pine64 SDK/library

[capnOfdShip]

is there some library for pine64 like what Rpi has where you can read and write information to the io ports?  I believe there is I just couldn't find it.

[martinayotte]

https://github.com/swkim01/RPi.GPIO-PineA64

[Keex]

https://github.com/swkim01/RPi.GPIO-PineA64

Looks cool, could you maybe give a rough tutorial?

[Luke]

Excellent - many people asking about GPIO

[martinayotte]

Here is a quick example of GPIO LED Blinker :

Code:

import RPi.GPIO as GPIO
LED_PIN = 26
GPIO.setmode(GPIO.BCM)
GPIO.setup(LED_PIN, GPIO.OUT)
while 1:
  GPIO.output(LED_PIN, GPIO.HIGH)
  time.sleep(0.25)
  GPIO.output(LED_PIN, GPIO.LOW)
  time.sleep(0.25)
GPIO.cleanup()

[adamw]

Is modification of GPIO via /sys/class/gpio not supported?

I'm trying to setup GPIO 17 as an output.

I can successfully export 17 as a GPIO, but then when I go to that directory ("gpio17") and try to set its direction, I get "Unknown error 517".

I only have a couple GPIO that I need to use, so I'm wondering if the whole library is worth it, but if there's no other way...maybe I'll have to use it?

[martinayotte]

You're right ! It seems that there is an issue there.
When I get chance, I will try to investigate ...
(In the mean time, you should probably use the Python library from https://github.com/swkim01/RPi.GPIO-PineA64)

[martinayotte]

@adamw,
Doing some searches, I found out the cause of the issue : since awhile, the pin numbering scheme in /sys/class/gpio has changed !

See : http://linux-sunxi.org/GPIO#Accessing_th...ine_kernel
Also, here on the forum :
http://forum.pine64.org/showthread.php?t...00#pid4000

On Pine64, the GPIO17 is attached to PC7, so, for the /sys/class/gpio, the numbering would be :

Code:

('C' - 'A') * 32 + 7
or
2 * 32 + 7 = 71

You can now give it a try with :

Code:

echo "71" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio71/direction
echo 1 > /sys/class/gpio/gpio71/value

[adamw]

That's great news!
Thanks for sharing.