Re: [Tinyos-help] Z1 High speed i2c accelerometer sampling

2013-04-17 Thread Antonio Linan 
Hello again,

Using the TestADXL345 example in /apps/tests/z1/Accelerometer I got some
numbers for you, basically you can:

- Comment out the delay at /tos/chips/adxl345/adxl345P file in line 787.
- Edit the example and start the Accelerometer only once (in boot only),
then periodically sample 1 axis

As it is the ubr (in /tos/platforms/z1/chips/msp430/usci/Z1UsciP.nc is set
to 800, as SMCLK is sourced from the DCO with /1 divider, this gives a
rough 10KHz clock (I measured this to be actually 9.8724Khz), giving you a
total reading time of 4.84ms (measured just before calling .read() and in
readDone() event).  Changing the ubr to 80 you can get a 87.912Khz clock
(measured), with a reading time of 0.711ms.

Hope this helps.

Regards,

--Antonio


On Tue, Apr 16, 2013 at 10:29 PM, Antonio Linan  wrote:

> Hola!
>
> Yes, there might be room for improvement, if you look at the code it has
> an active waits (around line 787)  that slow the readings but were
> necessary at the time, also one could try and configure the I2C module with
> different settings (UBR for example) to see if more speed is allowed.  I
> have planned a revision of the usci driver, so things may change, in the
> meantime if you wanna dig a little you are welcome, che :)
>
> Saludos!
>
> --Antonio
>
>
>
>
>
>
> On Tue, Apr 16, 2013 at 7:16 PM, Martín René  wrote:
>
>> Sorry that i didn't make the interface problem clear...
>>
>> The accelerometer is digital using i2c interface, and doesn't provide a
>> readstream interface.
>>
>> With another sensor, we reached high sampling speeds using the
>> processor's ADC, but the bus does'nt seem to reach the necessary speeds,
>> maybe delays or something else slows down the sampling...
>>
>>
>> Saludos y muchas gracias!
>>
>> ---
>> Martín René Vilugrón
>> San Carlos de Bariloche
>> Patagonia Argentina
>>
>>
>> On Tue, Apr 16, 2013 at 1:58 PM, Michael Schippling wrote:
>>
>>> There are some intriguingly named files containing "Stream" and "DMA"
>>> in the ...tinyos-2.x_main/tos/chips/**msp430/adc12 directory. Some of
>>> them even have comments which reference TEP documents that might
>>> explain what they are trying to do. Maybe one of them will allow
>>> you to run the ADC at higher rates...
>>>
>>> In T1 with the mica's (what I know) one could free-run a single
>>> ADC at low audio rates by bypassing most of TOS.
>>>
>>> MS
>>>
>>>
>>>
>>> On 4/15/2013 1:27 PM, Martín René wrote:
>>>
 We are currently using the Z1 Motes and sampling at 200Hz without
 problems, but we can't raise the sampling speed above said speed without
 starting to have problems. We need to sample at 1000Hz and we can't get
 there.

 I know that the resources of the platform are scarse, but i know that
 the ADC can manage those speeds, and as we don't have a analog
 accelerometer we neee to speed up all we can the ADXL.

 Is it possible to sample the accelometer at those speeds?
 If it is, ¿how?

 Thanks! and saludos

 ---
 Martín René Vilugrón
 San Carlos de Bariloche
 Patagonia Argentina


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 Tinyos-help@millennium.**berkeley.edu
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>>
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>
>
>
> --
> --
> Antonio Liñan Colina
> R+D+I Engineer
> @: ali...@advancare.com
> @: ali...@zolertia.com
> --
> Advancare
> T: +34 93 582 02 70
> http://www.advancare.com
> http://www.zolertia.com
> http://zolertia.sourceforge.net
> http://webshop.zolertia.com
>



-- 
--
Antonio Liñan Colina
R+D+I Engineer
@: ali...@advancare.com
@: ali...@zolertia.com
--
Advancare
T: +34 93 582 02 70
http://www.advancare.com
http://www.zolertia.com
http://zolertia.sourceforge.net
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Re: [Tinyos-help] Z1 High speed i2c accelerometer sampling

2013-04-16 Thread Antonio Linan 
Hola!

Yes, there might be room for improvement, if you look at the code it has an
active waits (around line 787)  that slow the readings but were necessary
at the time, also one could try and configure the I2C module with different
settings (UBR for example) to see if more speed is allowed.  I have planned
a revision of the usci driver, so things may change, in the meantime if you
wanna dig a little you are welcome, che :)

Saludos!

--Antonio






On Tue, Apr 16, 2013 at 7:16 PM, Martín René  wrote:

> Sorry that i didn't make the interface problem clear...
>
> The accelerometer is digital using i2c interface, and doesn't provide a
> readstream interface.
>
> With another sensor, we reached high sampling speeds using the processor's
> ADC, but the bus does'nt seem to reach the necessary speeds, maybe delays
> or something else slows down the sampling...
>
>
> Saludos y muchas gracias!
>
> ---
> Martín René Vilugrón
> San Carlos de Bariloche
> Patagonia Argentina
>
>
> On Tue, Apr 16, 2013 at 1:58 PM, Michael Schippling wrote:
>
>> There are some intriguingly named files containing "Stream" and "DMA"
>> in the ...tinyos-2.x_main/tos/chips/**msp430/adc12 directory. Some of
>> them even have comments which reference TEP documents that might
>> explain what they are trying to do. Maybe one of them will allow
>> you to run the ADC at higher rates...
>>
>> In T1 with the mica's (what I know) one could free-run a single
>> ADC at low audio rates by bypassing most of TOS.
>>
>> MS
>>
>>
>>
>> On 4/15/2013 1:27 PM, Martín René wrote:
>>
>>> We are currently using the Z1 Motes and sampling at 200Hz without
>>> problems, but we can't raise the sampling speed above said speed without
>>> starting to have problems. We need to sample at 1000Hz and we can't get
>>> there.
>>>
>>> I know that the resources of the platform are scarse, but i know that
>>> the ADC can manage those speeds, and as we don't have a analog
>>> accelerometer we neee to speed up all we can the ADXL.
>>>
>>> Is it possible to sample the accelometer at those speeds?
>>> If it is, ¿how?
>>>
>>> Thanks! and saludos
>>>
>>> ---
>>> Martín René Vilugrón
>>> San Carlos de Bariloche
>>> Patagonia Argentina
>>>
>>>
>>> __**_
>>> Tinyos-help mailing list
>>> Tinyos-help@millennium.**berkeley.edu
>>> https://www.millennium.**berkeley.edu/cgi-bin/mailman/**
>>> listinfo/tinyos-help
>>>
>>>
>
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-- 
--
Antonio Liñan Colina
R+D+I Engineer
@: ali...@advancare.com
@: ali...@zolertia.com
--
Advancare
T: +34 93 582 02 70
http://www.advancare.com
http://www.zolertia.com
http://zolertia.sourceforge.net
http://webshop.zolertia.com
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Re: [Tinyos-help] Z1 High speed i2c accelerometer sampling

2013-04-16 Thread Martín René 
Sorry that i didn't make the interface problem clear...

The accelerometer is digital using i2c interface, and doesn't provide a
readstream interface.

With another sensor, we reached high sampling speeds using the processor's
ADC, but the bus does'nt seem to reach the necessary speeds, maybe delays
or something else slows down the sampling...


Saludos y muchas gracias!

---
Martín René Vilugrón
San Carlos de Bariloche
Patagonia Argentina


On Tue, Apr 16, 2013 at 1:58 PM, Michael Schippling wrote:

> There are some intriguingly named files containing "Stream" and "DMA"
> in the ...tinyos-2.x_main/tos/chips/**msp430/adc12 directory. Some of
> them even have comments which reference TEP documents that might
> explain what they are trying to do. Maybe one of them will allow
> you to run the ADC at higher rates...
>
> In T1 with the mica's (what I know) one could free-run a single
> ADC at low audio rates by bypassing most of TOS.
>
> MS
>
>
>
> On 4/15/2013 1:27 PM, Martín René wrote:
>
>> We are currently using the Z1 Motes and sampling at 200Hz without
>> problems, but we can't raise the sampling speed above said speed without
>> starting to have problems. We need to sample at 1000Hz and we can't get
>> there.
>>
>> I know that the resources of the platform are scarse, but i know that
>> the ADC can manage those speeds, and as we don't have a analog
>> accelerometer we neee to speed up all we can the ADXL.
>>
>> Is it possible to sample the accelometer at those speeds?
>> If it is, ¿how?
>>
>> Thanks! and saludos
>>
>> ---
>> Martín René Vilugrón
>> San Carlos de Bariloche
>> Patagonia Argentina
>>
>>
>> __**_
>> Tinyos-help mailing list
>> Tinyos-help@millennium.**berkeley.edu
>> https://www.millennium.**berkeley.edu/cgi-bin/mailman/**
>> listinfo/tinyos-help
>>
>>
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Re: [Tinyos-help] Z1 High speed i2c accelerometer sampling

2013-04-16 Thread Michael Schippling 
There are some intriguingly named files containing "Stream" and "DMA"
in the ...tinyos-2.x_main/tos/chips/msp430/adc12 directory. Some of
them even have comments which reference TEP documents that might
explain what they are trying to do. Maybe one of them will allow
you to run the ADC at higher rates...

In T1 with the mica's (what I know) one could free-run a single
ADC at low audio rates by bypassing most of TOS.

MS


On 4/15/2013 1:27 PM, Martín René wrote:
> We are currently using the Z1 Motes and sampling at 200Hz without
> problems, but we can't raise the sampling speed above said speed without
> starting to have problems. We need to sample at 1000Hz and we can't get
> there.
>
> I know that the resources of the platform are scarse, but i know that
> the ADC can manage those speeds, and as we don't have a analog
> accelerometer we neee to speed up all we can the ADXL.
>
> Is it possible to sample the accelometer at those speeds?
> If it is, ¿how?
>
> Thanks! and saludos
>
> ---
> Martín René Vilugrón
> San Carlos de Bariloche
> Patagonia Argentina
>
>
> ___
> Tinyos-help mailing list
> Tinyos-help@millennium.berkeley.edu
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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[Tinyos-help] Z1 High speed i2c accelerometer sampling

2013-04-15 Thread Martín René 
We are currently using the Z1 Motes and sampling at 200Hz without problems,
but we can't raise the sampling speed above said speed without starting to
have problems. We need to sample at 1000Hz and we can't get there.

I know that the resources of the platform are scarse, but i know that the
ADC can manage those speeds, and as we don't have a analog accelerometer we
neee to speed up all we can the ADXL.

Is it possible to sample the accelometer at those speeds?
If it is, ¿how?

Thanks! and saludos

---
Martín René Vilugrón
San Carlos de Bariloche
Patagonia Argentina
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