STM32 + RTThread + UGUI

澆築菜鳥發表於2023-04-28

一、概述

  • 開發板:STM32F103C8T6
  • 顯示器:ST7735S
  • RT-Thread:5.0.0

玩過 GUI 的小夥伴都知道,介面的顯示是一個個畫素點組合起來的,那麼直接構建出來炫酷的 GUI 還是相對比較困難的,所以我們一般都會使用一些 GUI 庫來實現,比如 LVGL、QT、UGUI等,這樣對於驅動開發的人員來說就相對比較簡單了,

圖形庫應用的核心思想只需要提供一幀的緩衝區,我們只需要不斷的將緩衝區的資料寫入到 LCD 中即可,而緩衝區的內容由圖形庫實現,需要注意的是這個緩衝的建立方式,有的圖形庫會自己建立緩衝區,我們只需要負責重新整理 LCD 的顯示即可,而有的圖形庫是由驅動提供緩衝區,圖形庫負責寫入。

二、RT-Thread 移植

移植 RT-Thread 不是此文章的重點,可以參考一下我之前的筆記,或者直接使用 RT-Thread Studio、STM32CubeMX等工具直接生成,這裡我就不過多介紹了

三、LCD 驅動

使用過 RT-Thread 的小夥伴,都知道 RT-Thread 目前還不能直接使用工具生成我們想要的 LCD 驅動,所以這裡我們只能根據標準的驅動進行編寫了

  1. 驅動函式結構體

    /* 驅動函式實現的結構體 */
    #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
    
  2. 註冊 LCD 裝置

    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;
        
        /* 建立LCD裝置物件 */
        struct rt_device *device = &_lcd.lcd_dev;
        memset(&_lcd, 0x00, sizeof(_lcd));
    
        LOG_D("drv_lcd_hw_init!\n");
        
        /* 初始化lcd_lock訊號量 */
        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;
        }
        
        /* 設定 LCD 裝置資訊 */
        _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;     // 影像的格式(RGB:565)
        
        /* LCD 顯示緩衝區,大小為顯示一幀影像所需空間 */
        _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;
        }
        /* 將緩衝區初始化為 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
    
        /* 註冊 LCD 裝置 */
        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;
        
    }
    
  3. LCD 控制函式的實現

    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);
                /* 重新整理緩衝區 */
    
                rt_sem_release(&_lcd.lcd_lock);
            }
            break;
            
            case RTGRAPHIC_CTRL_POWERON:
            {
                /* LCD 退出睡眠模式 */
            }
            break;
            
            case RTGRAPHIC_CTRL_POWEROFF:
            {
                /* LCD 進入睡眠模式 */
            }
            break;
            
            case RTGRAPHIC_CTRL_GET_INFO:
            {
                /* 獲取 LCD 引數 */
                memcpy(args, &_lcd.lcd_info, sizeof(_lcd.lcd_info));
            }
            break;
        
            default:
                return -RT_EINVAL;
        }
    
        return RT_EOK;
    }
    
    
  4. LCD 驅動功能實現
    剩下的就比較簡單了,只需要參考 LCD 提供的案例程式進行更改就好了,主要有實現如下

    • drv_lcd_init: 完成 LCD 的復位、初始化、首次清屏工作
    • drv_lcd_control: 完成 LCD 顯示區域的重新整理、螢幕引數的返回、亮屏和息屏等工作
      注意:具體實現參考後面的程式原始碼,相對比較簡單,這裡就不過多介紹了

四、UGUI 介紹

  1. 介紹
    µGUI 是一個用於嵌入式系統的免費開源圖形庫。 它獨立於平臺,可以輕鬆移植到幾乎任何微控制器系統。 只要顯示器能夠顯示圖形,μGUI 就不受某種顯示技術的限制。 因此,支援LCD、TFT、E-Paper、LED或OLED等顯示技術。 整個模組由兩個檔案組成:ugui.c 和 ugui.h。
    注意:這裡的介紹我直接引用了作者的描述

  2. 獲取 UGUI
    github:https://github.com/xidongxu/ugui

  3. 檔案目錄

  4. 使用介紹

    • 移植: 我們主要實現 ugui_port.c,這裡下載時已經提供了案例,所以我只需要在其中進行簡單的修改
    • 使用: 使用相對比較簡單,直接參考 “µGUI v0.3.pdf” 文件即可,直接沒有難度

五、UGUI 移植

  1. 初始化
    直接在 ugui_port.c 檔案中使用 INIT_COMPONENT_EXPORT(ugui_port_init) 進行自動初始化,如下圖所示:

  2. lcd_open 函式
    這裡不要做任何更改,從函式中可以看出 LCD 相關的引數獲取,如下圖所示:

  3. lcd_draw_pixel 函式
    主要功能是在緩衝區中寫入一個畫素點的顏色,如下圖所示:

  4. ugui_port_thread_entry 函式
    這是執行緒的入口函式,主要目的是定期將緩衝區的資料寫入到 LCD 中,下圖所示:

注意:從以上步奏可以看出,移植 UGUI 時不需要更改任何引數,只需要在初始化時呼叫 ugui_port_init 函式即可。

六、程式原始碼

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 高畫素
#define LCD_WIDTH                       128      // LCD 寬畫素
#define LCD_BITS_PER_PIXEL              16      // 畫素點的資料寬度

#define LCD_CS_PIN_TYPE                 GPIOA               // CS 引腳所在的組
#define LCD_CS_PIN                      GPIO_PIN_4          // 引腳編號
#define LCD_BCK_PIN                     GET_PIN(B, 1)       // 背光引腳
#define LCD_DC_PIN                      GET_PIN(B, 8)       // 資料引腳
#define LCD_RES_PIN                     GET_PIN(B, 9)       // 復位引腳

#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

/***************************************************************
檔名 : drv_lcd_st7735s.c
作者 : jiaozhu
版本 : V1.0
描述 : st7735s 顯示驅動
其他 : 無
日誌 : 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 命令寫入,寫入時資料引腳為低電平
 *
 * @param  cmd 命令
 * @retval 返回執行結果
 */
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 資料寫入,寫入時資料引腳為高電平
 *
 * @param  cmd 命令
 * @retval 返回執行結果
 */
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 板級初始化
 *
 * @param  None
 * @retval int 初始化結果
 */
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 所需的引腳,並透過引腳復位 LCD
 *
 * @param  None
 * @retval None
 */
static void lcd_gpio_init(void)
{
    /* 配置引腳模式 */
    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);
	
	/* 透過引腳復位 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);
   
    /* 復位後延時一段時間,確保螢幕正常工作 */
    rt_thread_mdelay(12);
}

/**
 * @brief  初始化 LCD 所需的 SPI 外設
 *
 * @param  None
 * @retval int 操作結果
 */
static int lcd_spi_init(void)
{
    /* 配置 SPI 埠,並指定 CS 引腳為 PA4 */
    __HAL_RCC_GPIOA_CLK_ENABLE();
    rt_hw_spi_device_attach("spi1", "spi10", LCD_CS_PIN_TYPE, LCD_CS_PIN);
    
    /* 查詢裝置 */
    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  設定需要繪圖的區域
 *
 * @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,將整個螢幕設定為指定顏色
 *
 * @param  color 清空的顏色
 * @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;
    
    /* 設定整個螢幕區域 */
    lcd_draw_area_set(0, 0, LCD_WIDTH - 1, LCD_HEIGHT - 1);
    
    /* 這裡直接透過 SPI 傳送資料,所以需要單獨將資料引腳拉高 */
    rt_pin_write(LCD_DC_PIN, PIN_HIGH);
    
    if (_lcd.lcd_info.framebuffer != RT_NULL)
    {
        /* 重置緩衝區 */
        // 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  點亮 LED 螢幕
 * @param  None
 * @retval None
 */
static void lcd_display_on(void)
{
    rt_pin_write(LCD_BCK_PIN, PIN_HIGH);
}

/**
 * @brief  熄滅 LED 螢幕
 * @param  None
 * @retval None
 */
static void lcd_display_off(void)
{
    rt_pin_write(LCD_BCK_PIN, PIN_LOW);
}

/**
 * @brief  液晶顯示器進入最小功耗模式,背光關閉
 * @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  液晶顯示器關閉睡眠模式,背光燈開啟
 * @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  設定游標位置
 * @param  Xpos 橫座標
 * @param  Ypos 縱座標
 * @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 驅動初始化
 * @param  device LCD 裝置結構體
 * @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);
    
    /* 初始化完成後,點亮螢幕 */
    rt_pin_write(LCD_BCK_PIN, PIN_HIGH);
    
    return RT_EOK;
}

/**
 * @brief  LCD 驅動的操作函式
 * @param  device LCD 裝置結構體
 * @param  cmd 操作命令
 * @param  args 傳入的引數
 * @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);
            /* 重新整理緩衝區 */
            if (_lcd.lcd_info.framebuffer)
            {
                /* 設定整個螢幕區域 */
                lcd_draw_area_set(0, 0, LCD_WIDTH - 1, LCD_HEIGHT - 1);
                /* 這裡直接透過 SPI 傳送資料,所以需要單獨將資料引腳拉高 */
                rt_pin_write(LCD_DC_PIN, PIN_HIGH);
                rt_spi_send(spi_dev_lcd, _lcd.lcd_info.framebuffer, _lcd.lcd_info.smem_len);
            }
            
            /* 釋放鎖訊號 */
            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 進入睡眠模式 */
            lcd_display_off();
            lcd_enter_sleep();
        }
        break;
        
        case RTGRAPHIC_CTRL_GET_INFO:
        {
            /* 獲取 LCD 引數 */
            memcpy(args, &_lcd.lcd_info, sizeof(_lcd.lcd_info));
        }
        break;
        
    
        default:
            return -RT_EINVAL;
    }

    return RT_EOK;
}




/* 驅動函式實現的結構體 */
#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 裝置註冊
 *
 * @param  None
 * @retval int 註冊結果
 */
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;
    
    /* 建立LCD裝置物件 */
    struct rt_device *device = &_lcd.lcd_dev;
    memset(&_lcd, 0x00, sizeof(_lcd));

    LOG_D("drv_lcd_hw_init!\n");
    
    /* 初始化lcd_lock訊號量 */
    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;
    }
    
    /* 設定 LCD 裝置資訊 */
    _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;     // 影像的格式(RGB:565)
    
    /* LCD 顯示緩衝區,大小為顯示一幀影像所需空間 */
    _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;
    }
    /* 將緩衝區初始化為 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

    /* 註冊 LCD 裝置 */
    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 */



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