mmc_sd.h

基于ATmega64单片机以及vs1003的SD卡方案的MP3播放源代码

/*******************************************************************/
/*          SD diriver for  MP3 Player                             */
/*                                                                 */
/* Platform   : AVRStudio4.13 b528 + WinAVR20070525                */
/*              optimize -0s                                       */
/* Author     : bozai(Zhang Qibo)                                  */
/* E-mail     : [e-mail]                                    */
/* MSN        : [e-mail]                         */
/* Date       : 2006-06-16                                         */
/*******************************************************************/
/*  2007-10-21: Rewrite some function, now only suply 4 functions  */
/*  2007-10-18: Adjust some time & retry count for compatibility   */
/*              consideration                                      */
/*  2007-06-16: After reading the spec. in detail, I found some    */
/*              of the code don't meet the spec., that is after    */
/*              the last SPI transaction, it need an extra 8 CLK   */
/*              to finish it's work                                */
/*  2007-05-04: add read capacity function                         */
/*  2007-04-21:                                                    */
/*  Enable some code incase that when SD reset                     */
/*  faild program can't jump the loop                              */
/*******************************************************************/

#ifndef __MMC_SD_h__
#define __MMC_SD_h__

#define uint8  unsigned char
#define  int8    signed char
#define uint16 unsigned int
#define  int16   signed int
#define uint32 unsigned long
#define  int32   signed long

#define MMC_SD_CS_DDR  DDRB
#define MMC_SD_CS_PORT PORTB
#define MMC_SD_CS_BIT  0

#define MMC_SD_SCK_DDR  DDRB
#define MMC_SD_SCK_PORT PORTB
#define MMC_SD_SCK_BIT  1

#define MMC_SD_MOSI_DDR  DDRB
#define MMC_SD_MOSI_PORT PORTB
#define MMC_SD_MOSI_BIT  2

#define MMC_SD_MISO_DDR  DDRB
#define MMC_SD_MISO_PORT PORTB
#define MMC_SD_MISO_BIT  3

/****************************************************************/

#define MMC_SD_PORT_INI  {\
							MMC_SD_CS_PORT |= 1<<MMC_SD_CS_BIT;\
							MMC_SD_SCK_PORT |= 1<<MMC_SD_SCK_BIT;\
							MMC_SD_MOSI_PORT |= 1<<MMC_SD_MOSI_BIT;\
							MMC_SD_MISO_PORT |= 1<<MMC_SD_MISO_BIT;\
							\
							MMC_SD_CS_DDR |= 1<<MMC_SD_CS_BIT;\
							MMC_SD_SCK_DDR |= 1<<MMC_SD_SCK_BIT;\
							MMC_SD_MOSI_DDR |= 1<<MMC_SD_MOSI_BIT;\
							MMC_SD_MISO_DDR &= ~(1<<MMC_SD_MISO_BIT);\
						}							

#define SPI_CS_Assert   MMC_SD_CS_PORT &= ~(1<<MMC_SD_CS_BIT)  
#define SPI_CS_Deassert MMC_SD_CS_PORT |=  1<<MMC_SD_CS_BIT


uint8 MMC_SD_Init(void);
uint8 MMC_SD_ReadSingleBlock(uint32 sector, uint8* buffer);
uint8 MMC_SD_WriteSingleBlock(uint32 sector, uint8* buffer);
uint32 MMC_SD_ReadCapacity(void);

#endif