MCU-PLUS-SDK-AM243X: USB fails to enumerate endpoints when Ethernet code is added

Paul Hanson

Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: SYSCONFIG

I am attempting to create a project that combines the USB CDC echo FreeRTOS on the AM243xEVM R5FSS0-0, and the Ethernet LwIP FreeRTOS ICSSG on the AM243xEVM R5FSS0-0. I started with the CDC echo project, and tested it. Next, I combined the sysconfig from the two projects, and re-tested the CDC echo. I modified linker.cmd to put the code into DDR RAM, and successfully retested the CDC echo. I then modified the code in main.c to accommodate adding the Ethernet project, and successfully tested the CDC echo. The USB CDC echo tested fine until I added the Ethernet code to the project. The Ethernet code did not execute, it was just added to the build. Once the Ethernet code was added, the USB stopped enumerating the endpoints used in the CDC echo project. Any idea what needs to be changed in order to fix this issue?

Thanks,

Paul

over 4 years ago

0 Ming Wei over 4 years ago

TI__Guru 56435 points

Hi Paul,

My guess is the main task of the enet example uses priority MAIN_TASK_PRI (15 the highest) and the main task of the USB cdc example uses priority TUD_TASK_PRI (14) and CDC_TASK_PRI (13). Both USN CDC and Enet examples are using CPU polling mode, so the USB CDC example never get a chance to run.

To confirm the above, you can change the priority of main task of the enet example from 15 to 10. It will at least make the USB CDC example work again.

Best regards,

Ming

0 Paul Hanson over 4 years ago in reply to Ming Wei

Prodigy 195 points

I did adjust the task priorities as part of my modification of main.c. I made TUD_TASK_PRI the highest priority, CDC_TASK_PRI second highest, and made the enet task the third highest priority.

0 Ming Wei over 4 years ago in reply to Paul Hanson

TI__Guru 56435 points

Hi Paul,

How is your "freertos_main" looks like? Which one you called first? cdc_echo_main() or enet_lwip_example()? Can you share your source code?

Best regards,

Ming

0 Paul Hanson over 4 years ago in reply to Paul Hanson

Prodigy 195 points

I found the problem. I had two calls to vTaskDelete() in the same task.

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MCU-PLUS-SDK-AM243X: USB fails to enumerate endpoints when Ethernet code is added