Description
I try to porting lvgl’s display driver and use disp_drv.full_refresh = 1;.However, for some reasons, the display memory of the LCD must be aligned at 64 bytes. This is not the same as the LVGL video memory arrangement. So I can’t directly use the LCD display setting as the LVGL display buffer. Two different buffer memory arrangements might look like the following:
They don’t have the same length in the x direction. Here is the code I implemented:
void lv_port_disp_init()
{
lv_color_t* buf_2_1 = malloc (screen_w * screen_h * sizeof(lv_color_t));
lv_color_t* buf_2_2 = malloc (screen_w * screen_h * sizeof(lv_color_t));
lv_disp_draw_buf_init(&draw_buf_dsc_2, buf_2_1, buf_2_2, screen_w * screen_h);
...
disp_drv.flush_cb = disp_flush;
...
}
static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
if(disp_flush_enabled) {
SURFACE* dst = get_target_buffer();
void* buff = dst->pixels;
int32_t y;
for(y = area->y1; y <= area->y2; y++) {
memcpy(buff, &(color_p->full), dst->pitch);
color_p += dst->w;
buff += dst->pitch;
}
flip();
}
lv_disp_flush_ready(disp_drv);
}
In disp_flush I must copy pixels line by line to LCD`s display buff, It’s too inefficient.
What MCU/Processor/Board and compiler are you using?
AMAZON2, GCC
What LVGL version are you using?
LVGL8.3
What do you want to achieve?
void lv_port_disp_init()
{
lv_color_t* buf_2_1 = get_lcd_display_buff1();
lv_color_t* buf_2_2 = get_lcd_display_buff2();
lv_disp_draw_buf_init(&draw_buf_dsc_2, buf_2_1, buf_2_2, screen_w * screen_h);
...
disp_drv.flush_cb = disp_flush;
...
}
static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
if(disp_flush_enabled) {
flip();
}
lv_disp_flush_ready(disp_drv);
}
- Direct use of LCD display
- Just ‘flip’ on refresh