I'm looking at using OpenBSD 4.4's gpio functions [1] on a Net4801 to
set some pins [2] to have +3.3 volts when on and 0 volts when off.
However, regardless of the state reported by gpioctl, the pins show
about +3.3 volts on my meter.
# gpioctl 0 2; gpioctl 2 2; gpioctl 4 2; gpioctl 6 2;
pin 0: state 1 -> 0
pin 2: state 1 -> 0
pin 4: state 0 -> 1
pin 6: state 0 -> 1
# gpioctl 0 2; gpioctl 2 2; gpioctl 4 2; gpioctl 6 2;
pin 0: state 0 -> 1
pin 2: state 0 -> 1
pin 4: state 1 -> 0
pin 6: state 1 -> 0
The gpio<-> JP5 pin mappings are in /etc/rc.securelevel as follows:
gpioctl -c 00 out pp; # should be pin no. 3 ?
gpioctl -c 02 out pp; # should be pin no. 5 ?
gpioctl -c 04 out pp; # should be pin no. 7 ?
gpioctl -c 06 out od; # should be pin no. 9 ?
FWIW, there does not seem to be an obvious way to leave the system in
securelevel 0. The boot sequence says
"setting kernel security level: kern.securelevel: 0 -> 0"
but from the shell, it shows level 1:
$ sysctl kern.securelevel
kern.securelevel=1
That's even after trying to set it explicitly in /etc/rc:
sysctl kern.securelevel=0
(yeah, that should be left alone...)
Regards
-Lars
[1]
http://www.openbsd.org/cgi-bin/man.cgi?query=gpioctl&apropos=0&sektion=0&manpath=OpenBSD+4.4&arch=i386&format=html
[2] see sect. 3.5 JP5, User I/O:
http://www.soekris.com/manuals/net4801_manual.pdf
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