本实验将实现如下功能：开机的时候先初始化SD卡，如果SD卡初始化完成，则读取扇区0的数据，然后通过串口打印到电脑上。如果没初始化通过，则在LCD上提示初始化失败。 同样用DS0来指示程序正在运行。-The experiment will achieve the following functions: boot time to initialize the SD card, if the SD card initialization is complete, the data is read sector 0, and then print to the computer through the serial port. If you do not initialize the pass, on the LCD prompts initialization failed. Similarly with DS0 to indicate the program is running.