How to enable the USB ISO transfer on KL26 MCU?

2743294708 — Sat, 24 Nov 2018 12:34:13 GMT

I have crated a project of USB audio, and confued by a question.

The question is that the USB device can't receive the ISO data, while the control transfer works well.

Further debug, it is found that the deivce doesn't generate the interrupt(within the funtion 'USB_DeviceKhciInterruptTokenDone()') while the host send out the ISO data.

Would you show me the key design point about how to perform the ISO function? Such as:

1. check whether the usb config descriptor is correctly;

2. check whether the USB interrupt is enabled;

3. check whether the endpoint TX and RX interrupt enabled;

4. check whether the endpoint BDT is set correctly;

My project code is written based on the demo "FRDM-KL26Z_KEIL\usb_device_composite_hid_audio_lite".

Thanks.

Re: How to enable the USB ISO transfer on KL26 MCU?

2743294708 — Sun, 25 Nov 2018 03:20:42 GMT

Question resolved.

The reason is that the ISO endpoint is not initialized correctly.

The OWN bit of the ISO endpoint's BD should be set '1'. If not, the USB SIE can't update BD, and can't set the TOK_DNE interrut.

Thanks.

Kinetis Microcontrollers中的主题 How to enable the USB ISO transfer on KL26 MCU?

How to enable the USB ISO transfer on KL26 MCU?

Re: How to enable the USB ISO transfer on KL26 MCU?