Block device operations
Low Level SPI driver operations
The ECSD_LowLevel_EnableFastClock enables or disables the fast SPI clock.
During startup and card detection a slow clock is used for compatibility with MMC cards. If called with FALSE, the slow clock should be enabled for SPI. The slow clock can not be faster than 400 kHz. If called with TRUE, the fast clock should be enabled for SPI. The fast clock can not be faster than 25 MHz (20MHz if you plan to use MMC cards). Note: You should never call this function directly. The API documentation is present to allow you to write your own low level driver optimized for your hardware.
No return value.
This must be called before accessing files on the disk.