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Arduino H7 Video - LVGL9.X Double buffer is allocated but never used #1043

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#1050
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Arduino H7 Video - LVGL9.X Double buffer is allocated but never used#1043
#1050
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leonardocavagnis
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@thodorii

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@thodorii
thodorii
opened on Mar 27, 2025

Hi, I've been running into what seems to be memory issues causing an MBED OS crash with LVGL. I was looking around to see draw buffer allocations and ran into this code. I am confused on the purpose of the 2nd draw buffer malloc when it is never used, is this an oversight?

Additionally, should this malloc size be multiplied by sizeof(lv_color_t) for the ideal lvgl recommendation of 1/10th buffer size

@facchinm
 

ArduinoCore-mbed/libraries/Arduino_H7_Video/src/Arduino_H7_Video.cpp

Lines 108 to 130 in f7ff411

#if (LVGL_VERSION_MAJOR == 9)
/* Create a draw buffer */
static lv_color_t * buf1 = (lv_color_t*)malloc((width() * height() / 10)); /* Declare a buffer for 1/10 screen size */
if (buf1 == NULL) {
return 2; /* Insuff memory err */
}
static lv_color_t * buf2 = (lv_color_t*)malloc((width() * height() / 10)); /* Declare a buffer for 1/10 screen size */
if (buf2 == NULL) {
return 2; /* Insuff memory err */
}
lv_display_t *display;
if(_rotated) {
display = lv_display_create(height(), width());
lv_display_set_rotation(display, LV_DISPLAY_ROTATION_270);
//display->sw_rotate = 1;
} else {
display = lv_display_create(width(), height());
}
lv_display_set_buffers(display, buf1, NULL, width() * height() / 10, LV_DISPLAY_RENDER_MODE_PARTIAL); /*Initialize the display buffer.*/
lv_display_set_flush_cb(display, lvgl_displayFlushing);
lvgl_inc_thd.start(inc_thd);

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