ACK/NACK/NYET on K61 HS USB

[sroy1128]

I am working with HS USB on K61 in device mode and Windows PC the host. Does the software/driver have to respond to the PING requests from the host? How does the ACK/NACK/NYET works? Does the software send them?

[miduo]

Hi,

Yes, an endpoint automatically NAKs when it has no data waiting to be sent (in its BD).  See more detail here:https://community.nxp.com/message/927825 

[miduo]

Hi,

Please let me know what USB software & driver you mentioned?

[sroy1128]

Thank you so much for your response. My question was whether controller issues ACK/NACK/NYET. Are PING packets from the Host handled by the controller?  If so what are the possible reasons for a NACK response for a PING packet? Thank you.