The documentation for the OSR USB FX2 learning kit indicates that
Endpoint 1 - Interrupt Endpoint Packet Format
“The switch pack value is sent on startup, resume from suspend, and
whenever the switch pack setting changes.”
I monitor the USB packets and sniffer does NOT pick up any USB packets
being sent when I change the switch back??? Has anyone else seen
this and why is it happening?
Merritt, Julia wrote:
The documentation for the OSR USB FX2 learning kit indicates that
Endpoint 1 - Interrupt Endpoint Packet Format“The switch pack value is sent on startup, resume from suspend, and
whenever the switch pack setting changes.”I monitor the USB packets and sniffer does NOT pick up any USB packets
being sent when I change the switch back??? Has anyone else seen
this and why is it happening?
Are you running the application to read from the endpoint? Remember
what I told you – a USB device cannot send ANYTHING on its own. It
will only send data when the host asks it to send, and that will only
happen if a driver sends a read request.
The switch pack value is being queued up in the device, ready for you to
read, but it won’t be sent until you read it.
–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.