LWB+ integration on imx8mpevk LWB+ integration on i.MX8M Plus EVK This tutorial shows how to integrate the LWB+ on the imx8mp-evk. The LWB+ uses SDIO for the Wi-Fi interface and UART for the Bluetooth interface. It is assumed the user is familiar with Linux and embedded systems. Included in this tutorial are the physical setup, Yocto setup and build, and verifying the Wi-Fi and Bluetooth are functional. Requirements Required items: imx8mp-evk LWB+ devkit - 453-00085-K1 breadboard jumper wires SD to micro SD adapter (Examples: ST-SD-USD, Cablecc) Physical setup i.MX 8M Plus (imx8mp) This tutorial uses the microSD slot on the imx8mp as the Wi-Fi interface. This requires the software to be loaded on to the emmc which can be done with the uuu utility with the Serial Download boot mode or using u-boot with the ums tool. The imx8mp bb expansion header is used to connect the power, Bluetooth UART, and REG_ON pins for Wi-Fi and Bluetooth. Schematic of the expansion header: The UART3 lines are used for the bluetooth UART. The ECSPI2 MOSI and SCLK are used for the REG_ON pins to control resets. LWB+ Jumper Position Use J4 2-3 VCCIO 3.3v J5 Ext Voltage from imx8 J6 1-2 VDD 3.3v J7 2-3 VBATT EXT Note on LWB+ and SD adapter Cut and place to shape two layers of stickers on the LWB+ and the adapter board that goes into the imx8mp and micro SD to SD adapter to ensure the devices are not loose. Example used here is a UPS tracking receipt that is a label. The label is thin thus requiring 2-4 layers on each. This connection can be very sensitive and delicate, so ensure it’s supported properly and not bending the micro sd tab which is the vulnerable point of the connection. Physical Connections LWB+ LWB+ Notes imx8mp imx8mp Notes J3.6 BT CTS -> J21.7 uart3.cts J3.8 BT TXD -> J21.10 uart3.rxd J3.10 BT RXD -> J21.8 uart3.txd J3.14 BT RTS -> J21.11 uart3.rts J3.16 GND -> J21.9 GND J3.11 WL_REG_ON J21.23 GPIO5.io10 J3.13 BT_REG_ON J21.19 GPIO5.io11 J5.3.3 3.3v input <- J21.1 3.3v supply J5.GND GND <- J21.6 GND Yocto setup and build Get yocto-honister repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-honister -m imx-5.15.5-1.0.0.xml repo sync DISTRO=fsl-imx-wayland MACHINE=imx8mpevk source imx-setup-release.sh -b build-imx8mpevk Get meta-summit-radio cd ../sources git clone https://github.com/LairdCP/meta-summit-radio Update image in ~/projects/yocto-honister/sources/meta-summit-radio/meta-summit-radio/recipes-packages/images tal-lwbp-su-lrd10.bb copied from sample-image-cp-lwb5plus.bb and edited the below: Note: for Yocto projects 3.3 (Hardknott) and earlier you would update the file located in ~/projects/yocto-honister/sources/meta-summit-radio/meta-summit-radio-pre-3.4/recipes-packages/images IMAGE_INSTALL += "\ iproute2 \ rng-tools \ ca-certificates \ tzdata \ alsa-utils \ htop \ ethtool \ iperf3 \ tcpdump \ iw \ kernel-module-lwb-backports-summit \ lwbplus-firmware \ sterling-supplicant-lwb \ summit-networkmanager-st60 \ libgpiod \ libgpiod-tools \ hostapd \ " build-imx8mpevk/conf/bblayers.conf BBLAYERS += "${BSPDIR}/sources/meta-summit-radio/meta-summit-radio" Note: for Yocto projects 3.3 (Hardknott) and earlier you would enter this: BBLAYERS += "${BSPDIR}/sources/meta-summit-radio/meta-summit-radio-pre-3.4" build-imx8mpevk/conf/local.conf PREFERRED_PROVIDER_wpa-supplicant = "sterling-supplicant-lwb" PREFERRED_PROVIDER_wpa-supplicant-cli = "sterling-supplicant-lwb" PREFERRED_PROVIDER_wpa-supplicant-passphrase = "sterling-supplicant-lwb" BBMASK += " \ meta-summit-radio/meta-summit-radio/recipes-packages/openssl \ meta-summit-radio/meta-summit-radio/recipes-packages/.*/.*openssl10.* \ " PREFERRED_RPROVIDER_wireless-regdb-static = "wireless-regdb" LWB_REGDOMAIN = "US" Note: for Yocto projects 3.3 (Hardknott) and earlier you would enter this: PREFERRED_PROVIDER_wpa-supplicant = "sterling-supplicant-lwb" PREFERRED_PROVIDER_wpa-supplicant-cli = "sterling-supplicant-lwb" PREFERRED_PROVIDER_wpa-supplicant-passphrase = "sterling-supplicant-lwb" BBMASK += " \ meta-summit-radio/meta-summit-radio-pre-3.4/recipes-packages/openssl \ meta-summit-radio/meta-summit-radio-pre-3.4/recipes-packages/.*/.*openssl10.* \ " PREFERRED_RPROVIDER_wireless-regdb-static = "wireless-regdb" LWB_REGDOMAIN = "US" ### kernel menuconfig bitbake -c menuconfig virtual/kernel Make the following modifications: ***In the menuconfig use / to search for each of the below configuration parameters in caps.*** WLAN deselect Device Drivers -> Network device support -> Wireless LAN CONFIG_BT deselect Networking support -> Bluetooth subsystem support WIRELESS deselect Networking support -> Wireless CONFIG_FW_LOADER_USER_HELPER_FALLBACK deselect Device Drivers -> Generic Driver Options -> Firmware Loader -> Firmware loading Facility ->Force the firmware sysfs fallback mechanism when possible CONFIG_IMX_SDMA set to module Device Drivers -> DMA Engine support -> i.MX SDMA support ``` Disable nxp drivers Comment out the whole section (4 lines): # NXP Wi-Fi firmware & extra Wlan SDK vi ..sources/meta-imx/meta-bsp/conf/layer.conf # NXP WiFi firmware & extra Wlan SDK #MACHINE_FIRMWARE:append = " ${@bb.utils.contains('MACHINE_FEATURES', 'nxp8987', 'linux-firmware-nxp89xx', '', d)}" #MACHINE_FIRMWARE:append = " ${@bb.utils.contains('MACHINE_FEATURES', 'nxp8997', 'linux-firmware-nxp89xx', '', d)}" #MACHINE_EXTRA_RRECOMMENDS:append = " ${@bb.utils.contains('MACHINE_FEATURES', 'nxp8987', 'nxp-wlan-sdk kernel-module-nxp89xx', '', d)}" #MACHINE_EXTRA_RRECOMMENDS:append = " ${@bb.utils.contains('MACHINE_FEATURES', 'nxp8997', 'nxp-wlan-sdk kernel-module-nxp89xx', '', d)}" Modify devicetree Below is a diff of the changes made in the devicetree as a patch. For reference: Original dtsi Modified dtsi for LWB+ Location of the devicetree is: ~/projects/yocto-honister/build-imx8mpevk/tmp/work-shared/imx8mpevk/kernel-source/arch/arm64/boot/dts/freescale/imx8mp-evk.dts cd ~/projects/yocto-honister/build-imx8mpevk/tmp/work-shared/imx8mpevk/kernel-source/arch/arm64/boot/dts/freescale/ --- imx8mp-evk.dts 2022-06-01 12:11:11.540506538 -0400 +++ imx8mp-evk.dts.lwbplus 2022-06-01 12:05:27.722792689 -0400 @@ -34,6 +34,26 @@ <0x1 0x00000000 0 0xc0000000>; }; + wifi_pwrseq: wifi-pwrseq { + compatible = "mmc-pwrseq-simple"; + regulator-name = "wifi-pwrseq"; + pinctrl-names = "default"; + reset-gpios = <&gpio5 10 GPIO_ACTIVE_LOW>; + post-power-on-delay-ms = <150>; + }; + + reg_bt: regulator-bt { + compatible = "regulator-fixed"; + regulator-name = "bt"; + gpio = <&gpio5 11 GPIO_ACTIVE_HIGH>; + startup-delay-us = <100>; + enable-active-high; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + regulator-always-on; + }; + reg_can1_stby: regulator-can1-stby { compatible = "regulator-fixed"; regulator-name = "can1-stby"; @@ -272,7 +292,8 @@ pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi2 &pinctrl_ecspi2_cs>; cs-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>; - status = "okay"; + //status = "okay"; + status = "disabled"; /* added */ spidev1: spi@0 { reg = <0>; @@ -888,8 +909,10 @@ pinctrl-0 = <&pinctrl_usdhc2>, <&pinctrl_usdhc2_gpio>; pinctrl-1 = <&pinctrl_usdhc2_100mhz>, <&pinctrl_usdhc2_gpio>; pinctrl-2 = <&pinctrl_usdhc2_200mhz>, <&pinctrl_usdhc2_gpio>; + max-frequency = <100000000>; cd-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>; vmmc-supply = <®_usdhc2_vmmc>; + mmc-pwrseq = <&wifi_pwrseq>; bus-width = <4>; status = "okay"; }; @@ -919,6 +942,8 @@ pinctrl_hog: hoggrp { fsl,pins = < + MX8MP_IOMUXC_ECSPI2_MOSI__GPIO5_IO11 0x00000146 + MX8MP_IOMUXC_ECSPI2_SCLK__GPIO5_IO10 0x00000146 MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL 0x400001c3 MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA 0x400001c3 MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD 0x40000019 bitbake bitbake tal-lwbp-su-lrd10 Flashing with u-boot and ums Ensure the usb-c cable from PORT1 is connected to the PC. Enter u-boot and enter the following command: ums 0 mmc 2 The emmc is now shown on the host PC and can be flash using dd in Linux or balenaetcher. bzip2 -dkf tal-lwbp-su-lrd10-imx8mpevk.wic.bz2 sudo dd if=tal-lwbp-su-lrd10-imx8mpevk.wic of=/dev/sdb bs=1M status=progress sync Reboot the device with the LWB+ attached. Test module Wi-Fi iw dev root@imx8mpevk:~# iw dev phy#0 Unnamed/non-netdev interface wdev 0x2 addr c2:ee:40:b0:03:9c type P2P-device txpower 31.00 dBm Interface wlan0 ifindex 5 wdev 0x1 addr c0:ee:40:b0:03:9c ssid dogfish type managed channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz txpower 31.00 dBm Wi-Fi iperf3 tests iperf3 -c 10.0.0.2 root@imx8mpevk:~# iperf3 -c 10.0.0.2 Connecting to host 10.0.0.2, port 5201 [ 5] local 10.0.0.37 port 38532 connected to 10.0.0.2 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 5.44 MBytes 45.6 Mbits/sec 0 226 KBytes [ 5] 1.00-2.00 sec 4.47 MBytes 37.5 Mbits/sec 0 266 KBytes [ 5] 2.00-3.00 sec 5.10 MBytes 42.7 Mbits/sec 0 266 KBytes [ 5] 3.00-4.00 sec 4.66 MBytes 39.1 Mbits/sec 0 266 KBytes [ 5] 4.00-5.00 sec 5.03 MBytes 42.2 Mbits/sec 0 277 KBytes [ 5] 5.00-6.00 sec 4.54 MBytes 38.1 Mbits/sec 0 277 KBytes [ 5] 6.00-7.00 sec 4.91 MBytes 41.2 Mbits/sec 0 277 KBytes [ 5] 7.00-8.00 sec 4.78 MBytes 40.1 Mbits/sec 0 277 KBytes [ 5] 8.00-9.00 sec 4.47 MBytes 37.5 Mbits/sec 0 277 KBytes [ 5] 9.00-10.00 sec 4.54 MBytes 38.1 Mbits/sec 0 277 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 47.9 MBytes 40.2 Mbits/sec 0 sender [ 5] 0.00-10.00 sec 47.4 MBytes 39.8 Mbits/sec receiver iperf Done. iperf3 -c 10.0.0.2 -R root@imx8mpevk:~# iperf3 -c 10.0.0.2 -R Connecting to host 10.0.0.2, port 5201 Reverse mode, remote host 10.0.0.2 is sending [ 5] local 10.0.0.37 port 38536 connected to 10.0.0.2 port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 6.14 MBytes 51.5 Mbits/sec [ 5] 1.00-2.00 sec 6.39 MBytes 53.6 Mbits/sec [ 5] 2.00-3.00 sec 6.43 MBytes 53.9 Mbits/sec [ 5] 3.00-4.00 sec 6.42 MBytes 53.9 Mbits/sec [ 5] 4.00-5.00 sec 6.40 MBytes 53.7 Mbits/sec [ 5] 5.00-6.00 sec 6.36 MBytes 53.4 Mbits/sec [ 5] 6.00-7.00 sec 6.29 MBytes 52.8 Mbits/sec [ 5] 7.00-8.00 sec 6.26 MBytes 52.5 Mbits/sec [ 5] 8.00-9.00 sec 6.41 MBytes 53.8 Mbits/sec [ 5] 9.00-10.00 sec 6.55 MBytes 55.0 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 66.5 MBytes 55.8 Mbits/sec 0 sender [ 5] 0.00-10.00 sec 63.7 MBytes 53.4 Mbits/sec receiver iperf Done. Bluetooth btattach -B /dev/ttymxc2 -P bcm -S 3000000 & root@imx8mpevk:~# btattach -B /dev/ttymxc2 -P bcm -S 3000000 & [1] 488 Attaching Primary controller to /dev/ttymxc2 [ 2929.323498] Bluetooth: HCI UART driver ver 2.3 [ 2929.327993] Bluetooth: HCI UART protocol H4 registered [ 2929.333521] Bluetooth: HCI UART protocol Broadcom registered root@imx8mpevk:~# Switched line discipline from 0 to 15 Device index 0 attached [ 2929.456927] Bluetooth: hci0: BCM: chip id 147 [ 2929.464112] Bluetooth: hci0: BCM: features 0x0e [ 2929.492213] Bluetooth: hci0: CYW4343A2 [ 2929.495986] Bluetooth: hci0: BCM4343A2 (001.003.016) build 0000 [ 2929.503453] Bluetooth: hci0: BCM4343A2 'brcm/BCM4343A2.hcd' Patch [ 2930.414080] Bluetooth: hci0: CYW43439 UART 26 MHz wlbga_BU Laird [ 2930.420123] Bluetooth: hci0: BCM4343A2 (001.003.016) build 0000 [ 2930.587952] NET: Registered PF_ALG protocol family [ 2930.606343] Bluetooth: RFCOMM TTY layer initialized [ 2930.611282] Bluetooth: RFCOMM socket layer initialized [ 2930.616521] Bluetooth: RFCOMM ver 1.11 root@imx8mpevk:~# bluetoothctl Agent registered [..CHG..] Controller C0:EE:40:B0:49:87 Pairable: yes [bluetooth]# power on [..CHG..] Controller C0:EE:40:B0:49:87 Class: 0x00200000 Changing power on succeeded [..CHG..] Controller C0:EE:40:B0:49:87 Powered: yes [bluetooth]# scan on Discovery started [..CHG..] Controller C0:EE:40:B0:49:87 Discovering: yes [..NEW..] Device D7:DD:31:1F:D7:CF D7-DD-31-1F-D7-CF [..NEW..] Device 7A:65:4F:4B:65:EF 7A-65-4F-4B-65-EF [..NEW..] Device E7:A3:99:CE:06:A2 BL654 BME280 Sensor Bluetooth troubleshooting Use lower speed if having issues with btattach, due to the length of jumper wires a higher speed connection might not work or be reliable. btattach -B /dev/ttymxc2 -P bcm -S 115200 &
