SD卡的操作函数,适用于STM32，包括初始化，已经读写操作-SD card manipulation functions， STM32

最近在学习STM32，在学习的过程中，对相关知识进行了总结，包括ADC转换，sd卡使用，DMA控制等内容。-In the learning of stm32 in the process of learning, knowledge is summarized, including the ADC conversion, sd card, DMA control.

STM32最小系统及相应外围电路的设计原理图，包含串口、网口、sd卡、触摸屏等模块-STM32 minimum system and the corresponding peripheral circuit design schematics, including serial, Ethernet port, sd card, touch screen and other modules