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    Beaglebone Black (BBB) Board

    Uploaded by

    Sai Tulangekar

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    © All Rights Reserved
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    Beaglebone Black (BBB) Board

    Uploaded by

    Sai Tulangekar
    40 views32 pages

    Original Title

    BBB -Intro-TrafficControl

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    © © All Rights Reserved

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    Copyright:

    © All Rights Reserved
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    40 views32 pages

    Beaglebone Black (BBB) Board

    Uploaded by

    Sai Tulangekar

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 32

    BeagleBone Black (BBB) Board

    Introduction
    BeagleBone Black
    • low-cost, open source, community-supported
    development platform for ARM® Cortex™-A8
    processor
    • Shipped with the Debian GNU/Linux™ in onboard
    FLASH
    • Other Linux distributions and operating systems are
    also supported on BeagleBone Black including:
    – Ubuntu, Android, Fedora
    • http://www.ti.com/tool/beaglebk
    • http://beagleboard.org/
    • http://elinux.org/Beagleboard:BeagleBoneBlack –
    to get all h/w details
    • Blogs
    2
    BeagleBone Black Board

    3
    BeagleBone Black – Features
    • Processor : 1GHz AM3359 Sitara ARM Cortex-A8
    • On-chip 10/100 Ethernet
    • 512MB DDR3 RAM
    • 4GB 8-bit eMMC on-board flash storage with Debian
    GNU/Linux
    • USB client for power & communications
    • USB host
    • Ethernet
    • HDMI
    • 2x 46 pin headers (Expansion Connectors)

    eMMC - embedded Multi-Media Controller,flash memory


    and controller
    4
    BeagleBone Black – Programming
    • BoneScript: node.js based, open source,
    server side..apps written in javascript
    • Java, python, C, ruby,
    • C++ programming with Eclipse IDE with CDT

    • We use Python programming

    5
    Connecting BBB to PC/Laptop
    Connecting USB Cable to BBB
    BBB Power-on
    BBB Boot Status
    4 LEDS of BBB and their Status

    • USER0 is the heartbeat indicator from the


    Linux kernel
    • USER1 turns on when the microSD card is
    being accessed
    • USER2 is an activity indicator; It turns on when
    the kernel is not in the idle loop.
    • USER3 turns on when the onboard eMMC is
    being accessed
    BBB Boot Modes
    1. eMMC Boot – (THIS IS USED IN OUR CASE)
    • This is the default boot mode and will allow
    for the fastest boot time and will enable the
    board to boot out of the box using the pre-
    flashed OS image
    2. SD Boot –
    • This mode will boot from the microSD slot.

    3. Serial Boot –
    • This mode will use the serial port

    4. USB Boot –
    • This mode supports booting over the USB port
    Power Source to BBB
    • The board can be powered from four different
    sources: We use;
    1. A USB port on a PC
    2. A 5Volts DC,1Amp power supply plugged into
    the DC connector
    – For powering only BBB, USB cable to PC is
    enough
    – When peripherals are required to be
    connected to BBB, 5 volts DC, 1 Amp will be
    required along with USB connection
    Connecting 5Vots DC supply to BBB
    Expansion Connectors on BBB…
    P8 and P9
    Expansion Connectors and GPIO
    • General Purpose Input Output (GPIO) modules on AM 3359
    processor
    • P8 and P9 are Expansion Connectors on BBB.
    • There are 4 GPIO modules or ports in AM3359 processor which is
    present on BBB
    • Each module has 32 pins, thus 128 pins of GPIO
    • Out of 128, 92 pins are available on P8 and P9 (46 pins each)
    • This means, GPIO pins are mapped to P8 and P9 expansion
    connectors
    • These pins are made available to the user using CAPE which is
    located just above BBB
    • Out of 92, only 26 are available on FRC connector of the Cape
    • We will be using these 26 GPIO pins only
    Different commands …run these on BBB
    • Supervisor login at desktop
    #su
    # ssh 192.168.7.2
    Now you are connected to beaglebone black
    This is command line prompt for BBB
    cd / - BBB board root
    ls - lists different files present
    under root
    cd /sys
    df -a
    fdisk -l
    df -T /dev/mmcblk0p1 - prints
    file system type
    Programming BBB for PLIII
    • We will program in Python
    • Linux usually has build-in python support
    • To control all the GPIO using python, find a
    GPIO library for python
    • There are several GPIO libraries Python;
    PyBBIO and Adafruit_BBIO are most
    commonly used
    • We will use Adafruit_BBIO
    Using Adafruit_BBIO Library with BBB
     To use, import the library ; different options to import: GPIO, PWM, ADC
    1. first one is for GPIO:
    import Adafruit_BBIO.GPIO as GPIO
    setup()
    output()
    input()
    cleanup()
    2. Second is for PWM
    import Adafruit_BBIO.PWM as PWM

    Example for GPIO :


    import Adafruit_BBIO.GPIO as GPIO
    GPIO.setup("P8_10", GPIO.OUT)
    GPIO.output("P8_10", GPIO.HIGH)
    GPIO.output("P8_10", GPIO.LOW)
    GPIO.cleanup()
    Time Library in python
     This module provides various time-related functions
     time.sleep(secs) e.g.: time.sleep(10)
     Suspend execution of the current thread for the given
    number of seconds
     The argument may be a floating point number to
    indicate a more precise sleep time
     Import time module in our programs to generate delays
    GPIO Output
    • GPIO.setup(“Pin_Name”, GPIO.OUT) #Pin_Name such
    as P8_29, or GPIO2_1

    • GPIO.output(“Pin_Name”,GPIO.HIGH)#GPIO.HIGH for
    high or GPIO.LOW for low
    GPIO Input
    • GPIO.setup(“Pin_Name”, GPIO.IN) #Pin_Name such as
    P8_29, or GPIO2_1
    • E.g. 1:
    if (GPIO.input("P8_29")==0:
    # your logic
    • E.g. 2:
    if GPIO.input("P8_29"):
    print("HIGH")
    else:
    print("LOW")
    LED Blinking Code in Python
    import Adafruit_BBIO.GPIO as GPIO
    import time
    led = ['P9_11', 'P9_13', 'P9_15', 'P9_24', 'P9_12', 'P9_14', 'P9_16', 'P9_23',
    'P8_11', 'P8_13', 'P8_15', 'P8_17', 'P8_14', 'P8_16', 'P8_18', 'P8_12']
    for i in range(len(led)):
    GPIO.setup(led[i], GPIO.OUT)
    GPIO.output(led[i], GPIO.LOW)
    while True:
    GPIO.output("P9_15", GPIO.HIGH) # here LED connected to
    GPIO1_16 (P9_15) is made high
    print("high")
    time.sleep(8)
    GPIO.output("P9_15", GPIO.LOW)
    print("LOW")
    time.sleep(8)
    Traffic Light Controller

    EOS - Assignment No. 1


    Mapping P8 and P9 expansion
    connector pins to GPIO pins
    • LED used 16 in no, therefore 16 GPIO pins required!
    • GPIO pins are mapped to P8 and P9 Expansion Connectors
    on BBB
    • P8_11 => GPIO1_13, P8_12 => GPIO1_12,
    P8_13 => GPIO0_23, P8_14 => GPIO0_26,
    P8_15 => GPIO1_15, P8_16 => GPIO1_14,
    P8_17 => GPIO0_27, P8_18 => GPIO2_1,

    • P9_11 => GPIO0_30, P9_12 => GPIO1_28,


    P9_13 =>GPIO0_31, P9_14 => GPIO1_18,
    P9_15 => GPIO1_16, P9_16 => GPIO1_19,
    P9_23 => GPIO1_17, P9_24 => GPIO0_15,
    Traffic Light Controller Card Layout
    1st 74LS245
    Buffer/Latch VCC 26 25 GND

    P8_21 24 23 P8_19

    P9_12 22 21 P9_11

    19 P9_13
    P9_14 20

    17 P9_15
    P9_16 18

    15 P9_24
    P9_23 16

    P8_12 14 13 P8_11

    P8_14 12 11 P8_13

    P8_16 10 09 P8_15

    P8_18 08 07 P8_17

    P8_7 06 05 P8_8
    Traffic Light P8_10
    P8_9 04 03
    Junction-LEDS
    01 P9_17
    P9_18 02

    2nd 74LS245 FRC Connector


    Buffer/Latch
    FRC Connector on Cape
    VCC 26 25 GND

    P8_21 24 23 P8_19

    21 P9_11
    P9_12 22

    19 P9_13
    P9_14 20

    17 P9_15
    P9_16 18

    15 P9_24
    P9_23 16

    13 P8_11
    P8_12 14

    P8_14 12 11 P8_13

    P8_16 10 09 P8_15

    P8_18 08 07 P8_17

    P8_7 06 05 P8_8

    03 P8_10
    P8_9 04

    02 01 P9_17
    P9_18
    1st 74245
    2nd 74245
    Traffic Light Junction
    Hints!
    • Setup required P8 and P9 pins (GPIO pins) as
    output
    • Clear all LEDs first
    • Now implement traffic controller logic

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