GfxLCD and drawing a text

Finally, something that is missingΒ from the start, the ability to write some text on display. In Doton we needed an ability to display numbers and we have done it via images. It was a partial solution but good enough. But we want more πŸ™‚

So this time fonts, text and another step in endless struggle with displaying anything anywhere πŸ™‚


GfxLCD – rotate SSD1306 and NJU6450

We can rotate both ILI displays but NJU and SSD are awaiting their turn. Let’s give them some attention and add rotation to them.
This will close another task on endless list of improvements πŸ™‚
From what I see we should change drawing functions (recalculate coordinates) and flushing buffer should stay the same because it works directly on hardware.


GfxLCD tests and fixes – page drawing

We need tests for GfxLCD and we need it now! But this is a driver so what can we test? W can and must test all drawing functions. We have two algorithms the page and the area. Let’ begin with page one.
We can mock a chip class in such way that it won’t use a driver and all drawing would go to a buffer and we always can check if buffer looks as we want.


Raspberry PI, GfxLCD and ILI9486

Recently I bought an LCD 4″ IPS with an ILI9486 chip from Waveshare. It should be better than 2.8″ πŸ™‚ In instruction states that this display can work as system screen and I thought that maybe we can use PyQt or something instead of a custom driver.
The idea died quickly. I tried to run it on Raspberry Pi Zero W and this is not trivial πŸ™‚ First, I hit the bug with inability to use GPIO #17 and driver couldn’t be loaded. After some googling, I know that this is caused by the newest kernel. So I reverted to old one and… screen booted up but WiFi and Bluetooth did not.
So this way is no go. Back to the original idea and custom driver for ILI9486.

Raspberry Pi and package for graphical LCDs – GfxLCD

It took some time but finally, we can exclude GfxLCD package from The Doton project. After this, we may focus on the next stage of Doton project.

But back to now:) We need to create a new package and publish it on the PyPi.

pip install gfxlcd

GfxLCD on PyPi
Old code, before module extraction, is under tag before-split. This way old posts still have some sense:)


Raspberry Pi and area drawing on ILI9325

In previous three articles, we managed to create a united interface for NJU and SSD based LCD. Today we will add another LCD, the most important one, with ILI9325 chip and 240×320 size.
This one brings a new way of drawing. Not on pages but on pixels and with colours.
Page drawing:
part one
part two
part three

Source @ GitHub