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feature: lvgl performance tuning #39

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merged 3 commits into from
May 22, 2023
Merged

feature: lvgl performance tuning #39

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39ec404
zephyr: enable setting full_refresh bit for LVGL displays
danieldegrasse May 1, 2023
231ab54
zephyr: allow setting LVGL rendering buffer alignment
danieldegrasse May 1, 2023
c41dbc7
zephyr: allow placing LVGL rendering buffers into custom section
danieldegrasse May 1, 2023
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25 changes: 25 additions & 0 deletions zephyr/Kconfig.memory
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,31 @@ config LV_Z_DOUBLE_VDB
help
Use two buffers to render and flush data in parallel

config LV_Z_FULL_REFRESH
bool "Force full refresh mode"
help
Force full refresh of display on update. When combined with
LV_Z_VDB_SIZE, this setting can improve performance for display
controllers that require a framebuffer to be present in system memory,
since the controller can render the LVGL framebuffer directly

config LV_Z_VDB_ALIGN
int "Rending buffer alignment"
default 4
depends on LV_Z_BUFFER_ALLOC_STATIC
help
Rendering buffer alignment. Depending on chosen color depth,
buffer may be accessed as a uint8_t *, uint16_t *, or uint32_t *,
so buffer must be aligned to prevent unaligned memory access

config LV_Z_VBD_CUSTOM_SECTION
bool "Link rendering buffers to custom section"
depends on LV_Z_BUFFER_ALLOC_STATIC
help
Place LVGL rendering buffers in custom section, with tag ".lvgl_buf".
This can be used by custom linker scripts to relocate the LVGL
rendering buffers to a custom location, such as tightly coupled or
external memory.
choice
prompt "Rendering Buffer Allocation"
default LV_Z_BUFFER_ALLOC_STATIC
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17 changes: 15 additions & 2 deletions zephyr/lvgl.c
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Expand Up @@ -47,10 +47,19 @@ static lv_disp_draw_buf_t disp_buf;
* uint16_t * or uint32_t *, therefore buffer needs to be aligned accordingly to
* prevent unaligned memory accesses.
*/
static uint8_t buf0[BUFFER_SIZE] __aligned(4);
static uint8_t buf0[BUFFER_SIZE]
#ifdef CONFIG_LV_Z_VBD_CUSTOM_SECTION
Z_GENERIC_SECTION(.lvgl_buf)
#endif
__aligned(CONFIG_LV_Z_VDB_ALIGN);

#ifdef CONFIG_LV_Z_DOUBLE_VDB
static uint8_t buf1[BUFFER_SIZE] __aligned(4);
static uint8_t buf1[BUFFER_SIZE]
#ifdef CONFIG_LV_Z_VBD_CUSTOM_SECTION
Z_GENERIC_SECTION(.lvgl_buf)
#endif
__aligned(CONFIG_LV_Z_VDB_ALIGN);
#endif /* CONFIG_LV_Z_DOUBLE_VDB */

#endif /* CONFIG_LV_Z_BUFFER_ALLOC_STATIC */

Expand Down Expand Up @@ -353,6 +362,10 @@ static int lvgl_init(void)
lv_disp_drv_init(&disp_drv);
disp_drv.user_data = (void *)&disp_data;

#ifdef CONFIG_LV_Z_FULL_REFRESH
disp_drv.full_refresh = 1;
#endif

err = lvgl_allocate_rendering_buffers(&disp_drv);
if (err != 0) {
return err;
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