Thank you for quick response.
(1) For RSSI, what's the meaning of the value? From Trawler, it seems to me that larger means worse quality.
From my understanding, radio's sensitivity decides whether it can receive a packet or not. Hence, should there be a threshold or range to determine good link quality through RSSI?
(2) For TOSH_DATA_LENGTH, is it constrained by TinyOS or by 802.15.4 standard? I assume the Moteiv distribution is using 802.15.4 as default MAC (correct me if wrong).
By the way, for education purpose, can I set TOSH_DATA_LENGTH larger than 128 bytes? what reason if not?
For a large TinyOS message (say TOSH_DATA_LENGTH=128), will the MAC layer actually split it into smaller frames??
(3) How to monitor the residual energy in the battery? Is it through monitoring the voltage? If so, how to do in TinyOS?
(4) How to make Delta work with TOSSIM? Do I only need add a pc.target file in /opt/moteiv/tools/make? If not, what's the exact reason why it does not work?
Thanks.On 5/9/06, Cory Sharp <[EMAIL PROTECTED]> wrote:
Hi Shiyuan,
On 5/9/06, shiyuan zhang <[EMAIL PROTECTED] > wrote:
> I am new to TinyOS, and have serveral questions regarding new Moteiv
> distribution, LQI, TOSH_DATA_LENGTH and UART0:
>
> (1) What's the difference between the following three directory:
> (a) /opt/moteiv/tinyos-1.x/tos
> (b) /opt/moteiv/tos
> (c) /opt/tinyos-1.x/tos
> Especially, for those file with same name, are they all same? This cause big
> confusion for me.
Files that exist in each of those directories are not necessarily the
same. (a) /opt/moteiv/tinyos-1.x/tos is a particular snapshot of
TinyOS 1.x used by Moteiv Boomerang. There are no custom
modifications to files in that directory, everything you find in there
you can find in CVS on its checkout date. (b) /opt/moteiv/tos
contains code written or modified by Moteiv. (c) /opt/tinyos-1.x/tos
is not used by Moteiv Boomerang.
> For instance, for CC2420Radio part, I notice tmote.target and
> /opt/moteiv/tools/java/com/moteiv/trawler
> use both
> INCLUDES += -I$(MOTEIV_DIR)/tos/lib/CC2420Radio
> INCLUDES += -I$(TOSDIR)/lib/CC2420Radio
> I tried "make tmote fileset" in Delta - also contain reference to 2 or 3
> directories ...
> Then, when we write "component CC2420RadioC", how can I know which component
> CCs2420Radio it will refer to (in case I want to modify)?
The include directives (-I's) specify the search order. The first
file found is used, so earlier specifications take precedence.
> (2) What range of LQI would mean good link quality? I want to adjust
> transmission power according to LQI.
> And what range of RSSI would mean good link quality? Which one is more
> accurate?
LQI is a better indicator of link quality (hence the name "Link
Quality Indicator") than RSSI ("Radio Signal Strength Indicator").
You should test these values in you application to determine good
thresholds that are suitable.
> (3) Does moteiv's distrubution allow the TOSH_DATA_LENGTH be at most (128 -
> 10 - 2) bytes, without other modifications?
> Can someone confirm it? I was told it can be at most 29 bytes.
I don't recall testing 128-10-2 bytes, but we have tested definitely
tested values around 40 to 60 bytes.
> (4) I am new to TinyOS. Where can I find an example code to read external
> sensor data through UART[0] or I2C[0] and so on?
http://www.moteiv.com/community/Boomerang_UART0_Sample
Best,
Cory
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