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
2025-03-04 17:15:52 - __main__ - INFO - 5 bytes 1/1 messages received 5 bytes received
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2025-03-04 17:15:52 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:15:52 - __main__ - INFO - 6 bytes 1/1 messages received 6 bytes received
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2025-03-04 17:15:52 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:15:52 - __main__ - INFO - 7 bytes 1/1 messages received 7 bytes received
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2025-03-04 17:15:52 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:15:53 - __main__ - INFO - 8 bytes 1/1 messages received 8 bytes received
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2025-03-04 17:15:53 - __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 17:15:54 - __main__ - INFO - ABB COM detected COM9
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2025-03-04 17:16:06 - __main__ - INFO - 65 65
2025-03-04 17:16:06 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:16:07 - __main__ - INFO - 65 bytes 1/1 messages received 65 bytes received
2025-03-04 17:16:07 - __main__ - INFO - 66 66
2025-03-04 17:16:07 - __main__ - INFO - ABB COM detected COM9
2025-03-04 17:16:07 - __main__ - INFO - 66 bytes 1/1 messages received 66 bytes received
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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