How to config simulate communication such as i2c

[Chaoyue Ying]

I am trying to drive my OLED by nrf52833DK.

The OLED is offered by online shop that with a description that SSD1306.

I don't know whether the drive is offered in zephyr.So I want to use the drive offered by the owner of the shop.

The drive is a way that simulate i2c by gpio and the code is used in C51.

I think it is easy to use that only I change the pin and the way to drive pin.

But I am in trouble.

First, because it is simulate i2c and I think I need a overlay to define my OLED.

When I writting the compatible, the function that code auto-complete show a value that "gpio-i2c".It seem suited for me.So I write the overlay as follow:

/{
    OLED{
    compatible = "gpio-i2c";
    scl-gpios = <&gpio0 26 GPIO_ACTIVE_LOW>;
    sda_gpios = <&gpio0 27 GPIO_ACTIVE_LOW>;
    };
};

It is wrong to build.And it is puzzled me that should I drive the device by GPIO or I2C?

What if it was done in a similar way?

[Naeem Maroof]

Hello,

I don't know whether the drive is offered in zephyr.

I suggest you build the zephyr lvgl sample for the ssd1306 shield and see the compiled dts.

[Chaoyue Ying]

Thanks.The ssd1306 shield is suitable for me,but a new problem is the OLED still not be drived by iic.I don't know what caused it.If SDK have ssd1306 example?Where can I  find it?

[Naeem Maroof]

Yes, in the Nordic Connect SDK 2.6.0, create a new application by using LVGL sample

And then build it for your board using extra CMAKE argument for the Shield as shown below

After successful compilation, please check the overlay:

[Chaoyue Ying]

Hi, 你好,

I compilate successfully,but I don't know how the extra cmake argument and the drive work.Where can I learn more about it?我编译成功了，但是我

[Naeem Maroof]

Hi,

apology for delayed response.

extra CMAKE arguments can be set via CMakeLists or using the interface of VSCode that I have shown you.

For more information, please refer to the documentation for CMakeLists, or the information given in the samples that relate to the use of specific symbols.