Varying USB Latency

[waynepauly]

Paul,

You are correct, the pc seems slow to respond sometimes at it's own whim, same as you experienced with your pic-scope. You mentioned interrupt or asyncronous transfers as a solution; do you know how to modify the easy-HID template to do them, or do you have to start over with a different approach?

Wayne

[locko]

Wayne,

I'm affraid not, I have been trying to modify the core assembler files and come up with PBP code to handle interrupt transfers for an outstanding project of mine but without any luck. No ones else on here seems to have a solution either so it looks like were on our own. I'm about to start packing my stuff up for a move back to the States so wont be able to work on this for a while.
You may have to look into something like Jungo, but your looking at $$.

I will be keeping an eye out on the internet for an answer and if I find something, Ill give you a shout.

Paul

[falingtrea]

The only way you can be guaranteed low latency is to establish an isochronous connection. The USB bus is assigned bandwidth on a first come first served basis, with the exception of isochronous connections, which receive guaranteed bandwidth if possible.