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Original question:

LP-AM261: Adding USB CDC Virtual Com functionality to application

LP-AM261: USB CDC Echo is getting stuck

Nithin Kurian
Prodigy 120 points
Part Number: LP-AM261

Tool/software:

Hi

I was able to integrate CDC Echo functionality to application running on LP-AM261.

Firmware is sending back echo over usb virtual com

Our application is micrium uC/OS RTOS based.

Scenario 1 : USB_dwcTask, tud_task, cdc_task called in sequence in a single task

Enumeration and data transfer is working properly

Scenario 2:  USB_dwcTask and tud_task called in a task and cdc_task is called in another task

Enumeration and data transfer is working properly initially

But at some point, echo back is stopped working. (this behavior is random in nature)

While debugging we can see that transmit from PC is still reaching the device.

But echo back from the device is not coming to PC anymore.

What i understand is Endpoint 2 IN transactions stopped working

But if try to re-connect serial terminal application that is still happening. But echo back is not working

If we reconnect the USB cable again, then the device is still enumerating, and echo will be working again.

Logs from our testing script is given below:

2025-03-04 17:15:51 - __main__ - INFO - data_send_iteration:1
2025-03-04 17:15:51 - __main__ - INFO - delay_between_send:0.001s
2025-03-04 17:15:51 - __main__ - INFO - data_length_initial:1
2025-03-04 17:15:51 - __main__ - INFO - data_length_increment:1
2025-03-04 17:15:51 - __main__ - INFO - port_open_iteration:1
2025-03-04 17:15:51 - __main__ - INFO - delay_between_data_length:0
2025-03-04 17:15:51 - __main__ - INFO - data_length_final:100
2025-03-04 17:15:51 - __main__ - INFO - 1 1
2025-03-04 17:15:51 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:15:51 - __main__ - INFO - 1 bytes 1/1 messages received 1 bytes received
2025-03-04 17:15:51 - __main__ - INFO - 2 2
2025-03-04 17:15:51 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:15:51 - __main__ - INFO - 2 bytes 1/1 messages received 2 bytes received
2025-03-04 17:15:51 - __main__ - INFO - 3 3
2025-03-04 17:15:51 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:15:51 - __main__ - INFO - 3 bytes 1/1 messages received 3 bytes received
2025-03-04 17:15:51 - __main__ - INFO - 4 4
2025-03-04 17:15:51 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:15:52 - __main__ - INFO - 4 bytes 1/1 messages received 4 bytes received
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2025-03-04 17:15:52 - __main__ - INFO - ABB COM detected COM9
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2025-03-04 17:15:53 - __main__ - INFO - ABB COM detected COM9
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2025-03-04 17:16:07 - __main__ - INFO - 65 bytes 1/1 messages received 65 bytes received
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2025-03-04 17:16:07 - __main__ - INFO - 66 bytes 1/1 messages received 66 bytes received
2025-03-04 17:16:07 - __main__ - INFO - 67 67
2025-03-04 17:16:07 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:16:09 - __main__ - INFO - 67 bytes 0/1 messages received 0 bytes received
2025-03-04 17:16:09 - __main__ - INFO - Failed on 1st message :
2025-03-04 17:16:09 - __main__ - INFO - Send :b'hello welcome111111111111111111111hello welcome11111111111111111111'
2025-03-04 17:16:09 - __main__ - INFO - Received:b''

Please help us in resolving this.

Thanks

Nithin

  • 0
    TI__Genius 16492 points

    Hi Nithin,

    Fullscreen usb_loop_test_run.bat Download 
    @echo off

set /a count=0

:loop
set /a count+=1
echo The test times: %count%

timeout /t 1 /nobreak >nul

python USB_test.py

if %count% lss 1000 goto loop
    Fullscreen USB_test.py Download 
    import serial
import serial.tools.list_ports

# list all the ports
ports = serial.tools.list_ports.comports()

# enumerate all the ports
for port in sorted(ports):
    #print(f"Port: {port}, Desc: {desc}, HWID: {hwid}")
    if "USB" in port.description:
       print(f"Found USB device on port: {port.device}")
       usb_port = port.device
    

port = usb_port 
baudrate = 115200  
timeout = 2  # unit：s


data_to_send = [0xF8, 0x03, 0x01, 0x02, 0x00, 0x02, 0x70, 0x5E]
data_to_send_hex = ' '.join(f'{byte:02X}' for byte in data_to_send)
print(f"USB Sent data: {data_to_send_hex}, over port: {port}")

try:
    
    # open the port
    ser = serial.Serial(port, baudrate, timeout=timeout)
    
    # send the data
    ser.write(data_to_send)

    # receive the data
    received_data = ser.read(20) 

    # close the data
    ser.close()

    # print the received data
    received_data_hex = ' '.join(f'{byte:02X}' for byte in received_data)
    print(f"USB Received data: {received_data_hex}, over port: {port}")

except serial.SerialException as e:
    print(f"Error: {e}")

    As discussed over call, sharing the steps here,

    1. Rebuilding USB libraries without optimizations

    1.1 In the makefile located at "C:\ti\mcu_plus_sdk_am261x_10_00_01_10\source\usb\tinyusb\makefile.cdc_nortos.am261x.r5f.ti-arm-clang", remove the Optimization flag "-Os" from the CFLAGS_release list.

    1.2  In the makefile located at "C:\ti\mcu_plus_sdk_am261x_10_00_01_10\source\usb\synp\makefile.nortos.am261x.r5f.ti-arm-clang", remove the Optimization flag "-Os" from the CFLAGS_release list. 

    1.3 Rebuild both the libraries using the below commands (run from mcu_plus_sdk folder)

    # Tiny USB Stack clean and re-build
gmake -sj -f makefile.am261x usbd_tusb_cdc_nortos_r5f.ti-arm-clang_clean
gmake -sj -f makefile.am261x usbd_tusb_cdc_nortos_r5f.ti-arm-clang

## USB Driver clean and re-build
gmake -sj -f makefile.am261x usbd_synp_nortos_r5f.ti-arm-clang_clean
gmake -sj -f makefile.am261x usbd_synp_nortos_r5f.ti-arm-clang


    2. Rebuilding application

    Rebuild your USB CDC application to link these new libs .

    3. Testing application using scripts

    I have attached 2 scripts (1 python script which sends data to COM Port and reads back the data from same port), You can modify this script for two ports if you wish, as well as a bat file to run the python script multiple times (default is 1000). You can run the .bat file after you have the COM Ports enumerated in the application. I guess this is similar to the test script you are using as well. (I tested with 1000 iterations and it worked fine).

    Note: We discovered that the "R355" Resistor was causing some issues on AM261x-LP Boards. It is DNI by default but was causing some interference in USB Signals and enumeration was failing. I request you unmount the "R355" Completely from your board to rule out this issue as well. (https://www.ti.com/lit/ug/sprujf1/sprujf1.pdf?ts=1741330918195&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FAM2612)

    If the above steps don't resolve your issue, please let me know, we can look further at other endpoint related stuff in the driver for debugging.

    Regards,
    Shaunak