Hi
I am using MultiChannel sampling on the msp430 ADC as shown in
tinyos-2.x/apps/tests/msp430/Adc12. When I run the program, it runs correctly
for a non-deterministic length of time (sometimes minutes, sometimes a day) and
then appears to be stuck. Debugging with LEDs and UART shows that the timer for
sampling continues to fire, but the Resource.reserve call returns an EBUSY
error type after this time and no more granted events are signalled.
Also, there's no other ADC client in my application. I only use the timer, UART
and this ADC getData call. The MultiChannel interface is wired to the
Msp430Adc12ClientAutoRVGC component. I've seen this happen for sampling rates
of 1kHz down to 167 Hz, but haven't tested for lower sampling rates.
The code I am using looks like this
event Timer.fired(){ // this fires every 6ms
result = call Resource.request(); // returns SUCCESS upto some
non-deterministic time, during which Resource is granted and I can read ADC
correctly, after which always returns EBUSY, no more Resource.granted events
are signalled
}
task void releaseResource(){
call Resource.release();
}
task void processData(){
.. send samples to UART
}
event Resource.granted(){
if (MultiChannel.configure(&config, &memCtl, 1, buffer, BUFFER_SIZE, 0) ==
SUCCESS)
if (call MultiChannel.getData() != SUCCESS)
post releaseResource();
else
post releaseResource();
}
event MultiChannel.dataReady(bufptr){
call Resource.release();
...make local copy;
post processData();
}
If anyone has observed this or notices something I'm doing wrong, please let me
know.
Thank you
Sandip
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