On Jul 17, 2007, at 11:55 PM, Daniel Widyanto wrote:
Hi all,
I have a bit questions about mcombine() in McuSleepC.nc .
tos/chips/atm128/McuSleepC.nc:100 :
powerState = mcombine(getPowerState(), call
McuPowerOverride.lowestState());
tos/chips/atm128/atm128hardware.h:132
mcu_power_t mcombine(mcu_power_t m1, mcu_power_t m2) {
return (m1 < m2)? m1: m2;
}
If the McuPowerOverride.lowestState() if fan-outed to
HplAtm128Timer0AsyncP and
my application (AppC), is it going to be :
powerState = ( getPowerState() < call
HplAtm128Timer0AsyncP.McuPowerOverride.lowestState() ) ?
getPowerState() : HplAtm128Timer0AsyncP.McuPowerOverride.lowestState
();
//and
powerState = ( getPowerState() < call
AppC.McuPowerOverride.lowestState() ) ?
getPowerState() : AppC.McuPowerOverride.lowestState();
Is it true ?
If so, according to Sec 5.2 TinyOS Programming, the order of the
combined functions is
uncertain. How do I know which value that will be passed into the
powerState ?
You know because of the < operator.
The fanout and combine will return the lowest value (which is the
highest power state).
Phil
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