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BeagleConnect™ Greybus demo using BeagleConnect™ Freedom and BeaglePlay

BeaglePlay CC1352 Firmware

Build (Download and Setup Zephyr for BeaglePlay)

  1. Install prerequisites

    sudo apt update
    sudo apt install --no-install-recommends -y \
        gperf \
        ccache dfu-util \
        libsdl2-dev \
        libxml2-dev libxslt1-dev libssl-dev libjpeg62-turbo-dev libmagic1 \
        libtool-bin autoconf automake libusb-1.0-0-dev \
        python3-tk python3-virtualenv
  2. Download the latest Zephyr Release, extract it and cleanup

    sudo wget
    tar xf zephyr-sdk-0.16.3_linux-aarch64_minimal.tar.xz
    rm zephyr-sdk-0.16.3_linux-aarch64_minimal.tar.xz
  3. Run the Zephyr SDK Setup Script

    ./zephyr-sdk-0.16.3/ -t arm-zephyr-eabi -c
  4. Download and Initialize West. (Zephyr’s meta-tool)


    You may want to add /home/debian/.local/bin to your .bashrc file to make the West command available after a reboot

    pip3 install --user -U west
    export PATH="/home/debian/.local/bin:$PATH"
    west init -m --mr sdk-next zephyr-beagle-cc1352-sdk
    cd $HOME/zephyr-beagle-cc1352-sdk
  5. Setup a Python Virtual Environment and add our PATH Variables

    virtualenv zephyr-beagle-cc1352-env
    echo "export ZEPHYR_TOOLCHAIN_VARIANT=zephyr" >> $HOME/zephyr-beagle-cc1352-sdk/zephyr-beagle-cc1352-env/bin/activate
    echo "export ZEPHYR_SDK_INSTALL_DIR=$HOME/zephyr-sdk-0.16.3" >> $HOME/zephyr-beagle-cc1352-sdk/zephyr-beagle-cc1352-env/bin/activate
    echo "export ZEPHYR_BASE=$HOME/zephyr-beagle-cc1352-sdk/zephyr" >> $HOME/zephyr-beagle-cc1352-sdk/zephyr-beagle-cc1352-env/bin/activate
    echo 'export PATH=$HOME/zephyr-beagle-cc1352-sdk/zephyr/scripts:$PATH' >> $HOME/zephyr-beagle-cc1352-sdk/zephyr-beagle-cc1352-env/bin/activate
    echo "export BOARD=beagleplay_cc1352" >> $HOME/zephyr-beagle-cc1352-sdk/zephyr-beagle-cc1352-env/bin/activate
    source $HOME/zephyr-beagle-cc1352-sdk/zephyr-beagle-cc1352-env/bin/activate
  6. Update West

    west update
    west zephyr-export
  7. Install Python Prerequisites

    pip3 install -r zephyr/scripts/requirements-base.txt
  8. Activate the Zephyr build environment

    NOTE - If you exit and come back, you’ll need to reactivate your Zephyr build environment.

    source $HOME/zephyr-beagle-cc1352-sdk/zephyr-beagle-cc1352-env/bin/activate
  9. Verify Zephyr setup for BeaglePlay

    (zephyr-beagle-cc1352-env) debian@BeaglePlay:~$ cmake --version
    cmake version 3.22.1
    CMake suite maintained and supported by Kitware (
    (zephyr-beagle-cc1352-env) debian@BeaglePlay:~$ python3 --version
    Python 3.9.2
    (zephyr-beagle-cc1352-env) debian@BeaglePlay:~$ dtc --version
    Version: DTC 1.6.0
    (zephyr-beagle-cc1352-env) debian@BeaglePlay:~$ west --version
    West version: v0.14.0
    (zephyr-beagle-cc1352-env) debian@BeaglePlay:~$ ./zephyr-sdk-0.16.3/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc --version
    arm-zephyr-eabi-gcc (Zephyr SDK 0.16.3) 12.1.0
    Copyright (C) 2022 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.  There is NO
  10. Clone CC1352 Firmware at top level:

    cd ~
    git clone
  11. Build the Firmware

    west build -b beagleplay_cc1352 -p always cc1352-firmware
  12. You can now find the built firmware at build/zephyr/zephyr.bin


  1. Ensure the gb-beagleplay driver isn’t blocking the serial port.

    debian@BeaglePlay:~$ echo "    fdtoverlays /overlays/k3-am625-beagleplay-bcfserial-no-firmware.dtbo" | sudo tee -a /boot/firmware/extlinux/extlinux.conf
    debian@BeaglePlay:~$ sudo shutdown -r now


    The default password is temppwd.

  2. Clone cc1352-flasher

    git clone
  3. Flash Firmware

    python $HOME/cc1352-flasher --beagleplay $HOME/zephyr-beagle-cc1352-sdk/build/zephyr/zephyr.bin
  4. Ensure the gb-beagleplay driver is set to load.

    sudo sed -e '/bcfserial-no-firmware/ s/^#*/#/' -i /boot/firmware/extlinux/extlinux.conf
    sudo shutdown -r now

Building gb-beagleplay Kernel Module


gb-beagleplay is still not merged upstream and thus needs to be built seperately. This should not be required in the future.

  1. Disable bcfserial driver. Add quiet module_blacklist=bcfserial to kernel parameters at /boot/firmware/extlinux/extlinux.conf (line 2) as shown below.

label Linux eMMC
    kernel /Image
    append root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait net.ifnames=0 quiet module_blacklist=bcfserial ①
    fdtdir /
    #fdtoverlays /overlays/<file>.dtbo
    #fdtoverlays /overlays/k3-am625-beagleplay-bcfserial-no-firmware.dtbo
    fdtoverlays /overlays/k3-am625-beagleplay-release-mikrobus.dtbo
    initrd /initrd.img

quiet module_blacklist=bcfserial has been added to this line

  1. Reboot

    debian@BeaglePlay:~$ sudo shutdown -r now
  2. Download the upstream module

    debian@BeaglePlay:~$ git clone
    debian@BeaglePlay:~$ cd beagleplay-greybus-driver
  3. Install dependencies

    debian@BeaglePlay:~$ sudo apt install linux-headers-$(uname -r)
  4. Build Kernel moudle

    debian@BeaglePlay:~/beagleplay-greybus-driver$ make
    make -C /lib/modules/5.10.168-ti-arm64-r111/build M=/home/debian/beagleplay-greybus-driver modules
    make[1]: Entering directory '/usr/src/linux-headers-5.10.168-ti-arm64-r111'
      CC [M]  /home/debian/beagleplay-greybus-driver/gb-beagleplay.o
      MODPOST /home/debian/beagleplay-greybus-driver/Module.symvers
      CC [M]  /home/debian/beagleplay-greybus-driver/gb-beagleplay.mod.o
      LD [M]  /home/debian/beagleplay-greybus-driver/gb-beagleplay.ko
    make[1]: Leaving directory '/usr/src/linux-headers-5.10.168-ti-arm64-r111'

Flashing BeagleConnect Freedom Greybus Firmware

  1. Connect BeagleConnect Freedom to BeaglePlay

  2. Build the BeagleConnect Freedom firmware

    west build -b beagleconnect_freedom modules/greybus/samples/subsys/greybus/net/ -p -- -DOVERLAY_CONFIG=overlay-802154-subg.conf
  3. Flash the BeagleConnect Freedom

    west flash

Run the Demo

  1. Connect BeagleConnect Freedom.

  2. See shell output using tio

    tio /dev/ACM0
  3. Press the Reset button on BeagleConnect Freedom

  4. Verify that greybus is working by checking the tio output. It should look as follows:

    [00:00:00.000,976] <dbg> greybus_platform_bus: greybus_init: probed greybus: 0 major: 0 minor: 1
    [00:00:00.001,068] <dbg> greybus_platform_string: greybus_string_init: probed greybus string 4: hdc2010
    [00:00:00.001,129] <dbg> greybus_platform_string: greybus_string_init: probed greybus string 3: opt3001
    [00:00:00.001,190] <dbg> greybus_platform_string: greybus_string_init: probed greybus string 2: Greybus Service Sample Application
    [00:00:00.001,251] <dbg> greybus_platform_string: greybus_string_init: probed greybus string 1: Zephyr Project RTOS
    [00:00:00.001,251] <dbg> greybus_platform_interface: greybus_interface_init: probed greybus interface 0
    [00:00:00.001,281] <dbg> greybus_platform_bundle: greybus_bundle_init: probed greybus bundle 1: class: 10
    [00:00:00.001,312] <dbg> greybus_platform_bundle: greybus_bundle_init: probed greybus bundle 0: class: 0
    [00:00:00.001,342] <dbg> greybus_platform_control: greybus_control_init: probed cport 0: bundle: 0 protocol: 0
    [00:00:00.001,434] <dbg> greybus_platform: gb_add_cport_device_mapping: added mapping between cport 1 and device gpio@40022000
    [00:00:00.001,464] <dbg> greybus_platform_gpio_control: greybus_gpio_control_init: probed cport 1: bundle: 1 protocol: 2
    [00:00:00.001,556] <dbg> greybus_platform: gb_add_cport_device_mapping: added mapping between cport 2 and device sensor-switch
    [00:00:00.001,556] <dbg> greybus_platform_i2c_control: greybus_i2c_control_init: probed cport 2: bundle: 1 protocol: 3
    *** Booting Zephyr OS build bcf-sdk-0.2.1-3384-ge76584f824c8 ***
    [00:00:00.009,704] <dbg> greybus_service: greybus_service_init: Greybus initializing..
    [00:00:00.009,765] <dbg> greybus_manifest: identify_descriptor: cport_id = 0
    [00:00:00.009,796] <dbg> greybus_manifest: identify_descriptor: cport_id = 1
    [00:00:00.009,826] <dbg> greybus_manifest: identify_descriptor: cport_id = 2
    [00:00:00.009,857] <dbg> greybus_transport_tcpip: gb_transport_backend_init: Greybus TCP/IP Transport initializing..
    [00:00:00.010,101] <inf> greybus_transport_tcpip: CPort 0 mapped to TCP/IP port 4242
    [00:00:00.014,709] <inf> greybus_transport_tcpip: CPort 1 mapped to TCP/IP port 4243
    [00:00:00.014,953] <inf> greybus_transport_tcpip: CPort 2 mapped to TCP/IP port 4244
    [00:00:00.015,075] <inf> greybus_transport_tcpip: Greybus TCP/IP Transport initialized
    [00:00:00.015,136] <inf> greybus_manifest: Registering CONTROL greybus driver.
    [00:00:00.015,167] <dbg> greybus: _gb_register_driver: Registering Greybus driver on CP0
    [00:00:00.015,411] <inf> greybus_manifest: Registering GPIO greybus driver.
    [00:00:00.015,411] <dbg> greybus: _gb_register_driver: Registering Greybus driver on CP1
    [00:00:00.015,625] <inf> greybus_manifest: Registering I2C greybus driver.
    [00:00:00.015,625] <dbg> greybus: _gb_register_driver: Registering Greybus driver on CP2
    [00:00:00.015,777] <inf> greybus_service: Greybus is active
  5. Load gb-beagleplay

    debian@BeaglePlay:~$ sudo insmod $HOME/beagleplay-greybus-driver/gb-beagleplay.ko
  6. Check iio_device to verify that greybus node has been detected:

    debian@BeaglePlay:~$ iio_info
    Library version: 0.24 (git tag: v0.24)
    Compiled with backends: local xml ip usb
    IIO context created with local backend.
    Backend version: 0.24 (git tag: v0.24)
    Backend description string: Linux BeaglePlay 5.10.168-ti-arm64-r111 #1bullseye SMP Tue Sep 26 14:22:20 UTC 2023 aarch64
    IIO context has 2 attributes:
            local,kernel: 5.10.168-ti-arm64-r111
            uri: local:
    IIO context has 2 devices:
            iio:device0: adc102s051
                    2 channels found:
                            voltage1:  (input)
                            2 channel-specific attributes found:
                                    attr  0: raw value: 4068
                                    attr  1: scale value: 0.805664062
                            voltage0:  (input)
                            2 channel-specific attributes found:
                                    attr  0: raw value: 0
                                    attr  1: scale value: 0.805664062
                    No trigger on this device
            iio:device1: hdc2010
                    3 channels found:
                            temp:  (input)
                            4 channel-specific attributes found:
                                    attr  0: offset value: -15887.515151
                                    attr  1: peak_raw value: 28928
                                    attr  2: raw value: 28990
                                    attr  3: scale value: 2.517700195
                            humidityrelative:  (input)
                            3 channel-specific attributes found:
                                    attr  0: peak_raw value: 43264
                                    attr  1: raw value: 41892
                                    attr  2: scale value: 1.525878906
                            current:  (output)
                            2 channel-specific attributes found:
                                    attr  0: heater_raw value: 0
                                    attr  1: heater_raw_available value: 0 1
                    No trigger on this device