Kinetis Microcontrollers中的主题 ACK/NACK/NYET on K61 HS USB

ACK/NACK/NYET on K61 HS USB

sroy1128 — Thu, 01 Mar 2018 00:34:53 GMT

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?

Re: ACK/NACK/NYET on K61 HS USB

miduo — Fri, 02 Mar 2018 02:57:18 GMT

Hi,

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

Re: ACK/NACK/NYET on K61 HS USB

sroy1128 — Fri, 02 Mar 2018 18:53:31 GMT

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.

Re: ACK/NACK/NYET on K61 HS USB

miduo — Thu, 21 Jun 2018 08:43:12 GMT

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