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Linux distribucijų niuansai

Stabili palaikoma Armbian distribucijos versija Armbian_5.75_Orangepilite_Debian_stretch_next_4.19.20. Kitos distribucijos ir/ar versijos su naujausiais 5.x arba 3.x branduoliais veikia blogai ir nepatikimai. Dažnai pasitaikančios problemos kyla su wifi ir microsd kortelių tvarkyklėmis. Bet kokiu atveju patartina naudoti stabilesnį usb wifi tinklo adapterį. Kaip įdiegti išorinį wifi usb adapterį aprašyta čia.

/etc/apt/sources.list

deb http://mirror.applebred.net/debian stretch main stretch-utils contrib non-free
deb http://mirror.applebred.net/debian stretch-updates main contrib non-free
deb http://mirror.applebred.net/debian stretch-backports main contrib non-free

Pins

Pins with names (Rasp compatible)

Ledu palaikymo ijungimas armbian stretch distribucijoje

/boot/armbianEnv.txt

overlay_prefix=sun8i-h3
overlays=spi-spidev
param_spidev_spi_bus=0

max7219 libo idiegimas

apt-get install python-setuptools build-essential python-dev zlib1g-dev libjpeg62-turbo-dev 
git clone https://github.com/rm-hull/luma.led_matrix.git
python setup.py build
python setup.py install

Keletas scriptu

/usr/local/bin/piesti_lcd

#!/usr/bin/env python
# settings
leds=8 # ledu blocku kiekis
orientation=-90 # orientacija
rotate=2 # koks rotate


from luma.led_matrix.device import max7219
from luma.core.interface.serial import spi, noop
from luma.core.render import canvas
from luma.core.virtual import viewport
from luma.core.legacy import text, show_message
from luma.core.legacy.font import proportional, CP437_FONT, TINY_FONT, SINCLAIR_FONT, LCD_FONT

import time
import re
import argparse
from random import randrange


def goled(text,speed,repeat):
   print "Sending to led: "+text+" at speed:",speed
   serial = spi(port=0, device=0, gpio=noop())
   device = max7219(serial, cascaded=leds, block_orientation=orientation, rotate=rotate)
   for x in range(0, repeat):
      if speed>0:
        show_message(device, text, fill="white", font=proportional(CP437_FONT), scroll_delay=speed)
      else:
         show_message(device, text, fill="white", font=proportional(CP437_FONT))

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='led writer arguments',
        formatter_class=argparse.ArgumentDefaultsHelpFormatter)

    parser.add_argument('--text', '-t', type=str, default='Hello World', help='Write some text to display on the leds!')
    parser.add_argument('--speed', type=float, default=0, help='Sets text speed')
    parser.add_argument('--repeat', type=int, default=1, choices=[1, 2, 3], help='Repeat text n times')

    args = parser.parse_args()

    try:
        goled(args.text,args.speed,args.repeat)
    except KeyboardInterrupt:
        pass

/usr/local/bin/lcd_server

#!/usr/bin/env python

# settings
leds=8 # ledu blocku kiekis
orientation=-90 # orientacija
rotate=2 # koks rotate


from luma.led_matrix.device import max7219
from luma.core.interface.serial import spi, noop
from luma.core.render import canvas
from luma.core.virtual import viewport
from luma.core.legacy import text, show_message
from luma.core.legacy.font import proportional, CP437_FONT, TINY_FONT, SINCLAIR_FONT, LCD_FONT

import time
import re
import argparse
from random import randrange
import socket

def goled(data):
   speed,repeat,text = data.split("::")
   print "Sending to led: "+text+" at speed:",float(speed)
   serial = spi(port=0, device=0, gpio=noop())
   device = max7219(serial, cascaded=leds, block_orientation=orientation, rotate=rotate)
   for x in range(0, int(repeat)):
      if float(speed)>0:
        show_message(device, text, fill="white", font=proportional(CP437_FONT), scroll_delay=float(speed))
      else:
         show_message(device, text, fill="white", font=proportional(CP437_FONT))

# Create a socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Ensure that you can restart your server quickly when it terminates
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# Set the client socket's TCP "well-known port" number
well_known_port = 8881
sock.bind(('0.0.0.0', well_known_port))

# Set the number of clients waiting for connection that can be queued
sock.listen(5)

# loop waiting for connections (terminate with Ctrl-C)
try:
    while 1:
        newSocket, address = sock.accept(  )
        print "Connected from", address
        # loop serving the new client
        while 1:
            receivedData = newSocket.recv(1024)
            if not receivedData: break
            # Echo back the same data you just received
            goled(receivedData)
            newSocket.send("OK")
        newSocket.close(  )
        print "Disconnected from", address
finally:
    sock.close(  )

Crashfix naudojant įvairių gamintojų webcam'us

/etc/modprobe.d/uvcvideo.conf  

options uvcvideo nodrop=1 timeout=5000 quirks=0x80

Taip pat galima bandyti kitą metodą Raspberry usb reset.