本文来源电子发烧友社区，作者：soon顺soon，帖子地址：https://bbs.elecfans.com/jishu_2308754_1_1.html

感谢发烧友李先生分享【开鸿智谷NiobeU4开发板免费试用体验】移植LVGL本文参考成功移植，实现按键按下sw4显示SW4 Pressed松开显示SW4 Release，整理踩坑经验分享如下。

1.移植准备

1.1.lvgl源码获取

源码我选择从Gitee的littlevGL镜像标签页面中下载v8.3.1 链接 https://gitee.com/mirrors/lvgl/tags

下载完成将会有lvgl-v8.3.1.zip，将lvgl-v8.3.1.zip放到Ubuntu的家目录下，使用一下指令解压

unzip lvgl-v8.3.1.zip

1.2.新建demo目录并拷贝相关文件

在vendor/openvalley/niobeu4/demo/下新建目录302_lvgl，并将下载的lvgl-v8.3.1.zip解压后拷贝到目录下，
参考指令：

cd vendor/openvalley/niobeu4/demo/
cp -rf ~/lvgl-v8.3.1 ./302_lvgl

1.3.拷贝LCD驱动

拷贝vendor/openvalley/niobeu4/demo/107_hdf_spi下的所有文件到vendor/openvalley/niobeu4/demo/302_lvgl下，并拷贝显示模版驱动
参考指令：

cd vendor/openvalley/niobeu4/demo/
cp -rf 107_hdf_spi/. 302_lvgl/
cp -f 302_lvgl/examples/porting/lv_port_disp_template.c 302_lvgl/lv_port_disp.c
cp -f 302_lvgl/examples/porting/lv_port_disp_template.h 302_lvgl/lv_port_disp.h

1.3.拷贝配置文件

复制vendor/openvalley/niobeu4/demo/302_lvgl/lv_conf_template.h为vendor/openvalley/niobeu4/demo/302_lvgl//lv_conf.h
参考指令：

cd vendor/openvalley/niobeu4/demo/
cp -f 302_lvgl/lv_conf_template.h 302_lvgl/lv_conf.h

完成以上目录结构如图：

2.源码修改

2.1 配置make menuconfig相关信息

在vendor/openvalley/niobeu4/demo/Kconfig.liteos_m.applications最后添加

default "302_lvgl" if NIOBEU4_APPLICATION_302

修改vendor/openvalley/niobeu4/demo/302_lvgl/.application_config如下

config NIOBEU4_APPLICATION_302
    bool "302_lvgl"
    select DRIVERS
    select DRIVERS_HDF 
    select DRIVERS_HDF_PLATFORM
    select DRIVERS_HDF_CONFIG_MACRO
    select DRIVERS_HDF_PLATFORM_SPI
    select DRIVERS_HDF_PLATFORM_GPIO

2.2 显示相关lv_port_disp文件修改

vendor/openvalley/niobeu4/demo/302_lvgl/lv_port_disp.h中
将

#if 0

改为

#if 1

DEFINES下添加lv_conf.h所在路径配置和分辨率配置

/*********************
 *      DEFINES
 *********************/
#define LV_LVGL_H_INCLUDE_SIMPLE 1
#define MY_DISP_HOR_RES 135
#define MY_DISP_VER_RES 130

vendor/openvalley/niobeu4/demo/302_lvgl/lv_port_disp.c中
将

#if 0
#include "lv_port_disp_template.h"

改为

#if 1
#include "lv_port_disp.h"

添加

#include "st7735.h"

修改disp_init(void)加入LcdInit();

/*Initialize your display and the required peripherals.*/
static void disp_init(void)
{
    /*You code here*/
    LcdInit();
}

修改 lv_port_disp_init(void) 注释掉Example for 2)和 Example for 3) also set disp_drv.full_refresh = 1 below对应的代码

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 * LV_VER_RES_MAX);   /*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_1;

    /*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);
}

修改disp_flush()函数加入lcd_draw_point();和LcdPush();

/*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*/

        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)*/
                lcd_draw_point(x,y,color_p->full);
                color_p++;
            }
        }
        LcdPush();
    }

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

2.3 修改lv_tick_inc

此处修改方式与参考文件不同，此处修改如下
在vendor/openvalley/niobeu4/demo/302_lvgl/src/hal/lv_hal_tick.c中加入LOS_Msleep(tick_period);如下

/**
 * You have to call this function periodically
 * @param tick_period the call period of this function in milliseconds
 */
LV_ATTRIBUTE_TICK_INC void lv_tick_inc(uint32_t tick_period)
{
    tick_irq_flag = 0;
    sys_time += tick_period;
    LOS_Msleep(tick_period);
}

2.4 修改 lv_conf.h

在vendor/openvalley/niobeu4/demo/302_lvgl/lv_conf.h中
将

#if 0

改为

#if 1

另外因为以下编译error

暂时将

#define LV_USE_WIN        1

改为

#define LV_USE_WIN        0

2.5 编写测代码lvgl_example.c

可以将spi_example.c改成lvgl_example.c，也可直接新建一个lvgl_example.c文件，
lvgl_example.c内容如下

#include 
#include 
#include "stdint.h"
#include "los_task.h"
#include "ohos_run.h"
#include "lv_port_disp.h"
#include "lvgl.h"
#include "demos/lv_demos.h"
#include "esp_adc_cal.h"
#include "gpio_if.h"

#define PWR_SW_PIN_INDEX    2


void lv_tick_handle(UINT32 arg)
{
    printf("%s start tickrn", __FUNCTION__);
    while(1)
    {
        lv_tick_inc(50);
        lv_timer_handler();
    }
}

void lvgl_btn_test(void)
{
    int raw;
    UINT32 g_lv_time_task;
    TSK_INIT_PARAM_S task = { 0 };
    task.pfnTaskEntry = (TSK_ENTRY_FUNC)lv_tick_handle;
    task.pcName = "lv_time_task";
    task.uwStackSize = 0x1000;
    task.usTaskPrio = 25 - 1;

    GpioSetDir(PWR_SW_PIN_INDEX, GPIO_DIR_OUT);
    GpioWrite(PWR_SW_PIN_INDEX, 1);

    adc1_config_width(ADC_WIDTH_12Bit); 
    adc1_config_channel_atten(ADC1_CHANNEL_0, ADC_ATTEN_DB_11); 

    printf("[key_led] ADC initn");

    lv_init();
    lv_port_disp_init();
    //lv_log_register_print_cb(lv_log_print);
    LOS_TaskCreate(&g_lv_time_task, &task);

    lv_obj_t * btn_sw4 = lv_btn_create(lv_scr_act());     /*Add a button the current screen*/
    lv_obj_set_pos(btn_sw4, 10, 10);                            /*Set its position*/
    lv_obj_set_size(btn_sw4, 110, 25);                          /*Set its size*/

    lv_obj_t * label_sw4 = lv_label_create(btn_sw4);          /*Add a label to the button*/
    lv_obj_center(label_sw4);


    lv_obj_t * btn_sw5 = lv_btn_create(lv_scr_act());     /*Add a button the current screen*/
    lv_obj_set_pos(btn_sw5, 10, 60);                            /*Set its position*/
    lv_obj_set_size(btn_sw5, 110, 25);                          /*Set its size*/

    lv_obj_t * label_sw5 = lv_label_create(btn_sw5);          /*Add a label to the button*/
    lv_obj_center(label_sw5);

    while(1)
    {
        LOS_Msleep(200);
        lv_task_handler();
        raw = adc1_get_raw(ADC1_CHANNEL_0); 
        //printf("[key_led] raw: %dn", raw);
        if (raw < 100)
        {
            printf("[key_led] sw4 pressed raw: %dn", raw); 
            lv_label_set_text(label_sw4, "SW4 Pressed");                     /*Set the labels text*/

        }
        else if (raw >2000 && raw < 3000)
        {
            printf("[key_led] sw5 pressed raw: %dn", raw); 
            lv_label_set_text(label_sw5, "SW5 Pressed");                     /*Set the labels text*/

        } 
        else {
            lv_label_set_text(label_sw4, "SW4 Release");                     /*Set the labels text*/
            lv_label_set_text(label_sw5, "SW5 Release");                     /*Set the labels text*/
        }
    }
}
OHOS_APP_RUN(lvgl_btn_test);

2.6 编写BUILD.gn

vendor/openvalley/niobeu4/demo/302_lvgl/BUILD.gn

import("//kernel/liteos_m/liteos.gni")
assert(defined(LOSCFG_DRIVERS_HDF_CONFIG_MACRO), "Must Config LOSCFG_DRIVERS_HDF_CONFIG_MACRO in kernel/liteos_m menuconfig!")
assert(defined(LOSCFG_DRIVERS_HDF_PLATFORM_SPI), "Must Config LOSCFG_DRIVERS_HDF_PLATFORM_SPI in kernel/liteos_m menuconfig!")
module_name = get_path_info(rebase_path("."), "name")
kernel_module(module_name){
    sources = [
        "lvgl_example.c",
        "st7735s.c",
        "lv_port_disp.c",
        "src/core/lv_disp.c",
        "src/core/lv_event.c",
        "src/core/lv_group.c",
        "src/core/lv_indev_scroll.c",
        "src/core/lv_indev.c",
        "src/core/lv_obj_class.c",
        "src/core/lv_obj_draw.c",
        "src/core/lv_obj_pos.c",
        "src/core/lv_obj_scroll.c",
        "src/core/lv_obj_style_gen.c",
        "src/core/lv_obj_style.c",
        "src/core/lv_obj_tree.c",
        "src/core/lv_obj.c",
        "src/core/lv_refr.c",
        "src/core/lv_theme.c",
        "src/draw/sw/lv_draw_sw_arc.c",
        "src/draw/sw/lv_draw_sw_blend.c", 
        "src/draw/sw/lv_draw_sw_dither.c",   
        "src/draw/sw/lv_draw_sw_gradient.c",
        "src/draw/sw/lv_draw_sw_img.c",
        "src/draw/sw/lv_draw_sw_layer.c",
        "src/draw/sw/lv_draw_sw_letter.c",
        "src/draw/sw/lv_draw_sw_line.c",
        "src/draw/sw/lv_draw_sw_polygon.c",
        "src/draw/sw/lv_draw_sw_rect.c",
        "src/draw/sw/lv_draw_sw_transform.c",
        "src/draw/sw/lv_draw_sw.c",
        "src/draw/lv_draw_arc.c",
        "src/draw/lv_draw_img.c",   
        "src/draw/lv_draw_label.c",  
        "src/draw/lv_draw_layer.c",
        "src/draw/lv_draw_line.c",
        "src/draw/lv_draw_mask.c",
        "src/draw/lv_draw_rect.c",
        "src/draw/lv_draw_transform.c",
        "src/draw/lv_draw_triangle.c",
        "src/draw/lv_draw.c",
        "src/draw/lv_img_buf.c",
        "src/draw/lv_img_cache.c",
        "src/draw/lv_img_decoder.c",
        "src/font/lv_font_fmt_txt.c",
        "src/font/lv_font.c",
        "src/font/lv_font_montserrat_12.c",
        "src/font/lv_font_montserrat_14.c",
        "src/font/lv_font_montserrat_16.c",
        "src/hal/lv_hal_disp.c",
        "src/hal/lv_hal_indev.c",
        "src/hal/lv_hal_tick.c",
        "src/misc/lv_anim_timeline.c",
        "src/misc/lv_anim.c",
        "src/misc/lv_area.c",
        "src/misc/lv_async.c",
        "src/misc/lv_bidi.c",
        "src/misc/lv_color.c",
        "src/misc/lv_fs.c",
        "src/misc/lv_gc.c",
        "src/misc/lv_ll.c",
        "src/misc/lv_log.c",
        "src/misc/lv_lru.c",
        "src/misc/lv_math.c",
        "src/misc/lv_mem.c",
        "src/misc/lv_printf.c",
        "src/misc/lv_style_gen.c",
        "src/misc/lv_style.c",
        "src/misc/lv_templ.c",
        "src/misc/lv_timer.c",
        "src/misc/lv_tlsf.c",
        "src/misc/lv_txt_ap.c",
        "src/misc/lv_txt.c",
        "src/misc/lv_utils.c",
        "src/widgets/lv_arc.c",
        "src/widgets/lv_bar.c",
        "src/widgets/lv_btn.c",
        "src/widgets/lv_btnmatrix.c",
        "src/widgets/lv_canvas.c",
        "src/widgets/lv_checkbox.c",
        "src/widgets/lv_dropdown.c",
        "src/widgets/lv_img.c",
        "src/widgets/lv_label.c",
        "src/widgets/lv_line.c",
        "src/widgets/lv_objx_templ.c",
        "src/widgets/lv_roller.c",
        "src/widgets/lv_slider.c",  
        "src/widgets/lv_switch.c",           
        "src/widgets/lv_table.c", 
        "src/widgets/lv_textarea.c",
        "src/extra/themes/basic/lv_theme_basic.c",
        "src/extra/themes/default/lv_theme_default.c",
        "src/extra/themes/mono/lv_theme_mono.c",
        "src/extra/widgets/animimg/lv_animimg.c",
        "src/extra/widgets/calendar/lv_calendar_header_arrow.c",
        "src/extra/widgets/calendar/lv_calendar_header_dropdown.c",
        "src/extra/widgets/calendar/lv_calendar.c",
        "src/extra/widgets/chart/lv_chart.c",
        "src/extra/widgets/colorwheel/lv_colorwheel.c",
        "src/extra/widgets/imgbtn/lv_imgbtn.c",
        "src/extra/widgets/keyboard/lv_keyboard.c",
        "src/extra/widgets/led/lv_led.c",
        "src/extra/widgets/list/lv_list.c",
        "src/extra/widgets/menu/lv_menu.c",
        "src/extra/widgets/meter/lv_meter.c",
        "src/extra/widgets/msgbox/lv_msgbox.c",
        "src/extra/widgets/span/lv_span.c",
        "src/extra/widgets/spinbox/lv_spinbox.c",
        "src/extra/widgets/spinner/lv_spinner.c",
        "src/extra/widgets/tabview/lv_tabview.c",
        "src/extra/widgets/tileview/lv_tileview.c",
        "src/extra/widgets/win/lv_win.c",
        "src/extra/layouts/flex/lv_flex.c",
        "src/extra/layouts/grid/lv_grid.c",
        "src/extra/lv_extra.c",
        "src/extra/libs/png/lodepng.c",
        "src/extra/libs/png/lv_png.c",
        "demos/stress/lv_demo_stress.c",

    ]
    include_dirs = [
        "//drivers/hdf_core/framework/include/platform/",
        "//drivers/hdf_core/framework/include/utils/",
        "//drivers/hdf_core/framework/support/platform/include/adc",
        "//drivers/hdf_core/framework/support/platform/include/spi",
        "//drivers/hdf_core/adapter/khdf/liteos_m/osal/include/",
        "//drivers/hdf_core/framework/include/core/",
        "//drivers/hdf_core/framework/include/osal/",
        "//device/soc/esp/esp32/components/esp_adc_cal/include/",
        "//device/soc/esp/esp32/components/driver/esp32/include/",
        "/src",
        "."
    ]
}

3 编译测试

3.1 编译

进入//kernel/liteos_m目录, 执行指令

make menuconfig

在menuconfig配置中进入如下选项:
(Top) → Platform → Board Selection → select board niobeu4 → use openvalley niobeu4 application → niobeu4 application choose
选择302_lvgl