If you dig deep enough, you eventually get down to
tos/system/ArbiterP.nc which implements the Resource interface:
async command error_t Resource.release[uint8_t id]() {
atomic {
if(state == RES_BUSY && resId == id) {
if(call Queue.isEmpty() == FALSE) {
reqResId = call Queue.dequeue();
state = RES_GRANTING;
post grantedTask();
}
else {
resId = default_owner_id;
state = RES_CONTROLLED;
signal ResourceDefaultOwner.granted();
}
call ResourceConfigure.unconfigure[id]();
}
}
return FAIL;
}
So basically... it always return FAIL, which I think is a bug.
Michiel
From: [email protected]
[mailto:[email protected]] On Behalf Of Shaun
Lawrence
Sent: vrijdag 19 december 2008 21:02
To: [email protected]
Subject: Re: [Tinyos-help] SPI Resource Help
Ok I figured out that the release is happening but for some reason it's
returning FAIL instead of SUCCESS. Since I am not the owner initially
the request is handled and granted and after the release led1 is toggled
showing that I am no longer the owner. If I comment out "call
SpiResource.release();" then led2 is toggled. So everything is expected
but for some odd reason the .release() is not returning what I thought.
Anyone know what might cause this? I am running the telosB.. this
request is happening on Msp430Spi1.
Here is the code I am using:
task void release()
{
call SpiResource.release();
if (!call SpiResource.isOwner())
call Leds.led1Toggle();
else
call Leds.led2Toggle();
}
event void SpiResource.granted()
{
post release();
}
async command error_t Spi.convert()
{
if (!call SpiResource.isOwner())
call SpiResource.request();
return SUCCESS;
}
From: [email protected]
[mailto:[email protected]] On Behalf Of Shaun
Lawrence
Sent: Friday, December 19, 2008 8:10 AM
To: [email protected]
Subject: [Tinyos-help] SPI Resource Help
I'm having a little trouble with the SPI Resources, I need to setup
arbitration but that will come later. Just need to make sure I can get
the following to work first.
First I want to say that only one device is on the SPI bus, the one I'm
trying to control. So the problem isn't that something else already has
control.
I call SpiResource.request() and in turn the SpiResource.granted() is
called like its suppose to, I have already verified this.
However, when I try to call SpiResource.release() it's coming back as
FAIL but I have verified that the SpiResource.isOwner() is coming back
as TRUE. Does anyone know why the release() is failing?
Thanks in Advance.
-Shaun
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