HW_Lib/sim/lvgl/lv_port_disp.cpp

/**
 * @file lv_port_disp_templ.c
 *
 */

/*Copy this file as "lv_port_disp.c" and set this value to "1" to enable content*/
#include <cstdio>
#include <easyx.h>
#if 1

/*********************
 *      INCLUDES
 *********************/
#include "lv_port_disp.h"
#include <stdbool.h>
#include "lvgl.h"

#include "sim_display.h"

/*********************
 *      DEFINES
 *********************/
#ifndef MY_DISP_HOR_RES
#define MY_DISP_HOR_RES    320
#endif

#ifndef MY_DISP_VER_RES
#define MY_DISP_VER_RES    240
#endif

/**********************
 *      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);
//static void gpu_fill(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);

/**********************
 *  STATIC VARIABLES
 **********************/

/**********************
 *      MACROS
 **********************/

/**********************
 *   GLOBAL FUNCTIONS
 **********************/

void lv_port_disp_init(void)
{
    /*-------------------------
     * Initialize your display
     * -----------------------*/
    disp_init();

    /*-----------------------------
     * Create a buffer for drawing
     *----------------------------*/

    /**
     * LVGL requires a buffer where it internally draws the widgets.
     * Later this buffer will passed to your display driver's `flush_cb` to copy its content to your display.
     * The buffer has to be greater than 1 display row
     *
     * There are 3 buffering configurations:
     * 1. Create ONE buffer:
     *      LVGL will draw the display's content here and writes it to your display
     *
     * 2. Create TWO buffer:
     *      LVGL 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 LVGL 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. Double buffering
     *      Set 2 screens sized buffers and set disp_drv.full_refresh = 1.
     *      This way LVGL will always provide the whole rendered screen in `flush_cb`
     *      and you only need to change the frame buffer's address.
     */

    /* Example for 1) */
    // static lv_disp_draw_buf_t draw_buf_dsc_1;
    // static lv_color_t buf_1[MY_DISP_HOR_RES * 10]; /*A buffer for 10 rows*/
    // lv_disp_draw_buf_init(&draw_buf_dsc_1, buf_1, NULL, MY_DISP_HOR_RES * 10); /*Initialize the display buffer*/

    // /* Example for 2) */
    // static lv_disp_draw_buf_t draw_buf_dsc_2;
    // static lv_color_t buf_2_1[MY_DISP_HOR_RES * 10]; /*A buffer for 10 rows*/
    // static lv_color_t buf_2_2[MY_DISP_HOR_RES * 10]; /*An other buffer for 10 rows*/
    // lv_disp_draw_buf_init(&draw_buf_dsc_2, buf_2_1, buf_2_2, MY_DISP_HOR_RES * 10); /*Initialize the display buffer*/

    /* Example for 3) also set disp_drv.full_refresh = 1 below*/
    static lv_disp_draw_buf_t draw_buf_dsc_3;
    static lv_color_t buf_3_1[MY_DISP_HOR_RES * MY_DISP_VER_RES]; /*A screen sized buffer*/
    static lv_color_t buf_3_2[MY_DISP_HOR_RES * MY_DISP_VER_RES]; /*Another screen sized buffer*/
    lv_disp_draw_buf_init(&draw_buf_dsc_3, buf_3_1, buf_3_2,
                          MY_DISP_VER_RES * MY_DISP_HOR_RES); /*Initialize the display buffer*/

    /*-----------------------------------
     * Register the display in LVGL
     *----------------------------------*/

    static 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 = MY_DISP_HOR_RES;
    disp_drv.ver_res = MY_DISP_VER_RES;

    /*Used to copy the buffer's content to the display*/
    disp_drv.flush_cb = disp_flush;

    /*Set a display buffer*/
    disp_drv.draw_buf = &draw_buf_dsc_3;

    /*Required for Example 3)*/
    //disp_drv.full_refresh = 1;

    /* Fill a memory array with a color if you have GPU.
     * Note that, in lv_conf.h you can enable GPUs that has built-in support in LVGL.
     * But if you have a different GPU you can use with this callback.*/
    //disp_drv.gpu_fill_cb = gpu_fill;

    /*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*/
    SIM_Display_INIT(MY_DISP_HOR_RES,MY_DISP_VER_RES, 0xffffff, BLACK, 1, false);
    SIM_Display_START();
}

volatile bool disp_flush_enabled = true;

/* Enable updating the screen (the flushing process) when disp_flush() is called by LVGL
 */
void disp_enable_update(void)
{
    disp_flush_enabled = true;
}

/* Disable updating the screen (the flushing process) when disp_flush() is called by LVGL
 */
void disp_disable_update(void)
{
    disp_flush_enabled = false;
}

void colortorgb24(lv_color_t* color_p, uint32_t* color, size_t len)
{
    while (len)
    {
        *color = RGB565_to_RGB888(color_p->full, false);
        color_p++;
        color++;
        len--;
    }
}

/*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)
{
    if (disp_flush_enabled)
    {
        /*The most simple case (but also the slowest) to put all pixels to the screen one-by-one*/
        uint32_t* color;
        size_t l = (area->x2 - area->x1) * (area->y2 - area->y1);
        color = (uint32_t*)malloc(sizeof(uint32_t) * l);

        colortorgb24(color_p, color, l);
        SIM_Color_FillFromBuffer(color, area->x1, area->y1, area->x2, area->y2);
        free(color);
    }

    /*IMPORTANT!!!
     *Inform the graphics library that you are ready with the flushing*/
    lv_disp_flush_ready(disp_drv);
}

/*OPTIONAL: GPU INTERFACE*/

/*If your MCU has hardware accelerator (GPU) then you can use it to fill a memory with a color*/
//static void gpu_fill(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*/
//    int32_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*/
//    }
//}


#else /*Enable this file at the top*/

/*This dummy typedef exists purely to silence -Wpedantic.*/
typedef int keep_pedantic_happy;
#endif