Michael,
Thank you for your response. In keeping with the topic of our original
conversation, I am still trying to implement the ReadStream interface to
sample the MicaZ accelerometer.
After sampling at the prescaler setting that guarantees full precision
(which is ATM128_ADC_PRESCALE_64 for the MicaZ, according to my
calculations) and reading up on the SoundLocalizer application in the
TinyOS Programming Manual, I was wondering if there was any way to alter
the prescaler and use ReadStream (necessary, in my opinion, because I want
to append samples to the log as they are obtained and ReadStream provides
this facility).
The plethora of ADC configuration interfaces makes it confusing for a
TinyOS 2.x and programming novice such as myself to figure out where the
prescaler is altered but I think that I've managed to figure out how this
can be done. What I am having a lot more trouble doing is figuring out how
the ReadStream interface configures the ADC. There must be a point at which
the ReadStream interface specifies what prescaler it wants to use, right?
This led me to search for a module for the ReadStream interface but I have
had no luck.
So,
- Is there a module for the ReadStream interface where the prescaler etc
is set?
- Is it possible to modify the prescaler for ReadStream at all or is it
perpetually set to ATM128_ADC_PRESCALE?
- Is it a good idea to try to mimic the ReadStream operation by using
something like Atm128AdcSingle.getData (like the SoundLocalizer does) and
then trying to store each sample in a buffer, which would then be appended
to the log? My opinion is that this will result in a lot of processing
overheads (and make it really tough to program, but I don't see just that
being a problem).
I apologize for the lengthy post.
Kushal
On Mon, Nov 14, 2011 at 12:04 PM, Michael Schippling <sc...@santafe.edu>wrote:
> Changing the return value will have no effect on the ADC.
> There used to be an interface for this that was actually
> documented in the code:
> ADCControl.setSamplingRate(**uint8_t rate);
> The name may have changed to setPrescaler() or something
> more obvious.
>
> MS
>
>
> Kushal Sarkara wrote:
>
>> Hello,
>>
>> I am using TinyOS 2.1.1 on Ubuntu 9.10 with MicaZ motes. I am looking to
>> alter the value of the prescaler while sampling the X axis of the
>> accelerometer on the mts300 sensorboard.
>>
>> After doing some digging, I found the file
>> /tos/sensorboards/mts300/**AccelP.nc
>> which returns the value of the prescaler for configuring the Adc, the
>> getdata() function for which leads me back to the /tos/chips/atm128/adc/*
>> *Atm128AdcP.nc file.
>>
>> The code in the AccelP.nc file that I am referring to is as follows:
>> /
>> /
>> / async command uint8_t ConfigX.getPrescaler() {/
>> / return ATM128_ADC_PRESCALE;/
>> / }/
>> /
>> /
>> Will it suffice to change the returned value to, for example,
>> /ATM128_ADC_PRESCALE_32 (/as provided in the
>> /tos/chips/atm128/adc/**Atm128Adc.h)
>> if I want to use the adc prescaler (32)?
>>
>> Thanks in advance,
>> Kushal
>>
>>
>> ------------------------------**------------------------------**
>> ------------
>>
>> ______________________________**_________________
>> Tinyos-help mailing list
>> Tinyos-help@millennium.**berkeley.edu<Tinyos-help@millennium.berkeley.edu>
>> https://www.millennium.**berkeley.edu/cgi-bin/mailman/**
>> listinfo/tinyos-help<https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help>
>>
>
_______________________________________________
Tinyos-help mailing list
Tinyos-help@millennium.berkeley.edu
https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
