Steve McKown ha scritto:
On Tuesday 11 September 2007 08:48:49 am Leonardo wrote:
Steve McKown ha scritto:
On Tuesday 11 September 2007 08:25:14 am Leonardo wrote:
Hy guy,
I need to help. I want to capture the clock of my telosb. I know that i
have to use MSP430 but how?
how can I get the clock with MSP430?
Two questions: which clock do you want to get, and how do you want to get
it? For the former, the msp430 maintains a number of clocks, for example,
MCLK, SMCLK, ACLK. For the latter, are you wanting to expose the clock
to a digital output pin for use by a bit of add-on hardware, or do you
want to expose it to a software component to trigger some action?
Steve
i need to get the clock because i have to sincronized my wireless
network. i have to get the clock and set the clock on my telosb. i
didn't know that there are many clock in telosb, but I need to only one.
Thanks for help me
You probably want to look at the msp430's Timer B, which is wired in TinyOS to
the 32KHz crystal. This clock runs even in sleep mode, which is probably
what you need to deal with timed radio events. The standard TinyOS
Timer<TMilli> is a software timer attached to Timer B. There may be a 32KHz
resolution Timer<xxx>; I don't recall off the top of my head.
So I presume that you'll pass around some kind of timebase or offset in radio
packets between nodes, when the nodes can then use to determine which next to
transmit or receive. You probably can't manage more than a gross
coordination without digging into the radio's software stack.
If you can, try to use the LPL (low power wireless) mode of the cc2420 radio
stack. It's already there and works pretty well. If you need something
else, check the TEPs; there's one that covers the software layers in the new
stack, and you could create your own layer to implement a new timing policy
if that's what you need.
Cheers,
Steve
Thanks for you help Steve, but I have another problem and i think my
english don't help me :D
I need to get and set the clock of my process for sicronized my
telos..... the problem is that i don't know the way to get and set the
clock.... Do you understand me now? Sorry for my english
In my project i have to send the clock of master on network in the
beacon message. The slave get the clock and set its clock. in this way
they are sincronized because in the beacon vector there is the correcly
sequence to transmit and receive the data message. and in this way each
node rise up at the right moment.
thanks
Leonardo
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