eptri: add a 'nak' register to 'InFIFOInterface' to allow querying endpoint nak statuses #6
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…dpoint nak statuses
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Previously Moondancer simply polled all configured IN endpoints for pending transfer requests.
This commit adds a new read-only register 'nak' to the
InFIFOInterfacethat maintains a bitmask containing all endpoints that have responded to an incoming data request withNAK.This eliminates errors caused by Moondancer polling an IN endpoint that did not contain a pending transfer request.