Usb to serial problem

Hello,

I'm trying to use a LoRa module using the usb port of the SIMATIC. The problem is, when I plug the module into the usb port and I look the dmesg result, it just print :

usb 2-1: new full-speed USB device number 4 using ohci-pci

and that's all... So I don't know if there is a "/dev/tty.." associated to the module or anything else...

I also tryed to plug the module into my computer (ubuntu 16.04) and the dmesg result is :

That's likely due to missing CONFIG_USB_ACM=y (or m) in the kernel config that is used for the example image.

Do you feel like rebuilding an image of your own? Then you can inject this into meta-iot2000/meta-iot2000-bsp/recipes-kernel/linux/files/iot2000.cfg.

Thanks for your reply !

Do you know a tutorial which describes how to do it ? Or if an image with this modification already exist ?  

Hey,

maybe this post might be helpful.

Best Regards

Check out https://github.com/siemens/meta-iot2000. There is a basic README for setting up the build, but this is currently more a delta to a standard Yocto setup (https://www.yoctoproject.org/docs/current/yocto-project-qs/yocto-project-qs.html). You will need a linux system to perform the image build. Can be a VM as well, but that's typically slower. Once you can run "bitbake iot2000-example-image" successfully, you are almost done. The change itself is trivial:

diff --git a/meta-iot2000-bsp/recipes-kernel/linux/files/iot2000.cfg b/meta-iot2000-bsp/recipes-kernel/linux/files/iot2000.cfg
index 59c76d1..a62d660 100644
--- a/meta-iot2000-bsp/recipes-kernel/linux/files/iot2000.cfg
+++ b/meta-iot2000-bsp/recipes-kernel/linux/files/iot2000.cfg
@@ -55,3 +55,5 @@ CONFIG_RTC_CLASS=y
 CONFIG_UIO=m
 
 CONFIG_ACPI_INITRD_TABLE_OVERRIDE=y
+
+CONFIG_USB_ACM=m

Will make this available as a patch soon.

Update: https://github.com/siemens/meta-iot2000/pull/34

Thanks for your reply ! 

To build the new image I followed this tutorial. But when I finally try to build the iot2000-example-image, I have this error : 

That description does not yet take into account that we updated the yocto baseline in meta-iot2000. Please check against the included README.md files which repos and revisions are now needed.

I've dropped that site a note already to refresh their description.