The Industrial Raspberry Pi Forum

Posted: **17 Jan 2020, 10:34**

i have a problem with using revpimodio2 library in multiple python codes in parallel
the output signal is not stable
i have made this simple test using the script bellow in two seperate files triggerring O_1 and O_2 in parallel
and reading the inputs wired to them I_1 and I_2 respectively and i attatched a led to O_1
and the result is that the led starts to blink when it's supposed to stay high (for 5 seconds ) and the Input that i'm reading is showing unexpected results

Code: Select all

import revpimodio2
import time
revpi = revpimodio2.RevPiModIO(autorefresh=True)


revpi.mainloop(blocking=False)

revpi.io.O_1.value=(False)
while True:

    revpi.io.O_1.value=(True)
    time.sleep(0.1)
    print (revpi.io.I_1.value)
    time.sleep(5)
    revpi.io.O_1.value=(False)
    time.sleep(0.1)
    print (revpi.io.I_1.value)
    time.sleep(5)

Posted: **17 Jan 2020, 11:56**

If you want to share the process image among different programs you have to set the 'direct_output' flag to true. For more details have a look into the documentation: https://revpimodio.org/en/doc2/

A better way would be ihmo to run a master with an shared instance of your revpimodio object. So it would be possible for the threads to access the IOs.

Nicolai

The Industrial Raspberry Pi Forum

problem using revpimodio2 in separate threads

problem using revpimodio2 in separate threads

Re: problem using revpimodio2 in separate threads