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Description
What MCU/Processor/Board and compiler are you using?
MCU - MIMX RT1176
What LVGL version are you using?
8.3
What do you want to achieve?
We are receiving image hex data from UART and want to display images faster (like 3 images per second) without hanging or delay during runtime.
What have you tried so far?
- Copying received data to the image descriptor variable .data
lv_img_dsc_t img_des_;
memcpy((uint8_t *)img_des_.data, rcvdImgData, sizeof(rcvdImgData));
2 Tried lv_img_cache_invalidate_src(&img_des_);
3, Enabled
#define LV_MEM_CUSTOM 1
- #define LV_IMG_CACHE_DEF_SIZE 4
Code to reproduce
Add a code snippet which can run in the simulator. It should contain only the relevant code that compiles without errors when separated from your main code base.
The code block(s) should be formatted like:
void setup_scr_screen(lv_ui *ui)
{
//Write codes screen
ui->screen = lv_obj_create(NULL);
lv_obj_set_size(ui->screen, 800, 480);
lv_obj_set_scrollbar_mode(ui->screen, LV_SCROLLBAR_MODE_OFF);
//Write style for screen, Part: LV_PART_MAIN, State: LV_STATE_DEFAULT.
lv_obj_set_style_bg_opa(ui->screen, 255, LV_PART_MAIN|LV_STATE_DEFAULT);
lv_obj_set_style_bg_color(ui->screen, lv_color_hex(0xffffff), LV_PART_MAIN|LV_STATE_DEFAULT);
//LV_USE_PNG
lv_png_init();
arr = malloc(640*480*4);
if(arr == NULL)
{
while(1)
{
}
}
img_des_.header.cf = LV_IMG_CF_TRUE_COLOR_ALPHA;
img_des_.header.always_zero = 0;
img_des_.header.reserved = 0;
img_des_.header.w = 640;
img_des_.header.h = 480;
img_des_.data_size = 640*480*4;
img_des_.data = arr;
//Update current screen layout.
lv_obj_update_layout(ui->screen);
}
uint8_t screen_flag;
void change_screen(lv_ui *ui)
{
if(update) //when image data is received completely Set update flag =1
{
memcpy((uint8_t *)img_des_.data, rcvdImgData, sizeof(rcvdImgData)); //rcvdImgData = Recieved data from UART
ui->screen_img_1 = lv_img_create(ui->screen);
lv_obj_add_flag(ui->screen_img_1, LV_OBJ_FLAG_CLICKABLE);
lv_img_set_src(ui->screen_img_1, &img_des_);
lv_img_set_pivot(ui->screen_img_1, 50,50);
lv_img_set_angle(ui->screen_img_1, 0);
lv_obj_set_pos(ui->screen_img_1, 0, 0);
lv_obj_set_size(ui->screen_img_1, img_des_.header.w, img_des_.header.h);
lv_obj_set_scrollbar_mode(ui->screen_img_1, LV_SCROLLBAR_MODE_OFF);
//Write style for screen_img_1, Part: LV_PART_MAIN, State: LV_STATE_DEFAULT.
lv_obj_set_style_img_opa(ui->screen_img_1, 0, LV_PART_MAIN|LV_STATE_DEFAULT);
// Invalidate the cache of the image source
lv_img_cache_invalidate_src(&img_des_);
lv_img_set_src(ui->screen_img_1, &img_des_);
lv_obj_center(ui->screen_img_1);
lv_obj_set_style_img_opa(ui->screen_img_1, 255, LV_PART_MAIN|LV_STATE_DEFAULT);
lv_obj_update_layout(ui->screen);
update = 0;
recvFlag = 1;
SCB_EnableDCache(); //Disabled before recieving data from UART , Enable after image update
SCB_EnableICache();
}
if(screen_flag)
{
lv_obj_set_style_bg_color(ui->screen, lv_color_hex(0xffffff), LV_PART_MAIN|LV_STATE_DEFAULT);
}
}
Screenshot and/or video
If possible, add screenshots and/or videos about the current state.
Thanks
Akhil