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On Am33xx I am using a bluetooth adapter over musb host using cppi41.I'm doing some Bluetooth Audio using a USB adapter. It using RFCOMM and SCO (the former uses bulk transfer the latter uses isochronous transfers), i am missing a packet in a bulk transfer after the isochronous transfer stopped.This seems to happens during or even after isochronous packet was received, i can receive still data from the bluetooth adapter, but the first send does not seem to happen, even though I am seeing the tx complete. I mean, I am expecting a response from the adapter that I do not see. So I guess that the adapter did not receive the message. I also tried different adapters to rule out.I have a very simple code that can reproduce the issue on 1/3 rate.
I noticed that If I don't establish the audio connection, there is no packet loss.
The kernel on this device is 4.9 kernel with lkml.org/.../1167
Is this a known issue?
Any suggestion would be welcome, thanks,
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Thanks and Regards,
Link: PathPartner Technology
In reply to Pavel Botev:
Thanks for your response.
We use a custom board derived from the beagle bone black.
Regarding the kernel, i don't think it is the TI SDK, we have 4.9.30 with many patches.
In reply to Dwarakesh R:
In reply to user5131608:
Hi Pavel and Dwarakesh,
I have installed the SDK with a beaglebone black and the issue reproduced. The bbb kernel is 4.4.9-ti-r25.
About our kernel, I was told it was "very similar" to yours but not equal.
I have more informations that could be useful:
The adapter I used (let's call it a0) integrates a HUB. I realized that the issue did not occur at all using an adapter that did not use integrated HUB (a1).
If the adapter a1 is plugged on a external HUB, the issue starts occuring.
I tried to lower to full-speed rather than high-speed, and it didn't help.
user5131608I have installed the SDK with a beaglebone black and the issue reproduced. The bbb kernel is 4.4.9-ti-r25.
Which SDK you have installed? Have you tried with AM335x PSDK 4.01 (kernel 4.9.41)?
This is the SDK as it is installed on my computer: ti-processor-sdk-linux-am335x-evm-04.01.00.06 I used create-sdcard.sh to create sdcard, then apt update/upgrade.
It doesn't seem to contain the kernel you mention, how can I test it?
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