[Shimmer-users] Hosttimelogging GSR and accelerometer xyz.

[Fola Alamudun]

I'm modifying hosttimelogging to include gsr data as well as accelerometer.
I seem to be having a problem with chunks of missing data.
I started of with a version of hosttimelogging that collects gsr_raw and
gsr_res with a timestamp at the beginning of the file.
When I add accelerometer x, y, and z, the output i get seems to be missing
about 7s of data periodically.
Bellow is a snippet of the portion i feel may have a problem:

void autorange_gsr() {
uint8_t current_active_resistor = active_resistor;
if(current_buffer == 0) {
active_resistor = call Gsr.controlRange(*(sbuf0 +
(dma_blocks*NUM_ADC_CHANS-1)), active_resistor);
*(sbuf0 + (dma_blocks*NUM_ADC_CHANS-1)) |= (current_active_resistor
<< 14);
}
else {
active_resistor = call Gsr.controlRange(*(sbuf1 +
(dma_blocks*NUM_ADC_CHANS-1)), active_resistor);
*(sbuf1 + (dma_blocks*NUM_ADC_CHANS-1)) |= (current_active_resistor
<< 14);
}
}

async event void DMA0.transferDone(error_t success) {
dma_blocks++;
autorange_gsr();

atomic DMA0DA += 8;
// flash the green led approx. once every two seconds
if(!(dma_blocks%20))
call Leds.led2On();
else
call Leds.led2Off();


if((dma_blocks+1) * NUM_ADC_CHANS > 510){
dma_blocks = 0;

if(current_buffer == 0){
call DMA0.repeatTransfer((void *)ADC12MEM0_, (void *)sbuf1,
NUM_ADC_CHANS);
current_buffer = 1;
}
else {
call DMA0.repeatTransfer((void *)ADC12MEM0_, (void *)sbuf0,
NUM_ADC_CHANS);
current_buffer = 0;
}

post store_contents();
}
}

Any help will be greatly appreciated. thanks.

*"Nothing will benefit human health and increase chances for survival of
life on Earth as much as the evolution to a vegetarian diet." ~ Albert
Einstein (1879 - 1955).

Fola Alamudun
Computer Engineering
Texas A&M University
mobile: [phone] | email: ***@tamu.edu*

[Jong Chern Lim]

Hi Fola,



There aren't any outstanding issues that we know off which might be causing
the problem you are seeing. Albeit inconvenient at the meantime I would
suggest taking a look at Param Logging
(http://tinyos.cvs.sourceforge.net/viewvc/tinyos/tinyos-2.x-contrib/shimmer/
apps/ParamLogging/) , if you don't require the host time this would meet
your needs.



Also FYI, we are in the process of completing a more complete logging
application (target release is end of this quarter). It is a more complete
and straightforward solution which along with other things, include a time
sync between different shimmer devices solution, supports the full array of
Shimmer sensor boards, allows easy configuration of the different sensors
(e.g Accel Range) and etc.



Best regards,

JC



_____

From: shimmer-users-***@eecs.harvard.edu
[mailto:shimmer-users-***@eecs.harvard.edu] On Behalf Of Fola Alamudun
Sent: 28 February 2013 04:29
To: shimmer-***@eecs.harvard.edu
Subject: [Shimmer-users] Hosttimelogging GSR and accelerometer xyz.



I'm modifying hosttimelogging to include gsr data as well as accelerometer.

I seem to be having a problem with chunks of missing data.

I started of with a version of hosttimelogging that collects gsr_raw and
gsr_res with a timestamp at the beginning of the file.

When I add accelerometer x, y, and z, the output i get seems to be missing
about 7s of data periodically.

Bellow is a snippet of the portion i feel may have a problem:



void autorange_gsr() {

uint8_t current_active_resistor = active_resistor;

if(current_buffer == 0) {

active_resistor = call Gsr.controlRange(*(sbuf0 +
(dma_blocks*NUM_ADC_CHANS-1)), active_resistor);

*(sbuf0 + (dma_blocks*NUM_ADC_CHANS-1)) |= (current_active_resistor
<< 14);

}

else {

active_resistor = call Gsr.controlRange(*(sbuf1 +
(dma_blocks*NUM_ADC_CHANS-1)), active_resistor);

*(sbuf1 + (dma_blocks*NUM_ADC_CHANS-1)) |= (current_active_resistor
<< 14);

}

}



async event void DMA0.transferDone(error_t success) {

dma_blocks++;

autorange_gsr();



atomic DMA0DA += 8;

// flash the green led approx. once every two seconds

if(!(dma_blocks%20))

call Leds.led2On();

else

call Leds.led2Off();





if((dma_blocks+1) * NUM_ADC_CHANS > 510){

dma_blocks = 0;



if(current_buffer == 0){

call DMA0.repeatTransfer((void *)ADC12MEM0_, (void *)sbuf1,
NUM_ADC_CHANS);

current_buffer = 1;

}

else {

call DMA0.repeatTransfer((void *)ADC12MEM0_, (void *)sbuf0,
NUM_ADC_CHANS);

current_buffer = 0;

}



post store_contents();

}

}



Any help will be greatly appreciated. thanks.




"Nothing will benefit human health and increase chances for survival of life
on Earth as much as the evolution to a vegetarian diet." ~ Albert Einstein
(1879 - 1955).

Fola Alamudun
Computer Engineering
Texas A&M University
mobile: [phone] | email: ***@tamu.edu