/*****************************************************************************\*                     EFSL - Embedded Filesystems Library                     **                     -----------------------------------                     **                                                                             ** Filename : atmega_spi.c                                                     ** Release  : 0.3 - devel                                                      ** Description : This file contains the functions needed to use efs for        **               accessing files on an SD-card connected to an ATMega's.       **                                                                             ** This program is free software; you can redistribute it and/or               ** modify it under the terms of the GNU General Public License                 ** as published by the Free Software Foundation; version 2                     ** of the License.                                                             **                                                                             ** This program is distributed in the hope that it will be useful,             ** but WITHOUT ANY WARRANTY; without even the implied warranty of              ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               ** GNU General Public License for more details.                                **                                                                             ** As a special exception, if other files instantiate templates or             ** use macros or inline functions from this file, or you compile this          ** file and link it with other works to produce a work based on this file,     ** this file does not by itself cause the resulting work to be covered         ** by the GNU General Public License. However the source code for this         ** file must still be made available in accordance with section (3) of         ** the GNU General Public License.                                             **                                                                             ** This exception does not invalidate any other reasons why a work based       ** on this file might be covered by the GNU General Public License.            **                                                                             **                                                    (c)2006 Lennart Yseboodt **                                                    (c)2006 Michael De Nil   *\*****************************************************************************//*****************************************************************************/#include "include/atmega_spi.h"/*****************************************************************************/euint8 atmega_spi_init(atmegaSpiInterface *iface){	euint8 i;		/* Unselect card */	PORTB |= iface->pinSelect;		/* Set as master, clock and chip select output */	DDR_SPI = (1<<DD_MOSI) | (1<<DD_SCK) | 1;	/* Enable SPI, master, set clock rate to fck/2 */	SPCR = (1<<SPE) | (1<<MSTR); /* fsck / 4 */	SPSR = 1; /* fsck / 2 */	/* Send 10 spi commands with card not selected */	for(i=0;i<10;i++)		atmega_spi_send(iface,0xff);	/* Select card */	PORTB &= ~(iface->pinSelect);	return(0);}/*****************************************************************************/euint8 atmega_spi_send(atmegaSpiInterface *iface, euint8 data){	euint8 incoming=0;		PORTB &= ~(iface->pinSelect);		SPDR = data;	while(!(SPSR & (1<<SPIF)))		incoming = SPDR;	PORTB |= iface->pinSelect;	return(incoming);}/*****************************************************************************/