Lopy4 : lora callback issue

[Thierry]

Hello,
the code

from network import LoRa                                                                                                                              
                                                                                                                                                      
def onReceive(interface):                                                                                                                             
    print("LoRa RX Event")                                                                                                                            
                                                                                                                                                      
lora_Interface = LoRa(LoRa.LORA, region=LoRa.EU868,
                      frequency = 868100000,bandwidth=LoRa.BW_125KHZ,
                      sf=7, coding_rate=LoRa.CODING_4_5,
                      preamble=8,  power_mode=LoRa.ALWAYS_ON,
                      public=False)

lora_Interface.callback(trigger=LoRa.RX_PACKET_EVENT,
                        handler=onReceive)

works well.
But if I add at the end

while True:
       pass

the callback is no longer run.

If I stop using ctrl-c, the callback is called.

Is this normal?
Is the callback not an interrupt?

Thanks
Thierry

[Thierry]

This post is deleted!

[Gijs]

I think @d-alvrzx is correct here. You need some 'idle' time on the CPU for the callback to be registered. I believe its not a hardware routine that is used for the callback, but merely on top of the RTOS.

[d.alvrzx]

@Thierry Something similar happened to me awhile back, but not with Lora callbacks, but with threads. I remember what I ended up doing was adding a short sleep (something like sleep_ms(10)) to the main loop. That way the loop would yield occasionally, and threads would execute correctly. Maybe try doing this?

This is the thread where this was discussed: https://forum.pycom.io/topic/5805/main-thread-blocks-auxiliary-threads-thread-module/6?=1600903682512