How do you wait for rising edge with python?

[maxmike001]

I can use pwm out and adc works, but I cannot use the following - it just reports "not detected" when I feed a 2.5V 1 KHz pwm into the pin;
I tried other pins as well. I am running a vanilla version of Linux 3.8 Angstrom, with just TTYO1 enabled. I removed the pwm and just
used a simple DC toggle, and same problem.

Code: Select all

#!/usr/bin/python

import sys
import Adafruit_BBIO.GPIO as GPIO
GPIO.setup("P9_12", GPIO.IN)
GPIO.add_event_detect("P9_12", GPIO.RISING)
print "starting test"
if GPIO.event_detected("P9_12"):
	print "rising edge detected"
else:
	print "not detected"

[akamediasystem]

I might be reading this wrong, but isn't your code only running once?

The example doesn't make it too clear, but I think to poll regularly you should do something like the following:

Code: Select all

#!/usr/bin/python

import sys
import Adafruit_BBIO.GPIO as GPIO
GPIO.setup("P9_12", GPIO.IN)
GPIO.add_event_detect("P9_12", GPIO.RISING)
print "starting test"
while True:
    if GPIO.event_detected("P9_12"):
       print "rising edge detected" 
    else:
       print "not detected"

Unfortunately my BBB is in the middle of something and I can't test this myself. I'll try to remember to test tomorrow if you haven't already had a chance to do so...

Hope this helps,

AKA

[maxmike001]

Thanks AKA - I solved it - what I needed was wait_for_edge; didn't realize it was there for the taking.