GPIO activate on startup

[naitreia]

Hi,

is it possible to activate on startup a GPIO-Pin to activate an Optokoppler?

Cheers

[naitreia]

Hi,

noone who can help me?

i tryed it with this as script but it's not working:

---

case "$1" in
start)
echo „18“ > export
echo "out" > gpio18/direction
echo "1" > gpio18/value
;;
stop)
echo "0" > gpio18/value
;;
restart|reload)
Add your restart / reload code here!
;;
*)
esac

exit $?

Cheers

[naitreia]

Hi,

really no one who can help here?
I only want to have for example GPIO18 as output when recalbox is starting to controle a optocoupler.

Cheers

[ian57]

@naitreia you can create the custom.sh file in /recalbox/share/system/ like this :

#!/bin/sh
#
# Start optocoupler
#
# Support for optocoupler 
#
 
# GPIO numbers should be from this list
# 0, 1, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25
 
# Note that the GPIO numbers that you program here refer to the pins
# of the BCM2835 and *not* the numbers on the pin header. 
# So, if you want to activate GPIO7 on the header you should be 
# using GPIO4 in this script. Likewise if you want to activate GPIO0
# on the header you should be using GPIO17 here.
 
start() {
        echo -n "Starting opto: "
        # Set up GPIO 18 and set to output
        echo "18" > /sys/class/gpio/export
        echo "out" > /sys/class/gpio/gpio18/direction
        # Write output
        echo "1" > /sys/class/gpio/gpio18/value
        echo "OK"
}
 
stop() {
        echo -n "Stopping opto: "
        # Set up GPIO 18 and set to output
        echo "18" > /sys/class/gpio/export
        echo "out" > /sys/class/gpio/gpio18/direction
        # Write output
        echo "0" > /sys/class/gpio/gpio18/value
        # Clean up
        echo "18" > /sys/class/gpio/unexport
        echo "OK"
}
 
case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart|reload)
        stop
        start
        ;;
  *)
        echo "Usage: $0 {start|stop|restart}"
        exit 1
esac
 
exit $?

don't forget

chmod 755 custom.sh

You can try to use it with

/etc/init.d/S99custom start

you should get

# /etc/init.d/S99custom start
Starting opto: OK

[naitreia]

Thx for this i will try it today!

[ian57]

@naitreia I corrected 2 errors in the scripts above, please be sure to copy the code after this post