PORTS Forum

Ports and Interfaces => USB => Topic started by: ulao on July 25, 2018, 08:23:22 am

Title: Send multiple naks or just once?
Post by: ulao on July 25, 2018, 08:23:22 am

I was wondering if sending a NAK to the host tells it, I'm busy until the the device sends ACK. In other does a device typical keep sending NAK, NAK, NAK, NAK, NAK, NAK, ACK... or NAK, .....................ACK.

Title: Re: Send multiple naks or just once?
Post by: Jan Axelson on July 25, 2018, 09:27:58 am

Endpoints can only respond to communications from the host and must return NAK (or NYET) in repsonse to IN or OUT token packets until they have data ready to send or are able to receive new data.