hi johnie,
[copying the list]
so, you don't want to measure the signal, you just want to know when it
happens. i see. right, you don't want to do analog-digital conversion.
the analog expansion (AnEx) board i suggested is the "external" one.
you can use ser0_cts, clearly marked "CTS" on the anex.
-steve
On 05/22/2012 01:04 PM, Johnie Z wrote:
Hi Steve,
Thank you for your reply, these days, we found maybe using GPIO
interrupt is a better way for our demand, the signal changing we want to
capture is just a low-to-high or high-to-low edge, we also found it's
quite similar to the situation in one mail also answered by you:
http://www.mail-archive.com/[email protected]/msg00309.html
But we are using the external expansion board offered by the shimmer
company not the internal one:
http://www.shimmer-research.com/p/products/sensor-units-and-modules/expansion-board
We try to use GPIO10 on MSP430 but it's used by the button, we also
tried exactly the same way recommended by you mentioned in the mail,
it's that we could use BSL_RX, but it's not useful, according to the
manual, we think maybe the BSL_RX could be used as GPIO only on internal
expansion board maybe. We also try to find the SER0_RTS on the board,
but not find it.
Do we have any other choice on using GPIO interrupt by using the
external expansion board?
Best regards,
Johnie
2012/5/18 steve ayer <[email protected] <mailto:[email protected]>>
hi johnie,
you should take a look at the msp430 user manual, chapter 17, to
read about configuring sampling; i'm not sure if the default mode
will work for your app. doc is ti name slau049f.pdf, iirc.
you should also examine
tos/platforms/shimmer/__shimmerAnalogSetupP.nc and its component
wiring file to understand where and how to make mods that may
accommodate your requirements.
i can't tell you the best way to go about this, but i'll make a
couple of suggestions: use the fastclock module (just wire it to
softwareinit) in your app to give you a much faster, cleaner smclk,
which the adc module uses for a sample clock; you'll need a scope to
validate whatever result you're seeing; and, you should use the
analog expansion board to make it easy to look at the signal that
you're sampling.
finally, to answer your question, the adc module interrupts when a
conversion is complete. the default configuration in
shimmeranalogsetup uses the dma module to gobble this interrupt, as
it's typically running a sequence of conversions and so the app just
gets one interrupt when all is complete and in local memory.
i hope that this helps,
steve
On 05/18/2012 07:11 AM, Johnie Z wrote:
Hi all,
I'm trying to read some signal using ADC, but the signal
will last
for very short term, 0.0002sec. How can I read it, is there any
interrupt in TinyOS we can use to get this work?
Regards,
Johnie
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