lwc:hardware:beagle [wiki]

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===== Beagle-related =====
//Beaglebone, Beagleboard Black, Green, and Friends//

  * boot MicroSD card: hold ''user'' button while applying power
    * will still boot from MicroSD with a ''reboot'' command
  * expand MicroSD partition after burning 4GB partition: ''sudo /opt/scripts/tools/grow_partition.sh''

==== LEDScape and friends ====
  * [[https://github.com/iontank/ThrowingBagels|Throwing Bagels]]: "modern" implementation of LEDScape
  * [[https://github.com/Geocene/LEDscape|Geocene]]: LEDScape that successfully compiles on Linux Kernel 4.19 (Debian Buster? 10)
    * to run you must [[http://www.ofitselfso.com/BeagleNotes/Enabling_the_UIO_Drivers_on_the_Beaglebone_Black.php|enable the UIO driver]]
  * [[http://openpixelcontrol.org/|open pixel control format]]
  * [[https://github.com/zestyping/openpixelcontrol|open pixel control]]:the real deal with simulator, examples, etc.
    * this code with examples shows how to format everything for LEDScape

=== Patches/Fixes/Gotchas ===
  * LEDScape (at least the Geocene version of it) uses 100% CPU
    * the issue is the DMX-over-network protocol is failing. If not using DMX then remove it
      * comment out around line 723 of ''opc-server.c'': ''pthread_create(&g_threads.e131_server_thread.handle, NULL, e131_server_thread, NULL);''
  * LEDScape is throwing kernel warnings in the terminal
    * mute the warnings with edits to ''/etc/rsyslog.conf''
      * add above the ''modules'' section of the file (toward the beginning): ''kern.=warning :omfile:/dev/null''
      * comment out at the end of the file: ''*.emerg                         :omusrmsg:*''
      * ''sudo systemctl restart rsyslog''
      * //change survives reboot//
  * for some reason ''mpg123-jack'' segfaults (most, not all the time) when LEDScape is running. Other JACK clients and the JACK server seem OK.
  * even when the # of strands is 1, it seems many of the pins in the P8 header are not usable when LEDScape/opc-server is running. An exception is GPIO 61 which seems to work fine regardless.

==== Connecting ====
  * The bone is running a DHCP client so if you run a DHCP server it will get assigned an IP address
  * username: `debian` pw: `temppwd`
  * The onboard flash is 4GB which makes it too small to do any updates on current OS
  * current OS: Linux beaglebone 4.9.78-ti-r94 #1 SMP PREEMPT Fri Jan 26 21:26:24 UTC 2018 armv7l GNU/Linux
  * current OS on 32GB MicroSD: Linux beaglebone 4.19.94-ti-r42 #1buster SMP PREEMPT Tue Mar 31 19:38:29 UTC 2020 armv7l GNU/Linux

==== Using Zita-njbridge ====
  * [[https://www.youtube.com/watch?v=ZjIbCVujQFE|video tutorial]]
  - get jack running and playing audio on both machines
  - receiver will have some command similar to ''zita-n2j 10.42.0.249 9999 --buff 50''
    - the ''--buff 50'' seems to eliminate distortion which was coming and going. The default is ''10''
  - receiver:
    - ''jack_connect zita-n2j:out_1 system:playback_1''
    - ''jack_connect zita-n2j:out_2 system:playback_2''
  - sender:
    - ''sudo jackd -d alsa''
    - ''sudo zita-j2n 10.42.0.249 9999 --16bit''
      - ''--16bit'' might not be necessary but seems prudent to keep network traffic down
    - testing: ''sudo mpg123-jack -a zita-j2n:in_1,zita-j2n:in_2 /tmp/file_example_MP3_5MG.mp3''
    - //fixme: we need to get rid of the sudos. This is just a test. Fixed my adding: ''usermod -a -G audio yourUserID'' as shown [[https://jackaudio.org/faq/linux_rt_config.html|here]]//
    - //fixme: distorting. Seems fixed with ''--buff 50''?//
    - //fixme: why transmit 2 channels when we only need 1?//

=== Jack ===
//using Griffin iMic//
  * starting: ''jackd -d alsa -d hw:1,0''
  * testing: ''mpg123-jack file_example_MP3_5MG.mp3''
  * change volume to 75%: ''amixer -c 1 -- sset PCM Playback 75%''
//using Amazon special//
  * ''amixer -c 1 -- sset Headphone Playback 100%''
or
  * ''amixer -c 1 -- sset Speaker 100%'' (for the one that has no cables)

===== Setting static IP for ethernet =====
  * ubuntu with shared ethernet connection runs a dhcp server by default on 10.42.x.x and assigns the ethernet card 10.42.0.1.
  * so the perhaps incorrect but easy way to get internet with static IP is on the beagle:
    * get name of connection: ''connmanctl services'' You'll get a response that will have something like: ''ethernet_6cecebabbc6a_cable''
    * then assign your static IP. This will be a persistent setting. Example:
<code>
sudo connmanctl config ethernet_6cecebabbc6a_cable --ipv4 manual 10.42.0.2 255.255.255.0 10.42.0.1 --nameservers 8.8.8.8 1.1.1.1
</code>
//for the morbidly curious you can find (and maybe edit?) the settings connman is reading/writing at ''/var/lib/connman'' //

===== Network tips =====
//see [[https://gist.github.com/kylemanna/6930087|Connmanctl Cheat Sheet]] for connecting Wi-Fi card//

===== Always booting from SD card =====
  - Manually boot from the MicroSD (hold down the ''user/boot'' button).
  - run ''sudo dd if=/dev/zero of=/dev/mmcblk1 bs=1M count=1'' to write zeros over the first 1MB of the eMMC
  - run ''sync''
  - run ''sudo shutdown now''
  - disconnect and then reconnect power
[[https://github.com/phillipdavidstearns/brahman-ai/tree/master/guides/beaglebone#towards-booting-from-microsd-always|source]]