Mikroelektronika MIKROE-742 데이터 시트

273

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

function Mmc_Init(): byte;

- 

0

- if MMC/SD card was detected and successfully initialized 

- 

1

- otherwise 

Initializes MMC through hardware SPI interface.

Parameters:

- 

port

: chip select signal port address. 

- 

cspin

: chip select pin. 

Global variables : 

- 

Mmc_Chip_Select

: Chip Select line 

- 

Mmc_Chip_Select_Direction

: Direction of the Chip Select pin 

must be defined before using this function. 
The appropriate hardware SPI module must be previously initialized. See the
SPI1_Init, SPI1_Init_Advanced routines.

// MMC module connections
var Mmc_Chip_Select : sbit; sfr; at PORTB.B2;
var Mmc_Chip_Select_Direction : sbit; sfr; at DDRB.B2;
// MMC module connections

error = Mmc_Init();  // Init with CS line at PORTB.B2
var i : byte;
...
SPI1_Init_Advanced(_SPI_MASTER, _SPI_FCY_DIV2, _SPI_CLK_LO_LEAD-

ING);

Spi_Rd_Ptr := @SPI1_Read;    // Pass pointer to SPI Read func-
tion of used SPI module
i = Mmc_Init();