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adafruit / Adafruit_CircuitPython_DHT

CircuitPython support for DHT11 and DHT22 type temperature/humidity devices
MIT License
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bcm283x pulseio _mq.receive stuck after SIGINT(CTRL-C) #89

Open iwanicki92 opened 1 year ago

iwanicki92 commented 1 year ago

I'm not sure if it's DHT or pulseio fault but sometimes when using CTRL-C(with custom signal handler) program gets stuck on self._mq.receive(block=True, type=type) line in bcm283x/pulseio/PulseIn.py file, ps prints: libgpiod_pulsei <defunct> and sometimes before getting stuck it prints line of numbers e.g. 73, 51, 75, 50, 75, 53, 26, 53, 26, 51, 73, 52, 73, 53, 26, 53, 26, 53, 26, 51, 27, 52, 26, 53, 26, 53, 26, 53, 26, 51, 28, 51, 73, 52, 73, 53, 73, 52, 73, 51, 74, 52, 73, 53, 73, 54, 26, 51, 74, 52, 73, 51, 75, 53, 26, 52, 27, 51, 73, 53, 26, 51, 75, 53.

Python version: Python 3.9.2 OS: Raspbian GNU/Linux 11 (bullseye) Kernel: Linux 5.15.61-v7+ Architecture: armv7l Hardware: Raspberry Pi 3 Model B V1.2 DHT22: ASAIR AM2302 SNE1222402511-J

Thread stacktrace:

<RepeatTimer(Thread-1, started 1985381440)>
  File "/usr/lib/python3.9/threading.py", line 912, in _bootstrap
    self._bootstrap_inner()
  File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
    self.run()
  File "/home/iwans/repozytorium_github/sensors-and-screen-controller/dht_bug.py", line 16, in run
    self.function(*self.args, **self.kwargs)
  File "/home/iwans/repozytorium_github/sensors-and-screen-controller/dht_bug.py", line 27, in print_data
    humidity = dht.humidity
  File "/home/iwans/repozytorium_github/.venv/lib/python3.9/site-packages/adafruit_dht.py", line 284, in humidity
    self.measure()
  File "/home/iwans/repozytorium_github/.venv/lib/python3.9/site-packages/adafruit_dht.py", line 219, in measure
    pulses = self._get_pulses_pulseio()
  File "/home/iwans/repozytorium_github/.venv/lib/python3.9/site-packages/adafruit_dht.py", line 148, in _get_pulses_pulseio
    while self.pulse_in:
  File "/home/iwans/repozytorium_github/.venv/lib/python3.9/site-packages/adafruit_blinka/microcontroller/bcm283x/pulseio/PulseIn.py", line 168, in __len__
    message = self._wait_receive_msg()
  File "/home/iwans/repozytorium_github/.venv/lib/python3.9/site-packages/adafruit_blinka/microcontroller/bcm283x/pulseio/PulseIn.py", line 104, in _wait_receive_msg
    message = self._mq.receive(block=True, type=type)

Installed adafruit packages:

Adafruit-Blinka==8.19.0
adafruit-circuitpython-busdevice==5.2.4
adafruit-circuitpython-dht==4.0.0
adafruit-circuitpython-requests==1.13.2
adafruit-circuitpython-typing==1.9.2
Adafruit-PlatformDetect==3.46.0
Adafruit-PureIO==1.1.10
pyftdi==0.54.0
pyserial==3.5
pyusb==1.2.1
rpi-ws281x==4.3.4
RPi.GPIO==0.7.1
sysv-ipc==1.1.0
typing-extensions==4.5.0

Minimal code to replicate problem(stacktrace is from different code run on another thread so I can detect when it hangs and print stacktrace). Run code, press CTRL-C and after a while(couple seconds) program should hang.

import signal
import time
import board
from adafruit_dht import DHT22

if __name__ == "__main__":
    dht = DHT22(board.D4)
    def sigint_handler(_1, _2):
        pass
    signal.signal(signal.SIGINT, sigint_handler)

    while True:
        try:
            print(f"{dht.humidity=}, {dht.temperature=}")
        except:
            pass
        time.sleep(0.2)