USBD bulk endpoint

[alexlöddeköpinge]

Hi everyone,

I put below the link of a previous discussion. I refer to the main.c present in the discussion. I have a question about it.

In the main.c in the discussion below, the bInterfaceSubClass is defined at line 169. In particular, the MSC class is defined which has a bulk IN endpoint and a bulk OUT endpoint.

Now we come to my question. Is it possible to replace the OUT endpoint with another IN endpoint. If I do, does it create a conflict with the bInterfaceSubClass?

https://devzone.nordicsemi.com/f/nordic-q-a/42119/usb-speed-issue-on-nrf52840

Thanks

BR

[Turbo J]

alexlöddeköpinge said:

 Is it possible to replace the OUT endpoint with another IN endpoint

No, that won't work with the MSC class - USB mass storage uses both endpoints to communicate with the host.

What are you actually trying to achieve?

[alexlöddeköpinge]

I want to use two bulk endpoint in to send data from ADC to PC. 

But could I create an MSC + MSC composite device so that I have 2  IN BULK endpoints?

Thanks for your answer

[Turbo J]

You can have two bulk in endpoints, but then you would not use MSC.

Instead you could use WinUSB or one of the wrapper Libs (LibUSB, LibUSBK) which can use WinUSB as driver. A bit more difficult to set up, but works better than COM ports.