GPIO on Olimex A64 board. Bank E not working.

[Emmanuel Vadot]

On Tue, 15 Oct 2019 11:46:14 -0400
Gary Otten <gdotten at gmail.com> wrote:

> Thanks for your response.
> 
> Freebsd Version 12.0-STABLE
> 
> root@:/dev # sysctl hw.regulator.vcc-pe
> hw.regulator.vcc-pe.uvolt: 2800000
> hw.regulator.vcc-pe.always_on: 1
> hw.regulator.vcc-pe.boot_on: 0
> hw.regulator.vcc-pe.enable_cnt: 0

 That's the problem.
 Can you try with hw.regulator.disable_unused=0 in /boot/loader.conf ?
 Something is wrong somewhere as we should enable this regulator as the
always-on prop is set. I'll try to have a look this week.

> hw.regulator.vcc-pe.enable_delay: 0
> hw.regulator.vcc-pe.ramp_delay: 0
> hw.regulator.vcc-pe.max_uamp: 0
> hw.regulator.vcc-pe.min_uamp: 0
> hw.regulator.vcc-pe.max_uvolt: 2800000
> hw.regulator.vcc-pe.min_uvolt: 2800000
> 
> Yes I am testing the pins with a multimeter, I am not seeing any voltage
> swings at all on Port E.   On the external connector I see 5V on pin 1, 3.3
> on pin 3 and the correct voltage( software setting) on the other pins,
> except bank E.
> 
> PB0-PB4   voltage corresponds to software setting.
> PC4,PC7  voltage corresponds to software setting.
> PE0-PE17 no voltage swings, doesn't work.
> PL7-PL12   voltage corresponds to software setting.
> 
> I don't know if it will  help, but if I make output on a pin low, still
> when I switch the that pin from In to out,  , I see a small voltage swing
> in the milli volt range, but when I switch the PE pins from in to out, I
> don't see that small swing.  Its as if they is no software connection to
> the PE pins.
> 
> On Tue, Oct 15, 2019 at 7:18 AM Emmanuel Vadot <manu at bidouilliste.com>
> wrote:
> 
> >
> >  Hi Gary,
> >
> > On Mon, 14 Oct 2019 14:46:12 -0400
> > Gary Otten <gdotten at gmail.com> wrote:
> >
> > > I have successfully booted the FreeBSD on the Olimex board which has the
> > > Allwinner A64. I have been experimenting with the gpios,  again with
> > > success. However the 40 pin connector on the Olimex board exposes GPIO
> > pins
> > > PB0 - PB4 which function normally (voltage corresponds to software
> > setting
> > > for that pin)  and then PE0-PE17 which don't.     I have played with most
> > > of the PE0- PE17 pins with various settings, again nothing works, no
> > signs
> > > of activity. I have successfully lit the LED (PE17) with the armbian
> > > (linux) distribution for this board so I know it should work.
> > >
> > > Example
> > > gpioctl -f /dev/gpioc0 -c PB0 OUT
> > > gpioctl -f /dev/gpioc0 PB0 1
> > >
> > > The pin PB0 then goes high (1) as expected.
> > >
> > > gpioctl -f /dev/gpioc0 -c PE17 OUT
> > > gpioctl -f /dev/gpioc0 PE17 1
> > >
> > > No activity on PE17
> > >
> > >
> > > I have dug into the the driver code a bit and the files containing the
> > > settings for this board/processor, but I have had no luck figuring it
> > out.
> > >  I have studied the Allwinner a64 manual but I haven't had luck figuring
> > > out any other settings that might work.    I think I am missing a simple
> > > setting but can't figure it out, does anyone know how to get pins PE0 to
> > > PE17 to work? Thanks.
> >
> >  What version of FreeBSD are you booting on this board ?
> >  PE is a bit special on the Olinuxino as it's also used for MIPI-CSI
> > and it's drived at 2.8V by default. It's using the regulator ALDO1 from
> > the AXP PMIC and you should be able to confirm that it's enabled by
> > doing sysctl hw.regulator.vcc-pe
> >  Check for the .enable sysctl
> >  It should be on as there is the always-on property in the DTS.
> >  By default I think that the gpio pins are configured for 20mA so I
> > don't know if it would be enough for this led. If you have a multimeter
> > it would be good to confirm if you have any voltage on the ext
> > connector (you can use any PE pins, from what I see from the schematics
> > they are all safe to play with).
> >
> > --
> > Emmanuel Vadot <manu at bidouilliste.com>
> >


-- 
Emmanuel Vadot <manu at bidouilliste.com>