[166] USBD: ISO double buffering not functional

Symptoms

The double buffering of the ISO EPs of the USBD is not functional.

Conditions

Always. With default settings, the buffers overlap.

Consequences

During ISO transition, received or transmitted data is likely to be corrupted.

Workaround

*((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7E3;
*((volatile uint32_t *)(NRF_USBD_BASE + 0x804)) = 0x40;