本文来源电子发烧友社区，作者：李先生， 帖子地址：https://bbs.elecfans.com/jishu_2307453_1_1.html


前言

本开发板带一个135x130的TFT屏幕,使用的控制器是ST7735,SPI接口,16位。前两篇已经进行了屏幕的显示测试,具备了移植GUI的条件,本篇我们移植LVGL。

参考

https://lvgl.io/

准备代码

cd niobeu4_src/vendor/openvalley/niobeu4/demo/107_hdf_spi/

git clonehttps://github.com/lvgl/lvgl.git

移植概述

配置文件lv_conf.h

复制

lvgl/lv_conf_template.h

为

lvgl/lv_conf.h

将#if 0改为1,即直接#include “lv_conf.h”

将lv_conf.h添加到工程头文件包含路径。

即修改

vendor/openvalley/niobeu4/demo/107_hdf_spi/BUILD.gn

include_dirs = [

下添加一行"lvgl/",

底层驱动模板

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/examples/porting

下有对应的模板文件,分别是显示,文件系统和输入设备的驱动模板。

lv_port_disp_template.c/h

lv_port_fs_template.c/h

lv_port_indev_template.c/h

暂时只移植显示,所以复制lv_port_disp_template.c/h

到vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl下改名字为

lv_port_disp.c/h

将.c和.h里面的#if 0改为1

.c中#include "lv_port_disp_template.h"改为#include "lv_port_disp.h"

HAL层模板

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/src/hal

下

我们直接使用不修改

lv_hal_disp.c/h

lv_hal_indev.c/h

lv_hal_tick.c/h

lv_hal.h

添加文件

见工程配置,在gn文件中添加源码。

需要移植的代码

移植比较简单,直接使用底层驱动模板根据实际实现修改lv_port_disp.c,并配置lv_conf.h即可。

头文件包含模式

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_port_disp.h中

#define LV_LVGL_H_INCLUDE_SIMPLE 1

这样需要将lv_conf.h所在路径配置为工程头文件包含路径。

代码中直接#include "lvgl.h"

否则是#include "../../lvgl.h"

分辨率配置

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_port_disp.h中

#define MY_DISP_HOR_RES 135

#define MY_DISP_VER_RES 130

初始化

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_port_disp.c中

实现disp_init

即调用自己的初始化函数LcdInit

缓冲区

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_port_disp.c中

lv_port_disp_init

注释掉/* Example for 2) */

/* Example for 3) also set disp_drv.full_refresh = 1 below*/对应的代码

使用/* Example for 1) */

lv_port_disp_init

改函数调用disp_init

调用LcdInit实现初始化

刷新显示

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_port_disp.c中

disp_flush

/*put_px(x, y,color_p)/改为

lcd_draw_point(x,y,color_p->full);

并调用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);

}

颜色深度

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_conf.h中

#define LV_COLOR_DEPTH 16

typedef LV_CONCAT3(lv_color, LV_COLOR_DEPTH, _t) lv_color_t;

则lv_color_t类型为lv_color_16_t

堆大小配置

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_conf.h中

#define LV_MEM_SIZE (10U * 1024U) /[bytes]/

按需提供堆大小,过大可能编译不过,过小可能影响创建对象。

时间滴答

如果LV_TICK_CUSTOM为1则需要用户提供相关接口

LV_TICK_CUSTOM_SYS_TIME_EXPR用于获取当前毫秒值

和头文件LV_TICK_CUSTOM_INCLUDE

在lv_conf.h中指定

否则使用lvgl/src/hal/lv_hal_tick.c的实现

每隔x毫秒调用lv_tick_inc(x),使用内部计数器定时。

周期调用lv_tick_inc更新时间滴答,比如专门在某个定时线程中

while(1)

{

LOS_Msleep(5);   /*Sleep for 5 millisecond*/

    lv_tick_inc(5);

lv_timer_handler();

}

日志

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_conf.h中

#define LV_USE_LOG 0

改为

#define LV_USE_LOG 1使能日志

#define LV_LOG_LEVEL LV_LOG_LEVEL_TRACE设置日志,等级

LV_LOG_LEVEL_TRACE表示所有信息都打印

如果#define LV_LOG_PRINTF 0

则需要调用设置lv_log_register_print_cb()打印函数

否则使用printf,我们这里实现了printf所以设置为1

#define LV_LOG_USE_TIMESTAMP 1

使能打印时间

其他的模块打印使能

#define LV_LOG_TRACE_MEM        1

#define LV_LOG_TRACE_TIMER      1

#define LV_LOG_TRACE_INDEV      1

#define LV_LOG_TRACE_DISP_REFR  1

#define LV_LOG_TRACE_EVENT      1

#define LV_LOG_TRACE_OBJ_CREATE 1

#define LV_LOG_TRACE_LAYOUT     1

#define LV_LOG_TRACE_ANIM       1

字体配置

vendor/openvalley/niobeu4/demo/107_hdf_spi/lvgl/lv_conf.h

中按需使能对应的字体,如果有对应编译错误信息根据提示使能

#define LV_FONT_MONTSERRAT_12 1

#define LV_FONT_MONTSERRAT_14 1

#define LV_FONT_MONTSERRAT_16 1

工程配置

vendor/openvalley/niobeu4/demo/107_hdf_spi/BUILD.gn中添加源码和头文件包含路径。

kernel_module(module_name){

sources = [

    "spi_example.c",

    "st7735s.c",

    "lvgl/src/core/lv_disp.c",

    "lvgl/src/core/lv_event.c",

    "lvgl/src/core/lv_group.c",

    "lvgl/src/core/lv_indev_scroll.c",

    "lvgl/src/core/lv_indev.c",

    "lvgl/src/core/lv_obj_class.c",

    "lvgl/src/core/lv_obj_draw.c",

    "lvgl/src/core/lv_obj_pos.c",

    "lvgl/src/core/lv_obj_scroll.c",

    "lvgl/src/core/lv_obj_style_gen.c",

    "lvgl/src/core/lv_obj_style.c",

    "lvgl/src/core/lv_obj_tree.c",

    "lvgl/src/core/lv_obj.c",

    "lvgl/src/core/lv_refr.c",

    "lvgl/src/core/lv_theme.c",



    "lvgl/src/draw/sw/lv_draw_sw_arc.c",

    "lvgl/src/draw/sw/lv_draw_sw_blend.c", 

    "lvgl/src/draw/sw/lv_draw_sw_dither.c",   

    "lvgl/src/draw/sw/lv_draw_sw_gradient.c",

    "lvgl/src/draw/sw/lv_draw_sw_img.c",

    "lvgl/src/draw/sw/lv_draw_sw_layer.c",

    "lvgl/src/draw/sw/lv_draw_sw_letter.c",

    "lvgl/src/draw/sw/lv_draw_sw_line.c",

    "lvgl/src/draw/sw/lv_draw_sw_polygon.c",

    "lvgl/src/draw/sw/lv_draw_sw_rect.c",

    "lvgl/src/draw/sw/lv_draw_sw_transform.c",

    "lvgl/src/draw/sw/lv_draw_sw.c",

    "lvgl/src/draw/lv_draw_arc.c",

    "lvgl/src/draw/lv_draw_img.c",   

    "lvgl/src/draw/lv_draw_label.c",  

    "lvgl/src/draw/lv_draw_layer.c",

    "lvgl/src/draw/lv_draw_line.c",

    "lvgl/src/draw/lv_draw_mask.c",

    "lvgl/src/draw/lv_draw_rect.c",

    "lvgl/src/draw/lv_draw_transform.c",

    "lvgl/src/draw/lv_draw_triangle.c",

    "lvgl/src/draw/lv_draw.c",

    "lvgl/src/draw/lv_img_buf.c",

    "lvgl/src/draw/lv_img_cache.c",

    "lvgl/src/draw/lv_img_decoder.c",



    "lvgl/src/font/lv_font_fmt_txt.c",

    "lvgl/src/font/lv_font.c",

    "lvgl/src/font/lv_font_montserrat_12.c",

    "lvgl/src/font/lv_font_montserrat_14.c",

    "lvgl/src/font/lv_font_montserrat_16.c",



    "lvgl/src/hal/lv_hal_disp.c",

    "lvgl/src/hal/lv_hal_indev.c",

    "lvgl/src/hal/lv_hal_tick.c",



    "lvgl/src/layouts/flex/lv_flex.c",

    "lvgl/src/layouts/grid/lv_grid.c",



    "lvgl/src/libs/bmp/lv_bmp.c",

    "lvgl/src/libs/ffmpeg/lv_ffmpeg.c",

    "lvgl/src/libs/freetype/lv_freetype.c",

    "lvgl/src/libs/fsdrv/lv_fs_fatfs.c",

    "lvgl/src/libs/fsdrv/lv_fs_posix.c",

    "lvgl/src/libs/fsdrv/lv_fs_stdio.c",

    "lvgl/src/libs/fsdrv/lv_fs_win32.c",

    "lvgl/src/libs/gif/gifdec.c",

    "lvgl/src/libs/gif/lv_gif.c",

    "lvgl/src/libs/png/lodepng.c",

    "lvgl/src/libs/png/lv_png.c",

    "lvgl/src/libs/qrcode/lv_qrcode.c",

    "lvgl/src/libs/qrcode/qrcodegen.c",

    "lvgl/src/libs/rlottie/lv_rlottie.c",

    "lvgl/src/libs/sjpg/lv_sjpg.c",

    "lvgl/src/libs/sjpg/tjpgd.c",



    "lvgl/src/misc/lv_anim_timeline.c",

    "lvgl/src/misc/lv_anim.c",

    "lvgl/src/misc/lv_area.c",

    "lvgl/src/misc/lv_async.c",

    "lvgl/src/misc/lv_bidi.c",

    "lvgl/src/misc/lv_color.c",

    "lvgl/src/misc/lv_fs.c",

    "lvgl/src/misc/lv_gc.c",

    "lvgl/src/misc/lv_ll.c",

    "lvgl/src/misc/lv_log.c",

    "lvgl/src/misc/lv_lru.c",

    "lvgl/src/misc/lv_malloc_builtin.c",

    "lvgl/src/misc/lv_math.c",

    "lvgl/src/misc/lv_mem.c",

    "lvgl/src/misc/lv_memcpy_builtin.c",

    "lvgl/src/misc/lv_printf.c",

    "lvgl/src/misc/lv_style_gen.c",

    "lvgl/src/misc/lv_style.c",

    "lvgl/src/misc/lv_templ.c",

    "lvgl/src/misc/lv_timer.c",

    "lvgl/src/misc/lv_tlsf.c",

    "lvgl/src/misc/lv_txt_ap.c",

    "lvgl/src/misc/lv_txt.c",

    "lvgl/src/misc/lv_utils.c",



    "lvgl/src/others/file_explorer/lv_file_explorer.c",

    "lvgl/src/others/fragment/lv_fragment_manager.c",

    "lvgl/src/others/fragment/lv_fragment.c",

    "lvgl/src/others/gridnav/lv_gridnav.c",

    "lvgl/src/others/ime/lv_ime_pinyin.c",

    "lvgl/src/others/imgfont/lv_imgfont.c",

    "lvgl/src/others/monkey/lv_monkey.c",

    "lvgl/src/others/msg/lv_msg.c",

    "lvgl/src/others/snapshot/lv_snapshot.c",



    "lvgl/src/themes/basic/lv_theme_basic.c",

    "lvgl/src/themes/default/lv_theme_default.c",

    "lvgl/src/themes/mono/lv_theme_mono.c",



    "lvgl/src/widgets/windows/lv_win.c",

    "lvgl/src/widgets/animimg/lv_animimg.c",

    "lvgl/src/widgets/arc/lv_arc.c",

    "lvgl/src/widgets/bar/lv_bar.c",

    "lvgl/src/widgets/btn/lv_btn.c",

    "lvgl/src/widgets/btnmatrix/lv_btnmatrix.c",

    "lvgl/src/widgets/calendar/lv_calendar_header_arrow.c",

    "lvgl/src/widgets/calendar/lv_calendar_header_dropdown.c",

    "lvgl/src/widgets/calendar/lv_calendar.c",

    "lvgl/src/widgets/canvas/lv_canvas.c",

    "lvgl/src/widgets/chart/lv_chart.c",

    "lvgl/src/widgets/checkbox/lv_checkbox.c",

    "lvgl/src/widgets/colorwheel/lv_colorwheel.c",

    "lvgl/src/widgets/dropdown/lv_dropdown.c",

    "lvgl/src/widgets/img/lv_img.c",

    "lvgl/src/widgets/imgbtn/lv_imgbtn.c",

    "lvgl/src/widgets/keyboard/lv_keyboard.c",

    "lvgl/src/widgets/label/lv_label.c",

    "lvgl/src/widgets/led/lv_led.c",

    "lvgl/src/widgets/line/lv_line.c",

    "lvgl/src/widgets/list/lv_list.c",

    "lvgl/src/widgets/menu/lv_menu.c",

    "lvgl/src/widgets/meter/lv_meter.c",

    "lvgl/src/widgets/msgbox/lv_msgbox.c",

    "lvgl/src/widgets/objx_templ/lv_objx_templ.c",

    "lvgl/src/widgets/roller/lv_roller.c",

    "lvgl/src/widgets/slider/lv_slider.c",

    "lvgl/src/widgets/span/lv_span.c",

    "lvgl/src/widgets/spinbox/lv_spinbox.c",

    "lvgl/src/widgets/spinner/lv_spinner.c",    

    "lvgl/src/widgets/switch/lv_switch.c",           

    "lvgl/src/widgets/table/lv_table.c",  

    "lvgl/src/widgets/tabview/lv_tabview.c",

    "lvgl/src/widgets/textarea/lv_textarea.c",

    "lvgl/src/widgets/tileview/lv_tileview.c",



    "lvgl/lv_port_disp.c",



    #"lvgl/demos/music/lv_demo_music_list.c",

    #"lvgl/demos/music/lv_demo_music_main.c",

    #"lvgl/demos/music/lv_demo_music.c",

    "lvgl/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/spi",

    "//drivers/hdf_core/adapter/khdf/liteos_m/osal/include/",

    "//drivers/hdf_core/framework/include/core/",

    "//drivers/hdf_core/framework/include/osal/",

    "lvgl/",

    "lvgl/src",

    ".",

]

测试代码

vendor/openvalley/niobeu4/demo/107_hdf_spi/spi_example.c中

增加

#include "lvgl.h"

#include "lv_port_disp.h"

任务中

注意初始化

lv_init();在

lv_port_disp_init();前

再创建lc对象

再周期执行

lv_task_handler();

另专门开任务周期调用

lv_tick_inc(5);

lv_timer_handler();
提供滴答和定时器处理。

static void btn_event_cb(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t * btn = lv_event_get_target(e);
    if(code == LV_EVENT_CLICKED) {
        static uint8_t cnt = 0;
        cnt++;

        /*Get the first child of the button which is the label and change its text*/
        lv_obj_t * label = lv_obj_get_child(btn, 0);
        lv_label_set_text_fmt(label, "Button: %d", cnt);
    }
}

void lv_log_print(const char * buf)
{
    printf("%srn",buf);
}

/**
 * Create a button with a label and react on click event.
 */
void lv_example_get_started_1(void)
{
    lv_obj_t * btn = lv_btn_create(lv_scr_act());     /*Add a button the current screen*/
    lv_obj_set_pos(btn, 10, 10);                            /*Set its position*/
    lv_obj_set_size(btn, 60, 25);                          /*Set its size*/
    lv_obj_add_event_cb(btn, btn_event_cb, LV_EVENT_ALL, NULL);           /*Assign a callback to the button*/

    lv_obj_t * label = lv_label_create(btn);          /*Add a label to the button*/
    lv_label_set_text(label, "Button");                     /*Set the labels text*/
    lv_obj_center(label);
}

void lv_tick_handle(UINT32 arg)
{
    while(1)
    {
        LOS_Msleep(5);   /*Sleep for 5 millisecond*/
        lv_tick_inc(5);
        lv_timer_handler();
    }
}

void StartHdfSPITest(void)
{
    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;

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

    //lv_demo_stress();
    lv_example_get_started_1();
    while(1)
    {
        LOS_Msleep(1);  
        lv_task_handler();
    }
}

执行效果

创建了一个按钮,由于输入驱动还没移植所以不能演示按钮事件。

总结

1. 只移植了显示驱动,后面可以移植输入驱动,和文件系统接口,以实现完整的功能。
2. 移植比较简单,按照模板修改即可,之前已经测试好显示操作,所以移植很快。
3. 后面再基于此进行具体项目开发,比如基于ADC可以实现简易的示波器。