Unable to execute call function event in ui_events.c

How to
1

What do you want to achieve?

I have 2 buttons on my UI (Turn led on & Turn Led Off) in the generated ui_events.c file there is a pre-defined section for both button call function events with a section of commented out code saying “Your code here” when i place code here nothing happens and I get compile errors in the IDE

What have you tried so far?

Read multiple forums (here & lvgl) and searched multiple video tutorials

Hardware Etc

M5StackDial (ESP32)
Arduino IDE 2.3.4

ui_events.c

// This file was generated by SquareLine Studio
// SquareLine Studio version: SquareLine Studio 1.5.1
// LVGL version: 8.3.11
// Project name: SquareLine_Project

#include "ui.h"

void turnledon(lv_event_t * e)
{
	// Your code here
  digitalWrite(ledpin, HIGH);
}

void turnledoff(lv_event_t * e)
{
	// Your code here
  digitalWrite(ledpin, LOW);
}

ui.c

///////////////////// FUNCTIONS ////////////////////
void ui_event_Button1(lv_event_t * e)
{
    lv_event_code_t event_code = lv_event_get_code(e);

    if(event_code == LV_EVENT_PRESSED) {
        turnledon(e);
    }
}

void ui_event_Button2(lv_event_t * e)
{
    lv_event_code_t event_code = lv_event_get_code(e);

    if(event_code == LV_EVENT_PRESSED) {
        turnledoff(e);
    }
}

SimpleLed.ino

#include "Display_ST7789.h"
#include "LVGL_Driver.h"
#include "ui.h"

int ledpin = 9;

void setup()
{       
  
  LCD_Init();
  Lvgl_Init();
  ui_init();

  pinMode(ledpin, OUTPUT);

  
}

void loop()
{
  Timer_Loop();
  delay(5);
}

Compilation Errors

C:\Users\innovatum\Desktop\SimpleLed\ui_events.c: In function 'turnledon':
C:\Users\innovatum\Desktop\SimpleLed\ui_events.c:11:16: error: 'ledpin' undeclared (first use in this function)
   11 |   digitalWrite(ledpin, HIGH);
      |                ^~~~~~
C:\Users\innovatum\Desktop\SimpleLed\ui_events.c:11:16: note: each undeclared identifier is reported only once for each function it appears in
C:\Users\innovatum\Desktop\SimpleLed\ui_events.c: In function 'turnledoff':
C:\Users\innovatum\Desktop\SimpleLed\ui_events.c:17:16: error: 'ledpin' undeclared (first use in this function)
   17 |   digitalWrite(ledpin, LOW);
      |                ^~~~~~

exit status 1

Compilation error: 'ledpin' undeclared (first use in this function)
2

You have to declare the UI pins in ui.h. and/or also maybe where used: Here an example
// Digital IO Pin define
#define ledpin 9

pinMode(GPIO_INPUT_IO_9, OUTPUT);

Also the LED pin is not declared right, so the program does not know about the pin and hence not know what to do when button pressed

1 Like