I haven't used the FLASH so I can't give good advice.
David Moss on this list seems to know a lot about it,
perhaps he will answer?
MS
Munaretto, Daniel wrote:
Hi Michael,
The problem is that we need more memory for our project. Even if FLASH memory
is slow, i think we need to use all possibilties that micaz mote gives to us.
Is it possible to use it for writing data? (i know that for ADC readings it is
used, and just to remember we use tinyos 1.x and micaz motes, Atmel ATMEGA128)
if yes, how?and how much? and what about relative energy consumption and time
requested? it would be really useful...any informations will be really
appreciated!
Because we can think to solve this memory problem by using RAM and FLASH
together: sometimes, when we receive packets for bufferizing, we can move this
buffer from RAM to FLASH memory temporary or viceversa, i don't know exactly
how i should manage this situation. But what i mean is something similar to PC
hard-disk....
cheers
Daniele
-----Original Message-----
From: Michael Schippling [mailto:[EMAIL PROTECTED]
Sent: Mon 7/31/2006 9:12 PM
To: Munaretto, Daniel
Cc: tinyos-help@Millennium.Berkeley.EDU
Subject: Re: [Tinyos-help] Help with real node behaviour!Micaz,tinyos 1.x
As far as I know all of the 4k of RAM is available for use,
so you should have about 2.5k for your buffer allocs. Maybe
you can put in an allocation size detector for your simulation
so you can see where it (is assumed to) overflow? Or log all
the alloc/frees and match them up...
MS
Munaretto, Daniel wrote:
> Thanks for your answer, in my program i allocate memory to create in each mote a buffer-chain (i use structures that allocate memory dynamically). But i don't know exactly how much dynamic memory i can use in Micaz motes.
> For example, if after compiling i use 1419 bytes in RAM and 19748
bytes in ROM, is the rest used for dynamic allocation?
> i don't understand this passage about exactly how much memory i can
use dynamically..for me understanding would be really important.
> Thanks for your availability,
>
> Cheers
> Daniele
>
> -----Original Message-----
> From: Michael Schippling [mailto:[EMAIL PROTECTED]
> Sent: Fri 7/28/2006 7:12 PM
> To: Munaretto, Daniel
> Cc: tinyos-help@Millennium.Berkeley.EDU
> Subject: Re: [Tinyos-help] Help with real node behaviour!Micaz,tinyos 1.x
>
>
>
> Well there's 128K of PROM and 4K of RAM in the ATMEGA 128
> and I believe it is all available. At the end of the TOS
> compile you get a line that says how much your program is
> using. If you are not doing any kind of dynamic allocation
> this should be the maximum used. Perhaps you have a pointer
> or something that is running amuck in a way that you don't
> see in simulation.
>
> I think using FLASH is rather slow and the number of MTBF
> cycles is not conducive to temporary storage.
>
> MS
>
> Munaretto, Daniel wrote:
> > I did other experiments and i found that, with little data size, the nodes are able to send and receive all packets they generate. So it's definitely a memory problem. But i think not to use so much memory and i free, when i can, the used structures. Remember i need a buffer chain in each node cause i store incoming packets and then i create new coded packets from these buffers.
> > Now my question is: with Micaz motes, tinyos 1.x, how much memory in ROM and RAM can i use?
> > and is it possible to use the FLASH memory?if yes how?and what's the size of it?
> > If possible, i'd like to receive very precise informations for understanding my problem in the best way.
> >
> > Thanks very much for your availability
> > cheers
> > Daniele
> >
> > -----Original Message-----
> > From: Michael Schippling [mailto:[EMAIL PROTECTED]
> > Sent: Thu 7/27/2006 9:25 PM
> > To: Munaretto, Daniel
> > Cc: tinyos-help@Millennium.Berkeley.EDU
> > Subject: Re: [Tinyos-help] Help with real node behaviour!Micaz,tinyos 1.x
> >
> >
> >
> > Sounds like your buffering scheme is overflowing and crashing the mote.
> > One clue is that I seem to see a lot of length 5 buffer pools in TOS...
> > You might want to double check that you are freeing buffers after use.
> > MS
> >
> > Munaretto, Daniel wrote:
> > > Hi all,
> > > after a lot of simulation in TOSSIM, i uploaded my programs on the motes.
> > > By reading the leds, i'm able to understand what happens.
> > >
> > > If i run on motes a normal flooding, it's all ok. All packets are sent and received.
> > >
> > > But if i run a more complex program, where before broadcasting packets i code packets i stored in the node's internal buffer, i notice i cannot receive over 5 packets (in my experiments i generate 8 packets per node). But if i run only one mote, it's able to generate all packets.
> >
> > > So if i run 2 nodes, one seems blocked or crashed after receiving 5 packets (Leds stop to work, fixed on a color or void) and the other one continue to send packets in a properly way.
> >
> > > I made with several motes and it's the same, also changing batteries.
> > >
> > > Anyone could help me, please?
> > > i don't know what's wrong, in TOSSIM was all ok.
> > > And i'm using micaz motes, tinyos 1.x, after compiling i see: used RAM=1657 bytes, used ROM=19600 bytes.
> > >
> > > Thanks very much, i hope someone could answer to me!
> > > cheers
> > > Daniele
> > >
> > >
> > > _______________________________________________
> > > Tinyos-help mailing list
> > > Tinyos-help@Millennium.Berkeley.EDU
> > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
> >
>
>
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