lwc:hardware:beagle

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lwc:hardware:beagle [2023/05/16 16:51] – [Using Zita-njbridge] John Harrisonlwc:hardware:beagle [2026/06/06 06:38] (current) – John Harrison
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   * [[https://github.com/zestyping/openpixelcontrol|open pixel control]]:the real deal with simulator, examples, etc.   * [[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     * 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 ==== ==== Connecting ====
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   * [[https://www.youtube.com/watch?v=ZjIbCVujQFE|video tutorial]]   * [[https://www.youtube.com/watch?v=ZjIbCVujQFE|video tutorial]]
   - get jack running and playing audio on both machines   - get jack running and playing audio on both machines
-  - receiver will have some command similar to ''zita-n2j 10.42.0.1 9999''+  - 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 === === Jack ===
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   * starting: ''jackd -d alsa -d hw:1,0''   * starting: ''jackd -d alsa -d hw:1,0''
   * testing: ''mpg123-jack file_example_MP3_5MG.mp3''   * 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]]
  • lwc/hardware/beagle.1684273897.txt.gz
  • Last modified: 2023/05/16 16:51
  • by John Harrison