Hi
I had asked this on comm-dev-forum and got no answer.
Then I asked Palm Developer Support, where I got a nice reference
number but no answer (after more than 3 weeks)
So I'm asking on this forum now, sorry for the inconvenience & this
will be the last time before I decide to change and sell pizzas or
whatever... :)
I would appreciate it if someone could at least point me in the right
direction. (I have read everything I could find, including the Palm
docs and the stuff at irda.org)
==========
So the question is : when using a TinyTP connection, when should
IrAdvanceCredit be called ?
This is totally unclear in the docs.
There's a PowerPoint presentation by Bruce Thompson floating around on
the net, saying that :
- the receiver advances credit to the sender
- IrAdvanceCredit should be called "when buffers become available"
- sending packets consumes credit
Ok, but:
1) when do "buffers become available"? Are these buffers my app's, or
are they internal IR stack buffers? If the latter, how do I know about
their becoming available?
2) The presentation by Bruce Thompson definitely says IrAdvanceCredit
SHOULD be called. But it does not say exactly when:
-do I call it upon sending data ? After or before sending ?
-do I call it on Packet Handled ?
-do I call it upon receiving data ?
3) The credit tells the remote how much packets it can send.
This corresponds to some space I have available for receiving on the
Palm. Who manages this space ? If the IR stack, how do I know how much
space it has ?
4) What are reasonable values for credit?
The doc states that credit should not exceed 127. Is the credit
cumulated every time I call IrAdvanceCredit ? How do I know how much
credit there currently is, so I can be sure not to exceed 127?
5) IrAdvanceCredit is a macro that simply increments availCredit in
the IrConnect structure. Therefore, it cannot really advance the
credit to the remote, as this requires sending a packet over the IR
link.
I have observed this:
-call IrAdvanceCredit
-note that availCredit has been incremented
-give control back to the system
-note that availCredit is now 0 ??
Does that mean that the system polls availCredit and sends an IR
packet behind the scenes when I change it ?
Thanks
Fred
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