GPIO LED blinker using SYSFS on the Rock64

[tllim]

Hi Marcus,

Lets create ROCK64 GPIO tutorial guide in PDF format and post at wiki site.

Yes;  I'm actually working on that !  ... I'll let you know when its ready.  It will also include the Python and C|C++ methods as well.

Thanks :-)

[MarkHaysHarris777]

I updated my chart; while pin GPIO2_A3 does NOT work as output (it should) the pin DOES work as input !

... this was a surprise !

[fra87]

Hi
First of all thank you for your work. Very helpful!
I'd like to share a modified version of the function to calculate the pin number, with a bit of validation to be sure that the string is ok (I hope it is ok). The function returns -1 if there was any problem with the string

Code:

def GPIO_name2gpio(value):
    value = value.upper()
    if (value[0:4] != 'GPIO') or (value[5] != '_'):
        return -1
    try:
        bank_num = int(value[4:5], 10)
        pad_nam = GPIO_pads[value[6:7]]
        pad_num = int(value[7:], 10)
        if (bank_num < 0) or (bank_num > 3) or (pad_num < 0) or (pad_num > 7):
            return -1;

        return (bank_num * 32) + (pad_nam * 8) + pad_num
    except (ValueError,KeyError):
        return -1

[dontpostalot]

I noticed the pin numbers now have an additional offset of 1000 in the latest images (kernel 4.4.103).

[Leapo]

Went ahead and wrote a Rock64 GPIO library for Bash: https://github.com/Leapo/Rock64-BashGPIO

Working on porting/re-implementing RPi.GPIO for Python now

[xalius]

Went ahead and wrote a Rock64 GPIO library for Bash: https://github.com/Leapo/Rock64-Utilities

Working on porting/re-implementing RPi.GPIO for Python now

Nice work, can you maybe start a new thread for your RPi.GPIO effort, there are probably some people that would like to contribute...

[Leapo]

Nice work, can you maybe start a new thread for your RPi.GPIO effort, there are probably some people that would like to contribute...

I'll fire up a separate thread as soon as I get the first version of the Python module uploaded to github. Shouldn't be too much longer.

I got basic functionality hammered-out and working last night. Check it out, R64.GPIO is already running RPi.GPIO compatible test code:

[ulysse132]

Hello,

I have issue when trying the code MarkHaysHarris gave :

Code:

ulysse132@rock64:~$ sudo -i
[sudo] password for ulysse132:

root@rock64:~# echo 101 > /sys/class/gpio/export
-bash: echo: write error: Invalid argument
root@rock64:~#

Could you give me a hand to make this work ? I have the same result with echo 60. I didn't try other values because I don't want to make mistakes.

I use armbian 5.42 (stretch).

Thanks for your help !

[pfeerick]

Hello,

I have issue when trying the code MarkHaysHarris gave :

Code:

ulysse132@rock64:~$ sudo -i
[sudo] password for ulysse132:

root@rock64:~# echo 101 > /sys/class/gpio/export
-bash: echo: write error: Invalid argument
root@rock64:~#

Could you give me a hand to make this work ? I have the same result with echo 60. I didn't try other values because I don't want to make mistakes.

I use armbian 5.42 (stretch).

Thanks for your help !

Export numbers have changed due to kernel updates and the like. I'll double check what the offset is now and let you know.

[gaggleoxfoggy]

I'd also like to know more about making this work on Armbian 5.42 stretch. My /sys/class/gpio only lists 5 items, gpiochip1000, 1032, 1064, 1096, 1510. Is this now accessing them as a group? I'm specifically wanting to use them as triggers so that a button press will trigger events in my python app.