AnonymousPi

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  1. Hello! I bought an Orange Pi PC about two years ago which is still working perfectly to this day (very happy with it), but I am curious to know what would be considered the 'best' Single Board Computer at this time point time, which would be around the same price range ($15 USD). 'Best' being defined as having a decent processor, and good software support - which the Orange Pi PC eventually did. I'm tempted to just buy another one of these for another project, but interested to know. Again, the main factor is price - $15 USD or less would be ideal.
  2. AnonymousPi

    Meltdown and Spectre

    I guess it's up to Igor to decide this. I think even 10 boards is too many. Perhaps the Top 5 get priority. I suspect this would mean most of the Orange PI derivatives would be the focus - but one only needs to look at the forums to see they already are.
  3. Hi Igor. More than happy to help out, but I am confused as to the purpose of that sun8i.conf config file. What really needs to change is the contents within the distribution '/etc/lirc/hardware.conf' so similar to how lircd.conf is contained here. Any insight in to how to do this appreciated. I am happy to test for stretch.
  4. Updated for Ubuntu Xenial issues I faced.
  5. If run the LCD screen + IC2 module off the 3.3volt rail directly, you won't need a level converter. When I tried using the 3.3volts to power the LCD the screen was really dim/dull. I didn't check to see if it worked though. If it did, then you've saved yourself a bit of hassle :-)
  6. Hi All, I recently bought a cheap 16 character, 2 row LCD display from aliexpress.com for use with my Orange Pi PC. I got it to work without too much pain, but I thought I would document it here for the benefit of others. Some good instructions are already available on the internet, but there are some tweaks required for the Orange PI. Armbian I believe already has the I2C module compiled into the kernel directly. So no Linux Kernal insmod work required, unlike what many Raspberry PI guides seem to imply. Step 1) Buy the things you will need. 1. You obviously need a 1602 LCD module which also comes with the the I2C converter. You can buy a 1602 LCD and wire it directly to the 16 GPIO pins required if you want, but that isn't the point of this guide. 2. You will need a level shifter. The LCD display works on +5volts. The OrangePI/H3 GPIO pins are 3.3 volts. I have seen guides stating that you don't need a level shifter, but I'm sure you're slowly frying some transistors in your OrangePI over time. 3. You will need a bunch of jumper cables etc. Like these, female to female only required really. Step 2) Wire things up accordingly. Thanks to this fantastic guide, the instructions on wiring the Orange PI to the Level Shifter LV ('low voltage') pins, and then the Level Shifter HV ('high voltage') pins to the 1602 I2C module is pretty clear: http://www.raspberrypi-spy.co.uk/2015/05/using-an-i2c-enabled-lcd-screen-with-the-raspberry-pi/ Level Shifter OrangePI 1602 I2C Backpack LV 3.3V (pin 1) – LV1 SDA (pin 3) – LV2 SCL (pin 5) – GND GND (pin 6) GND HV 5V (pin 2) VCC HV1 SDA HV2 SCL Note, you connect the 1602 I2C module/backpack directly to the 5Volt Pin on the PI (Pin 2 or 4) and Ground (Pin 6) respectively. Note: For some strange reason the level shifter works if you don't connect the ground pins to either side of it (i.e. Use the LV, LV1, LV2, HV, HV1 and HV2 pins only). No idea why - electrical engineering degree required I think. If all works well, you should see the LCD module light-up with the top row being a bunch of white bars (you might need to check the contrast setting of the module as well). White bars = uninitialised LCD screen. Step 3) Install the required packages int Armbian Reference: https://www.abelectronics.co.uk/kb/article/1061/i2c--smbus-and-armbian-linux sudo apt-get install -y python-smbus i2c-tools Step 4) Check to see what the address of the LCD Screen is: Reference: http://www.raspberrypi-spy.co.uk/2014/11/enabling-the-i2c-interface-on-the-raspberry-pi/ user@orangepipc:~/Downloads/i2c$ sudo i2cdetect -y 0 [sudo] password for userpi: 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3f 40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- user@orangepipc:~/Downloads/i2c$ sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- Looks like it's 0x3f as the address on I2C bus 0 (which is apparently right according to the aliexpress buyer feedback comments) Step 5) Download Example Script Reference: http://www.raspberrypi-spy.co.uk/2015/05/using-an-i2c-enabled-lcd-screen-with-the-raspberry-pi/ The example script will allow you to send text to the screen via I2C. It is very similar to my scripts for the normal 16×2 screen. To download the script directly to your Pi you can use : wget https://bitbucket.org/MattHawkinsUK/rpispy-misc/raw/master/python/lcd_i2c.py Step 6) Adjust the Sample Script I need to adjust the script to reference a 1602 LCD device with address 0x3f, on Orange Pi PC I2C Bus, 0. The script as it is references a device of 0x27 on Bus 1 - it won't work. You might have a LCD device of address 0x27 (you'll know from the previous step), but it seems many of the cheap LCD modules from aliexpress are 0x3f for some reason. Adjusted script below: #!/usr/bin/python #-------------------------------------- # ___ ___ _ ____ # / _ \/ _ \(_) __/__ __ __ # / , _/ ___/ /\ \/ _ \/ // / # /_/|_/_/ /_/___/ .__/\_, / # /_/ /___/ # # lcd_i2c.py # LCD test script using I2C backpack. # Supports 16x2 and 20x4 screens. # # Author : Matt Hawkins # Date : 20/09/2015 # # http://www.raspberrypi-spy.co.uk/ # # Copyright 2015 Matt Hawkins # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # #-------------------------------------- import smbus import time # Define some device parameters I2C_ADDR = 0x3f # I2C device address LCD_WIDTH = 16 # Maximum characters per line # Define some device constants LCD_CHR = 1 # Mode - Sending data LCD_CMD = 0 # Mode - Sending command LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line LCD_BACKLIGHT = 0x08 # On #LCD_BACKLIGHT = 0x00 # Off ENABLE = 0b00000100 # Enable bit # Timing constants E_PULSE = 0.0005 E_DELAY = 0.0005 #Open I2C interface bus = smbus.SMBus(0) # Rev 1 Pi uses 0 (and Orange PI PC, for pins 3 and 5) #bus = smbus.SMBus(1) # Rev 2 Pi uses 1 def lcd_init(): # Initialise display lcd_byte(0x33,LCD_CMD) # 110011 Initialise lcd_byte(0x32,LCD_CMD) # 110010 Initialise lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size lcd_byte(0x01,LCD_CMD) # 000001 Clear display time.sleep(E_DELAY) def lcd_byte(bits, mode): # Send byte to data pins # bits = the data # mode = 1 for data # 0 for command bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT bits_low = mode | ((bits<<4) & 0xF0) | LCD_BACKLIGHT # High bits bus.write_byte(I2C_ADDR, bits_high) lcd_toggle_enable(bits_high) # Low bits bus.write_byte(I2C_ADDR, bits_low) lcd_toggle_enable(bits_low) def lcd_toggle_enable(bits): # Toggle enable time.sleep(E_DELAY) bus.write_byte(I2C_ADDR, (bits | ENABLE)) time.sleep(E_PULSE) bus.write_byte(I2C_ADDR,(bits & ~ENABLE)) time.sleep(E_DELAY) def lcd_string(message,line): # Send string to display message = message.ljust(LCD_WIDTH," ") lcd_byte(line, LCD_CMD) for i in range(LCD_WIDTH): lcd_byte(ord(message[i]),LCD_CHR) def main(): # Main program block # Initialise display lcd_init() while True: # Send some test lcd_string("RPiSpy <",LCD_LINE_1) lcd_string("I2C LCD <",LCD_LINE_2) time.sleep(3) # Send some more text lcd_string("> RPiSpy",LCD_LINE_1) lcd_string("> I2C LCD",LCD_LINE_2) time.sleep(3) if __name__ == '__main__': try: main() except KeyboardInterrupt: pass finally: lcd_byte(0x01, LCD_CMD) Step 7) ADD YOUR USER ACCOUNT TO 'i2c' GROUP This is a really useful thing to do, otherwise you'll need to run the python script as ROOT (via. sudo etc.) every time. No good if you want to write a python script that runs using your normal user account and sends messages over I2C to the LCD. Reference: https://www.abelectronics.co.uk/kb/article/1061/i2c--smbus-and-armbian-linux sudo adduser <YOUR_USER_ID> i2c eg: sudo adduser johnsmith i2c Step 8) Run your script! python lcd_i2c.py Amazing! Please note: You can probably use a more advanced library to output data to the LCD, but for now, it probably isn't required: https://gist.github.com/DenisFromHR (you will need to adjust the code in 'RPi_I2C_driver.py' to refer to port=0, not port=1 to get this to work. Also change the address of the LCD device if required) http://www.circuitbasics.com/raspberry-pi-i2c-lcd-set-up-and-programming/ What a level shifter looks like:
  7. AnonymousPi

    MPV video playback - not showing controls

    I don't know enough about the XOrg to /dev/disp chain, but I'm willing to put my c coding skills to test! However, is there any hardware limitation which would make this not possible? My only query is trying to pump the resulting VPU generated bitmap to the X framebuffer (correct me if I have no idea what I'm talking about) would probably have an adverse performance hit.
  8. Hi All, Does anybody have a solution to the issue with playing video in Armbian that the MPV on-screen controls (i.e. Pause, Stop and the Timeline) isn't visible in the bottom middle of the video frame? Is there any way to get this back? Does it require a re-compile of mpv, or is this behaviour a result of the All winner undocumented blob based hardware acceleration, dumping pixels straight onto the frame buffer, with little one can do about it. Has anybody compiled mpv from scratch and not had this issue? I notice that when playing video, the video paints over the top of everything - including the mouse pointer. Photo attached with red boxes to highlight what I mean.
  9. Well. Looks like I have wasted your time tkaiser. Sorry! It seems my ISP provided an Over the Air update of my Router/Modem exactly the same time I upgraded to a 32GB Class 10 SD card. This OTA update looks to have fixed the Ethernet issue with the Orange PI PC. I can't seem the replicate the problem anymore, even with the old SD Card or older version of Armbian. If only I had another switch from the get go, I could have confirmed it was actually an issue with my networking hardware not the PI PC!
  10. The Class 4 SD Card is fine from a storage perspective, but maybe it's the reduced bus speed that was killing other peripherals on the H3. Warning: Only 7439 of 7440 MByte tested. Test finished without errors. You can now delete the test files *.h2w or verify them again. Writing speed: 7.07 MByte/s Reading speed: 20.3 MByte/s H2testw v1.4 http://www.pcper.com/reviews/Editorial/SD-Card-Speed-Classes-Grades-Modes-and-File-Systems-Explained
  11. I think I have figured it out and it again goes to show what a black box these Chinese H3 devices are. I have been using a 8GB Class 4 SD Card with this device without any issues, other than with Ethernet performance being dismal when using full duplex either at 100mbps or 10mbps port speed. It seems this has been resolved with the use of a Transcend 32GB Class 10 SD Card!?? Although I am also using Armbian 5.20 now, instead of 5.14 on the Class 4 SD Card - so maybe that was it. Who knows how these devices work. Maybe the bus frequency is reduced to match the frequency of the SD Card, which inadvertently kills the Ethernet? Maybe the Armbian 5.20 fixed something. Another one of life's mysteries. Edit: Absolutely nothing to do with the SD Card. Looking like my ISP provided an Over the Air update of my Router/Modem which fixed this bizarre Ethernet issue with the Orange PI PC. I can't seem the replicate the problem, even with the old SD Card or older version of Armbian.
  12. Wouldn't have the slightest clue. Your first battle will be seeing if such a piece of hardware is even supported by Linux. If not, no amount of ALSA configuration is going to help. In any case, the configuration above is for audio output only.
  13. Can you provide a link to the USB Bluetooth adaptor that you bought (aliexpress etc)? I wish to buy one for my Orange PI PC.
  14. Perform 'Step 1' per my guide above, then copy-paste the /etc/asound.conf file to be: pcm.!default { type plug slave.pcm "dmixer" } pcm.dmixer { type dmix ipc_key 1024 slave { pcm "hw:0,0" # "hw:1,0" means HDMI change to "hw:0,0" for analog lineout jack output period_time 0 period_size 1024 buffer_size 4096 rate 44100 } bindings { 0 0 1 1 } } ctl.dmixer { type hw card 0 } ctl.!default { type hw card 0 } The hint on what to do was in my comment within the suggested asound.conf in my original post: # "hw:1,0" means HDMI change to "hw:0,0" for analog lineout jack output
  15. Hi All, After I accomplished my IR Red Key Rick Rolling experiment the other day with much success, and from general end-luser use with Armbian, there were two things which irritated me, which are namely due to the default ALSA configuration that comes with stock Debian and that Armbian inherits. These were: Update: 11 September 2017. This guide will not work for newer Armbiam (Debian) installations which comes with Pulseaudio by default. If you really want what this tutorial provides, you will need to uninstall pulseaudio first: sudo apt-get remove pulseaudio 1) You can't have simultaneous applications using an Audio device. So, how about if I want to stream Internet Radio with 'Radio Tray' but also get system alert sounds, or anything else? Out of luck, you'll get (for example): [ao/alsa] Playback open error: Device or resource busy 2) I want to actually have audio going out of the 3.5mm jack (don't really care about video out), better still if it's the same/simultaneous to what is going out via. HDMI. That means if I have a HDMI TV connected then I can get the sound from the TV, if I don't, then I can just use the 3.5mm jack (i.e. If I'm using my Pi to play Rick Astley headless/without a TV). No need to keep editing /etc/asound.conf every time. Solution? Step 1) Fix the mute on the analog Line-Out in alsamixer (for a start) There's a lot of noise out there about people not being able to get any sound our of the analog Line-Out jack even when having changed /etc/asound.conf. The reason for this is likely due to a mute by default on the analog audio line-out (i.e. the 3.5mm headphone jack) in alsa that you would unlikely to be aware of. I only found this out thanks to a comment here, otherwise I would have thrown by Pi PC out the window today. So to fix, you need to type in the console: sudo alsamixer Then F6 select the 'audiocodec', then tap the right arrow key to select the 'Audio lineout [Off]' item. Press 'm' and you'll get the green 'OO', which means it's now active. Exit alsamixer, and when you're back at the console type: sudo alsactl store 0 ... to store you mixer settings. For your information, the mixer settings are stored to the file: /var/lib/alsa/asound.state ... and if you do a diff of this file after having made the changes in alsamixer, this is what is changed in the alsa asound.state file: control.9 { control.9 { iface MIXER iface MIXER name 'Audio lineout' name 'Audio lineout' value false | value true comment { comment { access 'read write' access 'read write' type BOOLEAN type BOOLEAN count 1 count 1 } } } } Step 2) Change the /etc/asound.conf file As you might or might not be aware, the default /etc/asound.conf file looks something like this: pcm.!default { type hw card 1 } ctl.!default { type hw card 1 } All it is configured to do is give applications direct access to the hardware audio device, and pump the sound either out to the analogue line-out ('card 0') or via HDMI ('card 1'). Pretty basic, but does the job. However, what I wanted was two things: Software mixing before the resulting PCM/Sound is sent to the hardware audio device - This enables me to listen to Internet Radio and Youtube at the same time... Simultaneous Output to both HDMI and analog line-out. If you want only (1) above, and only via HDMI, then the /etc/asound.conf file is this: pcm.!default { type plug slave.pcm "dmixer" } pcm.dmixer { type dmix ipc_key 1024 slave { pcm "hw:1,0" # "hw:1,0" means HDMI change to "hw:0,0" for analog lineout jack output period_time 0 period_size 1024 buffer_size 4096 rate 44100 } bindings { 0 0 1 1 } } ctl.dmixer { type hw card 0 } ctl.!default { type hw card 0 } If you want (1) and (2) (which of course you do), then the /etc/asound.conf file is this: # Thanks to: http://alsa.opensrc.org/Asoundrc#Dupe_output_to_multiple_cards # https://sourceforge.net/p/alsa/mailman/message/33476395/ # Check that a MUTE doesn't exist on the Audio Line Out for Orange PI PC # or you'll get no sound other than via HDMI pcm.!default { type plug slave.pcm "duplicate" } ctl.!default { type hw card 0 } # Create the Software Mixer for HDMI and then link to hardware pcm.hdmi-dmixer { type dmix ipc_key 1024 slave { #pcm "hw:0,0" # pcm "duplicate" pcm "hdmi-hw" # pcm "analog-hw" period_time 0 period_size 1024 buffer_size 4096 rate 44100 } bindings { 0 0 1 1 } } ctl.hdmi-dmixer { type hw card 0 } # Create the Software Mixer for Analogue Out and then link to hardware pcm.analog-dmixer { type dmix ipc_key 2048 slave { #pcm "hw:0,0" # pcm "duplicate" # pcm "hdmi-hw" pcm "analog-hw" period_time 0 period_size 1024 buffer_size 4096 rate 44100 } bindings { 0 0 1 1 } } ctl.analog-dmixer { type hw card 0 } # Route the audio requests to both hardware devices via the mixer. # For some reason we can't have one mixer and then route to two hardware # devices (would be more efficient). pcm.duplicate { type route slave.pcm { type multi slaves { a { pcm "analog-dmixer" channels 2 } h { pcm "hdmi-dmixer" channels 2 } } bindings [ { slave a channel 0 } { slave a channel 1 } { slave h channel 0 } { slave h channel 1 } ] } ttable [ [ 1 0 1 0 ] [ 0 1 0 1 ] ] } ctl.duplicate { type hw; card 0; } # Physical Output Device Mappings - Analogue and HDMI for Orange PI PC pcm.analog-hw { type hw card 0 } pcm.hdmi-hw { type hw card 1 } There you have it. The only downside is that CPU usage for playing music will increase a bit as ALSA will essentially route inputs from applications to two Software Mixers, which are connected to the HDMI and Analog Line-Out hardware devices separately. For some reason you can't have a single Software Mixer route to two hardware devices (or I couldn't get it to work), but whatever. We're talking 20% CPU usage vs. 10% on one core, to play music.