On Friday 06 April 2007 08:35, Mayur Maheshwari wrote: > Thanks Steve for the reply. This is a very helpful information. > > If the MCU goes to LPM3 when only a timer is runnning then it also goes > into different LPMs (LPM0-LPM4) depending on what devices are running like > the sensor and then the flash storage being written, etc.
Right. > Which LPM does the MCU goes into when these devices turn on and then off > discretely after doing the needful? Is there any documentation on it as TEP > 112 on MCU power management is void of this information. Take a look at /opt/tinyos-2.x/tos/chips/msp430/McuSleepC.nc for all the gory details. Generally speaking, the processor is in LPM0 (active), LPM1 or LPM3, depending upon which resources are in use. > > Regards > Mayur > > On 4/6/07, Steve McKown <[EMAIL PROTECTED]> wrote: > > Hi, > > > > I can answer one of your questions. The msp430 goes to LPM3 (low power > > mode > > 3) in this case, which consumes about 1.1uA. The timer driven by the > > 32kHz > > crystal remains active so the msp430 can be awakened by a timer like > > TimerMilliC() being fired. > > > > On Friday 06 April 2007 07:41, Mayur Maheshwari wrote: > > > Hi All, > > > > > > I have few questions relating to the power management being done in > > > > TinyOS > > > > > 2.x > > > > > > 1. While perusing through the mails on the list it seems that the MCU > > > (Atmega128L or MSP430) sleeps if there are no tasks in the task queue. > > > However, my application uses a timer to periodically sense data and > > > > storing > > > > > it. This means that there is always a timer running. Does the MCU still > > > goes to any of the low power modes when there is no task in the queue > > > except the timer is running. > > > > > > 2. What is the energy requirement of the radio in the Low Power > > > > Listening > > > > > mode on a cc2420 radio? I read this while David Moss was implementing > > > > the > > > > > LPL scheme: > > > > http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2006-September/ > >01 > > > > >9365.html . Is > > > it 5.09mAh/day for a 2 sec receive check or lesser? > > > > > > 3. Does the radio draw less current when it wakes up and checks for the > > > channel being modulated in the LPL state. I guess it should be less > > > than > > > > 8 > > > > > mA which it consumes in the actual Rx mode. > > > > > > Regards _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
