Murat Ursavaş

> My observation is, the frame is detected but it is giving a "WouldBlock" error. This is simply incorrect because I was assuming RX was creating USBCTRL_IRQ. Actually it just...

I think I've found the root cause. Before the first frame, the `LENGTH_0` data under `EP1_OUT_BUFFER_CONTROL` register is zero. That is creating issues. It's implicitly set to 0x40 while trying...

I've finally revealed the culprit. It's happening on rp2040_hal. I'll try to fix the issue and leave a note at here.

Now I'm able to receive the first frame without any issues. You can find my patch here: https://github.com/rp-rs/rp-hal/pull/510 It should be available after `rp2040_hal` 0.6.2.

I think this issue can be closed since my fix has been approved and will be available shortly.