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BeagleBoneBlack(BBB) Initial Setup

BBB Web Interface

• The BBB Debian OS running on the BBB board already runs a web server. You can connect to it using its IP address (192.168.7.2).

  Here, you wil be directed to online IDE where you can test-run various demos to see if your initial board setting is correct.

• BBB board supports Ethernet over USB cable so you need not connect Ethernet cable to your board. Just connect your board with your host machine via USB cable.

• First install network driver. On ubuntu, go to /media/klee/BEAGLEBONE/Drivers/Linux/FTDI/ and run mkudevrule.sh file.

• To check the connection of the board to the host machine, open a terminal and ping 192.168.7.2.

SYSFS

• SYSFS, is a type of a file system which does not support physical persistent storage.

• It is an on-the-fly file system and exists on RAM.

• It is a kind of window for the user space to peek the various subsystem of the Linux kernel such the networking subsystem, memory subsystem, bus interfaces, hardware devices, device drivers, etc.

  Kernel space details are exposed under /sys for the user applications.

  xxxxxxxxxx
  2
  1
  debian@beaglebone:/sys$ ls
  2
  block  bus  class  dev  devices  firmware  fs  kernel  module  power
  

  Example 1 - Set LED USR3 to a heartbeat sequence, deafault-on, and none.

  xxxxxxxxxx
  7
  1
  debian@beaglebone:/sys$ cd class/leds/beaglebone\:green\:usr3
  2
  debian@beaglebone:/sys/class/leds/beaglebone:green:usr3$ ls
  3
  brightness  device  max_brightness  power  subsystem  trigger  uevent
  4
  
  5
  debian@beaglebone:/sys/class/leds/beaglebone:green:usr3$ echo 'heartbeat' > trigger
  6
  debian@beaglebone:/sys/class/leds/beaglebone:green:usr3$ echo 'default-on' > trigger
  7
  debian@beaglebone:/sys/class/leds/beaglebone:green:usr3$ echo 'none' > trigger
  

  Monitor LED USR3 if it operates accordingly!

• We'll be writing lots of C applications to access peripherals via SYSFS, like LCD, EEPROM, I2C sensor, 7-segment display, SPI, ADC, etc in this course.

References

Nayak, K. (2022). Embedded Linux Step by Step Using Beaglebone Black [Video file]. Retrieved from https://www.udemy.com/course/embedded-linux-step-by-step-using-beaglebone/