一、概述

开发板：STM32F103C8T6
显示器：ST7735S
RT-Thread：5.0.0

玩过 GUI 的小伙伴都知道，界面的显示是一个个像素点组合起来的，那么直接构建出来炫酷的 GUI 还是相对比较困难的，所以我们一般都会使用一些 GUI 库来实现，比如 LVGL、QT、UGUI等，这样对于驱动开发的人员来说就相对比较简单了，

图形库应用的核心思想只需要提供一帧的缓冲区，我们只需要不断的将缓冲区的数据写入到 LCD 中即可，而缓冲区的内容由图形库实现，需要注意的是这个缓冲的创建方式，有的图形库会自己创建缓冲区，我们只需要负责刷新 LCD 的显示即可，而有的图形库是由驱动提供缓冲区，图形库负责写入。

二、RT-Thread 移植

移植 RT-Thread 不是此文章的重点，可以参考一下我之前的笔记，或者直接使用 RT-Thread Studio、STM32CubeMX等工具直接生成，这里我就不过多介绍了

三、LCD 驱动

使用过 RT-Thread 的小伙伴，都知道 RT-Thread 目前还不能直接使用工具生成我们想要的 LCD 驱动，所以这里我们只能根据标准的驱动进行编写了

驱动函数结构体

/* 驱动函数实现的结构体 */

#ifdef RT_USING_DEVICE_OPS

const static struct rt_device_ops lcd_ops =

{

    drv_lcd_init,

    RT_NULL,

    RT_NULL,

    RT_NULL,

    RT_NULL,

    drv_lcd_control

};

#endif

注册 LCD 设备

int drv_lcd_hw_init(void)

{

    rt_err_t result = RT_EOK;

    rt_uint32_t lcd_buff_size = lcd_buff_size = LCD_HEIGHT * LCD_WIDTH * 2;

    /* 创建LCD设备对象 */

    struct rt_device *device = &_lcd.lcd_dev;

    memset(&_lcd, 0x00, sizeof(_lcd));

    LOG_D("drv_lcd_hw_init!\n");

    /* 初始化lcd_lock信号量 */

    result = rt_sem_init(&_lcd.lcd_lock, "lcd_lock", 0, RT_IPC_FLAG_FIFO);

    if (result != RT_EOK)

    {

        LOG_E("init semaphore failed!\n");

        result = -RT_ENOMEM;

        goto __exit;

    }

    /* 设置 LCD 设备信息 */

    _lcd.lcd_info.height = LCD_HEIGHT;

    _lcd.lcd_info.width = LCD_WIDTH;

    _lcd.lcd_info.bits_per_pixel = LCD_BITS_PER_PIXEL;

    _lcd.lcd_info.pixel_format = RTGRAPHIC_PIXEL_FORMAT_RGB565;     // 图像的格式（RGB：565）

    /* LCD 显示缓冲区，大小为显示一帧图像所需空间 */

    _lcd.lcd_info.smem_len = lcd_buff_size;

    _lcd.lcd_info.framebuffer = rt_malloc(lcd_buff_size);

    if (_lcd.lcd_info.framebuffer == RT_NULL)

    {

        LOG_E("init frame buffer failed!\n");

        result = -RT_ENOMEM;

        goto __exit;

    }

    /* 将缓冲区初始化为 0xFF */

    memset(_lcd.lcd_info.framebuffer, 0xFF, lcd_buff_size);

#ifdef RT_USING_DEVICE_OPS

    device->ops     = &lcd_ops;

#else

    device->init    = drv_lcd_init;

    device->control = drv_lcd_control;

#endif

    /* 注册 LCD 设备 */

    rt_device_register(device, "lcd", RT_DEVICE_FLAG_RDWR);

__exit:

    if (result != RT_EOK)

    {

        rt_sem_detach(&_lcd.lcd_lock);

        if (_lcd.lcd_info.framebuffer)

        {

            rt_free(_lcd.lcd_info.framebuffer);

        }

    }

    return result;

}

LCD 控制函数的实现

static rt_err_t drv_lcd_control(struct rt_device *device, int cmd, void *args)

{

    // struct drv_lcd_device *lcd = LCD_DEVICE(device);

    LOG_D("drv_lcd_control cmd is: %d\n", cmd);

    switch (cmd)

    {

        case RTGRAPHIC_CTRL_RECT_UPDATE:

        {

            rt_sem_take(&_lcd.lcd_lock, RT_TICK_PER_SECOND / 20);

            /* 刷新缓冲区 */

            rt_sem_release(&_lcd.lcd_lock);

        }

        break;

        case RTGRAPHIC_CTRL_POWERON:

        {

            /* LCD 退出睡眠模式 */

        }

        break;

        case RTGRAPHIC_CTRL_POWEROFF:

        {

            /* LCD 进入睡眠模式 */

        }

        break;

        case RTGRAPHIC_CTRL_GET_INFO:

        {

            /* 获取 LCD 参数 */

            memcpy(args, &_lcd.lcd_info, sizeof(_lcd.lcd_info));

        }

        break;

        default:

            return -RT_EINVAL;

    }

    return RT_EOK;

}

LCD 驱动功能实现

剩下的就比较简单了，只需要参考 LCD 提供的案例程序进行更改就好了，主要有实现如下

drv_lcd_init： 完成 LCD 的复位、初始化、首次清屏工作
drv_lcd_control： 完成 LCD 显示区域的刷新、屏幕参数的返回、亮屏和息屏等工作

注意：具体实现参考后面的程序源码，相对比较简单，这里就不过多介绍了

四、UGUI 介绍

介绍

µGUI 是一个用于嵌入式系统的免费开源图形库。 它独立于平台，可以轻松移植到几乎任何微控制器系统。 只要显示器能够显示图形，μGUI 就不受某种显示技术的限制。 因此，支持LCD、TFT、E-Paper、LED或OLED等显示技术。 整个模块由两个文件组成：ugui.c 和 ugui.h。

注意：这里的介绍我直接引用了作者的描述

获取 UGUI

github：https://github.com/xidongxu/ugui

文件目录

使用介绍

移植： 我们主要实现 ugui_port.c，这里下载时已经提供了案例，所以我只需要在其中进行简单的修改
使用： 使用相对比较简单，直接参考 “µGUI v0.3.pdf” 文档即可，直接没有难度

五、UGUI 移植

初始化

直接在 ugui_port.c 文件中使用 INIT_COMPONENT_EXPORT(ugui_port_init) 进行自动初始化，如下图所示：

lcd_open 函数

这里不要做任何更改，从函数中可以看出 LCD 相关的参数获取，如下图所示：

lcd_draw_pixel 函数

主要功能是在缓冲区中写入一个像素点的颜色，如下图所示：

ugui_port_thread_entry 函数

这是线程的入口函数，主要目的是定期将缓冲区的数据写入到 LCD 中，下图所示：

注意：从以上步奏可以看出，移植 UGUI 时不需要更改任何参数，只需要在初始化时调用 ugui_port_init 函数即可。

六、程序源码

drv_lcd_st7735s.h

/**

 * @file drv_lcd_st7735s.h

 *

 */

#ifndef __DRV_LCD_ST7735S_H__

#define __DRV_LCD_ST7735S_H__

#include <rtthread.h>

#define LCD_HEIGHT                      20      // LCD 高像素

#define LCD_WIDTH                       128      // LCD 宽像素

#define LCD_BITS_PER_PIXEL              16      // 像素点的数据宽度

#define LCD_CS_PIN_TYPE                 GPIOA               // CS 引脚所在的组

#define LCD_CS_PIN                      GPIO_PIN_4          // 引脚编号

#define LCD_BCK_PIN                     GET_PIN(B, 1)       // 背光引脚

#define LCD_DC_PIN                      GET_PIN(B, 8)       // 数据引脚

#define LCD_RES_PIN                     GET_PIN(B, 9)       // 复位引脚

#define WHITE            0xFFFF

#define BLACK            0x0000

#define BLUE             0x001F

#define BRED             0XF81F

#define GRED             0XFFE0

#define GBLUE            0X07FF

#define RED              0xF800

#define MAGENTA          0xF81F

#define GREEN            0x07E0

#define CYAN             0x7FFF

#define YELLOW           0xFFE0

#define BROWN            0XBC40

#define BRRED            0XFC07

#define GRAY             0X8430

#define GRAY175          0XAD75

#define GRAY151          0X94B2

#define GRAY187          0XBDD7

#define GRAY240          0XF79E

#endif  /* __DRV_LCD_ST7735S_H__ */

drv_lcd_st7735s.c

/***************************************************************

文件名 : drv_lcd_st7735s.c

作者 : jiaozhu

版本 : V1.0

描述 : st7735s 显示驱动

其他 : 无

日志 : 初版 V1.0 2023/04/28

***************************************************************/

#include <board.h>

#include <rtthread.h>

#ifdef BSP_USING_LCD

#include "drv_spi.h"

#include <string.h>

#include "drv_lcd_st7735s.h"

//#define DRV_DEBUG

#define LOG_TAG             "drv.lcd"

#include <drv_log.h>

static struct rt_spi_device *spi_dev_lcd;

struct drv_lcd_device

{

    struct rt_device lcd_dev;

    struct rt_device_graphic_info lcd_info;

    struct rt_semaphore lcd_lock;

};

struct drv_lcd_device _lcd;

/**

 * @brief  LCD 命令写入，写入时数据引脚为低电平

 *

 * @param  cmd 命令

 * @retval 返回执行结果

 */

static rt_err_t lcd_write_cmd(const rt_uint8_t cmd)

{

    rt_size_t len;

    rt_pin_write(LCD_DC_PIN, PIN_LOW);

    len = rt_spi_send(spi_dev_lcd, &cmd, 1);

    if (len != 1)

    {

        LOG_I("lcd_write_cmd error. %d", len);

        return -RT_ERROR;

    }

    else

    {

        return RT_EOK;

    }

}

/**

 * @brief  LCD 数据写入，写入时数据引脚为高电平

 *

 * @param  cmd 命令

 * @retval 返回执行结果

 */

static rt_err_t lcd_write_data(const rt_uint8_t data)

{

    rt_size_t len;

    rt_pin_write(LCD_DC_PIN, PIN_HIGH);

    len = rt_spi_send(spi_dev_lcd, &data, 1);

    if (len != 1)

    {

        LOG_I("lcd_write_data error. %d", len);

        return -RT_ERROR;

    }

    else

    {

        return RT_EOK;

    }

}

/**

 * @brief  LCD 板级初始化

 *

 * @param  None

 * @retval int 初始化结果

 */

static int lcd_dev_init(void)

{

    lcd_write_cmd(0x11); //Sleep out

	rt_thread_delay(12); //Delay 12ms

	//------------------------------------ST7735S Frame Rate-----------------------------------------//

	lcd_write_cmd(0xB1);

	lcd_write_data(0x05);

	lcd_write_data(0x3C);

	lcd_write_data(0x3C);

	lcd_write_cmd(0xB2);

	lcd_write_data(0x05);

	lcd_write_data(0x3C);

	lcd_write_data(0x3C);

	lcd_write_cmd(0xB3);

	lcd_write_data(0x05);

	lcd_write_data(0x3C);

	lcd_write_data(0x3C);

	lcd_write_data(0x05);

	lcd_write_data(0x3C);

	lcd_write_data(0x3C);

	//------------------------------------End ST7735S Frame Rate-----------------------------------------//

	lcd_write_cmd(0xB4); //Dot inversion

	lcd_write_data(0x03);

	lcd_write_cmd(0xC0);

	lcd_write_data(0x28);

	lcd_write_data(0x08);

	lcd_write_data(0x04);

	lcd_write_cmd(0xC1);

	lcd_write_data(0XC0);

	lcd_write_cmd(0xC2);

	lcd_write_data(0x0D);

	lcd_write_data(0x00);

	lcd_write_cmd(0xC3);

	lcd_write_data(0x8D);

	lcd_write_data(0x2A);

	lcd_write_cmd(0xC4);

	lcd_write_data(0x8D);

	lcd_write_data(0xEE);

	//---------------------------------End ST7735S Power Sequence-------------------------------------//

	lcd_write_cmd(0xC5); //VCOM

	lcd_write_data(0x1A);

	lcd_write_cmd(0x36); //MX, MY, RGB mode

	lcd_write_data(0xC0);

	//------------------------------------ST7735S Gamma Sequence-----------------------------------------//

	lcd_write_cmd(0xE0);

	lcd_write_data(0x04);

	lcd_write_data(0x22);

	lcd_write_data(0x07);

	lcd_write_data(0x0A);

	lcd_write_data(0x2E);

	lcd_write_data(0x30);

	lcd_write_data(0x25);

	lcd_write_data(0x2A);

	lcd_write_data(0x28);

	lcd_write_data(0x26);

	lcd_write_data(0x2E);

	lcd_write_data(0x3A);

	lcd_write_data(0x00);

	lcd_write_data(0x01);

	lcd_write_data(0x03);

	lcd_write_data(0x13);

	lcd_write_cmd(0xE1);

	lcd_write_data(0x04);

	lcd_write_data(0x16);

	lcd_write_data(0x06);

	lcd_write_data(0x0D);

	lcd_write_data(0x2D);

	lcd_write_data(0x26);

	lcd_write_data(0x23);

	lcd_write_data(0x27);

	lcd_write_data(0x27);

	lcd_write_data(0x25);

	lcd_write_data(0x2D);

	lcd_write_data(0x3B);

	lcd_write_data(0x00);

	lcd_write_data(0x01);

	lcd_write_data(0x04);

	lcd_write_data(0x13);

	//------------------------------------End ST7735S Gamma Sequence-----------------------------------------//

	lcd_write_cmd(0x3A); //65k mode

	lcd_write_data(0x05);

	lcd_write_cmd(0x29); //Display on

    return RT_EOK;

}

/**

 * @brief  初始化 LCD 所需的引脚，并通过引脚复位 LCD

 *

 * @param  None

 * @retval None

 */

static void lcd_gpio_init(void)

{

    /* 配置引脚模式 */

    rt_pin_mode(LCD_DC_PIN, PIN_MODE_OUTPUT);

    rt_pin_mode(LCD_RES_PIN, PIN_MODE_OUTPUT);

    rt_pin_mode(LCD_BCK_PIN, PIN_MODE_OUTPUT);

	/* 通过引脚复位 LCD */

	rt_pin_write(LCD_BCK_PIN, PIN_LOW);

    rt_pin_write(LCD_RES_PIN, PIN_LOW);

    rt_thread_mdelay(12);

    rt_pin_write(LCD_RES_PIN, PIN_HIGH);

    /* 复位后延时一段时间，确保屏幕正常工作 */

    rt_thread_mdelay(12);

}

/**

 * @brief  初始化 LCD 所需的 SPI 外设

 *

 * @param  None

 * @retval int 操作结果

 */

static int lcd_spi_init(void)

{

    /* 配置 SPI 端口，并指定 CS 引脚为 PA4 */

    __HAL_RCC_GPIOA_CLK_ENABLE();

    rt_hw_spi_device_attach("spi1", "spi10", LCD_CS_PIN_TYPE, LCD_CS_PIN);

    /* 查找设备 */

    spi_dev_lcd = (struct rt_spi_device *)rt_device_find("spi10");

    if(RT_NULL == spi_dev_lcd)

    {

        LOG_E("Unable to find SPI device required for LCD");

        return RT_ERROR;

    }

    /* 配置 SPI */

    struct rt_spi_configuration cfg;

    cfg.data_width = 8;

    cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;

    cfg.max_hz = 42 * 1000 * 1000; /* 42M,SPI max 42MHz,lcd 4-wire spi */

    spi_dev_lcd->bus ->owner = spi_dev_lcd;

    rt_spi_configure(spi_dev_lcd, &cfg);

    return RT_EOK;

}

 /**

 * @brief  设置需要绘图的区域

 *

 * @param   x1      start of x position

 * @param   y1      start of y position

 * @param   x2      end of x position

 * @param   y2      end of y position

 * @retval None

 */

static void lcd_draw_area_set(rt_uint16_t x1, rt_uint16_t y1, rt_uint16_t x2, rt_uint16_t y2)

{

    lcd_write_cmd(0x2a);

    lcd_write_data(x1 >> 8);

    lcd_write_data(x1);

    lcd_write_data(x2 >> 8);

    lcd_write_data(x2);

    lcd_write_cmd(0x2b);

    lcd_write_data(y1 >> 8);

    lcd_write_data(y1);

    lcd_write_data(y2 >> 8);

    lcd_write_data(y2);

    lcd_write_cmd(0x2C);

}

/**

 * @brief  LCD 清屏，将整个屏幕设定为指定颜色

 *

 * @param  color 清空的颜色

 * @retval None

 */

static void lcd_clear_screen(rt_uint16_t color)

{

    rt_uint16_t i, j;

    rt_uint8_t data[2] = {0};

    data[0] = (color >> 8) & 0xFF;

    data[1] = color & 0xFF;

    /* 设置整个屏幕区域 */

    lcd_draw_area_set(0, 0, LCD_WIDTH - 1, LCD_HEIGHT - 1);

    /* 这里直接通过 SPI 发送数据，所以需要单独将数据引脚拉高 */

    rt_pin_write(LCD_DC_PIN, PIN_HIGH);

    if (_lcd.lcd_info.framebuffer != RT_NULL)

    {

        /* 重置缓冲区 */

        // memset(_lcd.lcd_info.framebuffer, color, _lcd.lcd_info.smem_len);

        for (j = 0; j < _lcd.lcd_info.smem_len / 2; j++)

        {

            _lcd.lcd_info.framebuffer[j * 2] =  data[0] ;

            _lcd.lcd_info.framebuffer[j * 2 + 1] = data[1];

        }

        rt_spi_send(spi_dev_lcd, _lcd.lcd_info.framebuffer, _lcd.lcd_info.smem_len);

    }

    else

    {

        for (i = 0; i < LCD_HEIGHT; i++)

        {

            for (j = 0; j < LCD_WIDTH; j++)

            {

                rt_spi_send(spi_dev_lcd, data, 2);

            }

        }

    }

}

/**

 * @brief  点亮 LED 屏幕

 * @param  None

 * @retval None

 */

static void lcd_display_on(void)

{

    rt_pin_write(LCD_BCK_PIN, PIN_HIGH);

}

/**

 * @brief  熄灭 LED 屏幕

 * @param  None

 * @retval None

 */

static void lcd_display_off(void)

{

    rt_pin_write(LCD_BCK_PIN, PIN_LOW);

}

/**

 * @brief  液晶显示器进入最小功耗模式，背光关闭

 * @param  None

 * @retval None

 */

static void lcd_enter_sleep(void)

{

    rt_pin_write(LCD_BCK_PIN, PIN_LOW);

    rt_thread_mdelay(5);

    lcd_write_cmd(0x10);

}

/**

 * @brief  液晶显示器关闭睡眠模式，背光灯打开

 * @param  None

 * @retval None

 */

static void lcd_exit_sleep(void)

{

    rt_pin_write(LCD_BCK_PIN, PIN_HIGH);

    rt_thread_mdelay(5);

    lcd_write_cmd(0x11);

    rt_thread_mdelay(120);

}

/**

 * @brief  设置光标位置

 * @param  Xpos 横坐标

 * @param  Ypos 纵坐标

 * @retval None

 */

// static void lcd_cursor_set(rt_uint16_t Xpos, rt_uint16_t Ypos)

// {

//     lcd_write_cmd(0x2A);

// 	lcd_write_data(Xpos>>8);

// 	lcd_write_data(Xpos&0XFF);

// 	lcd_write_cmd(0x2B);

// 	lcd_write_data(Ypos>>8);

// 	lcd_write_data(Ypos&0XFF);

// }

/**

 * @brief  LCD 驱动初始化

 * @param  device LCD 设备结构体

 * @retval None

 */

static rt_err_t drv_lcd_init(struct rt_device *device)

{

    LOG_D("drv_lcd_init!\n");

    if (lcd_spi_init() != RT_EOK)

    {

        return -RT_EINVAL;

    }

    lcd_gpio_init();

    if (lcd_dev_init() != RT_EOK)

    {

        return -RT_EINVAL;

    }

    /* 清屏 */

    lcd_clear_screen(WHITE);

    /* 初始化完成后，点亮屏幕 */

    rt_pin_write(LCD_BCK_PIN, PIN_HIGH);

    return RT_EOK;

}

/**

 * @brief  LCD 驱动的操作函数

 * @param  device LCD 设备结构体

 * @param  cmd 操作命令

 * @param  args 传入的参数

 * @retval None

 */

static rt_err_t drv_lcd_control(struct rt_device *device, int cmd, void *args)

{

    // struct drv_lcd_device *lcd = LCD_DEVICE(device);

    LOG_D("drv_lcd_control cmd is: %d\n", cmd);

    switch (cmd)

    {

        case RTGRAPHIC_CTRL_RECT_UPDATE:

        {

            rt_sem_take(&_lcd.lcd_lock, RT_TICK_PER_SECOND / 20);

            /* 刷新缓冲区 */

            if (_lcd.lcd_info.framebuffer)

            {

                /* 设置整个屏幕区域 */

                lcd_draw_area_set(0, 0, LCD_WIDTH - 1, LCD_HEIGHT - 1);

                /* 这里直接通过 SPI 发送数据，所以需要单独将数据引脚拉高 */

                rt_pin_write(LCD_DC_PIN, PIN_HIGH);

                rt_spi_send(spi_dev_lcd, _lcd.lcd_info.framebuffer, _lcd.lcd_info.smem_len);

            }

            /* 释放锁信号 */

            rt_sem_release(&_lcd.lcd_lock);

        }

        break;

        case RTGRAPHIC_CTRL_POWERON:

        {

            /* LCD 退出睡眠模式 */

            lcd_display_on();

            lcd_exit_sleep();

        }

        break;

        case RTGRAPHIC_CTRL_POWEROFF:

        {

            /* LCD 进入睡眠模式 */

            lcd_display_off();

            lcd_enter_sleep();

        }

        break;

        case RTGRAPHIC_CTRL_GET_INFO:

        {

            /* 获取 LCD 参数 */

            memcpy(args, &_lcd.lcd_info, sizeof(_lcd.lcd_info));

        }

        break;

        default:

            return -RT_EINVAL;

    }

    return RT_EOK;

}

/* 驱动函数实现的结构体 */

#ifdef RT_USING_DEVICE_OPS

const static struct rt_device_ops lcd_ops =

{

    drv_lcd_init,

    RT_NULL,

    RT_NULL,

    RT_NULL,

    RT_NULL,

    drv_lcd_control

};

#endif

/**

 * @brief  LCD 设备注册

 *

 * @param  None

 * @retval int 注册结果

 */

int drv_lcd_hw_init(void)

{

    rt_err_t result = RT_EOK;

    rt_uint32_t lcd_buff_size = lcd_buff_size = LCD_HEIGHT * LCD_WIDTH * 2;

    /* 创建LCD设备对象 */

    struct rt_device *device = &_lcd.lcd_dev;

    memset(&_lcd, 0x00, sizeof(_lcd));

    LOG_D("drv_lcd_hw_init!\n");

    /* 初始化lcd_lock信号量 */

    result = rt_sem_init(&_lcd.lcd_lock, "lcd_lock", 0, RT_IPC_FLAG_FIFO);

    if (result != RT_EOK)

    {

        LOG_E("init semaphore failed!\n");

        result = -RT_ENOMEM;

        goto __exit;

    }

    /* 设置 LCD 设备信息 */

    _lcd.lcd_info.height = LCD_HEIGHT;

    _lcd.lcd_info.width = LCD_WIDTH;

    _lcd.lcd_info.bits_per_pixel = LCD_BITS_PER_PIXEL;

    _lcd.lcd_info.pixel_format = RTGRAPHIC_PIXEL_FORMAT_RGB565;     // 图像的格式（RGB：565）

    /* LCD 显示缓冲区，大小为显示一帧图像所需空间 */

    _lcd.lcd_info.smem_len = lcd_buff_size;

    _lcd.lcd_info.framebuffer = rt_malloc(lcd_buff_size);

    if (_lcd.lcd_info.framebuffer == RT_NULL)

    {

        LOG_E("init frame buffer failed!\n");

        result = -RT_ENOMEM;

        goto __exit;

    }

    /* 将缓冲区初始化为 0xFF */

    memset(_lcd.lcd_info.framebuffer, 0xFF, lcd_buff_size);

#ifdef RT_USING_DEVICE_OPS

    device->ops     = &lcd_ops;

#else

    device->init    = drv_lcd_init;

    device->control = drv_lcd_control;

#endif

    /* 注册 LCD 设备 */

    rt_device_register(device, "lcd", RT_DEVICE_FLAG_RDWR);

__exit:

    if (result != RT_EOK)

    {

        rt_sem_detach(&_lcd.lcd_lock);

        if (_lcd.lcd_info.framebuffer)

        {

            rt_free(_lcd.lcd_info.framebuffer);

        }

    }

    return result;

}

INIT_DEVICE_EXPORT(drv_lcd_hw_init);

#endif /* BSP_USING_LCD */

STM32 + RTThread + UGUI的相关教程结束。