Hi Pierre-Louis, Thank you for your quick response. Shall I know what does the below error mean? aplay: pcm_write:1940: write error: Input/output error On Fri, Dec 6, 2019 at 9:21 PM Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> wrote: > > > > On 12/5/19 11:22 PM, Mohan Prasath Ramamoorthy wrote: > > Dear All, > > > > We are working on external modules of microphone and speaker and we > > are using the kernel version 3.10.96 > > wow, that is one ancient kernel EOL'ed in 2017... > > > > > We are recording with commands like arecord and aplay for recording > > and playback respectively. > > > > While doing the below experiments we could able to observe an issue as below, > > > > 1. With only recording and not playback we haven't faced any issues. > > 2. With only playback and not recording we haven't faced any issues. > > > > 3. By starting an infinite recording in the background and by doing a > > playback of the audio file(30seconds, the sampling rate of 22050, the > > channel is stereo), after some iterations, we are facing a below error > > and we could not able to listen to the audio. > > > > Error: aplay: pcm_write:1940: write error: Input/output error > > > > Below are the respective commands for recording and playback, > > > > 1. arecord -D hw:0,0 -c 2 -f s16_le -r 8000 /home/ubuntu/mic_testing.wav & > > 2. aplay -D hw:0,3 audio_22k_c2.wav > > > > But when the issues come, we just stopped recording and restarted the > > recording in the background. After this, the playback is working fine. > > > > Also, during the issue came, we have checked for the below properties, > > > > 1. I2S has been enabled. Checked under the file: > > /sys/kernel/debug/clock/clock_tree > > 2. Driver callbacks have been called. (Checked with the kernel logs[dmesg]) > > > > We would like to know the reason behind this error.? > > Sounds typical of an interference between the playback and record > programming flows, e.g. when changing a shared register. Not all I2S > tolerate dynamic changes from RX or TX only to full-duplex. -- With Best Regards, Mohan Prasath VVDN Technologies Pvt Ltd Cell: +91 9629768919 Web: www.vvdntech.com -- _Disclaimer: _© 2019 VVDN Technologies Pvt. Ltd. This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful._ _ _ _ __ _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
