1. 颜色深度

修改颜色深度为32bit。

#define LV_COLOR_DEPTH 32

2. 更新disp_init

修改GD32F450图层格式

static void disp_init(void)
{
    /*You code here*/
    lv_color_t *pTFTBuf = (lv_color_t *)GUI_TFT_BUF_START;
    tliLayer_t layer;
    layer.alpha = 0xFF;
    layer.bufAddr = (uint32_t)pTFTBuf;
    layer.defalutColor = 0x00FFFFFF;
    layer.format = FORMAT_ARGB8888;
    layer.x = 0;
    layer.y = 0;
    layer.w = TFT_WIDTH;
    layer.h = TFT_HEIGHT;
    tliLayerInit(0, layer, 1);
}

3. 更新disp_flush

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;
    lv_color_t *pTFTBuf = (lv_color_t *)GUI_TFT_BUF_START;
    //Printf("draw:(%d, %d) - (%d, %d)\n", area->x1, area->y1, area->x2, area->y2);
    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)*/
            (*(lv_color_t *)(pTFTBuf + y * TFT_WIDTH + x)).full = (*color_p).full;
            color_p++;
        }
    }

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

将颜色更新部分改为lv_color_t格式。

这时候发现颜色不对，显示效果还是很差。

调试这部分发现GD32F450使用SDRAM的情况下，SDRAM部分还有问题，导致显存数据不对，显示的效果才差。需要将SDRAM的时钟配置为3个HCLK。

4. 改为IPA更新数据

static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
    ipaBG_t bgSetting;
    ipaFG_t fgSetting;
    lv_color_t *pTFTBuf = (lv_color_t *)GUI_TFT_BUF_START;
    ipaSetConvertMode(IPA_CONVERT_MODE_DIRECT);
    bgSetting.addr = (uint32_t)pTFTBuf;
    bgSetting.preColor = 0xFF0000FF;
    bgSetting.xOffset = area->x1;
    bgSetting.yOffset = area->y1;
    bgSetting.w = (area->x2 - area->x1 + 1);
    bgSetting.h = (area->y2 - area->y1 + 1);
    ipaConfigBg(0, bgSetting);
    
    fgSetting.addr = (uint32_t)color_p;
    fgSetting.offset = 0;
    fgSetting.format = FORMAT_ARGB8888;
    fgSetting.alphaAlgorithm = 0;
    fgSetting.preColor = 0;
    
    fgSetting.w = (area->x2 - area->x1 + 1);
    fgSetting.h = (area->y2 - area->y1 + 1);
    ipaConfigFg(fgSetting);
    ipaEnable(1);

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

5. 死机问题

调试发现死机是增加Group（lv_indev_set_group(indev_keypad, groupRect);这句引起的）造成的。

    groupRect = lv_group_create();
    lv_indev_set_group(indev_keypad, groupRect);
    lv_group_add_obj(groupRect, obj1);
    lv_group_add_obj(groupRect, obj2);
    lv_group_add_obj(groupRect, obj3);