Set time stamp in Audio file davinci-mcasp.c.

Hinesh Gohel

Hello TI,

I wanted to Have time stamp in Audio driver of McASP. How do I Give Time stamp this Driver that I can read from Application layer.

Need Suggestion regarding This Issue.

Thanks,

Hinesh

over 10 years ago

0 Pavel Botev over 10 years ago

TI__Guru**** 170625 points

Hi Hinesh,

I can provide you the below pointers regarding timestamp:

processors.wiki.ti.com/.../Optimize_Linux_Boot_Time
processors.wiki.ti.com/.../Measuring_Boot_Time
processors.wiki.ti.com/.../Sitara_Linux_Training:_Boot_Time_Reduction_Update
processors.wiki.ti.com/.../Iperf

e2e.ti.com/.../1301503
e2e.ti.com/.../29508

BR
Pavel

0 Hinesh Gohel over 10 years ago in reply to Pavel Botev

Expert 1360 points

Hi Pavel,

I appreciate Fast Reply and The suggestions. I have also Went through links but I am not able to find the answer.

Let me clear my question. In main Audio source in "ezsdk_dm814x-evm_5_05_01_04" I want time stamps.

I am using ALSA for audio capture And Wanted time stamps on every Audio frame.

Need Guidance In this matter.

Thanks,

Hinesh.

0 Pavel Botev over 10 years ago in reply to Hinesh Gohel

TI__Guru**** 170625 points

Hinesh,

I would suggest you to check this with the ALSA project community.

http://www.alsa-project.org

BR
Pavel

0 Hinesh Gohel over 10 years ago in reply to Pavel Botev

Expert 1360 points

Hi Pavel,

Thanks for your Reply
I have some other issues that I am facing now.

I am having DM81xx Processor . In That I am using ALSA driver for sound ( V 1.0.23 ) .While I was running my application at 32k , After some time I am getting Error. So When I checked on graph, after some time ( time varies from 0.5 to 1.5 Hr) I am getting sample Drop. And that point,linear Sound Graph went Down Directly. I am doubting it's buffer problem. And some times I am getting samples from 0-32k instantly.

Running the audio data transfer with a different asp_chan_q ,(EVENTQ_1 vs EVENTQ_2) makes no difference.

it will be really helpful if anyone can solve the issue soon as it is a high priority task and critical to solve the issue.

Thanks,
Hinesh

0 Pavel Botev over 10 years ago in reply to Hinesh Gohel

TI__Guru**** 170625 points

Hinesh,

Which version of the DM814x linux kernel you are using? Can you try with the latest code base, available at the below link:
http://arago-project.org/git/projects/?p=linux-omap3.git;a=shortlog;h=refs/heads/ti81xx-master

See also if the below wiki pages will be in help:
processors.wiki.ti.com/.../TI81XX_PSP_AUDIO_Driver_User_Guide
processors.wiki.ti.com/.../TI81XX_PSP_04.04.00.02_Feature_Performance_Guide
processors.wiki.ti.com/.../TI81XX_PSP_04.04.00.02_Release_Notes

processors.wiki.ti.com/.../Sitara_Linux_Audio_Sample_Application_Overview
processors.wiki.ti.com/.../Processor_SDK_Linux_Audio
processors.wiki.ti.com/.../Linux_Core_Audio_User%27s_Guide

BR
Pavel

0 Hinesh Gohel over 10 years ago in reply to Pavel Botev

Expert 1360 points

Hi Pavel,

Thank you for Reply.

I am using Kernel Version 2.6.37 and the ALSA audio driver is 1.0.23.

I have also looked on links above. But the issue still not resolved.

Thanks,
Hinesh

0 Pavel Botev over 10 years ago in reply to Hinesh Gohel

TI__Guru**** 170625 points

Hinesh,

Can you try to reproduce this issue on the DM814x TI EVM? Do you have the same problem there?

BR
Pavel

0 Hinesh Gohel over 10 years ago in reply to Pavel Botev

Expert 1360 points

Hi Pavel,

Thank you for the Reply.

I have Replaced the ALSA Driver version with new version Compatible with Kernel (1.0.25) , and Issue is Resolved.

I also Wanted to know that, Is there any way that we can have timestamps available for each frame from H/W leval (I2S or McASP Layer) .?

Thanks,

Hinesh

0 Pavel Botev over 10 years ago in reply to Hinesh Gohel

TI__Guru**** 170625 points

Hinesh Gohel said:
I have Replaced the ALSA Driver version with new version Compatible with Kernel (1.0.25) , and Issue is Resolved.

Thanks for the update. You also might find the below e2e thread interesting, as it is related to that:

Hinesh Gohel said:
I also Wanted to know that, Is there any way that we can have timestamps available for each frame from H/W leval (I2S or McASP Layer) .?

HW timestamp is available only for DM814x EMAC module. There is no HW timestamp support for DM814x McASP module.

BR
Pavel

0 Hinesh Gohel over 10 years ago in reply to Pavel Botev

Expert 1360 points

Hi Pavel,

Thanks,

I wanted to know that Is it possible to access each audio frame individually between EDMA read from the McASP and before EDMA put that data to Destination address ?

Can we do that??

Thanks,
Hinesh

0 Hinesh Gohel over 10 years ago in reply to Hinesh Gohel

Expert 1360 points

Hi Pavel Botev

Is there any update on the above query..??

Please update me .

Thanks,
Hinesh Gohel

0 Pavel Botev over 10 years ago in reply to Hinesh Gohel

TI__Guru**** 170625 points

Hinesh Gohel said:
I wanted to know that Is it possible to access each audio frame individually between EDMA read from the McASP and before EDMA put that data to Destination address ?

Can we do that??

In my opinion, you can not do that. EDMA controller is HW mechanism to offload the data transfer from the host CPU (Cortex-A8 or DSP). The host CPU does not have option to access the data transferred from the EDMA in the middle of this EDMA transfer. The host CPU can access this data, after the transfer complete and EDMA notify the host CPU that this transfer is completed.

You can refer to DM814x TRM, chapters 8 EDMA (sections 8.4.4.1 Non-bursting Peripherals, 8.4.4.3 Continuous Operation) and 16 McASP.

BR
Pavel

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Set time stamp in Audio file davinci-mcasp.c.