Struct SPIController 

#[repr(C)]
pub struct SPIController {
    pub data: RW<u8>,
    pub control: RW<u8>,
}

SPI controller connected to the SD card connector

The speed of the clock output of the SPI controller can be controlled by the ‘Slow Clock’ bit. When this bit is 0 the clock is 12.5MHz, when 1 the clock is about 390kHz. The slow clock speed is to be used during the initialization phase of the SD card. Some SD cards require a clock less than 400kHz during part of the initialization. A transfer can be started by writing to SPI_DATA. While the transfer is in progress the BUSY bit will be set. After the transfer is done, the result can be read from the SPI_DATA register. The chip select can be controlled by writing the SELECT bit. Writing 1 will assert the chip-select (logic-0) and writing 0 will release the chip-select (logic-1).

Fields

data: RW<u8>

control: RW<u8>