** Summary changed:
- RPi.GPIO doesn't detect falling edge (wait_for_edge, add_event_detect)
+ Internal pull-up resistors not working
** Description changed:
Consider the 3 following scripts :
1~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#!/bin/python3
from gpiozero import Button
import time
import os
stopButton = Button (17)
while True:
if stopButton.is_pressed:
os.system ("sudo shutdown now -h")
time.sleep (1)
exit (1)
2~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#!/bin/python3
import RPi.GPIO as GPIO
import os
import time
from threading import Thread
GPIO.setwarnings (False)
GPIO.setmode (GPIO.BCM)
shutdown_pin = 26
GPIO.setup (shutdown_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
def shutdown_check():
while True:
pulsetime = 1
GPIO.wait_for_edge (shutdown_pin, GPIO.FALLING)
print ("falling detected")
time.sleep (0.01)
while GPIO.input (shutdown_pin) == GPIO.LOW:
time.sleep (0.01)
pulsetime += 1
if pulsetime >=2 and pulsetime <=3:
os.system ("sudo reboot")
elif pulsetime >=4 and pulsetime <=5:
os.system ("sudo shutdown now -h")
try:
t1 = Thread (target = shutdown_check)
t1.start ()
except:
t1.stop ()
GPIO.cleanup ()
exit (0)
3~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#!/bin/python3
import RPi.GPIO as GPIO
import time
import os
GPIO.setmode (GPIO.BCM)
GPIO.setup (17, GPIO.IN, pull_up_down = GPIO.PUD_UP)
def Shutdown (channel):
print ("Shutting down...")
os.system ("echo $(date) >> shutdown.log")
time.sleep (3)
os.system ("sudo shutdown now -h")
exit (0)
GPIO.add_event_detect (17, GPIO.FALLING, callback = Shutdown,
bouncetime=2000)
while 1:
time.sleep (1)
exit (1)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The above scripts are common shutdown scripts that can be found on the
web, utilizing an NO pushbutton connected to GPIO 26 and ground
- (physical 37). None of the above scripts work though, since a falling
- edge is never detected. My setup has been tested and actually, the 1st
- script was working properly on Raspberry Pi OS a few weeks ago (before
- switching to Ubuntu) and the other 2 were never tested on Raspberry Pi
- OS. gpiozero uses rpi.gpio as the pin factory. A different pin was
- tested too.
+ (physical 37). None of the above scripts work though, since the internal
+ pull-up resistors don't seem to work, and the GPIOs always read LOW. My
+ setup has been tested twice in Raspberry Pi OS (the resistors worked
+ there, measured with a scope). gpiozero uses rpi.gpio as the pin
+ factory. A different pin was tested too.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: python3-rpi.gpio 0.6.5-1ubuntu3
ProcVersionSignature: Ubuntu 5.4.0-1021.24-raspi 5.4.65
Uname: Linux 5.4.0-1021-raspi aarch64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: arm64
CasperMD5CheckResult: skip
Date: Wed Oct 14 20:27:59 2020
ImageMediaBuild: 20200731
ProcEnviron:
TERM=alacritty
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: rpi.gpio
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1899824
Title:
Internal pull-up resistors not working
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