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MK22FN512 USB Composite device Audio + CDC, microphone don't work in audio device...

Question asked by Evgeniy Ivanov on Jan 28, 2019
Latest reply on Jan 31, 2019 by Jing Pan

I am using SDK 2.5.0. Based on the example, I created a USB stack for a composite device AUDIO(speaker + microphone) + CDC(Vcom). For the basis, I took the example of usb_device_composite_hid_audio_unified_lite and replaced it HID on CDC. At first worked only CDC Virtual COM. I added IAD descriptor for Audio class. After that, the speaker began to work, but the microphone did not...    Audio in conjunction with HID or MSC works fully.

What could be the reason?