GPIO on Olimex A64 board. Bank E not working.
Gary Otten
gdotten at gmail.com
Mon Oct 14 18:54:06 UTC 2019
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.
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