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Operating System installation
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- Last edited 2 years ago by Bernhard Naegele
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> Main Page > Piano Expander based on Pianoteq and Odroid-N2
Contents
- 1 Ubuntu 20.04
- 2 Installation of the base-system
- 3 Rotating the Touch-Display
- 4 Enabling the On-Screen-Keyboard
- 5 Adding support for ARM 32-bit code execution
- 6 Changing FDT (Flattened Device Tree) to support second UART-Interface for MIDI
- 7 Enabling 31250 UART-Baud-Rate for Midi-Usage
- 8 Adding ADC (Audio-Input) to Odroid N2 - EXPERIMENTAL
Ubuntu 20.04
Kernel-Version
root@odroid:~# cat /proc/version Linux version 4.9.277-122 (root@builder_n2) (gcc version 7.5.0 (Ubuntu/Linaro 7.5.0-6ubuntu2) ) #1 SMP PREEMPT Mon Feb 28 14:30:14 UTC 2022
Installation of the base-system
- The installation of the operating system is pretty easy when you are using the Linux distributions which are supported by "Hardkernel".
- The new Operating-System which I have used is the ubuntu-20.04-4.9-mate-odroid-n2-20220228.img.xz . Download the Image from the Release Note of Ubuntu MATE 20.04.4 LTS (v3.3)-Web-Page or directly from here
- A guideline for installing the Image (Hardkernel) can be found here
Optional: Install and configure WiFi-Network
Optional: Install VIM as a good commandline editor
- In case that you have a valid network connection you can easily install the full-featured editor "VIM" by typing the following command on the console
sudo apt install vim -> enter the password for the root-user (default: odroid) and accept that a small amount of memory is used for the installation
Enable Auto-Login
- Known issues and Tips: ...at the end of "Release Note of Ubuntu MATE 20.04.4 LTS (v3.3)"
- To enable Auto-login, edit /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf file like this.
[SeatDefaults] greeter-session=lightdm-gtk-greeter autologin-user=odroid
Change Mate-Keymap
- Connect a Keyboard to one of the USB-Ports and a Mouse to another one.
- Goto "Menu -> Preferences -> Keyboard"
- On the Tab "Layouts" you can choose the right one
Deactivate Screensaver
- Drop down the Mate-Menu
- Go to "Preferences -> Screensaver"
- Deactivate the Check-Box "Activate screensaver when computer is idle"
- In the same window press the Button "Power-Management" select "Never" for the question "Put display to sleep when inactive for:"
Optional: Gnome-Screenshot
- If you want to make screenshots e.g. for documentation purposes you can add the tool "Gnome-Screenshot" with the following commands:
apt install gnome-screenshot
Rotating the Touch-Display
Articles regarding Display and Touch Rotation
- Odroid-Forum: How to do N2 HDMI screen rotation
- AskUbuntu: How to identify touchpad for xorg.conf modification?
- Odroid-Forum: C2 Ubuntu + VU7 rotated - touch calibration
- Odroid-Forum: Rotate Touch display 90 degree
- AskUbuntu: Rotate Touch Input with touchscreen and/or touchpad
- Odroid-Wiki:Tips for boot logo on ODROID-C4/N2
- GitHub: Script to rotate the screen and touch devices on modern Linux desktops. Great for convertible laptops., provides information about rotation options (ccw/cw/half/none)
Screen rotation
- Odroid-Forum: How to do N2 HDMI screen rotation - is working for the display, but the touch is still in original orientation
cd /usr/share/X11
mkdir xorg.conf.d
cd xorg.conf.d
vi 99-odroidn2.conf
insert the following content into this file:
# This is a minimal sample config file, which can be copied to
# /etc/X11/xorg.conf in order to make the Xorg server pick up
# and load xf86-video-fbturbo driver installed in the system.
#
# When troubleshooting, check /var/log/Xorg.0.log for the debugging
# output and error messages.
#
# Run "man fbturbo" to get additional information about the extra
# configuration options for tuning the driver.
Section "Device"
Identifier "FBTURBO"
Driver "fbturbo"
Option "fbdev" "/dev/fb0"
Option "Rotate" "CCW"
Option "SwapbuffersWait" "true"
Option "alpha_swap" "true"
EndSection
- Ausgabe von /var/log/Xorg.0.log
root@odroid:~# cat /var/log/Xorg.0.log [ 14.551] X.Org X Server 1.20.13 X Protocol Version 11, Revision 0 [ 14.551] Build Operating System: linux Ubuntu [ 14.551] Current Operating System: Linux odroid 4.9.277-122 #1 SMP PREEMPT Mon Feb 28 14:30:14 UTC 2022 aarch64 [ 14.551] Kernel command line: root=UUID=e139ce78-9841-40fe-8823-96a304a09859 rootwait rw console=ttyS0,115200n8 no_console_suspend fsck.repair=yes net.ifnames=0 elevator=noop hdmimode=custombuilt cvbsmode=576cvbs max_freq_a53=1896 max_freq_a73=1800 maxcpus=6 voutmode=dvi modeline=1280,800,75000,49472,60,1280,1344,1392,1516,800,805,812,824,1,0,1 disablehpd=false cvbscable= overscan=100 monitor_onoff=false logo=osd0,loaded hdmitx=cec3f sdrmode=auto consoleblank=0 enable_wol=0 [ 14.551] Build Date: 14 December 2021 02:14:13PM [ 14.551] xorg-server 2:1.20.13-1ubuntu1~20.04.2 (For technical support please see http://www.ubuntu.com/support) [ 14.551] Current version of pixman: 0.38.4 [ 14.551] Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. [ 14.551] Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. [ 14.551] (==) Log file: "/var/log/Xorg.0.log", Time: Sun Apr 3 10:50:27 2022 [ 14.552] (==) Using system config directory "/usr/share/X11/xorg.conf.d" [ 14.553] (==) No Layout section. Using the first Screen section. [ 14.553] (==) No screen section available. Using defaults. [ 14.553] (**) |-->Screen "Default Screen Section" (0) [ 14.553] (**) | |-->Monitor "<default monitor>" [ 14.555] (==) No device specified for screen "Default Screen Section". Using the first device section listed. [ 14.555] (**) | |-->Device "FBTURBO" [ 14.555] (==) No monitor specified for screen "Default Screen Section". Using a default monitor configuration. [ 14.555] (==) Automatically adding devices [ 14.555] (==) Automatically enabling devices [ 14.555] (==) Automatically adding GPU devices [ 14.555] (==) Automatically binding GPU devices [ 14.555] (==) Max clients allowed: 256, resource mask: 0x1fffff [ 14.561] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist. [ 14.561] Entry deleted from font path. [ 14.561] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist. [ 14.561] Entry deleted from font path. [ 14.561] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist. [ 14.561] Entry deleted from font path. [ 14.562] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist. [ 14.562] Entry deleted from font path. [ 14.562] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist. [ 14.562] Entry deleted from font path. [ 14.562] (==) FontPath set to: /usr/share/fonts/X11/misc, /usr/share/fonts/X11/Type1, built-ins [ 14.562] (==) ModulePath set to "/usr/lib/xorg/modules" [ 14.562] (II) The server relies on udev to provide the list of input devices. If no devices become available, reconfigure udev or disable AutoAddDevices. [ 14.562] (II) Loader magic: 0x555d833010 [ 14.562] (II) Module ABI versions: [ 14.562] X.Org ANSI C Emulation: 0.4 [ 14.562] X.Org Video Driver: 24.1 [ 14.562] X.Org XInput driver : 24.1 [ 14.562] X.Org Server Extension : 10.0 [ 14.563] (++) using VT number 7 [ 14.563] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration [ 14.564] (II) no primary bus or device found [ 14.564] (II) LoadModule: "glx" [ 14.569] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so [ 14.584] (II) Module glx: vendor="X.Org Foundation" [ 14.584] compiled for 1.20.13, module version = 1.0.0 [ 14.584] ABI class: X.Org Server Extension, version 10.0 [ 14.584] (II) LoadModule: "fbturbo" [ 14.585] (II) Loading /usr/lib/xorg/modules/drivers/fbturbo_drv.so [ 14.586] (II) Module fbturbo: vendor="X.Org Foundation" [ 14.587] compiled for 1.20.8, module version = 0.5.1 [ 14.587] Module class: X.Org Video Driver [ 14.587] ABI class: X.Org Video Driver, version 24.1 [ 14.587] (II) FBTURBO: driver for framebuffer: fbturbo [ 14.595] (WW) Falling back to old probe method for fbturbo [ 14.595] (II) Loading sub module "fbdevhw" [ 14.595] (II) LoadModule: "fbdevhw" [ 14.595] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so [ 14.597] (II) Module fbdevhw: vendor="X.Org Foundation" [ 14.597] compiled for 1.20.13, module version = 0.0.2 [ 14.597] ABI class: X.Org Video Driver, version 24.1 [ 14.597] (II) FBTURBO(0): using /dev/fb0 [ 14.597] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support [ 14.597] (II) FBTURBO(0): Meson OSD alpha swap enabled [ 14.597] (II) FBTURBO(0): Creating default Display subsection in Screen section "Default Screen Section" for depth/fbbpp 24/32 [ 14.597] (==) FBTURBO(0): Depth 24, (==) framebuffer bpp 32 [ 14.597] (==) FBTURBO(0): RGB weight 888 [ 14.597] (==) FBTURBO(0): Default visual is TrueColor [ 14.597] (==) FBTURBO(0): Using gamma correction (1.0, 1.0, 1.0) [ 14.597] (II) FBTURBO(0): hardware: OSD FB (video memory: 77312kB) [ 14.597] (DB) xf86MergeOutputClassOptions unsupported bus type 0 [ 14.598] (**) FBTURBO(0): Option "fbdev" "/dev/fb0" [ 14.598] (**) FBTURBO(0): Option "alpha_swap" "true" [ 14.598] (**) FBTURBO(0): Option "SwapbuffersWait" "true" [ 14.598] (II) FBTURBO(0): processor: Unknown [ 14.598] (II) FBTURBO(0): checking modes against framebuffer device... [ 14.598] (II) FBTURBO(0): checking modes against monitor... [ 14.598] (II) FBTURBO(0): Virtual size is 1280x800 (pitch 1280) [ 14.598] (**) FBTURBO(0): Built-in mode "current" [ 14.598] (==) FBTURBO(0): DPI set to (96, 96) [ 14.598] (II) Loading sub module "fb" [ 14.598] (II) LoadModule: "fb" [ 14.598] (II) Loading /usr/lib/xorg/modules/libfb.so [ 14.600] (II) Module fb: vendor="X.Org Foundation" [ 14.600] compiled for 1.20.13, module version = 1.0.0 [ 14.600] ABI class: X.Org ANSI C Emulation, version 0.4 [ 14.636] (II) FBTURBO(0): using backing store heuristics [ 14.642] (II) FBTURBO(0): enabled VFP/NEON optimizations [ 14.642] (==) FBTURBO(0): Backing store enabled [ 14.644] (==) FBTURBO(0): DPMS enabled [ 14.644] (II) FBTURBO(0): no 3D acceleration because the driver has been compiled without libUMP [ 14.644] (II) FBTURBO(0): if this is wrong and needs to be fixed, please check ./configure log [ 14.644] (II) Initializing extension Generic Event Extension [ 14.645] (II) Initializing extension SHAPE [ 14.645] (II) Initializing extension MIT-SHM [ 14.645] (II) Initializing extension XInputExtension [ 14.646] (II) Initializing extension XTEST [ 14.646] (II) Initializing extension BIG-REQUESTS [ 14.646] (II) Initializing extension SYNC [ 14.647] (II) Initializing extension XKEYBOARD [ 14.647] (II) Initializing extension XC-MISC [ 14.647] (II) Initializing extension SECURITY [ 14.647] (II) Initializing extension XFIXES [ 14.647] (II) Initializing extension RENDER [ 14.648] (II) Initializing extension RANDR [ 14.648] (II) Initializing extension COMPOSITE [ 14.649] (II) Initializing extension DAMAGE [ 14.649] (II) Initializing extension MIT-SCREEN-SAVER [ 14.649] (II) Initializing extension DOUBLE-BUFFER [ 14.649] (II) Initializing extension RECORD [ 14.650] (II) Initializing extension DPMS [ 14.650] (II) Initializing extension Present [ 14.650] (II) Initializing extension DRI3 [ 14.650] (II) Initializing extension X-Resource [ 14.650] (II) Initializing extension XVideo [ 14.650] (II) Initializing extension XVideo-MotionCompensation [ 14.650] (II) Initializing extension SELinux [ 14.650] (II) SELinux: Disabled on system [ 14.650] (II) Initializing extension GLX [ 14.651] (II) AIGLX: Screen 0 is not DRI2 capable [ 14.986] (II) IGLX: Loaded and initialized swrast [ 14.986] (II) GLX: Initialized DRISWRAST GL provider for screen 0 [ 14.986] (II) Initializing extension XFree86-VidModeExtension [ 14.986] (II) Initializing extension XFree86-DGA [ 14.986] (II) Initializing extension XFree86-DRI [ 14.987] (II) Initializing extension DRI2 [ 15.055] (II) config/udev: Adding input device WaveShare WS170120 (/dev/input/event5) [ 15.055] (**) WaveShare WS170120: Applying InputClass "libinput touchscreen catchall" [ 15.055] (II) LoadModule: "libinput" [ 15.055] (II) Loading /usr/lib/xorg/modules/input/libinput_drv.so [ 15.061] (II) Module libinput: vendor="X.Org Foundation" [ 15.061] compiled for 1.20.4, module version = 0.29.0 [ 15.061] Module class: X.Org XInput Driver [ 15.061] ABI class: X.Org XInput driver, version 24.1 [ 15.061] (II) Using input driver 'libinput' for 'WaveShare WS170120' [ 15.061] (**) WaveShare WS170120: always reports core events [ 15.061] (**) Option "Device" "/dev/input/event5" [ 15.061] (**) Option "_source" "server/udev" [ 15.126] (II) event5 - WaveShare WS170120: is tagged by udev as: Touchscreen [ 15.126] (II) event5 - WaveShare WS170120: device is a touch device [ 15.127] (II) event5 - WaveShare WS170120: device removed [ 15.176] (**) Option "config_info" "udev:/sys/devices/platform/ff500000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.1/1-1.1:1.0/0003:0EEF:0005.0001/input/input5/event5" [ 15.176] (II) XINPUT: Adding extended input device "WaveShare WS170120" (type: TOUCHSCREEN, id 6) [ 15.176] (**) Option "AccelerationScheme" "none" [ 15.176] (**) WaveShare WS170120: (accel) selected scheme none/0 [ 15.176] (**) WaveShare WS170120: (accel) acceleration factor: 2.000 [ 15.176] (**) WaveShare WS170120: (accel) acceleration threshold: 4 [ 15.239] (II) event5 - WaveShare WS170120: is tagged by udev as: Touchscreen [ 15.239] (II) event5 - WaveShare WS170120: device is a touch device [ 15.241] (II) config/udev: Adding input device WaveShare WS170120 (/dev/input/mouse2) [ 15.241] (II) No input driver specified, ignoring this device. [ 15.241] (II) This device may have been added with another device file. [ 15.242] (II) config/udev: Adding input device Logitech M570 (/dev/input/event3) [ 15.242] (**) Logitech M570: Applying InputClass "libinput pointer catchall" [ 15.242] (II) Using input driver 'libinput' for 'Logitech M570' [ 15.242] (**) Logitech M570: always reports core events [ 15.242] (**) Option "Device" "/dev/input/event3" [ 15.242] (**) Option "_source" "server/udev" [ 15.245] (II) event3 - Logitech M570: is tagged by udev as: Mouse Trackball [ 15.245] (II) event3 - Logitech M570: device set to 540 DPI [ 15.245] (II) event3 - Logitech M570: device is a pointer [ 15.245] (II) event3 - Logitech M570: device removed [ 15.288] (**) Option "config_info" "udev:/sys/devices/platform/ff500000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.2/1-1.2:1.2/0003:046D:C52B.0004/0003:046D:1028.0007/input/input3/event3" [ 15.288] (II) XINPUT: Adding extended input device "Logitech M570" (type: MOUSE, id 7) [ 15.288] (**) Option "AccelerationScheme" "none" [ 15.288] (**) Logitech M570: (accel) selected scheme none/0 [ 15.288] (**) Logitech M570: (accel) acceleration factor: 2.000 [ 15.288] (**) Logitech M570: (accel) acceleration threshold: 4 [ 15.291] (II) event3 - Logitech M570: is tagged by udev as: Mouse Trackball [ 15.291] (II) event3 - Logitech M570: device set to 540 DPI [ 15.291] (II) event3 - Logitech M570: device is a pointer [ 15.292] (II) config/udev: Adding input device Logitech M570 (/dev/input/mouse0) [ 15.293] (II) No input driver specified, ignoring this device. [ 15.293] (II) This device may have been added with another device file. [ 15.294] (II) config/udev: Adding input device Logitech M570 (/dev/input/event4) [ 15.294] (**) Logitech M570: Applying InputClass "libinput pointer catchall" [ 15.294] (II) Using input driver 'libinput' for 'Logitech M570' [ 15.294] (**) Logitech M570: always reports core events [ 15.294] (**) Option "Device" "/dev/input/event4" [ 15.294] (**) Option "_source" "server/udev" [ 15.297] (II) event4 - Logitech M570: is tagged by udev as: Mouse Trackball [ 15.297] (II) event4 - Logitech M570: device set to 540 DPI [ 15.297] (II) event4 - Logitech M570: device is a pointer [ 15.297] (II) event4 - Logitech M570: device removed [ 15.340] (**) Option "config_info" "udev:/sys/devices/platform/ff500000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.2/1-1.2:1.2/0003:046D:C52B.0004/0003:046D:1028.0008/input/input4/event4" [ 15.340] (II) XINPUT: Adding extended input device "Logitech M570" (type: MOUSE, id 8) [ 15.340] (**) Option "AccelerationScheme" "none" [ 15.340] (**) Logitech M570: (accel) selected scheme none/0 [ 15.340] (**) Logitech M570: (accel) acceleration factor: 2.000 [ 15.340] (**) Logitech M570: (accel) acceleration threshold: 4 [ 15.342] (II) event4 - Logitech M570: is tagged by udev as: Mouse Trackball [ 15.342] (II) event4 - Logitech M570: device set to 540 DPI [ 15.342] (II) event4 - Logitech M570: device is a pointer [ 15.344] (II) config/udev: Adding input device Logitech M570 (/dev/input/mouse1) [ 15.344] (II) No input driver specified, ignoring this device. [ 15.344] (II) This device may have been added with another device file. [ 15.345] (II) config/udev: Adding input device HID 046a:002b (/dev/input/event1) [ 15.345] (**) HID 046a:002b: Applying InputClass "libinput keyboard catchall" [ 15.345] (II) Using input driver 'libinput' for 'HID 046a:002b' [ 15.345] (**) HID 046a:002b: always reports core events [ 15.345] (**) Option "Device" "/dev/input/event1" [ 15.345] (**) Option "_source" "server/udev" [ 15.348] (II) event1 - HID 046a:002b: is tagged by udev as: Keyboard [ 15.348] (II) event1 - HID 046a:002b: device is a keyboard [ 15.348] (II) event1 - HID 046a:002b: device removed [ 15.380] (**) Option "config_info" "udev:/sys/devices/platform/ff500000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.3/1-1.3:1.0/0003:046A:002B.0005/input/input1/event1" [ 15.380] (II) XINPUT: Adding extended input device "HID 046a:002b" (type: KEYBOARD, id 9) [ 15.380] (**) Option "xkb_model" "pc105" [ 15.380] (**) Option "xkb_layout" "us" [ 15.385] (II) event1 - HID 046a:002b: is tagged by udev as: Keyboard [ 15.385] (II) event1 - HID 046a:002b: device is a keyboard [ 15.389] (II) config/udev: Adding input device HID 046a:002b (/dev/input/event2) [ 15.389] (**) HID 046a:002b: Applying InputClass "libinput keyboard catchall" [ 15.389] (II) Using input driver 'libinput' for 'HID 046a:002b' [ 15.389] (**) HID 046a:002b: always reports core events [ 15.389] (**) Option "Device" "/dev/input/event2" [ 15.389] (**) Option "_source" "server/udev" [ 15.394] (II) event2 - HID 046a:002b: is tagged by udev as: Keyboard [ 15.394] (II) event2 - HID 046a:002b: device is a keyboard [ 15.395] (II) event2 - HID 046a:002b: device removed [ 15.412] (II) libinput: HID 046a:002b: needs a virtual subdevice [ 15.412] (**) Option "config_info" "udev:/sys/devices/platform/ff500000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.3/1-1.3:1.1/0003:046A:002B.0006/input/input2/event2" [ 15.412] (II) XINPUT: Adding extended input device "HID 046a:002b" (type: MOUSE, id 10) [ 15.412] (**) Option "AccelerationScheme" "none" [ 15.412] (**) HID 046a:002b: (accel) selected scheme none/0 [ 15.412] (**) HID 046a:002b: (accel) acceleration factor: 2.000 [ 15.412] (**) HID 046a:002b: (accel) acceleration threshold: 4 [ 15.417] (II) event2 - HID 046a:002b: is tagged by udev as: Keyboard [ 15.417] (II) event2 - HID 046a:002b: device is a keyboard [ 15.419] (II) config/udev: Adding input device cec_input (/dev/input/event0) [ 15.419] (**) cec_input: Applying InputClass "libinput keyboard catchall" [ 15.419] (II) Using input driver 'libinput' for 'cec_input' [ 15.419] (**) cec_input: always reports core events [ 15.419] (**) Option "Device" "/dev/input/event0" [ 15.419] (**) Option "_source" "server/udev" [ 15.421] (II) event0 - cec_input: is tagged by udev as: Keyboard [ 15.421] (II) event0 - cec_input: device is a keyboard [ 15.421] (II) event0 - cec_input: device removed [ 15.440] (**) Option "config_info" "udev:/sys/devices/virtual/input/input0/event0" [ 15.440] (II) XINPUT: Adding extended input device "cec_input" (type: KEYBOARD, id 11) [ 15.440] (**) Option "xkb_model" "pc105" [ 15.440] (**) Option "xkb_layout" "us" [ 15.442] (II) event0 - cec_input: is tagged by udev as: Keyboard [ 15.442] (II) event0 - cec_input: device is a keyboard [ 15.466] (**) HID 046a:002b: Applying InputClass "libinput keyboard catchall" [ 15.467] (II) Using input driver 'libinput' for 'HID 046a:002b' [ 15.467] (**) HID 046a:002b: always reports core events [ 15.467] (**) Option "Device" "/dev/input/event2" [ 15.467] (**) Option "_source" "_driver/libinput" [ 15.467] (II) libinput: HID 046a:002b: is a virtual subdevice [ 15.467] (**) Option "config_info" "udev:/sys/devices/platform/ff500000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.3/1-1.3:1.1/0003:046A:002B.0006/input/input2/event2" [ 15.467] (II) XINPUT: Adding extended input device "HID 046a:002b" (type: KEYBOARD, id 12) [ 15.467] (**) Option "xkb_model" "pc105" [ 15.467] (**) Option "xkb_layout" "us" root@odroid:~#
Touch rotation
Depending on how you want to rotate the display, you must enter the following values : 90°-Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1" 180°-Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1" 270°-Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1"
Enabling the On-Screen-Keyboard
- In applications, where you don't want to use an external keyboard you have the possibility to use an "On-Screen-Keyboard" which could be controlled via the Touch-Screen.
Switch-On the On-Screen-Keyboard on Ubuntu-Mate
- On Ubuntu-Mate the On-Screen-Keyboard is already installed. You can find it in the ‘Universal Access’ menu. In this menu you find the application "Onboard" -> a click on this menu-point activates the On-Screen-Keyboard.
Adding support for ARM 32-bit code execution
- Pianoteq 6 for ARM architecture is unfortunatly only available as 32-bit code - by meaning we have to install first the 32-bit support on the Ubuntu-Mate distribution supplied by "Hardkernel".
- Here is an article about how much the 64-bit CPUs would benefit from the additional AARCH64 instructions: 64-bit ARM (Aarch64) Instructions Boost Performance by 15 to 30% Compared to 32-bit ARM (Aarch32) Instructions.
- Odroid-Forum article: 32 Bit executables in AARCH64 system
odroid64:$ sudo dpkg --add-architecture armhf odroid64:$ sudo apt-get update apt install libc6:armhf apt install libx11-6:armhf apt install libfreetype6:armhf apt install libxext6:armhf apt install libasound2:armhf
Changing FDT (Flattened Device Tree) to support second UART-Interface for MIDI
- Article on the Odroid-Wiki: UART Interface on the 40 Pin Header
Installation of the device tree compiler (dtc)
$ apt install device-tree-compiler
check if second UART is allready enabled
fdtget /media/boot/meson64_odroidn2.dtb /serial@ffd24000 status # returns disabled
- "disabled" means that the second native uart is disabled
enabling the second UART
vor UBUNTU 20.04
$ fdtput -t s /media/boot/meson64_odroidn2.dtb /serial@ffd24000 status "okay" $ fdtget /media/boot/meson64_odroidn2.dtb /serial@ffd24000 status # returns okay reboot
- After the reboot you can list the available UARTs by typing the following command
ls -al /dev/ttyS? # returns crw--w---- 1 root tty 238, 0 May 28 18:36 /dev/ttyS0 crw-rw---- 1 root dialout 238, 1 Jan 29 2018 /dev/ttyS1
- Two UARTs are available - /dev/ttyS0 for console usage and /dev/ttyS1 which we will use for MIDI
mit UBUNTU > 20.04
Enabling 31250 UART-Baud-Rate for Midi-Usage
- The baud-rate 31250 which is used for MIDI-traffic is normally NOT supported on standard UART drivers.
- We have to tweek the UART-Kernel-driver for supporting this baud rate. This sounds like a complicated action, but it isn't really complicated - take a look on this article in the Odroid-Magazine -> ODROID-N2 UART Custom Baud Rate for MIDI
linux/drivers/amlogic/uart/meson_uart.c
static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
{
u32 val;
struct meson_uart_port *mup = to_meson_port(port);
struct platform_device *pdev = to_platform_device(port->dev);
while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_EMPTY))
cpu_relax();
#ifdef UART_TEST_DEBUG
if (port->line != 0)
baud = 115200;
#endif
// this part is added.
// trace_printk() is not neccesarry, it is just for debugging.
trace_printk("Your baudrate: %ld\n", baud);
if(baud == 38400)
{
baud = 31250;
trace_printk("Change to %ld\n", baud);
}
Cross-Compiling or compiling the Kernel natively (on the Odroid-N2 itself)
- You have the possibility to compile the Kernel external (e.g. on your Desktop-PC/Laptop) where you have to install the Cross-Compiler-Toolchain and the other build utilities) or directly on the Odroid itself.
- I am a fan of doing it directly on the Odroid-N2 itself. Therefore I describe this procedure first.
compiling the Kernel natively on the Odroid-N2
getting the Kernel-Sources
- changing the user to be "root"
$ sudo su --> enter your root password
Attention: Be careful - the root-user can do really everything on the system - also damaging the running OS
- going to the directory where you want to build the kernel
$ cd /usr/src/
- install the source code version control system software "git":
$ apt install git
- going into the kernel-root-path
$ cd /usr/src/linux/
- getting the kernel-sources (cloning) from github:
$ git clone --depth 1 https://github.com/hardkernel/linux.git -b odroidg12-4.9.y
configuring the kernel
- configuring the base configuration of the kernel
$ make odroidg12_defconfig
- edit the uart-driver with an editor of your choice - for me it's the editor "vi" -> $ vi /usr/src/linux/drivers/amlogic/uart/meson_uart.c
- alter there the function meson_uart_change_speed to the following:
static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
{
u32 val;
struct meson_uart_port *mup = to_meson_port(port);
struct platform_device *pdev = to_platform_device(port->dev);
while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_EMPTY))
cpu_relax();
#ifdef UART_TEST_DEBUG
if (port->line != 0)
baud = 115200;
#endif
// this part is added.
// trace_printk() is not neccesarry, it is just for debugging.
trace_printk("Your baudrate: %ld\n", baud);
if(baud == 38400)
{
baud = 31250;
trace_printk("Change to %ld\n", baud);
}
- save your file!
additional kernel-config
- if you want to add other stuff to the kernel config you can do this by using the command "make menuconfig"
- if "make menuconfig" could not be startet because auf missing curses-support you have to install the libncurses-dev package
$ apt install libncurses-dev $ make menuconfig
compiling the kernel
$ make -j7
install kernel-modules
$ make modules_install
install new kernel and the new flattened device tree
$ cp -f arch/arm64/boot/Image.gz arch/arm64/boot/dts/amlogic/meson64_odroidn2.dtb /media/boot/ $ sync $ reboot
make a MIDI device out of the ttyS1 by using ttyMIDI
- launchpad: ttymidi
- github/sexeight7/ttymidi with system exclusive data ->
- for compilation:
gcc ttymidi.c -o ttymidi -lasound -pthread
- Warning when compiling ttymidi out-of-the-box:
ttymidi.c:533:1: warning: return type defaults to ‘int’ [-Wimplicit-int] main(int argc, char** argv)
- you can avoid this "compiler-hint" just by adding an "int" bevor "main"
change line 533 to: int main(int argc, char** argv)
ttyMIDI Aufruf
- If we use Debian or Ubuntu wei need libasound2-dev installed to be able to compile ttyMIDI with sys-exclusive support
$ ./ttymidi -s /dev/ttyS1 -b 38400
Adding ADC (Audio-Input) to Odroid N2 - EXPERIMENTAL
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