Hi all. I have the code at the bottomrunning and producing this:
I am getting my feet wet in lvgl and am trying things just to try them out. I now want a chart in a flex column, but If I enable line 34 the application hangs and nothing gets rendered. Do you have any ideas why lv_chart_set_next_value(chart, ser1, (int32_t)lv_rand(10, 50)); would cause an infinite loop ( or recursion ).
I am building on Windows with mingw_64.
Any help is greatly appreciated.
Morten
Code:
#include <Windows.h>
#include "lvgl/lvgl.h"
#include "lvgl/examples/lv_examples.h"
#include "lvgl/demos/lv_demos.h"
#include <stdio.h>
#include <string>
static uint8_t cnt = 0;
lv_obj_t* createButton(int i , lv_obj_t* PARENT)
{
i+=64;
char text[30];
sprintf(text, "Button '%c'", i);
lv_obj_t * btn = lv_button_create( PARENT );
lv_obj_t * bllabel = lv_label_create(btn);
lv_label_set_text(bllabel, text);
lv_obj_center(bllabel);
return btn;
}
lv_obj_t* createChart(lv_obj_t* parent)
{
lv_obj_t * chart;
chart = lv_chart_create(parent);
lv_chart_set_type(chart, LV_CHART_TYPE_LINE);
lv_chart_set_point_count(chart, 10);
lv_chart_series_t * ser1 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_GREEN), LV_CHART_AXIS_PRIMARY_Y);
uint32_t i;
for(i = 0; i < 10; i++) {
//lv_chart_set_next_value(chart, ser1, (int32_t)lv_rand(10, 50)); // <<--- REMOVE AND IT WORKS
}
lv_chart_refresh(chart);
return chart;
}
int main()
{
lv_init();
int32_t zoom_level = 100;
bool allow_dpi_override = false;
bool simulator_mode = false;
lv_display_t* display = lv_windows_create_display(
L"LVGL Display Window",
800, 480,
zoom_level, allow_dpi_override, simulator_mode);
if (!display) return -1;
lv_lock();
lv_indev_t* pointer_device = lv_windows_acquire_pointer_indev(display);
if (!pointer_device) return -1;
lv_indev_t* keypad_device = lv_windows_acquire_keypad_indev(display);
if (!keypad_device) return -1;
lv_indev_t* encoder_device = lv_windows_acquire_encoder_indev(display);
if (!encoder_device) return -1;
const int rows = 4;
const int cols = 4;
lv_obj_t * row = lv_obj_create(lv_screen_active());
lv_obj_set_size(row, LV_PCT(100), LV_PCT(100));
lv_obj_set_pos(row, 0, 0); // ensure it starts at top-left
lv_obj_set_flex_flow(row, LV_FLEX_FLOW_ROW);
int buttonIndex = 1;
for ( int col = 0; col < cols; col++)
{
lv_obj_t * column = lv_obj_create(row);
lv_obj_set_flex_flow(column, LV_FLEX_FLOW_COLUMN);
lv_obj_set_flex_grow(column, 1);
lv_obj_set_height(column, LV_PCT(100));
lv_obj_set_scrollbar_mode(column, LV_SCROLLBAR_MODE_OFF);
for( int row = 0 ; row < rows; row++)
{
lv_obj_t *button;
button = createButton(col * rows + row + 1, column );
lv_obj_set_width(button, LV_PCT(100));
buttonIndex++;
}
lv_obj_t * textarea = lv_textarea_create(column);
lv_obj_set_width(textarea, LV_PCT(100));
lv_textarea_set_one_line(textarea, true);
lv_obj_t * chart = createChart(column);
lv_obj_set_width(chart, LV_PCT(100));
lv_obj_set_flex_grow(chart, 1);
}
lv_unlock();
while ( cnt < 10)
{
uint32_t time_till_next = lv_timer_handler();
if(time_till_next == LV_NO_TIMER_READY) time_till_next = LV_DEF_REFR_PERIOD;
lv_sleep_ms(time_till_next);
}
lv_obj_delete(row);
return 0;
}
