## 树莓派RP2040对SD卡的支持

[[https://github.com/carlk3/no-OS-FatFS-SD-SPI-RPi-Pico|针对树莓派Pico的简化SD卡库]]，用C写：
  * Supports multiple SD Cards
  * Supports multiple SPIs
  * Supports multiple SD Cards per SPI
  * Supports Real Time Clock for maintaining file and directory time stamps
  * Supports Cyclic Redundancy Check (CRC)
  * Plus all the neat features provided by FatFS