RE: nRF5340 UAC2: can isochronous IN endpoint use full 1023-byte buffer

Amanda Hsieh — Wed, 13 May 2026 19:13:06 GMT

Unfortunately, it could not avoid modifying the current SDK to achieve your requirement, but you could pull a request on https://github.com/zephyrproject-rtos/zephyr to submit the changes. It will be merged into the future release if it gets approval.

RE: nRF5340 UAC2: can isochronous IN endpoint use full 1023-byte buffer

Elliot Metcalf — Wed, 13 May 2026 17:33:48 GMT

I was able to get a working solution by changing a few lines in the SDK file:
//NRF_USBD->ISOSPLIT = USBD_ISOSPLIT_SPLIT_HalfIN << USBD_ISOSPLIT_SPLIT_Pos;
 NRF_USBD->ISOSPLIT = USBD_ISOSPLIT_SPLIT_OneDir << USBD_ISOSPLIT_SPLIT_Pos;
and 
ep_cfg_in[i].caps.mps = NRF_USBD_COMMON_ISOSIZE; // / 2;
is there a way to do this without modifying the SDK?