读取SD卡类型和容量高程序 1.更一步的掌握液晶屏的驱动程序 2.学习SD卡的驱动程序。 3.掌握如何计算容量和操作SD卡CSD、CID寄存器 * -Read high capacity SD card type and procedures 1. More step to master LCD driver 2. Learning SD card driver. 3. To grasp how to calculate the capacity and operation