LVGL的默认字体不显示

发布于 2023-06-21 10:30:46 浏览：566 订阅该版

请问大伙，下图所示的情况大家遇到过吗？可能是什么问题导致的？

UI代码是这样的：
![微信图片_20230621102348.jpg](https://oss-club.rt-thread.org/uploads/20230621/4936e2a44a7ddc975cbc4da920ce5fa8.jpg.webp)
但是显示效果却是这样的：
![微信图片_20230621102317.jpg](https://oss-club.rt-thread.org/uploads/20230621/60e408470a38bda651f2c0b376070d38.jpg.webp)

附上UI代码和应该有的显示效果：
```c
void lv_example_btn_1(void)
{
    lv_obj_t * label;

lv_obj_t * btn1 = lv_btn_create(lv_scr_act());
    lv_obj_add_event_cb(btn1, event_handler, LV_EVENT_ALL, NULL);
    lv_obj_align(btn1, LV_ALIGN_CENTER, 0, -40);

label = lv_label_create(btn1);
    lv_label_set_text(label, "Button1");
    lv_obj_center(label);

lv_obj_t * btn2 = lv_btn_create(lv_scr_act());
    lv_obj_add_event_cb(btn2, event_handler, LV_EVENT_ALL, NULL);
    lv_obj_align(btn2, LV_ALIGN_CENTER, 0, 40);
    lv_obj_add_flag(btn2, LV_OBJ_FLAG_CHECKABLE);
    lv_obj_set_height(btn2, LV_SIZE_CONTENT);

label = lv_label_create(btn2);
    lv_label_set_text(label, "Toggle1");
    lv_obj_center(label);
}
```
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230621/680bd809b57e5c5db766b60d3e404faf.png)

海皮就是鳄鱼 2023-06-21

okay

EEXG_1727 2023-06-21

请多指教

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2 个回答

EEXG_1727 2023-06-21

请多指教

故障已经排除，是因为LCD初始化不正确导致的，下面是我修改后的LCD初始化代码：
```c
//初始化lcd
//该初始化函数具有旋转屏幕方向的功能
//屏幕驱动用的是ILI9341

void LCD_Init(u8 screen_rotation/*屏幕方向*/)
{
    /*初始化相关外设*/
    InitPeripheral((char*)0);

LCD_REST = 1;
    opt_delay(250);
    opt_delay(250);
    opt_delay(250);
    LCD_REST=0;
    opt_delay(250); //
    opt_delay(250); //
    opt_delay(250); //
    LCD_REST=1;
    opt_delay(250); //
    opt_delay(250); //
    opt_delay(250); //

lcddev.width=240;
    lcddev.height=320;
    lcddev.wramcmd=0X2C;
    lcddev.setxcmd=0X2A;
    lcddev.setycmd=0X2B;

LCD_WR_REG(0xCF);
    LCD_WR_DATA8(0x00);
    LCD_WR_DATA8(0xD9);
    LCD_WR_DATA8(0X30);

LCD_WR_REG(0xED);
    LCD_WR_DATA8(0x64);
    LCD_WR_DATA8(0x03);
    LCD_WR_DATA8(0X12);
    LCD_WR_DATA8(0X81);

LCD_WR_REG(0xE8);
    LCD_WR_DATA8(0x85);
    LCD_WR_DATA8(0x10);
    LCD_WR_DATA8(0x78);

LCD_WR_REG(0xCB);
    LCD_WR_DATA8(0x39);
    LCD_WR_DATA8(0x2C);
    LCD_WR_DATA8(0x00);
    LCD_WR_DATA8(0x34);
    LCD_WR_DATA8(0x02);

LCD_WR_REG(0xF7);
    LCD_WR_DATA8(0x20);

LCD_WR_REG(0xEA);
    LCD_WR_DATA8(0x00);
    LCD_WR_DATA8(0x00);

LCD_WR_REG(0xC0);    //Power control
    LCD_WR_DATA8(0x21);   //VRH[5:0]

LCD_WR_REG(0xC1);    //Power control
    LCD_WR_DATA8(0x12);   //SAP[2:0];BT[3:0]

LCD_WR_REG(0xC5);    //VCM control
    LCD_WR_DATA8(0x32);
    LCD_WR_DATA8(0x3C);

LCD_WR_REG(0xC7);    //VCM control2
    LCD_WR_DATA8(0XC1);

LCD_WR_REG(0x36);
    opt_delay(10);
    switch(screen_rotation)
        {
            case 0: //0度旋转
                LCD_WR_DATA8(0x08);
                lcddev.width = 240;
                lcddev.height = 320;
                LCD_WR_REG(0x2A);     //set the page address 竖屏幕设置
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0xEF);
                LCD_WR_REG(0x2B);    //set the column address
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x01);
                LCD_WR_DATA8(0x3F);
                break;
            case 1: //左横屏（排线在左边）
                LCD_WR_DATA8((1<<5)|(0<<6)|(1<<7)|(1<<3));
                lcddev.width  = 320;
                lcddev.height = 240;
                LCD_WR_REG(0x2B);     //set the page address 横屏幕设置
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0xEF);
                LCD_WR_REG(0x2A);    //set the column address
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x01);
                LCD_WR_DATA8(0x3F);
                break;
            case 2: //180度旋转，反向竖屏
                LCD_WR_DATA8(0x80);
                lcddev.width  = 240;
                lcddev.height = 320;
                LCD_WR_REG(0x2A);     //set the page address 竖屏幕设置
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0xEF);
                LCD_WR_REG(0x2B);    //set the column address
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x01);
                LCD_WR_DATA8(0x3F);
                break;
            case 3: //右横屏（排线在右边）
                LCD_WR_DATA8((1<<5)|(1<<6));
                lcddev.width  = 320;
                lcddev.height = 240;
                LCD_WR_REG(0x2B);     //set the page address 横屏幕设置
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0xEF);
                LCD_WR_REG(0x2A);    //set the column address
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x00);
                LCD_WR_DATA8(0x01);
                LCD_WR_DATA8(0x3F);
                break;
            default:
                //EXIT IF SCREEN ROTATION NOT VALID!
                break;
        }
    LCD_WR_REG(0x3A);
    LCD_WR_DATA8(0x55);

LCD_WR_REG(0xB1);
    LCD_WR_DATA8(0x00);
    LCD_WR_DATA8(0x18);

LCD_WR_REG(0xB6);    // Display Function Control
    LCD_WR_DATA8(0x0A);
    LCD_WR_DATA8(0xA2);

LCD_WR_REG(0xF2);    // 3Gamma Function Disable
    LCD_WR_DATA8(0x00);

LCD_WR_REG(0x26);    //Gamma curve selected
    LCD_WR_DATA8(0x01);

LCD_WR_REG(0xE0);    //Set Gamma
    LCD_WR_DATA8(0x0F);
    LCD_WR_DATA8(0x20);
    LCD_WR_DATA8(0x1E);
    LCD_WR_DATA8(0x09);
    LCD_WR_DATA8(0x12);
    LCD_WR_DATA8(0x0B);
    LCD_WR_DATA8(0x50);
    LCD_WR_DATA8(0XBA);
    LCD_WR_DATA8(0x44);
    LCD_WR_DATA8(0x09);
    LCD_WR_DATA8(0x14);
    LCD_WR_DATA8(0x05);
    LCD_WR_DATA8(0x23);
    LCD_WR_DATA8(0x21);
    LCD_WR_DATA8(0x00);

LCD_WR_REG(0XE1);    //Set Gamma
    LCD_WR_DATA8(0x00);
    LCD_WR_DATA8(0x19);
    LCD_WR_DATA8(0x19);
    LCD_WR_DATA8(0x00);
    LCD_WR_DATA8(0x12);
    LCD_WR_DATA8(0x07);
    LCD_WR_DATA8(0x2D);
    LCD_WR_DATA8(0x28);
    LCD_WR_DATA8(0x3F);
    LCD_WR_DATA8(0x02);
    LCD_WR_DATA8(0x0A);
    LCD_WR_DATA8(0x08);
    LCD_WR_DATA8(0x25);
    LCD_WR_DATA8(0x2D);
    LCD_WR_DATA8(0x0F);

LCD_WR_REG(0x11); //Exit Sleep
    opt_delay(250); //
    opt_delay(250); //
    opt_delay(250); //
    LCD_WR_REG(0x29); //display on
    opt_delay(250); //
    opt_delay(250); //
    opt_delay(250); //
//经调，初始化指令发送正常
    LCD_Clear(WHITE);
}
```