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lvgl_helpers: Add comment about DISP_BUF_SIZE

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C47D 2021-02-07 17:55:20 -06:00
parent 9cd4a2d4c8
commit a1f23a0c80
1 changed files with 13 additions and 0 deletions
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lvgl_helpers.h
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@ -21,6 +21,19 @@ extern "C" {
/*********************
* DEFINES
*********************/
/* DISP_BUF_SIZE value doesn't have an special meaning, but it's the size
* of the buffer(s) passed to LVGL as display buffers. The default values used
* were the values working for the contributor of the display controller.
*
* As LVGL supports partial display updates the DISP_BUF_SIZE doesn't
* necessarily need to be equal to the display size.
*
* When using RGB displays the display buffer size will also depends on the
* color format being used, for RGB565 each pixel needs 2 bytes.
* When using the mono theme, the display pixels can be represented in one bit,
* so the buffer size can be divided by 8, e.g. see SSD1306 display size. */
#if defined (CONFIG_LV_TFT_DISPLAY_CONTROLLER_ST7789)
#define DISP_BUF_SIZE (LV_HOR_RES_MAX * 40)
#elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ST7735S