Use chSysLock() to make sleep

[Jessica]

What is locked after using chSysLock(); ?

Is it possible to make a user defined sleep using chSysLock() and a timer ? (Suppose the timer is already initialized)

void UDSleep (unsigned int sleepDelay){
TIM_SetCounter(TIM2, 0);
TIM_Cmd(TIM2, ENABLE);
chSysLock();
while (TIM_GetCounter(TIM2) < sleepDelay ){

}
chSysUnlock();
}

Thanks,
Jessi

[Giovanni]

Hi,

It is possible but the delay would degrade the realtime performance of the system because no preemption could occur during the lock.

BTW, something similar is already present in the GPT driver, see gptPolledDelay().

Giovanni

[Jessica]

Hi,

It is possible but the delay would degrade the realtime performance of the system because no preemption could occur during the lock.

BTW, something similar is already present in the GPT driver, see gptPolledDelay().

Giovanni

Hi,

Thanks for your reply,
Is there anyway to implement a high performance delay?

Jessi

[Giovanni]

See halPolledDelay() or gptPolledDelay().

For mS-class delays better use chThdSleepMilliseconds().

Giovanni

[Jessica]

See halPolledDelay() or gptPolledDelay().

For mS-class delays better use chThdSleepMilliseconds().

Giovanni

Thanks.
I need higher resolution than mS so I think halPolledDelay() works for me.

Jessi