topic Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard in LPC Microcontrollers

Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

sergey_shidlovs — Sat, 08 Aug 2020 08:24:59 GMT

Hi!

I'm having trouble with the app mentioned in the topic.

I need to make a project based on a USB audio device. I have decided to base it on the SDK example.

When I build and load the app on the board (LPC55S69), Windows shows a new audio device, but it can't be used as output. In the device properties, there's status "The device can't start (Code 10)". I didn't make any additional changes in the code so far.

Any ideas what can be wrong with it?

Thanks in advance for helping.

Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

jc — Mon, 10 Aug 2020 21:55:08 GMT

In file "usb_device_config.h" change:

from

#define USB_DEVICE_CONFIG_AUDIO_CLASS_2_0 (1U)

#define USB_DEVICE_CONFIG_AUDIO_CLASS_2_0 (0U)

Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

ZhangJennie — Tue, 11 Aug 2020 09:37:23 GMT

I tested the default demo code lpcxpresso55s69_dev_audio_speaker_bm with MCUXpresso v11.1.1. there is no issue.

after download the code. restart, USB AUDIO DEMO can be recognized by windows as below

Have a great day,
Jun Zhang

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Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

sergey_shidlovs — Tue, 11 Aug 2020 10:34:26 GMT

Hi, Jaroslaw!

Thank you for the reply, will be able to check this as soon as I resolve a flashing issue with my development board.

Best regards,

Sergii

Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

sergey_shidlovs — Tue, 11 Aug 2020 10:35:44 GMT

Hi, Zhang!

Thanks, will give it a try.

Best regards,

Sergii

Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

jc — Tue, 11 Aug 2020 21:21:42 GMT

The problem exists when:

- SDK Version 2.8.0 is used ( Enabled the audio2.0 defaultly for device audio demos.)
and

- PC (Host side) use system version (Win7 for example) that don't have native support for USB Audio 2.0

Regards
Jarek

Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

ZhangJennie — Wed, 12 Aug 2020 08:24:43 GMT

Which MCUXpresso IDE version do yo work with?

SDK2.8 was compiled and tested with MCUXpresso IDE v11.2.0. it's not for IDE v11.1.x.

Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

sergey_shidlovs — Wed, 12 Aug 2020 09:13:14 GMT

I don't use an IDE, just compiling and uploading from the command line.

Re: Can't start usb_device_audio_speaker example for LPC55S69 MCU devboard

ZhangJennie — Mon, 07 Sep 2020 08:05:52 GMT

On windows 10, enable demo code macro

USB_DEVICE_WORKAROUND_AUDIO_20_WINDOWS

can fix this issue.

this is documented in readme file of this demo project folder.

Best Regards

Jun Zhang