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cyneer
cyneer
Associate II
March 6, 2019
Question

How to put a string on screen in code? Like the "printf" fun.

  • March 6, 2019
  • 2 replies
  • 1797 views

HI,I'm New to C++,and I'm trying to using TouchGFX for my interface UI Demo,Now I'm trying to creat a Text Wigdet total by code,and make is to supprot TFT files,other than use the Designer to draw and creat a string list.That is,write someting like "printf" and then it show message on the LCD screen.

How could I start to handle this work!? Thanks.

0690X0000087XyFQAU.png

if I use my own tag ,it will auto removed by designer,Wish for you help!

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2 replies

Vangelis Fortounas
Vangelis Fortounas
Associate II
March 6, 2019

hello!

redefine the function int fputc (int c, FILE * stream) declared in stdio.h to retarget the prinf output, like this

int fputc (int c, FILE * stream)

{

//your code to print a character to screen goes here

return c;

}

fputs called by printf fuction internaly.

cyneer
cyneerAuthor
Associate II
March 6, 2019

Thank you!

Actually what I wanna know is how to use the touchGFX  function interface about Load Fonts.I'm confused about this .Now I have used the reload functions in (LCD.hpp) to draw dots or Lines.

I just use the designer to place the text area,then the TouchGFX designer 4.10 creat C++ code to show the font in lcd screen.

I want to use my HAL fun then I create touchgfx::myTexts, someting like class touchgfx::Texts, then I change the font array point to place order by unicode in *.TFT files,but it didn't work.cause the HAL fun aways call the  touchgfx::Texts::setLanguage,other than my function inter face

the func I want to repass my parameters is the following one:

void registerTypedTextDatabase(const TypedTextData* data, const Font* const* f, const uint16_t n)

I don't kown weather I have make it cleare.Any how ,thank you for your time!

Oscar_Niño
Oscar_Niño
Associate II
March 10, 2020

Hi Cyneer

Did you know how create a text by code? Im creating an application for stm32f746-disco board(by now) that works as coprocessor so the final screen isn´t defined, it is created in real time by uart commands so i need to add text or image or figures in real time, I have resolved image by array of image objects but text i can´t yet. Any advise?

Best Regards

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