Michel2/Tasmota
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Code Issues Releases Activity

LVGL option to prefer PSRAM for draw buffers using bit 5 (0x20) of :B in display.ini (#25120)

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s-hadinger authored and GitHub committed 2026-10-09 16:56:45 +02:00
1 parent 696fdb4bb2
commit 6b9855a49d
4 files changed
+15 -9
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CHANGELOG.md
+1 -1
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@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
## [15.6.0.3]
### Added
- LVGL option to prefer PSRAM for draw buffers using bit 5 (0x20) of `:B` in display.ini
### Breaking Changed
lib/lib_display/Display_Renderer-gemu-1.0/src/renderer.h
+1 -1
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@@ -37,7 +37,7 @@ typedef struct LVGL_PARAMS {
uint8_t async_dma : 1; // force DMA completion before returning, avoid conflict with other devices on same bus. If set you should make sure the display is the only device on the bus
uint8_t busy_invert : 1;
uint8_t invert_bw : 1;
uint8_t resvd_3 : 1;
uint8_t use_psram : 1; // bit 5 (0x20): prefer PSRAM for LVGL draw buffers (ex: ESP32-P4 DSI), falls back to internal RAM
uint8_t resvd_4 : 1;
uint8_t resvd_5 : 1;
};
lib/lib_display/UDisplay/include/uDisplay_SPI_panel.h
+1 -1
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@@ -23,7 +23,7 @@ typedef struct LVGL_PARAMS_t {
uint8_t async_dma : 1; // force DMA completion before returning, avoid conflict with other devices on same bus. If set you should make sure the display is the only device on the bus
uint8_t busy_invert : 1;
uint8_t invert_bw : 1;
uint8_t resvd_3 : 1;
uint8_t use_psram : 1; // bit 5 (0x20): prefer PSRAM for LVGL draw buffers (ex: ESP32-P4 DSI), falls back to internal RAM
uint8_t resvd_4 : 1;
uint8_t resvd_5 : 1;
};
tasmota/tasmota_xdrv_driver/xdrv_54_lvgl.ino
+12 -6
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@@ -481,12 +481,19 @@ void start_lvgl(const char * uconfig) {
if (0 == flushlines) flushlines = LV_BUFFER_ROWS;
lvgl_buffer_size = renderer->width() * flushlines;
// By default allocate preferably in internal memory which is faster than PSRAM.
// If bit 5 (0x20) of `:B` is set in display.ini, prefer PSRAM instead: this saves
// internal memory and can be faster with large flushlines on ESP32-P4 DSI panels.
// In both cases, fall back to the other memory type if allocation fails.
bool prefer_psram = renderer->lvgl_pars()->use_psram;
uint32_t caps_first = MALLOC_CAP_8BIT | (prefer_psram ? MALLOC_CAP_SPIRAM : MALLOC_CAP_INTERNAL);
uint32_t caps_second = MALLOC_CAP_8BIT;
const char * mem_pref = prefer_psram ? "PSRAM" : "main memory";
if (renderer->lvgl_pars()->use_dma) {
lvgl_buffer_size /= 2;
if (lvgl_buffer_size < 1000000) {
// allocate preferably in internal memory which is faster than PSRAM
AddLog(LOG_LEVEL_DEBUG, "LVG: Allocating buffer2 %i bytes in main memory (flushlines %i)", (lvgl_buffer_size * (LV_COLOR_DEPTH / 8)) / 1024, flushlines);
lvgl_glue->lv_pixel_buf2 = heap_caps_malloc_prefer(lvgl_buffer_size * (LV_COLOR_DEPTH / 8), 2, MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT);
AddLog(LOG_LEVEL_DEBUG, "LVG: Allocating buffer2 %i KB preferably in %s (flushlines %i)", (lvgl_buffer_size * (LV_COLOR_DEPTH / 8)) / 1024, mem_pref, flushlines);
lvgl_glue->lv_pixel_buf2 = heap_caps_malloc_prefer(lvgl_buffer_size * (LV_COLOR_DEPTH / 8), 2, caps_first, caps_second);
}
if (!lvgl_glue->lv_pixel_buf2) {
status_ok = false;
@@ -494,9 +501,8 @@ void start_lvgl(const char * uconfig) {
}
}
// allocate preferably in internal memory which is faster than PSRAM
AddLog(LOG_LEVEL_DEBUG, "LVG: Allocating buffer1 %i KB in main memory (flushlines %i)", (lvgl_buffer_size * (LV_COLOR_DEPTH / 8)) / 1024, flushlines);
lvgl_glue->lv_pixel_buf = heap_caps_malloc_prefer(lvgl_buffer_size * (LV_COLOR_DEPTH / 8), 2, MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT);
AddLog(LOG_LEVEL_DEBUG, "LVG: Allocating buffer1 %i KB preferably in %s (flushlines %i)", (lvgl_buffer_size * (LV_COLOR_DEPTH / 8)) / 1024, mem_pref, flushlines);
lvgl_glue->lv_pixel_buf = heap_caps_malloc_prefer(lvgl_buffer_size * (LV_COLOR_DEPTH / 8), 2, caps_first, caps_second);
if (!lvgl_glue->lv_pixel_buf) {
status_ok = false;
break;