damn got it now! finally. this is the sample code I got.

after setting HIGH to LOW in pinMode() of Arduino.cpp

 } else if (mode == OUTPUT) {
                if ((rv = gpio_direction_output(pin, LOW)) < 0) {
                        perror("gpio_direction_input");
                }
        }

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "TM1637.h"

int main() {
        int k;

        printf("Beginning to test program\n");

        uint8_t pinClk = 2;
        uint8_t pinData = 3;

        TM1637Display display(pinClk, pinData);
        uint8_t data[] = { 0xff, 0xff, 0xff, 0xff };
        display.setBrightness(0x0f);


        display.showNumberDec(153, false, 3, 1);
        sleep(2);

        printf("Goodbye\n");

        return 0;
}

@Maximilian-Gerhardt this should be added in the examples! looks amazing! thank you!

damn got it now! finally. this is the sample code I got.

after setting HIGH to LOW in pinMode() of Arduino.cpp

 } else if (mode == OUTPUT) {
                if ((rv = gpio_direction_output(pin, LOW)) < 0) {
                        perror("gpio_direction_input");
                }
        }

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "TM1637.h"

int main() {
        int k;

        printf("Beginning to test program\n");

        uint8_t pinClk = 2;
        uint8_t pinData = 3;

        TM1637Display display(pinClk, pinData);
        uint8_t data[] = { 0xff, 0xff, 0xff, 0xff };
        display.setBrightness(0x0f);


        display.showNumberDec(153, false, 3, 1);
        sleep(2);

        printf("Goodbye\n");

        return 0;
}

@Maximilian-Gerhardt awesome!! Fantastic job! I am glad it's working on to you.

@Maximilian-Gerhardt thanks! tried quick hacking the library, but no work.. my knowledge of writing data for this is still limited..

I am pretty sure I am using the correct device..

and the dock is this from that image, mine is quite different, the layout is different from the expansion.. I dont know why. don't have pins 21/20

@Maximilian-Gerhardt sorry for the long wait. I had some problems building the toolchain. anyway, after editing some environment variables from your makefile, tried building your repo, and compiling it successfully I guess.

$ make
mipsel-openwrt-linux-g++ -o tm1637_example_display -O3 -ggdb -g -Wall -Wextra -std=c++14 -I /home/docker-user/omega/source/staging_dir/target-mipsel_24kc_musl-1.1.16/usr/include -I /home/docker-user/omega/omega2-tm1637/omega_includes -L /home/docker-user/omega/source/staging_dir/target-mipsel_24kc_musl-1.1.16/usr/lib -L /home/docker-user/omega/omega2-tm1637/omega_libs -L. example_display.cpp TM1637.cpp Arduino.cpp  -loniondebug -lugpio
In file included from Arduino.cpp:3:0:
/home/docker-user/omega/omega2-tm1637/omega_includes/ugpio.h:57:39: warning: unused parameter 'gpio' [-Wunused-parameter]
 inline int gpio_is_valid(unsigned int gpio)
                                       ^
/home/docker-user/omega/omega2-tm1637/omega_includes/ugpio.h:73:39: warning: unused parameter 'gpio' [-Wunused-parameter]
 inline int gpio_cansleep(unsigned int gpio)

then after scp'ing to my omega, then running it.

Beginning to test program
> exporting gpio 8
> setting to input
> exporting gpio 9
> setting to input
> setting to input
> setting to input
> setting to input
> setting to input
> setting to input
t
Goodbye

unfortunately, there is nothing displayed..

btw, does

        uint8_t pinClk = 18;
        uint8_t pinData = 19;

needs to be 18 and 19? I don't have that.. I am using a power dock 1, not 2.. tried changing it to other GPIO, but still not working..

@Maximilian-Gerhardt got your repository, thanks! give me some few time to sort building the mips toolchain.. hopefully, my build will succeed.

@György-Farkas thanks for the tip!

@Maximilian-Gerhardt

こんにちは、honestly, I don't know how to thank you. if you can port that library, and doing something like display.setSegment() would really contribute a big value and great help among others too.. and I would be gladly to help testing it. this is my github if you plan to share it on github, invite me. thank you!

Greetings,

After working on for a few days and nights, I still don't get it.. I really sucks and noob. the concept of just switching the GPIO's is quite hard. I looked into the given libs to get some clue, but not progress.

this is the rough code that I got.

import time
import onionGpio

clk = 2
dio = 3

# gpioNum = 2
# gpioObj = onionGpio.OnionGpio(gpioNum)

clkObj = onionGpio.OnionGpio(clk)
dioObj = onionGpio.OnionGpio(dio)

clkObj.setOutputDirection(0)
dioObj.setOutputDirection(0)

## set to output
# status  = gpioObj.setOutputDirection(0)

## alternate the value
loop    = 1
value   = 1
while loop == 1:
    # clkObj.setOutputDirection(value)
    # dioObj.setOutputDirection(value)
    
    # reverse the value
    if value == 0:
        value = 1
    else:
        value = 1

    
    # set the new value
    # status  = gpioObj.setValue(value)
    # print 'GPIO%d set to: %d'%(gpioNum, value)

    print 'GPIO%d set to: %d val: %d %d'%(clk, clkObj.setValue(value), value, int(clkObj.getValue()))
    print 'GPIO%d set to: %d val: %d %d'%(dio, dioObj.setValue(value), value, int(clkObj.getValue()))


    time.sleep(5)

maybe programming web Softwares/Programs is different from here.. from that simple loop, something should happen, but I don't get anything.. I'm better of building web servers from golang/rust and crosscompile it to mips..

anyway, probably I can't just get this in a few days. will try to learn more from the internet.

@unique1984 thanks for the video, quite length full, but I will watch it. it looks to be a good start!

@Maximilian-Gerhardt thank you, that looks helpful. I will try it now.