On 9/21/06, Cory Sharp <[EMAIL PROTECTED]> wrote:
On 9/21/06, bhushan bhatt <[EMAIL PROTECTED]> wrote:I have a question about MAC Backoff. If we implement the same algorithm with SMAC can we solve the problem of all the stations transmitting at the same time and thus giving less throughput ??Also i have a question about the CPU sleep in Tmotes. I have read in one of the threads that Tmote Sky sends CPU to sleep when there is no processes in the queue. What is the threshold for this CPU sleep ???
What do you mean by "threshold"? The MCU automatically sleeps when it is not executing an interrupt handler and there are no tasks to run. It wakes back up again when an interrupt fires.
Thanks,
Bhushan
CoryCory Sharp <[EMAIL PROTECTED]> wrote:You would need to disable the MAC backoff to send a packet immediately. See the MacBackoff interface provided by CC2420RadioC. However, once you set the backoff to zero, you will probably get higher packet loss as nodes transmit packets over each other.
CoryOn 9/21/06, ¹ÚÆDZ٠<[EMAIL PROTECTED]> wrote:I implement one application, CountSleepRadio in Contrib/ucb/apps/CountRodio.
Mainly, CountSleepRadio wakes up every 2 seconds, starts the radio,
sends a packet with the current count, and then immediately shuts off
the radio and UART via the GenericComm StdControl interface.But it seems this application gives the wake up time 10/1024 s. But if i decrease this wake time underthe 3/1024 s, it seems node can't send packets.In the sky data sheet, there are times to wake up from LPM3 is 6 micros, radio oscillator startup time is max 860 micros.In this application, the wake up time 3/1024 s takes too longer time than my thought (860 micros).Could you give advice to understand this wake up time limits?Thanks you.
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