6019-openrisc-core-ar100-for-the-real-time-tasks/
• https://github.com/skristiansson/ar100-info

Sleep

• https://h3droid.com/