When a full screen refresh is done, apply a vertical scroll during the refresh. This makes the transition from one screen the another one smoother, even if the refresh rate is slow.

2 files changed, 195 insertions, 0 deletions

diff --git a/src/libs/lvgl b/src/libs/lvgl
deleted file mode 160000
-Subproject ee95d1c9cf74899585f9165458911f2d54ca750
diff --git a/src/libs/lvgl/porting/lv_port_disp_template.c b/src/libs/lvgl/porting/lv_port_disp_template.c
new file mode 100644
index 0000000..295dbe1
--- /dev/null
+++ b/src/libs/lvgl/porting/lv_port_disp_template.c
@@ -0,0 +1,195 @@
+/**
+ * @file lv_port_disp_templ.c
+ *
+ */
+
+ /*Copy this file as "lv_port_disp.c" and set this value to "1" to enable content*/
+#if 0
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_port_disp_templ.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static void disp_init(void);
+
+static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p);
+#if LV_USE_GPU
+static void gpu_blend(lv_color_t * dest, const lv_color_t * src, uint32_t length, lv_opa_t opa);
+static void gpu_fill(lv_color_t * dest, uint32_t length, lv_color_t color);
+#endif
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+void lv_port_disp_init(void)
+{
+    /*-------------------------
+     * Initialize your display
+     * -----------------------*/
+    disp_init();
+
+    /*-----------------------------
+     * Create a buffer for drawing
+     *----------------------------*/
+
+    /* LittlevGL requires a buffer where it draws the objects. The buffer's has to be greater than 1 display row
+     *
+     * There are three buffering configurations:
+     * 1. Create ONE buffer with some rows: 
+     *      LittlevGL will draw the display's content here and writes it to your display
+     * 
+     * 2. Create TWO buffer with some rows: 
+     *      LittlevGL will draw the display's content to a buffer and writes it your display.
+     *      You should use DMA to write the buffer's content to the display.
+     *      It will enable LittlevGL to draw the next part of the screen to the other buffer while
+     *      the data is being sent form the first buffer. It makes rendering and flushing parallel.
+     * 
+     * 3. Create TWO screen-sized buffer: 
+     *      Similar to 2) but the buffer have to be screen sized. When LittlevGL is ready it will give the
+     *      whole frame to display. This way you only need to change the frame buffer's address instead of
+     *      copying the pixels.
+     * */
+
+    /* Example for 1) */
+    static lv_disp_buf_t disp_buf_1;
+    static lv_color_t buf1_1[LV_HOR_RES_MAX * 10];                      /*A buffer for 10 rows*/
+    lv_disp_buf_init(&disp_buf_1, buf1_1, NULL, LV_HOR_RES_MAX * 10);   /*Initialize the display buffer*/
+
+    /* Example for 2) */
+    static lv_disp_buf_t disp_buf_2;
+    static lv_color_t buf2_1[LV_HOR_RES_MAX * 10];                        /*A buffer for 10 rows*/
+    static lv_color_t buf2_2[LV_HOR_RES_MAX * 10];                        /*An other buffer for 10 rows*/
+    lv_disp_buf_init(&disp_buf_2, buf2_1, buf2_2, LV_HOR_RES_MAX * 10);   /*Initialize the display buffer*/
+
+    /* Example for 3) */
+    static lv_disp_buf_t disp_buf_3;
+    static lv_color_t buf3_1[LV_HOR_RES_MAX * LV_VER_RES_MAX];            /*A screen sized buffer*/
+    static lv_color_t buf3_2[LV_HOR_RES_MAX * LV_VER_RES_MAX];            /*An other screen sized buffer*/
+    lv_disp_buf_init(&disp_buf_3, buf3_1, buf3_2, LV_HOR_RES_MAX * LV_VER_RES_MAX);   /*Initialize the display buffer*/
+
+
+    /*-----------------------------------
+     * Register the display in LittlevGL
+     *----------------------------------*/
+
+    lv_disp_drv_t disp_drv;                         /*Descriptor of a display driver*/
+    lv_disp_drv_init(&disp_drv);                    /*Basic initialization*/
+
+    /*Set up the functions to access to your display*/
+
+    /*Set the resolution of the display*/
+    disp_drv.hor_res = 480;
+    disp_drv.ver_res = 320;
+
+    /*Used to copy the buffer's content to the display*/
+    disp_drv.flush_cb = disp_flush;
+
+    /*Set a display buffer*/
+    disp_drv.buffer = &disp_buf_2;
+
+#if LV_USE_GPU
+    /*Optionally add functions to access the GPU. (Only in buffered mode, LV_VDB_SIZE != 0)*/
+
+    /*Blend two color array using opacity*/
+    disp_drv.gpu_blend = gpu_blend;
+
+    /*Fill a memory array with a color*/
+    disp_drv.gpu_fill = gpu_fill;
+#endif
+
+    /*Finally register the driver*/
+    lv_disp_drv_register(&disp_drv);
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/* Initialize your display and the required peripherals. */
+static void disp_init(void)
+{
+    /*You code here*/
+}
+
+/* Flush the content of the internal buffer the specific area on the display
+ * You can use DMA or any hardware acceleration to do this operation in the background but
+ * 'lv_disp_flush_ready()' has to be called when finished. */
+static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
+{
+    /*The most simple case (but also the slowest) to put all pixels to the screen one-by-one*/
+
+    int32_t x;
+    int32_t y;
+    for(y = area->y1; y <= area->y2; y++) {
+        for(x = area->x1; x <= area->x2; x++) {
+            /* Put a pixel to the display. For example: */
+            /* put_px(x, y, *color_p)*/
+            color_p++;
+        }
+    }
+
+    /* IMPORTANT!!!
+     * Inform the graphics library that you are ready with the flushing*/
+    lv_disp_flush_ready(disp);
+}
+
+
+/*OPTIONAL: GPU INTERFACE*/
+#if LV_USE_GPU
+
+/* If your MCU has hardware accelerator (GPU) then you can use it to blend to memories using opacity
+ * It can be used only in buffered mode (LV_VDB_SIZE != 0 in lv_conf.h)*/
+static void gpu_blend(lv_disp_drv_t * disp_drv, lv_color_t * dest, const lv_color_t * src, uint32_t length, lv_opa_t opa)
+{
+    /*It's an example code which should be done by your GPU*/
+    uint32_t i;
+    for(i = 0; i < length; i++) {
+        dest[i] = lv_color_mix(dest[i], src[i], opa);
+    }
+}
+
+/* If your MCU has hardware accelerator (GPU) then you can use it to fill a memory with a color
+ * It can be used only in buffered mode (LV_VDB_SIZE != 0 in lv_conf.h)*/
+static void gpu_fill_cb(lv_disp_drv_t * disp_drv, lv_color_t * dest_buf, lv_coord_t dest_width,
+                    const lv_area_t * fill_area, lv_color_t color);
+{
+    /*It's an example code which should be done by your GPU*/
+    uint32_t x, y;
+    dest_buf += dest_width * fill_area->y1; /*Go to the first line*/
+
+    for(y = fill_area->y1; y < fill_area->y2; y++) {
+        for(x = fill_area->x1; x < fill_area->x2; x++) {
+            dest_buf[x] = color;
+        }
+        dest_buf+=dest_width;    /*Go to the next line*/
+    }
+}
+
+#endif  /*LV_USE_GPU*/
+
+#else /* Enable this file at the top */
+
+/* This dummy typedef exists purely to silence -Wpedantic. */
+typedef int keep_pedantic_happy;
+#endif