SD/MMC SPI BSP Overview

An SPI BSP is required so that the SD/MMC SPI driver will work on a particular system. For more information about these functions, see SPI BSP.

Function	Description
`FSDev_SD_SPI_BSP_SPI_Open()`	Open (initialize) SPI
`FSDev_SD_SPI_BSP_SPI_Close()`	Close (uninitialize) SPI
`FSDev_SD_SPI_BSP_SPI_Lock()`	Acquire SPI lock
`FSDev_SD_SPI_BSP_SPI_Unlock()`	Release SPI lock
`FSDev_SD_SPI_BSP_SPI_Rd()`	Read from SPI
`FSDev_SD_SPI_BSP_SPI_Wr()`	Write to SPI
`FSDev_SD_SPI_BSP_SPI_ChipSelEn()`	Enable chip select
`FSDev_SD_SPI_BSP_SPI_ChipSelDis()`	Disable chip select
`FSDev_SD_SPI_BSP_SPI_SetClkFreq()`	Set SPI clock frequency