Demo_keypad error

abueno · May 29, 2020, 4:56pm

Description

I am trying to compile the lv_demo_keypad_encoder test, and I am getting compilation errors

What MCU/Processor/Board and compiler are you using?

CodeBlocks simulator with v7-dev (updated yesterday)

What do you want to achieve?

I want to test the lv_demo_keypad_encoder functionalities. When compiling, I get the error:

undefined reference to “mousewheel_read”.

I have checked that this function is not in the system, but I don’t know how to do it.

What have you tried so far?

I have installed SDL libraries and enable all the defines for MOUSE use.

abueno · May 29, 2020, 5:01pm

OK, for some reason the file mousewheel.c was not included in the project.

I have added it, and now the error is

SDL_MOUSEWHEEL undeclared
SDL_Event has no member named 'wheel'

I don’t know if something is missing, or this part is not finished yet…

Alex

Carlos_Diaz · May 29, 2020, 5:53pm

I’m not sure this is the rootcause of your problem but the lv_drivers repo have the mousewheel files, mousewheel_read is defined in mousewheel.h:

github.com

lvgl/lv_drivers/blob/a124106587512838c35b89b069e3b9fe1708bd25/indev/mousewheel.h#L61


* Initialize the encoder
*/
void mousewheel_init(void);

/**
* Get encoder (i.e. mouse wheel) ticks difference and pressed state
* @param indev_drv pointer to the related input device driver
* @param data store the read data here
* @return false: all ticks and button state are handled
*/
bool mousewheel_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data);

/**
* It is called periodically from the SDL thread to check a key is pressed/released
* @param event describes the event
*/
void mousewheel_handler(SDL_Event *event);

/**********************
*      MACROS
**********************/

I will try to take a look at the simulator repo, maybe it’s not pulling or adding the lv_driver directory to the CodeBlocks include search path.

Regards

Carlos_Diaz · May 30, 2020, 11:59pm

In the lv_ex_conf.h file you need to set LV_EX_MOUSEWHEEL to 1 like so for the mousewheel function to be defined, but I think you will also need to have SDL2 installed.

#define LV_EX_PRINTF       1       /*Enable printf-ing data in demoes and examples*/
#define LV_EX_KEYBOARD     1       /*Add PC keyboard support to some examples (`lv_drivers` repository is required)*/
#define LV_EX_MOUSEWHEEL   1       /*Add 'encoder' (mouse wheel) support to some examples (`lv_drivers` repository is required)*/

Then define the symbols USE_MOUSE, USE_MOUSEWHEEL and USE_KEYBOARD.

After that I had to install SDL2 in Windows, I followed this tutorial: https://www.youtube.com/watch?v=Gj3iXwvKmUY

And got the demo working
imagen

Hope this helps @abueno

abueno · June 1, 2020, 6:46pm

Maybe the problem is that I installed SDL instead of SDL2? I will try to look after it tomorrow when I have time

Thanks

Alex

Carlos_Diaz · June 1, 2020, 7:10pm

It may be, sure, let me know if you make it work.

abueno · June 2, 2020, 9:01am

Hi!

I have installed SDL2 and now it compiles fine. But when I execute the program, I cannot move the focus with the mouse or keyboard. I was expecting that the mousewheel changed focus. I have set a breakpoint in the mousewheel_handler function, and the SDL_MOUSEWHEEL event does not trigger whatever I do… any clues?

Alex

embeddedt · June 2, 2020, 11:33am

Have you registered the mousewheel driver like you do for the mouse (lv_indev_drv_register)?

abueno · June 3, 2020, 8:06am

I am using the example, and it just calls:

lv_indev_t * enc_indev = lv_indev_drv_register(&enc_drv);

I don’t know if I have to do anything else.

I don’t know if I have to initialize the SDL system. There is a call to

SDL_Init(SDL_INIT_VIDEO)

in monitor.c. I don’t know if I should initialize something similar for mousewheel…

Alex