| # Building and Running CHIP Linux Examples for i.MX 8M Mini EVK |
| |
| This document describes how to build below Linux examples with the NXP embedded |
| Linux Yocto SDK and then run the output executable files on the **NXP i.MX 8M** |
| **Mini EVK** development board. |
| |
| - [CHIP Linux All-clusters Example](../../examples/all-clusters-app/linux) |
| - [CHIP Linux Lighting Example](../../examples/lighting-app/linux) |
| - [CHIP Linux Thermostat Example](../../examples/thermostat/linux) |
| |
| This document has been tested on: |
| |
| - x64 host machine to build (cross-compile) the example |
| 1. running Ubuntu for 64bit PC(AMD64) desktop 20.04 LTS. |
| - **NXP i.MX 8M Mini EVK** board to run the example |
| 1. running Yocto image generated from the NXP released Yocto source code. |
| |
| The Yocto Project is an open source collaboration project focused on embedded |
| Linux OS development. For more information about this project, see the |
| [Yocto Project page](https://www.yoctoproject.org/). |
| |
| <hr> |
| |
| - [Building and Running CHIP Linux Examples for i.MX 8M Mini EVK](#building-and-running-chip-linux-examples-for-imx-8m-mini-evk) |
| - [Building](#building) |
| - [Commandline arguments](#commandline-arguments) |
| - [Running the Examples on i.MX 8M Mini EVK](#running-the-examples-on-imx-8m-mini-evk) |
| |
| <hr> |
| |
| <a name="building"></a> |
| |
| ## Building |
| |
| Before building the CHIP Linux Examples, the Yocto source code released by NXP |
| needs to be downloaded, then the Yocto SDK and the EVK Linux SD card image need |
| to be generated. |
| |
| - Download the Yocto source code and generate the Yocto SDK and the SD card |
| image |
| |
| The Yocto source code is maintained with a repo manifest, the tool `repo` is |
| used to download the source code. |
| |
| This document is tested with the i.MX Yocto 5.10.35_2.0.0 release. Run the |
| commands below to download this release: |
| |
| $ mkdir ~/bin |
| $ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo |
| $ chmod a+x ~/bin/repo |
| $ export PATH=${PATH}:~/bin |
| |
| $ mkdir yocto # this directory will be the top directory of the Yocto source code |
| $ cd yocto |
| $ repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-hardknott -m imx-5.10.35-2.0.0.xml |
| $ repo sync |
| |
| To build the Yocto Project, some packages need to be installed. The list of |
| packages required are: |
| |
| $ sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib \ |
| build-essential chrpath socat cpio python3 python3-pip python3-pexpect \ |
| xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev \ |
| pylint3 xterm |
| |
| More information about the downloaded Yocto release can be found in the |
| corresponding i.MX Yocto Project User’s Guide which can be found at |
| [NXP official website](www.nxp.com/imxlinux). |
| |
| Change the current directory to the top directory of the Yocto source code |
| and execute the commands below to generate the Yocto SDK: |
| |
| $ MACHINE=imx8mmevk DISTRO=fsl-imx-xwayland source ./imx-setup-release.sh -b bld-xwayland |
| $ bitbake imx-image-core -c populate_sdk |
| |
| After the execution of the previous two commands, the SDK installation file |
| can be found at tmp/deploy/sdk as a shell script. With the test environment |
| of this document, the installation file name is: |
| |
| > fsl-imx-xwayland-glibc-x86_64-imx-image-core-cortexa53-crypto-imx8mmevk-toolchain-5.10-hardknott.sh |
| |
| Change the current directory to the top directory of the Yocto source code |
| and execute the commands below to generate the Yocto SD card image: |
| |
| $ MACHINE=imx8mmevk DISTRO=fsl-imx-xwayland source ./imx-setup-release.sh -b bld-xwayland |
| $ echo "IMAGE_INSTALL_append += \"libavahi-client\"" >> conf/local.conf |
| $ bitbake imx-image-core |
| |
| The Yocto image can be found at |
| tmp/deploy/images/imx8mmevk/imx-image-core-imx8mmevk.wic.bz2. The `bzip2` |
| command should be used to unzip this file then the `dd` command should be |
| used to program the output file to a microSD card by running the commands |
| below. Then the microSD card can be used with the **i.MX 8M Mini EVK**. |
| |
| **Be cautious when executing the `dd` command below, make sure the `of` |
| represents the microSD card device!**, `/dev/sdc` in the command below |
| represents a microSD card connected to the host machine with a USB adapter, |
| however the output device name may vary. |
| |
| $ bzip2 -d imx-image-core-imx8mmevk-20210812084502.rootfs.wic.bz2 |
| $ sudo dd if=imx-image-core-imx8mmevk-20210812084502.rootfs.wic of=/dev/sdc bs=4M conv=fsync |
| |
| - Install the NXP Yocto SDK and set toolchain environment variables. |
| |
| Execute the SDK installation file with root permission. |
| |
| $ sudo tmp/deploy/sdk/fsl-imx-xwayland-glibc-x86_64-imx-image-full-cortexa53-crypto-imx8mmevk-toolchain-5.10-hardknott.sh |
| |
| After the Yocto SDK is installed on the host machine, an environment setup |
| script is also generated, and there are prompt lines telling the user to |
| source the script each time when using the SDK in a new shell, for example: |
| |
| $ . /opt/fsl-imx-xwayland/5.10-hardknott/environment-setup-cortexa53-crypto-poky-linux |
| |
| - Build the example application: |
| |
| Assuming that the working directory has been changed the CHIP Linux Examples |
| code, all the other steps are the same. |
| |
| # If the all-clusters example is to be built |
| $ cd ~/connectedhomeip/examples/all-clusters-app/linux |
| |
| # If the lighting example is to be built |
| $ cd ~/connectedhomeip/examples/lighting-app/linux |
| |
| # If the thermostat example is to be built |
| $ cd ~/connectedhomeip/examples/thermostat/linux |
| |
| $ git submodule update --init |
| $ source third_party/connectedhomeip/scripts/activate.sh |
| $ PLATFORM_CFLAGS='-DCHIP_DEVICE_CONFIG_WIFI_STATION_IF_NAME=\"mlan0\"", "-DCHIP_DEVICE_CONFIG_LINUX_DHCPC_CMD=\"udhcpc -b -i %s \"' |
| $ PKG_CONFIG_SYSROOT_DIR=${PKG_CONFIG_SYSROOT_DIR} \ |
| PKG_CONFIG_LIBDIR=${PKG_CONFIG_PATH} \ |
| gn gen out/aarch64 --args="target_os=\"linux\" target_cpu=\"arm64\" arm_arch=\"armv8-a\" |
| import(\"//build_overrides/build.gni\") |
| target_cflags=[ \"--sysroot=${SDKTARGETSYSROOT}\", \"${PLATFORM_CFLAGS}\" ] |
| target_ldflags = [ \"--sysroot=${SDKTARGETSYSROOT}\" ] |
| custom_toolchain=\"\${build_root}/toolchain/custom\" |
| target_cc=\"${OECORE_NATIVE_SYSROOT}/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gcc\" |
| target_cxx=\"${OECORE_NATIVE_SYSROOT}/usr/bin/aarch64-poky-linux/aarch64-poky-linux-g++\" |
| target_ar=\"${OECORE_NATIVE_SYSROOT}/usr/bin/aarch64-poky-linux/aarch64-poky-linux-ar\"" |
| $ ninja -C out/aarch64 |
| |
| The executable file is built under out/aarch64, it can be executed on the |
| **i.MX 8M Mini EVK** which running the Yocto image previously generated as |
| described in the sections above. |
| |
| <a name="command-line-args"></a> |
| |
| ## Commandline arguments |
| |
| The generated executable files supports to work with below commandline argument: |
| |
| - `--wifi` |
| |
| Enables Wi-Fi management feature. Required for Wi-Fi provisioning. |
| |
| The Wi-Fi device on **i.MX 8M Mini EVK** is a module based on the NXP |
| 88W8987 Wi-Fi/Bluetooth SoC. |
| |
| - `--ble-device <interface id>` |
| |
| Use the specific Bluetooth interface for BLE advertisement and connections. |
| |
| `interface id`: the number after `hci` when listing BLE interfaces using the |
| `hciconfig` command, for example, `--ble-device 1` means using `hci1` |
| interface. Default: `0`. |
| |
| The BLE device on **i.MX 8M Mini EVK** is a module based on the NXP 88W8987 |
| Wi-Fi/Bluetooth SoC. |
| |
| <a name="running-complete-examples-on-imx8mmevk"></a> |
| |
| ## Running the Examples on i.MX 8M Mini EVK |
| |
| The steps and commands to run any of the examples are quite similar. |
| Thermostat-app is used as an example below. |
| |
| - Prerequisites |
| |
| By following the [Building](#building) section of this document, the Yocto |
| image is cross-compiled and programmed to a microSD card. |
| |
| Follow the steps below to setup the environment needed to run the example on |
| the **i.MX 8M Mini EVK**: |
| |
| - Plug the microSD card with Yocto image into the SD-card slot of the |
| **i.MX 8M** **Mini EVK**. |
| - Change the boot switch on the **i.MX 8M Mini EVK** board to boot from |
| MicroSD/SDHC2 based on the silkscreen print on the board. |
| - Use a Type-A to Micro-B cable to connect the DEBUG port of the **i.MX |
| 8M** **Mini EVK** to a host machine, and use a serial communication |
| program like minicom or Putty to connect to the debug interface. |
| - Power on the board to boot up the Yocto image, logging in with user name |
| `root` via the serial communication program. There is password for the |
| root user in the default Yocto image configuration. |
| - Copy the executable file chip-lighting-app to the **i.MX 8M Mini EVK**, |
| using either of the two methods below: |
| - Connect the **i.MX 8M Mini EVK** to ethernet via the onboard |
| ethernet port, then use the `scp` command on the host machine to |
| copy the executable file to the **i.MX 8M Mini EVK**. |
| - Use a U-disk to copy the executable file between the build machine |
| and the **i.MX 8M Mini EVK**. |
| |
| In order to test the CHIP protocol functions, another device on the same |
| network is needed to run the |
| [ChipDeviceController](../../src/controller/python) tool to communicate with |
| the **i.MX 8M Mini EVK**. |
| |
| The ChipDeviceController can be a laptop / workstation. Bluetooth |
| functionality is mandatory on this device. |
| |
| For the test environment used with this document, a Raspberry Pi is used to |
| run the ChipDeviceController tool. |
| |
| Follow the steps below to setup the controller environment on a Raspberry |
| Pi: |
| |
| - Install Ubuntu Server 20.04.2 LTS on the Raspberry Pi with reference to |
| this page: |
| [Install Ubuntu on a Raspberry Pi](https://ubuntu.com/download/raspberry-pi). |
| - Boot up Ubuntu on the Raspberry Pi |
| - Clone this connectedhomeip project |
| - Follow Python ChipDeviceController |
| [README.md](../../src/controller/python/README.md) document. Refer to |
| the "Building and installing" part to build the tool. |
| |
| - Running |
| |
| - Initialize the BT device on the **i.MX 8M Mini EVK** board |
| |
| $ modprobe moal mod_para=nxp/wifi_mod_para.conf # Load the Wi-Fi/BT firmware |
| $ hciattach /dev/ttymxc0 any 115200 flow # Initialize the BT device |
| |
| - Find the Bluetooth device id for **i.MX 8M Mini EVK** by executing the |
| command below. The number following string `hci` is the Bluetooth device |
| id, `0` in this example. |
| |
| $ hciconfig |
| hci0: Type: Primary Bus: USB |
| BD Address: 00:1A:7D:DA:71:13 ACL MTU: 310:10 SCO MTU: 64:8 |
| UP RUNNING |
| RX bytes:73311 acl:1527 sco:0 events:3023 errors:0 |
| TX bytes:48805 acl:1459 sco:0 commands:704 errors:0 |
| |
| - Run the Linux Example App |
| |
| $ /home/root/thermostat-app --ble-device 0 --wifi # The bluetooth device used is hci0 and support wifi network |
| |
| - Run [ChipDeviceController](../../src/controller/python) on the |
| controller device to communicate with **i.MX 8M Mini EVK** running the |
| example. |
| |
| $ sudo out/python_env/bin/chip-device-ctrl # execute the tool |
| chip-device-ctrl > connect -ble 3840 20202021 8889 # connect to i.MX 8M Mini EVK |
| chip-device-ctrl > zcl Thermostat SetpointRaiseLower 8889 1 0 mode=1 amount=10 # send command to i.MX 8M Mini EVK via BLE |
| |
| (Note that the last two commands `connect -ble 3840 20202021 8889` and |
| `zcl Thermostat SetpointRaiseLower 8889 1 0 mode=1 amount=10` are Python |
| CHIP Device Controller commands, not shell commands. The 3840 is the |
| target device's `discriminator`. The 20202021 is the `setup pin code`. |
| 8889 is the `node id` and if not input 8889 a random node id will be |
| assigned.) |
| |
| After the previous commands are executed, inspect the logs of both the |
| **i.MX 8M Mini EVK** and the controller device to observe connection and |
| control events. |
| |
| - Provision the **i.MX 8M Mini EVK** to a Wi-Fi AP with the following |
| commands by `NetworkCommissioning` Cluster. |
| |
| Command `AddWiFiNetwork` sends the target Wi-Fi AP's SSID and password. |
| The `${SSID}` and `${PASSWORD}` should be in plaintext format. At this |
| moment, Wi-Fi is still idle on the **i.MX8 Mini EVK**. |
| |
| Command `EnableNetwork` triggers the Wi-Fi AP connecting operation on |
| **i.MX8 Mini EVK**. |
| |
| chip-device-ctrl > zcl NetworkCommissioning AddWiFiNetwork 8889 0 0 ssid=str:${SSID} credentials=str:${PASSWORD} breadcrumb=0 timeoutMs=5000 |
| chip-device-ctrl > zcl NetworkCommissioning EnableNetwork 8889 0 0 networkID=str:${SSID} breadcrumb=0 timeoutMs=15000 |
| |
| - Make sure the controller device is connected to the same network of this |
| Wi-Fi AP because the Wi-Fi connection is established between the Wi-Fi |
| AP and the **i.MX8 Mini EVK** and mDNS only works on local network. |
| |
| Resolve the target device with DNS-SD and update the address of the |
| node. |
| |
| chip-device-ctrl > close-ble # Shutdown the BLE connection |
| chip-device-ctrl > resolve 8889 # The 8889 is the node ID. |
| chip-device-ctrl > zcl Thermostat SetpointRaiseLower 8889 1 0 mode=1 amount=10 # Now the ZCL command will be send via IP network. |
