关于字库的问题

小败 · 发表于 2016-3-17 19:30:02

      while(font_init())                      //检查字库
      {

            LCD_Clear(WHITE);                         //清屏
            POINT_COLOR=RED;                      //设置字体为红色
            LCD_ShowString(30,50,200,16,16,"ELITE STM32F103 ^_^");
            while(SD_Init())                      //检测SD卡
            {
                     LCD_ShowString(30,70,200,16,16,"SD Card Failed!");
                     delay_ms(200);
                     LCD_Fill(30,70,200+30,70+16,WHITE);
                     delay_ms(200);
            }
            LCD_ShowString(30,70,200,16,16,"SD Card OK");
            LCD_ShowString(30,90,200,16,16,"Font Updating...");
            key=update_all_font(20,110,16,"0:");//更新字库
            while(key)//更新失败
            {
                     LCD_ShowString(30,110,200,16,16,"Font Update Failed!");
                     delay_ms(200);
                     LCD_Fill(20,110,200+20,110+16,WHITE);
                     delay_ms(200);
            }
            LCD_ShowString(30,110,200,16,16,"Font Update Success! ");
            delay_ms(1500);
            LCD_Clear(WHITE);//清屏
      }

为什么程序一直在这里循环，可能有什么原因？