GFX library fonts

[Stas]

I want to use in my project tft 1.8 display with st7735 controller. I used the standard GFX example from SDK 14.1 and everything is working fine, but the picture is incorrectly displayed and I found only two fonts. Can I find additional fonts for the GFX library somewhere?

[Jakub Rzeszutko]

Hi,

We provided only these two fonts as there are available with license we can handle. You need to search the internet if you wish to have other fonts.

[faikab]

I use the dot factory to generate additional fonts for my display. They have a good amount of fonts available. I never used the GFX example from nordic though so you might have to do some slight alterations to make the generated output compatible. www.eran.io/.../

[Stas]

Thanks. Second problem for us is our display update very slow (without break image) with gfx example (maybe 300-500ms). We suppose the problem with gfx example. Is it correct that we have to clear display before send to it new info. And Im not telling now about images, just primitive object: circle, line, letters. Could you share your code for use nrf52 + st7735 display

[faikab]

Regarding clearing the display, yes you must do it as the LCD will save the previous drawing in RAM, However in order to save time i simply overwrite it rather than clearing then drawing, (assuming the next drawing is of the same size, otherwise i clear the extra portions and then overwrite the rest)

My algorithm takes way less than 300 ms to draw images and even less for primitive objects, but in my library i dont have any draw line or circles. I simply use fonts/letters & Icons (Bluetooth, Battery level, Company logo,...) What communication method do you use with your LCD? I uses 8080 Series communication and recently just switched to 4 Wire SPI ( but had to hack it by adding an external resistor to function with nordics sdk library) as the LCD SPI is non-conventional 4 wire (At least from my opinion)