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BeagleBone-setup.md

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Building

  • SSL install is broken; disable certs:

      git config --global http.sslVerify false

  • Checkout LEDscape and build both PRU and teensy LEDscape code.

      git clone https://[email protected]/osresearch/LEDscape
  cd LEDscape
  make

Teensy config

  • Code is in LEDscape/VideoDisplay

  • Update LED_WIDTH to have the maximum length of the strips

  • Rebuild and flash to all teensys (do this on the laptop)

  • Find the teensy serial IDs with the find-serial tool in LEDscape:

      root@beaglebone:~/LEDscape# ./find-serial 
  /dev/ttyACM0: 8998
  /dev/ttyACM1: 14401
  /dev/ttyACM2: 14389
  /dev/ttyACM3: 8987

  • Update config.txt. At the minimum it needs the first line with the maximum strip length and the UDP port number, and four lines for the teensy serial IDs and their X-offset in the image buffer. It is ok to have teensys that are not in use with this BBB so that the same config file can be used with all of them.

      9999 # UDP port

    64,210 # Image width x height 14401,0 14389,8 8987,16,1:9,0:8 8998,24

  • If there are any bad pixels, they go on the line with that ID. In the above example, there are two bad pixels, both on the same teensy. Pixel #9 on strip #1 and pixel #8 on strip #0 are marked as "bad" and will not be set to anything other than black. Bad pixels are measured from the start of the strip, not the image.

  • Run teensy-rx-udp on the BeagleBone. It should report opening all four serial ports and querying them to find out their configured pixel lengths (which must match the config file):

      root@beaglebone:~/LEDscape# ./teensy-udp-rx config.txt
  8987: bad 1:9
  8987: bad 0:8
  /dev/ttyACM0: ID 8998 width 10
  /dev/ttyACM1: ID 14401 width 10
  /dev/ttyACM2: ID 14389 width 10
  /dev/ttyACM3: ID 8987 width 10

  • If a device is cleanly unplugged and replugged, it should report:

      teensy_open:286: /dev/ttyACM1: read failed: Resource temporarily unavailable
  main:508: /dev/ttyACM1: write failed: No such device
  /dev/ttyACM1: ID 14401 width 10

USB problems

  • USB devices don't show up when the teensy is not plugged in during startup.

  • Clean disconnect from HUB is OK.

  • Power kill to the teensys and reconnect is not:

      [  243.372796] musb_stage0_irq 496: bogus host RESUME (b_peripheral)

  • power management seems to just hose the port.

  • but.... lsusb -v seems to bring them back?

  • Solution:

      while true; do
  	lsusb -v > /dev/null
  	sleep 5
  done