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Orange Pi Zero, Python GPIO Library

Rafał Wolak

By Rafał Wolak
in Allwinner sunxi

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Borisbritwa

Borisbritwa

Posted
Posted 
#!/usr/bin/python

import time
from pyA20.gpio import gpio
from pyA20.gpio import port
from pyA20.gpio import connector

gpio.init()

gpio.setcfg(port.POWER_LED, gpio.OUTPUT)
while True:
    gpio.output(port.POWER_LED, gpio.HIGH)
    time.sleep(0.25)
    gpio.output(port.POWER_LED, gpio.LOW)
    time.sleep(0.25)

WHY THIS CODE DOES NOT WORK !!!???

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martinayotte

martinayotte

Posted
Posted

Because the POWER_LED is already in use by the kernel.

It is the same if you try to use it with sysfs. 

echo 362 > /sys/class/gpio/export
-bash: echo: write error: Device or resource busy

The only way to free it is to edit DT and removing it from the r_pio section.

 

But the STATUS_LED is already free and available.

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maco1717

maco1717

Posted
Posted

Hi,

 

I was wondering if anyone knew if I could use this https://github.com/duxingkei33/orangepi_PC_gpio_pyH3 on the Orange Pi H2+ I've noticed the header is smaller than the H3 most of the pins that are in H2+ are in H3 but not all. Please see attached image.

 

I'm assuming the GPIO ping that are in H3 I can use on H2+ looks like both use the same SoC could someone confirm this.

 

Also how difficutl would it be to add the GPIOs that are in H2+ that are not in H3.

 

Thanks.

\Marco

Capture.PNG

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maco1717

maco1717

Posted
Posted

Oh Wow! that's excelent. I got one more question tho.

 

Im looking for a similar method to use interrupt driven GPIO as in RPi.GPIO

 

GPIO.add_event_detect(pin_number, GPIO.BOTH, callback=callback_function)

 

Thanks.

 

 

 

 
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arhi

arhi

Posted
Posted

 

On 12/19/2016 at 6:16 PM, martinayotte said:

I've the I2C working, and for SPI I will probably need to tweak DT, since I'm working exclusively with Mainline.

(So, I can't provide recipe for FEX, since I don't use Legacy)

 

mainline kernel/armbian here,  "Welcome to ARMBIAN 5.27 stable Debian GNU/Linux 8 (jessie) 4.10.11-sun8i"

 

but I can't find a way to use i2c .. starting to feel frustrated :( .. (not with the system but with myself, feeling overly stupid with these oranges) so I'd really appreciate some help :)

 

I tried few libs, examples.. etc.. but they all expect /dev/i2c* to exist.. but I don't have those :(

  


root@orangepione:~/nekiliksaforuma/orangepi_PC_gpio_pyH3# modprobe  i2c-dev
root@orangepione:~/nekiliksaforuma/orangepi_PC_gpio_pyH3# modprobe --show-depends i2c-dev
builtin i2c_dev
root@orangepione:~/nekiliksaforuma/orangepi_PC_gpio_pyH3# ls -lad /dev/i2c*
ls: cannot access /dev/i2c*: No such file or directory
root@orangepione:~/nekiliksaforuma/orangepi_PC_gpio_pyH3# ls -lad /dev/i*
lrwxrwxrwx 1 root root 25 Jan  1  1970 /dev/initctl -> /run/systemd/initctl/fifo
drwxr-xr-x 3 root root 80 May 23 13:17 /dev/input
root@orangepione:~/nekiliksaforuma/orangepi_PC_gpio_pyH3#

 

I have the orangepi_PC_gpio_pyH3 you mentioned but don't see how to use it for i2c :(

 

now, I see further down the thread that DTB thingy needs to be changed but I'm stuck with it :( ... attm I have wrt i2c

  


                pinctrl@01c20800 {
                        compatible = "allwinner,sun8i-h3-pinctrl";
                        reg = <0x1c20800 0x400>;
                        interrupts = <0x0 0xb 0x4 0x0 0x11 0x4>;
                        clocks = <0x2 0x36 0x9 0xb>;
                        clock-names = "apb", "hosc", "losc";
                        gpio-controller;
                        #gpio-cells = <0x3>;
                        interrupt-controller;
                        #interrupt-cells = <0x3>;
                        linux,phandle = <0x11>;
                        phandle = <0x11>;

                        i2c0 {
                                allwinner,pins = "PA11", "PA12";
                                allwinner,function = "i2c0";
                                allwinner,drive = <0x0>;
                                allwinner,pull = <0x0>;
                                linux,phandle = <0x1d>;
                                phandle = <0x1d>;
                        };

                        i2c1 {
                                allwinner,pins = "PA18", "PA19";
                                allwinner,function = "i2c1";
                                allwinner,drive = <0x0>;
                                allwinner,pull = <0x0>;
                                linux,phandle = <0x1e>;
                                phandle = <0x1e>;
                        };

                        i2c2 {
                                allwinner,pins = "PE12", "PE13";
                                allwinner,function = "i2c2";
                                allwinner,drive = <0x0>;
                                allwinner,pull = <0x0>;
                                linux,phandle = <0x1f>;
                                phandle = <0x1f>;
                        };

...

                i2c@01c2ac00 {
                        compatible = "allwinner,sun6i-a31-i2c";
                        reg = <0x1c2ac00 0x400>;
                        interrupts = <0x0 0x6 0x4>;
                        clocks = <0x2 0x3b>;
                        resets = <0x2 0x2e>;
                        pinctrl-names = "default";
                        pinctrl-0 = <0x1d>;
                        status = "disabled";
                        #address-cells = <0x1>;
                        #size-cells = <0x0>;
                        linux,phandle = <0x54>;
                        phandle = <0x54>;
                };

                i2c@01c2b000 {
                        compatible = "allwinner,sun6i-a31-i2c";
                        reg = <0x1c2b000 0x400>;
                        interrupts = <0x0 0x7 0x4>;
                        clocks = <0x2 0x3c>;
                        resets = <0x2 0x2f>;
                        pinctrl-names = "default";
                        pinctrl-0 = <0x1e>;
                        status = "disabled";
                        #address-cells = <0x1>;


                i2c@01c2b400 {
                        compatible = "allwinner,sun6i-a31-i2c";
                        reg = <0x1c2b000 0x400>;
                        interrupts = <0x0 0x8 0x4>;
                        clocks = <0x2 0x3d>;
                        resets = <0x2 0x30>;
                        pinctrl-names = "default";
                        pinctrl-0 = <0x1f>;
                        status = "disabled";
                        #address-cells = <0x1>;
                        #size-cells = <0x0>;
                        linux,phandle = <0x56>;
                        phandle = <0x56>;
                };

 

...

    


                i2c@01f02400 {
                        compatible = "allwinner,sun6i-a31-i2c";
                        reg = <0x1f02400 0x400>;
                        interrupts = <0x0 0x2c 0x4>;
                        pinctrl-names = "default";
                        pinctrl-0 = <0x26>;
                        clocks = <0x23 0x6>;
                        clock-frequency = <0x186a0>;
                        resets = <0x25 0x6>;
                        status = "disabled";
                        #address-cells = <0x1>;
                        #size-cells = <0x0>;
                        linux,phandle = <0x5c>;
                        phandle = <0x5c>;
                };

...

                pinctrl@01f02c00 {
                        compatible = "allwinner,sun8i-h3-r-pinctrl";
                        reg = <0x1f02c00 0x400>;
                        interrupts = <0x0 0x2d 0x4>;
                        clocks = <0x23 0x0 0x9 0xb>;
                        clock-names = "apb", "hosc", "losc";
                        resets = <0x25 0x0>;
                        gpio-controller;
                        #gpio-cells = <0x3>;
                        interrupt-controller;
                        #interrupt-cells = <0x3>;
                        linux,phandle = <0x29>;
                        phandle = <0x29>;

                        ir@0 {
                                allwinner,pins = "PL11";
                                allwinner,function = "s_cir_rx";
                                allwinner,drive = <0x0>;
                                allwinner,pull = <0x0>;
                                linux,phandle = <0x5d>;
                                phandle = <0x5d>;
                        };

                        r_i2c@0 {
                                allwinner,pins = "PL0", "PL1";
                                allwinner,function = "s_twi";
                                allwinner,drive = <0x0>;
                                allwinner,pull = <0x0>;
                                linux,phandle = <0x26>;
                                phandle = <0x26>;
                        };


...

                                                               

 

and more ..

 

no clue how to solve the problem :(

 

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Borisbritwa

Borisbritwa

Posted
Posted

The maximum speed of spi for orange pi zero? My logical analyzer shows the maximum speed at SPI1_CLK/PA14 about 5  MHz It's not enough for me . This screen can work above 10 MHz. My settings in the program spi.open("/dev/spidev1.0", mode=0, delay=0, bits_per_word=8, speed=100000)  this is 100 MHz , but I have in reality only 5 MHz CLK.

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Borisbritwa

Borisbritwa

Posted
Posted

Here's what I found out maximum speed for SPI 33  MHz  this is defined in  script.bin .The next command, I set the SPI for speed 5MHz spi.open("/dev/spidev1.0", mode=0, delay=0, bits_per_word=8, speed=500000) . Speed is set in Hz and not in kHz,  as in the library wrote !!! When setting the speed above 6 megahertz, the screen starts to slow down .In reality, if the SPI speed is set to 10 Mhz, it starts to work worse than at 5 Mhz.

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Francesco Spossati

Francesco Spossati

Posted
Posted
On 15/12/2016 at 8:49 PM, martinayotte said:

For all my Oranges, I'm using https://github.com/duxingkei33/orangepi_PC_gpio_pyH3

Be aware that on PiZero, the STATUS_LED is not on PA15 but on PA17, therefore you will need to tweak mapping.h to change that.

 

Thank for this, now i know why it does not work. But it still not clear.

i change this:

    { "STATUS_LED", SUNXI_GPA(15), 2 },

to this

    { "STATUS_LED", SUNXI_GPA(17), 2 },

then i reinstall everything with  

python setup.py install

but it seems to be too fast, i think it did't recompile my mod.

Do i missing something?

 

THANK YOU!

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PoV

PoV

Posted
Posted

Hey! I just wanted to say thanks to martinayotte for patiently helping out. I was able to easily get the script here working on an Orange Pi One running a mainline Armbian:

 

https://forum.armbian.com/index.php?/topic/3084-orange-pi-zero-python-gpio-library/&do=findComment&comment=28706

 

I used this version of the library.

 

https://github.com/duxingkei33/orangepi_PC_gpio_pyH3

 

Installed it by following the instructions on that page. I already had GCC and `build-essentials` installed, but I did have to install the `python-dev` package before it would build though.

 

I was then able to modify the sample script to toggle PA12 high and low (just like the LED) to make a Piezo buzzer do its thing. Used the pinout here as reference.

 

http://linux-sunxi.org/Xunlong_Orange_Pi_One_%26_Lite

 

I just wanted to collect my notes all in one place. Thanks again. 

 

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chocomega

chocomega

Posted
Posted
On 5/5/2017 at 0:23 PM, maco1717 said:

Oh Wow! that's excelent. I got one more question tho.

 

Im looking for a similar method to use interrupt driven GPIO as in RPi.GPIO

 

GPIO.add_event_detect(pin_number, GPIO.BOTH, callback=callback_function)

 

Thanks.

 

 

 

 

 

On 5/23/2017 at 2:39 PM, pel.hu said:

I'm also looking for a RPi.GPIO compatible solution so I can use my python codes wriiten for raspis.
It's not only the lack of interrupts but all the setting commands are different.

If someone finds or writes one please share it here.

 

 

I found this library OPi.GPIO

https://github.com/rm-hull/OPi.GPIO

 

Quote

 

A drop-in replacement library for RPi.GPIO for the Orange Pi Zero. Only the basic GPIO functions are replicated, using sysfs: this allows the GPIO pins to be accessed from user space.

See the documentation for install instructions and detailed API usage.

 

 

Not sure if it uses interrupts but edge detection and eventing is working so far.

Pretty useful if you want to reuse code made with RPi.GPIO

 

Please note: 

Support for pull up / pull down resistors and switch debounce are not yet complete.

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jdugat

jdugat

Posted
Posted

I know most of the posts in this thread have to do with doing more complex things with the GPIO than what I want to do, but thought it would be a good place to ask (I hope) a simple question.

I have a OPiZero (with usb expansion board) connected to a web cam using motion. I've got everything working just find, however, every now and again the /dev/video0 or /dev/video1 (probably the usb camera) will decide  not to initialize and reboot will not correct the issue.  I have an ESP8266 connected to the battery supplying the OPiZero, so I can monitor it to make sure the battery doesn't get to low. The ESP8266 can shut the power off to the OPiZero with a simple relay inline with the usb power cable. What I'd like to be able to do is set a pin to high on the OPiZero and read it on the ESP8266, so it can cycle the power. 

 

I think this is possible, but I'm still fairly green on GPIO usage.  Can someone tell me which pin I could use to do something like this and would I be able to set the pin to a HIGH status with something as easy as a bash statement like echo out > gpio67/direction ?

 

Any help would be greatly appreciated!

 

Thanks.

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jdugat

jdugat

Posted
Posted

Sorry, then as per usual I confused everything.  All I want to do set a pin high on the GPIO that I can read on the ESP8266 using something like the python code below. I just don't know which of the GPIO pins on the OPiZ I can use.  Of course, I'll make sure that the GPIO pin is set to LOW when the OPiZ boots up.

 

 

import os
import sys

if not os.getegid() == 0:
    sys.exit('Script must be run as root')


from time import sleep
from pyA20.gpio import gpio
from pyA20.gpio import port
from pyA20.gpio import connector

__author__ = "Stefan Mavrodiev"
__copyright__ = "Copyright 2014, Olimex LTD"
__credits__ = ["Stefan Mavrodiev"]
__license__ = "GPL"
__version__ = "2.0"
__maintainer__ = __author__
__email__ = "support@olimex.com"

pin15 = connector.LEDp2    # This is the same as port.STATUS_LED

gpio.init()
gpio.setcfg(pin15, gpio.OUTPUT)
        sleep(2)

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