How many ms for os_queryTimeCriticalJobs

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1

Hi,
I have a question about the LMIC MCCI library.
Before i send the atmega4809 to sleep i call os_queryTimeCriticalJobs(ms2osticks(1000)) but i don’t know how many ms it needs.
A value of 1000 works but i don’t really understand whats going on under the hood

if(!os_queryTimeCriticalJobs(ms2osticks(1000))){
			Serial.println("Can go to sleep");

bit_t os_queryTimeCriticalJobs(ostime_t time) {
    if (OS.scheduledjobs &&
        OS.scheduledjobs->deadline - os_getTime() < time)
        return 1;
    else
        return 0;
}

Maybe somebody can give me a hint?

2

As the comment in the code says:

// return true if there are any jobs scheduled within time ticks from now.
// return false if any jobs scheduled are at least time ticks in the future.

The number you should provide is how long you plan to sleep for.

2 Likes
3

As above, but bear in mind you may be mid-transmission, so you need to be checking for the Rx2 interval.

Or just sleep after the EV_TXCOMPLETE event.

1 Like
4

Hi, Thank you for answering

Sorry i forgot to say that i stop the main clock.

That means, when the ticks are counting only 9 seconds(Sensor readings, TX RX1 RX2)then the Main Clock and CPU is stopped for 30 minutes, i enter anyway the whole 30 minutes time
I did it that way and for the last couple of hours it works

17:51:09.920 -> os time in seconds: 713
17:51:09.920 -> Waking up and schedule sensor readings
17:51:12.044 -> 44748952: EV_TXSTART
17:51:12.091 -> Packet queued
17:51:18.138 -> 45129099: EV_TXCOMPLETE (includes waiting for RXwindows)
17:56:38.998 -> os time in seconds: 722
17:56:39.045 -> Waking up and schedule sensor readings
17:56:41.166 -> 45266989: EV_TXSTART
17:56:41.166 -> Packet queued
17:56:47.253 -> 45647259: EV_TXCOMPLETE (includes waiting for RXwindows)
5

Thank you
I set a Flag in the EV_TXCOMPLETE and have a if query in the loop

void loop() {
	os_runloop_once();
	if(canGoToSleep == 1){
		//Serial.println("packet sent, check if current RX/TX job running");
		if(!os_queryTimeCriticalJobs(ms2osticks(sleepMinutes*65536))){

maybe it is better to put the sleep section in the EV_TXCOMPLETE so i dont have to poll

6

Ugh, no, best to keep that as clean as possible.

And you may end up with other state flags which are best processed in the main loop.

7

Thank you,
it is good to know that i am following the right approach
Happy new Year