【学习笔记】XR872 GUI Littlevgl 8.0 移植（显示部分）

阅读原文时间：2023年07月09日阅读：2

官方网站：LVGL - Light and Versatile Embedded Graphics Library

源码位置：GitHub - lvgl/lvgl: Powerful and easy-to-use embedded GUI library with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash).

官方文档：Introduction — LVGL documentation

LVGL 是一款使用 C 语言编写的非常精巧的开源 UI，拥有非常漂亮的视觉效果，对硬件资源要求很低，且移植非常简单。

以下位摘录则官方文档中对硬件最低要求说明：

16, 32 or 64 bit microcontroller or processor
> 16 MHz clock speed is recommended
Flash/ROM: > 64 kB for the very essential components (> 180 kB is recommended)
RAM:
- Static RAM usage: ~2 kB depending on the used features and objects types
- Stack: > 2kB (> 8 kB is recommended)
- Dynamic data (heap): > 4 KB (> 32 kB is recommended if using several objects). Set by LV_MEM_SIZE in lv_conf.h.
- Display buffer: > "Horizontal resolution" pixels (> 10 × "Horizontal resolution" is recommended)
- One frame buffer in the MCU or in external display controller
C99 or newer compiler
Basic C (or C++) knowledge: pointers, structs, callbacks.

LVGL 已将跟硬件相关的代码实现抽象出来，涉及到以下三个硬件模块，我们只需要按需选择实现即可：

一. 显示模块，模板文件为：lv_port_disp_template.h、lv_port_disp_template.c

实现回调接口：

void (*flush_cb)(struct _lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p);

当需要绘制或更新图像时，LVGL会通过该接口传递一个指定矩形区域（area）和显示指定颜色值（color_p），我们需要实现在指定矩形区域内绘制指定颜色值。

LVGL 在刷动态效果是以固定的频率刷新（FPS），默认间隔时间为 30ms，通过配置文件中的宏决定 LV_DISP_DEF_REFR_PERIOD

2. 输入模块，模板文件为：lv_port_indev_template.h、lv_port_indev_template.c

输入设备支持四种类型：LV_INDEV_TYPE_POINTER(鼠标\触摸屏)、LV_INDEV_TYPE_KEYPAD(键盘)、LV_INDEV_TYPE_BUTTON(按钮)、LV_INDEV_TYPE_ENCODER(编码器)

实现回调接口：

void (*read_cb)(struct _lv_indev_drv_t * indev_drv, lv_indev_data_t * data);

LVGL 会间隔指定时间去调用此接口，来获取外部输入设备的输入事件，默认间隔时间为 30ms，通过配置文件中的宏决定 LV_INDEV_DEF_READ_PERIOD

3. 文件系统，模板文件为：lv_port_fs_template.h、lv_port_fs_template.c

实现回调接口：

bool (*ready_cb)(struct _lv_fs_drv_t * drv);

void * (*open_cb)(struct _lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode);
lv_fs_res_t (*close_cb)(struct _lv_fs_drv_t * drv, void * file_p);
lv_fs_res_t (*read_cb)(struct _lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br);
lv_fs_res_t (*write_cb)(struct _lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw);
lv_fs_res_t (*seek_cb)(struct _lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence);
lv_fs_res_t (*tell_cb)(struct _lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p);

void * (*dir_open_cb)(struct _lv_fs_drv_t * drv, const char * path);
lv_fs_res_t (*dir_read_cb)(struct _lv_fs_drv_t * drv, void * rddir_p, char * fn);
lv_fs_res_t (*dir_close_cb)(struct _lv_fs_drv_t * drv, void * rddir_p);

对应API接口：

lv_fs_res_t lv_fs_open(lv_fs_file_t * file_p, const char * path, lv_fs_mode_t mode);
lv_fs_res_t lv_fs_close(lv_fs_file_t * file_p);
lv_fs_res_t lv_fs_read(lv_fs_file_t * file_p, void * buf, uint32_t btr, uint32_t * br);
lv_fs_res_t lv_fs_write(lv_fs_file_t * file_p, const void * buf, uint32_t btw, uint32_t * bw);
lv_fs_res_t lv_fs_seek(lv_fs_file_t * file_p, uint32_t pos, lv_fs_whence_t whence);
lv_fs_res_t lv_fs_tell(lv_fs_file_t * file_p, uint32_t * pos);
lv_fs_res_t lv_fs_dir_open(lv_fs_dir_t * rddir_p, const char * path);
lv_fs_res_t lv_fs_dir_read(lv_fs_dir_t * rddir_p, char * fn);
lv_fs_res_t lv_fs_dir_close(lv_fs_dir_t * rddir_p);

一、建立新的工程

拷贝 xradio-skylark-sdk\project\demo\hello_demo 到 xradio-skylark-sdk\project\demo\lvgl_demo

二、LCD 驱动移植

需要提前准备好可以在 XR872 平台上使用的 LCD ，并且实现设定绘制区域接口和在区域内绘制指定颜色的接口。

我这里选择型号为 ZJY154S0800TG01，屏驱芯片 st7789，分辨率为 240x240，颜色格式为：RGB565，通信接口为 SPI（8BIT）

三、下载源代码：https://github.com/lvgl/lvgl/archive/refs/tags/v8.0.0.zip

将下载好的源代码解压到 xradio-skylark-sdk\project\demo\lvgl_demo\gui\ 并重命名为 lvgl

四、抽取配置文件

拷贝 xradio-skylark-sdk\project\demo\lvgl_demo\gui\lvgl\lv_conf_template.h 到 xradio-skylark-sdk\project\demo\lvgl_demo\gui\lv_conf.h

五、使能配置文件生效

xradio-skylark-sdk\project\demo\lvgl_demo\gui\lv_conf.h

--- xradio-skylark-sdk\project\demo\lvgl_demo\gui\lvgl\lv_conf_template.h    2021-06-01 15:48:03.000000000 +0800
+++ xradio-skylark-sdk\project\demo\lvgl_demo\gui\lv_conf.h    2021-06-13 18:13:54.000000000 +0800
@@ -4,13 +4,13 @@
  */

 /*
  * COPY THIS FILE AS `lv_conf.h` NEXT TO the `lvgl` FOLDER
  */

-#if 0 /*Set it to "1" to enable content*/
+#if 1 /*Set it to "1" to enable content*/

 #ifndef LV_CONF_H
 #define LV_CONF_H
 /*clang-format off*/

 #include <stdint.h>

六、LVGL 时钟心跳和 LVGL 主循环

新增两个文件，填写以下内容，LVGL 内部有自己的定时器和绘图循环，因此需要定期调用 lv_tick_inc()、lv_task_handler() 两个接口

在这里我通过建立两个系统任务来调用，将 lv_tick_inc() 任务的优先级调至最高，也可以通过硬件定时器来调用该接口。

xradio-skylark-sdk\project\demo\lvgl_demo\gui\lvgl_driver\lv_tick_handle.h

/**
******************************************************************************
* @文件        lv_tick_handle.h
* @版本        V1.0.0
* @日期
* @概要        LVGL 时钟基准和主循环定期调用
* @作者        lmx
******************************************************************************
* @注意
*
*
******************************************************************************
*/
#ifndef _LV_TICK_HANDLE_H
#define _LV_TICK_HANDLE_H

/*************************************************************
*    函数:         lv_tick_handle_init
*    功能:     内部创建两个任务分别定时调用 LVGL 的时钟基准和主循环接口
*    参数:
*    返回值:
**************************************************************/
void lv_tick_handle_init(void);

#endif

xradio-skylark-sdk\project\demo\lvgl_demo\gui\lvgl_driver\lv_tick_handle.c

/**
******************************************************************************
* @文件        lv_tick_handle.h
* @版本        V1.0.0
* @日期
* @概要        LVGL 时钟基准和主循环定期调用
* @作者        lmx
******************************************************************************
* @注意
*
*
******************************************************************************
*/
#include <stdio.h>
#include "lv_port_disp.h"
#include "kernel/os/os.h"

/*************************************************************
*    函数:         prvLvTickTask
*    功能:     LVGL 时钟基准任务
*    参数:
*    返回值:
**************************************************************/
static void prvLvTickTask(void *pvParameters)
{
    while(1){
        lv_tick_inc(1);
        OS_MSleep(1);
    }

    return ;
}

/*************************************************************
*    函数:         prvLvHandlerTask
*    功能:     LVGL 主循环任务
*    参数:
*    返回值:
**************************************************************/
static void prvLvHandlerTask(void *pvParameters)
{
    while(1){
        lv_task_handler();
        OS_MSleep(5);
    }

    return ;
}

/*************************************************************
*    函数:         lv_tick_handle_init
*    功能:     内部创建两个任务分别定时调用 LVGL 的时钟基准和主循环接口
*    参数:
*    返回值:
**************************************************************/
void lv_tick_handle_init(void)
{
    printf("[lv_disp] OS_ThreadCreate: prvLvTickTask\n");
    #define LVGL_TASK_TICK_PRIORITY         (OS_PRIORITY_REAL_TIME)
    #define LVGL_TASK_TICK_STACK_SIZE       (4 * 1024)
    static OS_Thread_t lv_task_tick_thread;
    OS_ThreadCreate(&lv_task_tick_thread, "lvgl_task_tick", prvLvTickTask, (void *)NULL, LVGL_TASK_TICK_PRIORITY, LVGL_TASK_TICK_STACK_SIZE);

    printf("[lv_disp] OS_ThreadCreate: prvLvHandlerTask\n");
    #define LVGL_TASK_HANDLER_PRIORITY      (OS_PRIORITY_NORMAL)
    #define LVGL_TASK_HANDLER_STACK_SIZE    (4 * 1024)
    static OS_Thread_t lv_task_handle_thread;
    OS_ThreadCreate(&lv_task_handle_thread, "lvgl_task_handler", prvLvHandlerTask, (void *)NULL, LVGL_TASK_HANDLER_PRIORITY, LVGL_TASK_HANDLER_STACK_SIZE);

    return ;
}

七、编译工程排错

问题一：找不到头文件 lvgl.h

../../../../project/demo/lvgl_demo/gui/lvgl/examples/assets/animimg001.c:4:23: fatal error: lvgl/lvgl.h: No such file or directory
 #include "lvgl/lvgl.h"
                       ^
compilation terminated.
make: *** [../../../../gcc.mk:218: ../../../../project/demo/lvgl_demo/gui/lvgl/examples/assets/animimg001.o] Error 1

解决方法：设置好 lvgl 所在的路径作为 GCC 搜索路径

--- xradio-skylark-sdk\project\demo\lvgl_demo\gcc\Makefile
+++ xradio-skylark-sdk\project\demo\lvgl_demo\gcc\Makefile
@@ -53,13 +53,13 @@
 # PRJ_EXTRA_LIBS_PATH :=

 # extra libraries
 # PRJ_EXTRA_LIBS :=

 # extra header files searching path
-# PRJ_EXTRA_INC_PATH :=
+PRJ_EXTRA_INC_PATH := -I$(PRJ_ROOT_PATH)/gui

 # extra symbols (macros)
 # PRJ_EXTRA_SYMBOLS :=

 # ----------------------------------------------------------------------------
 # override project variables

问题二：未使用的变量

../../../../project/demo/lvgl_demo/gui/lvgl/examples/widgets/btnmatrix/lv_example_btnmatrix_1.c: In function 'event_handler':
../../../../project/demo/lvgl_demo/gui/lvgl/examples/widgets/btnmatrix/lv_example_btnmatrix_1.c:10:22: error: unused variable 'txt' [-Werror=unused-variable]
         const char * txt = lv_btnmatrix_get_btn_text(obj, id);
                      ^
cc1.exe: all warnings being treated as errors
make: *** [../../../../gcc.mk:218: ../../../../project/demo/lvgl_demo/gui/lvgl/examples/widgets/btnmatrix/lv_example_btnmatrix_1.o] Error 1

解决方法：最快的解决方法就是设置编译器不将未使用的变量视为错误，也可以去修改源代码，把响应未使用的变量屏蔽掉，但不建议这么去做。

--- xradio-skylark-sdk\project\demo\lvgl_demo\gcc\Makefile
+++ xradio-skylark-sdk\project\demo\lvgl_demo\gcc\Makefile
@@ -46,12 +46,14 @@
 DIRS += $(PRJ_BOARD)

 SRCS := $(basename $(foreach dir,$(DIRS),$(wildcard $(dir)/*.[csS])))

 OBJS := $(addsuffix .o,$(SRCS))

+CC_FLAGS += -Wno-error
+
 # extra libraries searching path
 # PRJ_EXTRA_LIBS_PATH :=

 # extra libraries
 # PRJ_EXTRA_LIBS :=

问题三：提示空间不足

err: bin 1 and bin 2 were overlaped!
Overlapped size: 126176 Byte(124kB)
bin 1 name:app.bin    begin: 0x00008000    end: 0x000318E0
bin 2 name:app_xip.bin    begin: 0x00012C00

We've rearranged bin files and generated new cfg file 'image_auto_cal.cfg', the new one is recommended.
Generate image file failed
make: *** [../../../../project/project.mk:352: image] Error 127

解决方法：按照编译提示信息，将 image_auto_cal.cfg 文件重命名为 image.cfg 文件，同时修改 Makefile

--- xradio-skylark-sdk\project\demo\lvgl_demo\gcc\Makefile
+++ xradio-skylark-sdk\project\demo\lvgl_demo\gcc\Makefile
@@ -48,12 +48,14 @@
 SRCS := $(basename $(foreach dir,$(DIRS),$(wildcard $(dir)/*.[csS])))

 OBJS := $(addsuffix .o,$(SRCS))

 CC_FLAGS += -Wno-error

+IMAGE_CFG := ./image.cfg
+
 # extra header files searching path
 PRJ_EXTRA_INC_PATH := -I$(PRJ_ROOT_PATH)/gui

 # extra symbols (macros)
 # PRJ_EXTRA_SYMBOLS :=

主要参考 lvgl_demo\lvgl\examples\porting 中的 lv_port_disp_template.h、lv_port_disp_template.c 两个文件即可。

我这边基于多屏兼容性考虑，为了提高可读性和灵活性，不固定分辨率和位宽，做了精简和调整，完整实现文件如下：

xradio-skylark-sdk\project\demo\lvgl_demo\gui\lvgl_driver\lv_port_disp.h

/**
******************************************************************************
* @文件        lv_port_disp.h
* @版本        V1.0.0
* @日期
* @概要        LVGL 显示驱动
* @作者        lmx
******************************************************************************
* @注意
*
*
******************************************************************************
*/
#ifndef LV_PORT_DISP_H
#define LV_PORT_DISP_H

#include "lvgl/lvgl.h"
#include "library/inc/lcd_device.h"

/*************************************************************
*    函数:         lv_port_disp_init
*    功能:     初始化显示设备
*    参数:
*    返回值:        -1:失败   0:成功
**************************************************************/
int lv_port_disp_init(lcd_device_t *lcd);

#endif

xradio-skylark-sdk\project\demo\lvgl_demo\gui\lvgl_driver\lv_port_disp.c

/**
******************************************************************************
* @文件        lv_port_disp.c
* @版本        V1.0.0
* @日期
* @概要        LVGL 显示驱动
* @作者        lmx
******************************************************************************
* @注意
*
*
******************************************************************************
*/
#include <stdio.h>
#include "lv_port_disp.h"
#include "kernel/os/os.h"

typedef struct{
    lcd_device_t    *lcd;
    unsigned short  *frame;
}disp_device_t;

/*************************************************************
*    函数:         disp_flush
*    功能:     绘制颜色点回调
*    参数:
*    返回值:
**************************************************************/
static void disp_flush(lv_disp_drv_t *disp_drv, const lv_area_t *area, lv_color_t *color_p)
{
    disp_device_t *disp = (disp_device_t *)disp_drv->user_data;
    lv_color_t *buf = (lv_color_t *)disp->frame;
    uint32_t w = (area->x2 - area->x1 + 1);
    uint32_t h = (area->y2 - area->y1 + 1);
    uint32_t i, len = w * h;

    // 对颜色值进行排序
    for(i = 0; i < len; i++){
        buf[i] = (lv_color_t)color_p->full;
        color_p++;
    }

    // 设置显示区域, 并一次性更新数据, 可以提升刷图速度
    disp->lcd->set_window(area->x1, area->y1, area->x2, area->y2);
    disp->lcd->brush(buf, len * sizeof(lv_color_t));
    lv_disp_flush_ready(disp_drv);
}

/*************************************************************
*    函数:         lv_port_disp_init
*    功能:     初始化显示设备
*    参数:
*    返回值:        -1:失败   0:成功
**************************************************************/
int lv_port_disp_init(lcd_device_t *lcd)
{
    static disp_device_t    disp;
    lcd_info_t                lcd_info;
    unsigned int            buflen;

    disp.lcd = lcd;
    lcd->get_info(&lcd_info);
    printf("[lv_disp] lcd:[%s]:[%dx%d] %d\n", lcd_info.name, lcd_info.hor, lcd_info.ver, sizeof(lv_color_t));

    // LVGL 内部所需要的显存缓冲区
    static lv_disp_draw_buf_t draw_buf_dsc_1;
    buflen = lcd_info.hor * 10 * sizeof(lv_color_t);
    lv_color_t *buf_1 = lv_mem_alloc(buflen);
    if(NULL == buf_1){
        printf("[lv_disp] draw lv_mem_alloc failed...\n");
        return -1;
    }
    lv_disp_draw_buf_init(&draw_buf_dsc_1, buf_1, NULL, lcd_info.hor * 10);

    // 申请缓存空间, 用于存储排序后的颜色数据
    disp.frame = lv_mem_alloc(buflen);
    if(NULL == disp.frame){
        printf("[lv_disp] frame lv_mem_alloc failed...\n");
        lv_mem_free(buf_1);
        return -1;
    }

    // 将此显示驱动注册到 LVGL 中
    static lv_disp_drv_t disp_drv;
    lv_disp_drv_init(&disp_drv);
    disp_drv.hor_res = lcd_info.hor;
    disp_drv.ver_res = lcd_info.ver;
    disp_drv.flush_cb = disp_flush;
    disp_drv.draw_buf = &draw_buf_dsc_1;
    disp_drv.user_data = &disp;
    lv_disp_drv_register(&disp_drv);

    return ;
}

最后一步还需要根据实际显示屏的能力来调整

1. LV_COLOR_DEPTH：颜色位深，我现在使用的屏是 RGB565，因此需要设定为 16 位宽

2. LV_COLOR_16_SWAP：同时由于 XR872 只支持 SPI 8BIT 传输方式，涉及高低字节传输问题，需要使能 LV_COLOR_16_SWAP

3. LV_USE_PERF_MONITOR：打开此宏可以显示当前 CPU 使用率和帧率，便于优化和显示

4. LV_MEM_CUSTOM：设置为 1 打开此宏，使用动态内存分配，LVGL 实际运行需要多少就申请多少，0 则静态内存。

备注说明：

LVGL 内存分为静态内存和动态内存，静态内存是事先占用一大块内存，动态内存则是 LVGL 按需申请。

LV_USE_MEM_MONITOR：打开此宏可以显示当前所使用的内存大小和占用比例，以及产生多少碎片。（选择静态内存才会显示信息）

注意，这里的内存占用比例指的是 LV_MEM_CUSTOM 宏为 0 的情况下，LV_MEM_SIZE 所定义的大小除于 LVGL 内部实际占用内存大小之比。

LVGL 有自己的内存管理机制，LV_MEM_SIZE 为一个静态数组的大小，这样就可以给 LVGL 设限，只允许它只使用指定已经分配好多大的内存区域。

xradio-skylark-sdk\project\demo\lvgl_demo\gui\lv_conf.h

--- xradio-skylark-sdk\project\demo\lvgl_demo\gui\lv_conf.h        2021-06-13 20:42:52.000000000 +0800
+++ xradio-skylark-sdk\project\demo\lvgl_demo\gui\lv_conf.h        2021-06-13 20:29:53.000000000 +0800
@@ -18,16 +18,16 @@

 /*====================
    COLOR SETTINGS
  *====================*/

 /*Color depth: 1 (1 byte per pixel), 8 (RGB332), 16 (RGB565), 32 (ARGB8888)*/
-#define LV_COLOR_DEPTH     32
+#define LV_COLOR_DEPTH     16

 /*Swap the 2 bytes of RGB565 color. Useful if the display has a 8 bit interface (e.g. SPI)*/
-#define LV_COLOR_16_SWAP   0
+#define LV_COLOR_16_SWAP   1

 /*Enable more complex drawing routines to manage screens transparency.
  *Can be used if the UI is above an other layer, e.g. an OSD menu or video player.
  *Requires `LV_COLOR_DEPTH = 32` colors and the screen's `bg_opa` should be set to non LV_OPA_COVER value*/
 #define LV_COLOR_SCREEN_TRANSP    0

@@ -36,13 +36,13 @@

 /*=========================
    MEMORY SETTINGS
  *=========================*/

 /*1: use custom malloc/free, 0: use the built-in `lv_mem_alloc()` and `lv_mem_free()`*/
-#define LV_MEM_CUSTOM      0
+#define LV_MEM_CUSTOM      1
 #if LV_MEM_CUSTOM == 0
 /*Size of the memory available for `lv_mem_alloc()` in bytes (>= 2kB)*/
 #  define LV_MEM_SIZE    (32U * 1024U)          /*[bytes]*/

 /*Set an address for the memory pool instead of allocating it as a normal array. Can be in external SRAM too.*/
 #  define LV_MEM_ADR          0     /*0: unused*/
@@ -183,13 +183,13 @@

 /*-------------
  * Others
  *-----------*/

 /*1: Show CPU usage and FPS count in the right bottom corner*/
-#define LV_USE_PERF_MONITOR     0
+#define LV_USE_PERF_MONITOR     1

 /*1: Show the used memory and the memory fragmentation  in the left bottom corner
  * Requires LV_MEM_CUSTOM = 0*/
 #define LV_USE_MEM_MONITOR      0

 /*1: Draw random colored rectangles over the redrawn areas*/

完整示例代码

xradio-skylark-sdk\project\demo\lvgl_demo\prj_config.h

---
+++
@@ -137,11 +137,26 @@
 /* net pm mode enable/disable */
 #define PRJCONF_NET_PM_EN               1

 /* environment variable "TZ" for time zone setting */
 #define PRJCONF_ENV_TZ                  "TZ=GMT-8"

+/*
+ * project gpio config
+ */
+
+/* lcd device config */
+#define PRJCONF_DEVICE_LCD_SPI_PORT                SPI1
+#define PRJCONF_DEVICE_LCD_BL_GPIO_PORT            GPIO_PORT_A
+#define PRJCONF_DEVICE_LCD_BL_GPIO_PIN                GPIO_PIN_22
+
+#define PRJCONF_DEVICE_LCD_RST_GPIO_PORT            GPIO_PORT_A
+#define PRJCONF_DEVICE_LCD_RST_GPIO_PIN            GPIO_PIN_19
+
+#define PRJCONF_DEVICE_LCD_MODE_GPIO_PORT            GPIO_PORT_A
+#define PRJCONF_DEVICE_LCD_MODE_GPIO_PIN            GPIO_PIN_20
+
 #ifdef __cplusplus
 }
 #endif

 #endif /* _PRJ_CONFIG_H_ */

xradio-skylark-sdk\project\demo\lvgl_demo\main.c

/**
******************************************************************************
* @文件        main.c
* @版本        V1.0.0
* @日期
* @概要
* @作者        lmx
******************************************************************************
* @注意
*
*
******************************************************************************
*/
#include "common/framework/platform_init.h"
#include <string.h>
#include <stdio.h>
#include "prj_config.h"
#include "kernel/os/os.h"
#include "lvgl/lvgl.h"
#include "lvgl-drivers/lv_port_disp.h"
#include "library/inc/lcd_st7789.h"

int main(void)
{
    static lcd_device_t lcd;
    lcd_para_t lcd_para;

    platform_init();

    memset(&lcd_para, 0, sizeof(lcd_para_t));
    lcd_para.dir        = 0;
    lcd_para.spi.ssel   = SPI_TCTRL_SS_SEL_SS0;
    lcd_para.spi.port   = PRJCONF_DEVICE_LCD_SPI_PORT;
    lcd_para.blk.port   = PRJCONF_DEVICE_LCD_BL_GPIO_PORT;
    lcd_para.blk.pin    = PRJCONF_DEVICE_LCD_BL_GPIO_PIN;
    lcd_para.rst.port   = PRJCONF_DEVICE_LCD_RST_GPIO_PORT;
    lcd_para.rst.pin    = PRJCONF_DEVICE_LCD_RST_GPIO_PIN;
    lcd_para.cmd.port   = PRJCONF_DEVICE_LCD_MODE_GPIO_PORT;
    lcd_para.cmd.pin    = PRJCONF_DEVICE_LCD_MODE_GPIO_PIN;
    register_operations_st7789(&lcd);

    lcd.init(&lcd_para);
    lcd.set_brightness(255);

    lv_init();
    lv_port_disp_init(&lcd);
    lv_tick_handle_init();

    lv_example_bar_6();
    lv_example_btn_1();

    while(1)
    {
        OS_Sleep(3);
    }

    return 0;
}

附带 LCD 驱动文件

/**
******************************************************************************
* @文件        lcd_device.h
* @版本        V1.0.0
* @日期
* @概要        lcd device interface definition
* @作者        lmx
******************************************************************************
* @注意
*
*
*
******************************************************************************
*/
#ifndef __LCD_DEVICE_H__
#define __LCD_DEVICE_H__

typedef struct{
    unsigned int ssel;          // SPI 片选号
    unsigned int port;          // SPI 端口号
}lcd_spi_t;

typedef struct{
    unsigned int port;          // GPIO 端口号
    unsigned int pin;           // GPIO 引脚号
}lcd_gpio_t;

typedef struct{
    unsigned char   dir;        // 显示方向：横屏\竖屏
    lcd_spi_t       spi;        // SPI 配置
    lcd_gpio_t      rst;        // 复位引脚配置
    lcd_gpio_t      blk;        // 背光引脚控制
    lcd_gpio_t      cmd;        // 命令数据切换
}lcd_para_t;

typedef struct{
    const char *name;           // 显示屏名称
    unsigned int hor;           // 水平长度
    unsigned int ver;           // 垂直长度
}lcd_info_t;

typedef struct{
    int (*init)(lcd_para_t *para);                              // 初始化
    int (*release)();                                           // 释放设备
    int (*get_info)(lcd_info_t *info);                          // 获取信息
    int (*set_brightness)(unsigned char val);                   // 背光设置
    int (*set_rotation)(unsigned char angle);                   // 设置方向
    int (*set_window)(unsigned short x1, unsigned short x2, unsigned short y1, unsigned short y2);// 设置窗口
    int (*brush)(void *pdata, unsigned int size);               // 绘制矩形
}lcd_device_t;

#endif


/**
******************************************************************************
* @文件        lcd_st7789.h
* @版本        V1.0.0
* @日期
* @概要        st7789 driver
* @作者        lmx
******************************************************************************
* @注意
*
*
*
******************************************************************************
*/
#ifndef __LCD_ST7789_H__
#define __LCD_ST7789_H__

#include "lcd_device.h"
#include "driver/chip/hal_spi.h"

int register_operations_st7789(lcd_device_t *device);

#endif


/**
******************************************************************************
* @文件        lcd_st7789.h
* @版本        V1.0.0
* @日期
* @概要        st7789 driver
* @作者        lmx
******************************************************************************
* @注意
*
*
*
******************************************************************************
*/
#include <stdio.h>
#include <string.h>
#include "lcd_st7789.h"
#include "kernel/os/os.h"
#include "driver/chip/hal_clock.h"

#define iprintf(fmt, arg...)    printf("[st7789] [inf] "fmt, ##arg)
#define eprintf(fmt, arg...)    printf("[st7789] [err] "fmt, ##arg)

// 大小端转换
#define LITTLE_ENDIAN_32(_VAL_) (((_VAL_ & 0x000000ff) << 24 ) | ((_VAL_ & 0x0000ff00) << 8) | ((_VAL_ & 0x00ff0000) >> 8) | ((_VAL_ & 0xff000000 ) >> 24))
#define LITTLE_ENDIAN_16(_VAL_) (((_VAL_ & 0x00ff) << 8 ) | ((_VAL_ & 0xff00) >> 8))

// 复位控制
#define RESET_ENABLE()            HAL_GPIO_WritePin(lcd_para.rst.port, lcd_para.rst.pin, GPIO_PIN_LOW)
#define RESET_DISABLE()            HAL_GPIO_WritePin(lcd_para.rst.port, lcd_para.rst.pin, GPIO_PIN_HIGH)

// 背光控制
#define BRIGHTNESS_ENABLE()        HAL_GPIO_WritePin(lcd_para.blk.port, lcd_para.blk.pin, GPIO_PIN_HIGH)
#define BRIGHTNESS_DISABLE()    HAL_GPIO_WritePin(lcd_para.blk.port, lcd_para.blk.pin, GPIO_PIN_LOW)

// 命令模式
#define ENTER_COMMAND_MODE()    HAL_GPIO_WritePin(lcd_para.cmd.port, lcd_para.cmd.pin, GPIO_PIN_LOW)
#define ENTER_DATA_MODE()        HAL_GPIO_WritePin(lcd_para.cmd.port, lcd_para.cmd.pin, GPIO_PIN_HIGH)

// 参数配置
static lcd_para_t lcd_para;

static void dump_hex(char *table, void *data, unsigned int length)
{
    printf("dump:begin->table:[%s][%d]---------------\n", table, length);
    length = length > 16 ? 16 : length;
    for(unsigned int i = 0; i < length; i++){
        printf("0x%.2X ", ((unsigned char*)data)[i]);
    }
    printf("\ndump:end  ->table:[%s][%d]---------------\n", table, length);
}

// 传输命令
static int spi_transmit_command(void *command, unsigned int length)
{
    ENTER_COMMAND_MODE();
//    dump_hex("command", command, length);
    HAL_SPI_CS(lcd_para.spi.port, 1);
    if (HAL_SPI_Transmit(lcd_para.spi.port, command, length) != HAL_OK) {
        HAL_SPI_CS(lcd_para.spi.port, 0);
        return -1;
    }
    HAL_SPI_CS(lcd_para.spi.port, 0);

    return 0;
}

// 传输数据
static int spi_transmit_data(void *data, unsigned int length)
{
    ENTER_DATA_MODE();
//    dump_hex("data", data, length);
    HAL_SPI_CS(lcd_para.spi.port, 1);
    if (HAL_SPI_Transmit(lcd_para.spi.port, data, length) != HAL_OK) {
        HAL_SPI_CS(lcd_para.spi.port, 0);
        return -1;
    }
    HAL_SPI_CS(lcd_para.spi.port, 0);

    return 0;
}

// 传输单个命令
static int spi_transmit_reg(unsigned char reg)
{
    return spi_transmit_command(&reg, sizeof(unsigned char));
}

// 传输单个数据
static int spi_transmit_val(unsigned char val)
{
    return spi_transmit_data(&val, sizeof(unsigned char));
}

// 背光控制
static int lcd_set_brightness(unsigned char val)
{
    val ? BRIGHTNESS_ENABLE() : BRIGHTNESS_DISABLE();
    return 0;
}

// 显示方向
static int lcd_set_rotation(unsigned char angle)
{
    lcd_para.dir = angle;
    spi_transmit_reg(0x36);
    switch(lcd_para.dir){
        case 0:     spi_transmit_val(0x00); break;
        case 1:     spi_transmit_val(0xC0); break;
        case 2:     spi_transmit_val(0x70); break;
        case 3:     spi_transmit_val(0xA0); break;
        default:    spi_transmit_val(0x00); break;
    }
    return 0;
}

// 设置绘制的窗口
static int lcd_set_window(unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2)
{
    unsigned int x = 0;
    unsigned int y = 0;

    switch(lcd_para.dir)
    {
        case 0: // 竖屏
            x = x1 << 16 | x2;
            y = y1 << 16 | y2;
            break;

        case 1: // 竖屏
            x = x1 << 16 | x2;
            y = (y1 + 80) << 16 | (y2 + 80);
            break;

        case 2: // 横屏
            x = x1 << 16 | x2;
            y = y1 << 16 | y2;
            break;

        case 3: // 横屏
            x = (x1 + 80) << 16 | (x2 + 80);
            y = y1 << 16 | y2;
            break;

        default:
            x = x1 << 16 | x2;
            y = y1 << 16 | y2;
            break;
    }

    x = LITTLE_ENDIAN_32(x);
    y = LITTLE_ENDIAN_32(y);

    spi_transmit_reg(0x2a);//列地址设置
    spi_transmit_data(&x, sizeof(unsigned int));
    spi_transmit_reg(0x2b);//行地址设置
    spi_transmit_data(&y, sizeof(unsigned int));
    spi_transmit_reg(0x2c);//储存器写

    return 0;
}

// 获取显示屏信息
static int lcd_get_info(lcd_info_t *info)
{
    info->name = "ST7789";
    info->hor = 240;
    info->ver = 240;

    return 0;
}

// 刷入显存(需要调整高低字节)
static int lcd_brush(void *pdata, unsigned int size)
{
    return spi_transmit_data(pdata, size);
}

// 引脚初始化
static int gpio_init()
{
    GPIO_InitParam param;
    param.driving = GPIO_DRIVING_LEVEL_1;
    param.mode = GPIOx_Pn_F1_OUTPUT;
    param.pull = GPIO_PULL_NONE;

    HAL_GPIO_Init(lcd_para.blk.port, lcd_para.blk.pin, &param);
    HAL_GPIO_WritePin(lcd_para.blk.port, lcd_para.blk.pin, GPIO_PIN_LOW);

    HAL_GPIO_Init(lcd_para.rst.port, lcd_para.rst.pin, &param);
    HAL_GPIO_WritePin(lcd_para.rst.port, lcd_para.rst.pin, GPIO_PIN_LOW);

    HAL_GPIO_Init(lcd_para.cmd.port, lcd_para.cmd.pin, &param);
    HAL_GPIO_WritePin(lcd_para.cmd.port, lcd_para.cmd.pin, GPIO_PIN_LOW);

    return 0;
}

// 引脚释放
static int gpio_deinit()
{
    HAL_GPIO_WritePin(lcd_para.blk.port, lcd_para.blk.pin, GPIO_PIN_LOW);
    HAL_GPIO_WritePin(lcd_para.cmd.port, lcd_para.cmd.pin, GPIO_PIN_LOW);
    HAL_GPIO_WritePin(lcd_para.rst.port, lcd_para.rst.pin, GPIO_PIN_LOW);

    HAL_GPIO_DeInit(lcd_para.blk.port, lcd_para.blk.pin);
    HAL_GPIO_DeInit(lcd_para.rst.port, lcd_para.rst.pin);
    HAL_GPIO_DeInit(lcd_para.cmd.port, lcd_para.cmd.pin);
    return 0;
}

// 通信初始化
static int spi_init()
{
    SPI_Global_Config spi_param;
    spi_param.cs_level = 0;
    spi_param.mclk = HAL_GetCPUClock();
    if(HAL_SPI_Init(lcd_para.spi.port, &spi_param) != HAL_OK){
        return -1;
    }

    SPI_Config spi_Config;
    spi_Config.firstBit = SPI_TCTRL_FBS_MSB;
    spi_Config.mode = SPI_CTRL_MODE_MASTER;
    spi_Config.opMode = SPI_OPERATION_MODE_DMA;
    spi_Config.sclk = HAL_GetCPUClock() / 4;
    spi_Config.sclkMode = SPI_SCLK_Mode0;
    if (HAL_SPI_Open(lcd_para.spi.port, lcd_para.spi.ssel, &spi_Config, 1000) != HAL_OK) {
        return -1;
    }

    HAL_SPI_Config(lcd_para.spi.port, SPI_ATTRIBUTION_IO_MODE, SPI_IO_MODE_NORMAL);
    HAL_SPI_CS(lcd_para.spi.port, 0);

    return 0;
}

// 通信释放
static int spi_deinit()
{
    HAL_SPI_CS(lcd_para.spi.port, 0);
    HAL_SPI_Close(lcd_para.spi.port);
    HAL_SPI_Deinit(lcd_para.spi.port);

    return 0;
}

// 屏驱初始化
static int st7789_init()
{
    BRIGHTNESS_ENABLE();
    OS_MSleep(100);

    RESET_ENABLE();
    OS_MSleep(100);
    RESET_DISABLE();
    OS_MSleep(100);

    spi_transmit_reg(0x11);     //Sleep out
    OS_MSleep(120);             //Delay 120ms 

    spi_transmit_reg(0x36);
    switch(lcd_para.dir){
        case 0:     spi_transmit_val(0x00); break;
        case 1:     spi_transmit_val(0xC0); break;
        case 2:     spi_transmit_val(0x70); break;
        case 3:     spi_transmit_val(0xA0); break;
        default:    spi_transmit_val(0x00); break;
    }

    spi_transmit_reg(0x3A);
    spi_transmit_val(0x05);

    spi_transmit_reg(0xB2);
    spi_transmit_val(0x0C);
    spi_transmit_val(0x0C);
    spi_transmit_val(0x00);
    spi_transmit_val(0x33);
    spi_transmit_val(0x33);             

    spi_transmit_reg(0xB7);
    spi_transmit_val(0x35);

    spi_transmit_reg(0xBB);
    spi_transmit_val(0x32); //Vcom=1.35V

    spi_transmit_reg(0xC2);
    spi_transmit_val(0x01);

    spi_transmit_reg(0xC3);
    spi_transmit_val(0x15); //GVDD=4.8V  颜色深度

    spi_transmit_reg(0xC4);
    spi_transmit_val(0x20); //VDV, 0x20:0v

    spi_transmit_reg(0xC6);
    spi_transmit_val(0x0F); //0x0F:60Hz         

    spi_transmit_reg(0xD0);
    spi_transmit_val(0xA4);
    spi_transmit_val(0xA1); 

    spi_transmit_reg(0xE0);
    spi_transmit_val(0xD0);
    spi_transmit_val(0x08);
    spi_transmit_val(0x0E);
    spi_transmit_val(0x09);
    spi_transmit_val(0x09);
    spi_transmit_val(0x05);
    spi_transmit_val(0x31);
    spi_transmit_val(0x33);
    spi_transmit_val(0x48);
    spi_transmit_val(0x17);
    spi_transmit_val(0x14);
    spi_transmit_val(0x15);
    spi_transmit_val(0x31);
    spi_transmit_val(0x34);   

    spi_transmit_reg(0xE1);
    spi_transmit_val(0xD0);
    spi_transmit_val(0x08);
    spi_transmit_val(0x0E);
    spi_transmit_val(0x09);
    spi_transmit_val(0x09);
    spi_transmit_val(0x15);
    spi_transmit_val(0x31);
    spi_transmit_val(0x33);
    spi_transmit_val(0x48);
    spi_transmit_val(0x17);
    spi_transmit_val(0x14);
    spi_transmit_val(0x15);
    spi_transmit_val(0x31);
    spi_transmit_val(0x34);
    spi_transmit_reg(0x21); 

    spi_transmit_reg(0x29);

    return 0;
}

// 初始化设备
static int lcd_init(lcd_para_t *para)
{
    memcpy(&lcd_para, para, sizeof(lcd_para_t));

    if(spi_init()){
        eprintf("spi interface failed...");
        return -1;
    }

    if(gpio_init()){
        eprintf("gpio interface failed...");
        return -1;
    }

    st7789_init();
    return 0;
}

// 释放设备
static int lcd_release()
{
    spi_deinit();
    gpio_deinit();
    return 0;
}

// 注册回调
int register_operations_st7789(lcd_device_t *device)
{
    memset(device, 0, sizeof(lcd_device_t));
    device->init            = lcd_init;
    device->get_info        = lcd_get_info;
    device->set_brightness  = lcd_set_brightness;
    device->set_rotation    = lcd_set_rotation;
    device->set_window      = lcd_set_window;
    device->brush           = lcd_brush;
    device->release         = lcd_release;
    return 0;
}

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