Using WiFi on mangOH Red + wp76xx running Legato 19.02 AF

mangOH Red
3

Finally I managed to get it working. Here is a brief description, in case somebody finds it useful. Note that I followed the documentation regarding “Leaf Workspace Manager”, so in my mangOH development VM I have ~/myWorkspace folder where I tested the different tutorials described in the documentation.

In the Sample Apps section of the documentation there are multiple WiFi sample apps listed, which I found in $LEGATO_ROOT/modules/WiFi/apps/sample folder. I decided to copy the $LEGATO_ROOT/modules/WiFi folder into myWorksape folder and work locally in myWorkspace.

To enable the onboard MediaTek WiFi support, I found it useful to follow the instructions described in the “mangoh Red WiFi and IoT card WiFi on WP76” video.

From my initial trial to make WiFi work I was missing several steps, which I describe below:

  • As I describe in my initial post, I was following the “mangOH Red mt7697 WiFi using WPx5xx, WP76xx or WP77xx” instructions.
  • As I was working on a Leaf workspace deployment based on Legato 19.02, I stop following the instructions once I got to the “Patch Legato” section.
  • Now, back to myWorkspace folder, “cd ~/myWorkspace/WiFi”. Copy the ~/mangOH/linux_kernel_modules into the WiFi folder.
  • Edit the wifi.sdef file and include some required kernel modules:
    kernelModules:
    {
    linux_kernel_modules/mt7697wifi/mt7697wifi_core
    linux_kernel_modules/cp2130/cp2130
    linux_kernel_modules/mt7697q/mt7697q
    linux_kernel_modules/mt7697serial/mt7697serial
    }
  • Rebuild the new system deployment using the wifi.sdef definition file “mksys -t wp76xx wifi.sdef”
  • Update the new system deployment “update wifi.wp76xx.update 192.168.2.2”
  • Deploy required WiFi scripts. I used the approach described in the video above. Alternatively you can:
    cd linux_kernel_modules/mt7697wifi/scripts
    scp mtwifi root@192.168.2.2:/etc/init.d/mtwifi
    scp interfaces root@192.168.2.2:/etc/network/interfaces
  • Make the WiFi init script executable in the target:
    ssh root@192.168.2.2
    chmod +x /etc/init.d/mtwifi
  • Setup the UART; run these commands on the target
    Run microcom /dev/ttyAT
    Run the AT command at!mapuart=17,1 to configure UART1 for use with mt7697 WiFi
    Press ctrl-x to exit
    Power cycle the mangOH Red

After system power cycle, I was able to ssh into the target and run the command “/sbin/ifup wlan1” which successfully enabled the wlan1 interface. You can see it listed by running the command “ifconfig -a”