usb audio mic send data

[Nordic DevZone]

hi ,

I'm testing this example     sdk17.1\examples\peripheral\usbd_audio\pca10056\blank\arm5_no_packs.

I tested the microphone and the headphone separately.

For microphone devices, I found that data could only be sent successfully if the recorder on the computer side was turned on .If the recorder on the PC side is not turned on and the USB microphone is not used, the data on the 52840 chip will fail to be sent.

If the local end of the chip can know when the microphone is turned on, then I can control the transmission of this data.

But my test code did not find such an event, what should I do, how do I know if the USB microphone is on or off.

I used DK PCA10056, SDK17.1.

Thanks.

[ovrebekk]

Hi 

I tested the sample myself and came to the same conclusion. It doesn't seem like any event is forwarded to the application when recording is enabled on the host side, the only difference is whether or not you receive the INVALID_STATE error (8) when trying to send microphone data. 

I will check with the USB developer if he has some input on this, but possibly this was an oversight on the driver side. 

A possible workaround is to attempt to send microphone data at regular intervals using an app_timer callback, and open up for continuous transmission once you don't get the INVALID_STATE error. 

Best regards
Torbjørn

[ovrebekk]

Hi again

The USB developer didn't have any more input on this unfortunately. Were you able to find a workaround?

For future projects I would recommend having a look at the nRF Connect SDK rather than then nRF5 SDK. The nRF5 SDK is more or less deprecated at this point, and any new features or improvements will be added to the nRF Connect SDK. 

Best regards
Torbjørn

[Judge]

Hi Torbjørn,

Thank you for your advice. I don't have a better way. I just use the method you mentioned before. I will try my best to use NCS in future new projects.

Thanks.

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[ovrebekk]

Hi 

Thanks for the update. Then I will consider this case resolved

Best regards
Torbjørn