MultiMediaCard Protocol - USB Mass Storage: Designing and Programming Devices and Embedded Hosts - page 126

Error:
// On error or completion of the delay, turn off the timer and disable its interrupt.
TMR1ON = 0;
TMR1IE = 0;
}

A Function for Initializing
The MediaInitialize function performs initialization tasks and returns status
in an SDC_Error structure. The function accepts a pointer to an SDC-
STATE structure and sets the states of the structure's two members. The
function uses the 512-byte msd_buffer array introduced in Chapter 3 to
hold data read from the card's storage media. The function calls the Open-
SPI function from Chapter 4.
SDC_Error MediaInitialize(SDCSTATE *Flag)
{
SDC_Error CSDstatus = sdcValid;

SDC_RESPONSE response;

SDC_Error status = sdcValid;

word timeout;

Flag -> _byte = 0x0;

// Deselect the card.
SDC_CS = 1;
// Open the SPI port.
// Clock speed must be <= 400 kHz until the card is initialized
// and the CSD register has been read.
// MultiMediaCards require CKE = 0, CKP = 1,
// and sampling DataOut in the middle of a clock cyle.

OpenSPI(SPI_FOSC_64, MODE_11, SMPMID);

// Allow the card time to initialize.

Delayms(100);