/* 
 * MP3Player version 1.3
 * Last updated: 04-Nov-2004, 17:00
 */
 

#define LCD_LINES 	4
#define LCD_CHARS 	20
#define LCD_SET_DDRAM 0x80

#define SONG_OFFSET 2
#define PP_OFFSET 6
#define RND_OFFSET 	3
#define RPT_OFFSET 	12
#define CH_CURSOR 	'>'
#define CH_SPACE 	' '
#define MSG_WLC1 	" T2NG - NOT ANOTHER"
#define MSG_WLC2 	"    IPOD CLONE !"
#define MSG_NOMMC1 	"      THANH!!      "
#define MSG_NOMMC2  "  Where's My Card? "
#define MSG_PLAY 	"Playing:"
#define MSG_PAUSE 	"[Paused]"
#define MSG_RND 	"<RND>"
#define MSG_RPT 	"<RPT>"
#define MSG_BLANK 	" "

#define MP3_PI19 	0x01
#define MP3_I2CD 	0x02
#define MP3_I2CC 	0x04
#define MP3_PR 		0x08
#define MP3_PCS 	0x10
#define MP3_POR 	0x20

#define MP3_SID 	0x40
#define MP3_SIC 	0x80

#define MMC_CS		0x01

#define MMC_SECTOR_SIZE 	512
#define FN_RECORD_LENGTH 	13
#define DIR_RECORD_LENGTH	32
#define FAT_ENTRY_LENGTH 	2

#define FILENAME_RECORDS 	8
#define MAX_FILES			100

#define FAT_ATTR_OFFSET 	11
#define FAT_SEQ_OFFSET 		0
#define FAT_READONLY		0x01
#define FAT_HIDDEN			0x02
#define FAT_SYSTEM			0x04
#define FAT_VOLUME			0x08
#define FAT_DIRECTORY		0x10
#define FAT_ARCHIVE			0x20
#define FAT_LFN				0x0F
#define FAT_HSVD 			0x1E
#define FAT_LFN_ERASED 		0x80
#define FAT_SFN_ERASED 		0xE5
#define FAT_LFN_SEQNUM		0x3F
#define FAT_EOF				0x00

#define PB_UP 				0x01
#define PB_DOWN 			0x02
#define PB_LEFT 			0x04
#define PB_RIGHT 			0x08
#define PB_STOP 			0x10
#define PB_PLAY 			0x20
#define PB_ALL 				0x3F

#define PB_DELAY 			100000
#define MP3_DELAY 			100000
#define MMC_TIMEOUT 		80
#define PREV_LIMIT 			24

enum MMCResp {
	MMC_OK,
	MMC_OKDATA
};

enum LCDRegSel {
	LCD_IR = 0x00,
	LCD_DR = 0x02
};

enum SongBreak {
	NO_BREAK,
	PLAY_THIS,
	PLAY_NEXT
};

enum PlayState {
	PAUSE,
	PLAY
};


typedef unsigned char byte;

volatile byte *MMCPort = (byte *) (0x40000000);
volatile byte *MMCControl = (byte *) (0x40000001);
volatile byte *Buttons = (byte *) (0x40000004);
volatile byte *ButtonsControl = (byte *) (0x40000005);
volatile byte *MP3Port = (byte *) (0x40000006);
volatile byte *MP3Control = (byte *) (0x40000007);
volatile byte *MP3Data = (byte *) (0x40000004);

const byte LCD_LINE_ADR[LCD_LINES] = {0x00, 0x40, 0x14, 0x54};


struct BootRecord {
	byte 	JumpCommand[3];
	char 	OEMName[8];
	int 	BytesPerSector;
	int 	SectorsPerCluster;
	int 	ReservedSectors;
	int 	NumberOfFATs;
	int 	NumberOfRootEntries;
	int 	NumberOfMediaSectors;
	byte	Media;
	int 	SectorsPerFAT;
	int 	SectorsPerTrack;
	int 	NumberOfHeads;
	int 	NumberOfHiddenSectors;
	int 	NumberOfTotalSectors;
	byte	DriveNumber;
	byte	Reserved;
	byte	ExtendedSignature;
	byte	VolumeID[4];
	char	VolumeLabel[11];
	char	FileSystem[8];
	//		Don't need Program Code. Waste of memory;
	byte	Signature1;
	byte	Signature2;
};

struct FileRecord {
	char 	FileName[FILENAME_RECORDS * FN_RECORD_LENGTH + 1];
	int 	FirstCluster;
	int 	Played;
};


void initboard(void);
void initlcd(void);
void initmp3(void);
void initmmc(void);
void readboot(void);
void readfilenames(void);
void welcome(void);
void userinterface(void);
int getnextcluster(int thiscluster);
int play(int song);
void mp3write(byte data);
int randomsong(unsigned int seed, int repeat);
int mod(int op1, int op2);
void sendcmd(byte command, unsigned int argument, byte crc);
void displaysongs(int topsong);
void displaycursor(int line);
void cls(void);
void lcdwritemsg(char *msg, int line, int charoffset);
void lcdwrite(byte data, enum LCDRegSel RS);
void waitfor(enum MMCResp resp);
void readslack(int numbytes);
int readnumber(int numbytes);

extern byte mmcrw(byte writebyte);
extern void lcdwait(void);
extern void lcdwritedata(byte data);
extern void lcdwritectrl(byte data);
extern void delay(int cycles);