System.sleep taking ages to enter

Troubleshooting
1

Hi all

Having an intermittent issue where my application is hanging on System.sleep(pin_intwkp,RISING,30);

Sometimes it enters sleep fine, and other times it just hangs on this sleep call.

???

2

Could you possibly share more of your code? At least the context of where you are calling System.sleep()?

3

Sure, so I have a loop that checks for gps fix. I need to sleep the electron during this for 2 reasons, one it’s noisy as affects the gps fix time, and two, to save power.

This is the code block…

while(gps_healthy && fixstage < 2 && gps_secstaken < gps_timeout) { 
            if (leddebug) RGB.color(20, 0, 20); //purple, set led to purple so i can see if sleep command is hanging
            System.sleep(pin_intwkp,RISING,30); //800ua from mcu
            
            long gps_attempt_startsecs = Time.now();
            bool havesentence = false;
            while(!havesentence && (Time.now() - gps_attempt_startsecs) < 5) {
                
                watchdog_pat();
                if (leddebug) RGB.color(10, 0, 0); //red
                
                long serial_startsecs = Time.now();
                while(Serial1.available()) {
                    char readbyte = (char)Serial1.read();
                    if (gps.encode(readbyte)) {
                        //check for sentence
                        if (gps.satellites.isUpdated()) {
                            havesentence = true;
                            sentencescount ++;
                        }
                        
                        //Check for fix
                        if (gps.location.isValid()) {
                            fixstage = 1;
                            if (leddebug) RGB.color(0, 0, 10); //blue
                        }
                                                
                        //check for good fix
                        if (gps.location.isValid() && (int)gps.hdop.value() > 0.0 && (int)gps.hdop.value() <= 100) {
                            fixstage = 2;
                            if (leddebug) RGB.color(10, 0, 10); //purple
                        }
                    }
                }
            }
            
            gps_secstaken = (Time.now() - gps_startsecs);
        }
4

Are you sure that pin_intwkp is not changing at the point System.sleep() is called? Could you put some output to Serial or log traces, also include the time millis() /micros() and similarly after the System.sleep() with the time in millis()/micros(). What is the Device OS?

Curious to know why you are using Time.now() to determine the seconds the gps fix takes and not millis() or Time.local()?

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