undeclared (first use in this function)...

[pk84]

Hello,

I am going crazy, I always get the error that the structure Lcd_Ctx is not declared, while it is clearly declared (by including "stm32h750b_discovery_lcd.h").

With F3 I can find the structure declaration.

If I change the file from .c to .cpp the error is gone...

See screenshot below:

 

[MA4]

I think it's in stm32h745i_discovery_lcd.h, line 234: "extern BSP_LCD_Ctx_t Lcd_Ctx[];"

then he calls his .h in his .c file

[pk84 · Accepted solution]

oh, now I see the problem, thank you.

In the 745 h-file the variable is declared with extern Lcd_Ctx, and in the 750 h-file with LcdCtx ...

[pk84]

I have another similar question:

Why the compiler does not find lvgl.h, see screenshot below:

[MA4]

You need to write #include "../lvgl/lvgl.h" because ../ means exit the folder where your .c is.

So you exit User then lvgl is in the same level

[MA4]

Ok maybe I don't see well the picture, there is an other possibility

[MA4]

Right click on your project then go to properties-> C/C++ General -> Paths ans symbols and watch if the path of your folder with .h is in the list

[pk84]

ok that works, great, anyway it is not logical for me, because .c has two folders on top...

Still another similar failure, see screenshot below. What's wrong here?

 

[MA4]

I guess you add .h in a folder without .h in previously, can you check the path like I said in the previous message ?

[pk84]

now it works, thank you very much at all.