yampp7_usb.c

DIY自己的MP3的参考价值极高的代码。含有详细的解释

/* ***********************************************************************
**
**  Copyright (C) 2002  Jesper Hansen <[e-mail]> and 
**			Romuald Bialy (MIS) <[e-mail]>.
**
**
**  Yampp-7/USB - main file
**
**  File yampp7_usb.c
**
*************************************************************************
**
**   This file is part of the yampp system.
**
**  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; either version 2
**  of the License, or (at your option) any later version.
**
**  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.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software Foundation, 
**  Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
**
*************************************************************************
**
**  Revision History
**
**  when         what  who	why
**
**  2002-09-13   0.9   Jesper   
				-initial test release
**  2002-09-22   1.0   MIS	
				-change automatic power off time to 2 minutes (in stop mode)
				-added card present checking, if no card present or card removed - go to sleep mode
				-added LED output on PB0
				-changed wakeup from sleep - now we must press and hold "Play" key for two seconds
				-added some beeps and blinks
				-added beep during playlist change. Playlist <TOTAL> have different tone from other.
				-added little delay in keypress checking for avoid accidental key pressing.
				-added FastForward, Random, Loudness and Repeat functions.
				-all functions is handled by 4 keys, layout is depending on playing state. 
				-added trap for vs1001 lockup if MP3 has garbage
				-added manual power off -> longpress STOP key in Stop mode.
				-added auto power of from pause state after 30 minutes
				-added battery level monitoring.
				-added battery charge indicator. See README.TXT for details.
**  2002-09-25   1.10  MIS	
				-added true random function (max 1024 songs in playlist)
**  2002-10-04   1.11  MIS	
				-added card removing checking during pause and stop mode
				-code speed-up and cleaning
				-added configurable CF standby time (in Constants.h)
**  2002-10-07   1.12  MIS	
				-added keyboard locking functions with autolock. See README.TXT for details.
**  2002-10-09   1.13  MIS	
				-fixed accidentally bootloader entering during keyboard locking
				-fixed accidentally change song after keyboard unlocking
				-added beep for manual lock/unlock confirmation (may be off in Constants.h)
				-added autolock turn ON/OFF while normal operation (if enabled)
**  2002-10-14   1.20  MIS	
				-beta version, added suport for Nokia LCD (not public)
**  2002-10-18 to1.45  MIS	
				-most bugfix (not public)
**  2002-10-20   2.00  MIS	
				-Public beta version of y7 firmware with LCD support.
**  2002-10-21   2.10  MIS	
				-added total song time displaying.
				-minior bugfix.
**  2002-10-23   2.11  MIS	
				-some improvements and bugfixes in displaying functions
				-bugfix in next playlist change. Stack overvriting generate this problem.
				-little change in keylock icons
**  2002-10-29   2.12  MIS	
				-eeprom is written only before power-off or USB connect, for extend eeprom life.
				-added suport for card-specific graphical logo.
				-bugfix in battery charge indication during stop.
				-bugfix in artist name displaying if name is short.
				-bugfix in fast forward volume decrease.
**  2002-10-30   2.13  MIS	
				-added support for national characters displaying
**  2002-11-02   2.14  MIS	
				-added support for vs1001 equalizer
				-some memory usage fixes 
**  2002-11-05   2.15  MIS	-changed scroll routines
**  2002-11-23   2.16  MIS	-fixed card removing checking
				-fixed "MENU" text length
				-fixed battery level monitoring
				-fixed randomizer
				-alternate scroll is back
**  2002-12-18   2.17  MIS	
				-added remain song time displaying
**  2003-01-13   2.18  MIS    	
				-added compatibility with new versions of GCC
				-some menu functionality extensions
				-removed uart calls
				-removed not used beep calls
				-some code optimisations
**  2003-02-23   2.20  MIS   	
				-added MMC card support
				-added support for new version of VS1001 equalizer library with 12 presets
				-changes in ATA library
				-many code optimisations
				-fixed contrast setting

**  2003-03-18	2.21 jesper
				- modifications for new Rev. D board.
				- charge input changed to PE1 instead of PE2
				- expanded contrast range

**  2003-03-19	2.22   MIS	-small fixes in jesper modifications
				-bugfix in processing garbaged song
				-support for any old and a new Rev D board (see Constants.h)

**  2003-05-18	2.23   MIS	-added balance control
				-enabled playlist change during STOP state
				-added info about backlight mode
				-code size optimization
				-some bugfix in visualisation, charging control ect.

**  2003-07-14	2.25b1   MIS	-Sources changed for compilation with AVR-GCC 3.3 !!!
				-added new optional "PREVOUS" key functionality (work like in normal CD players).
				-fixed problems with some large CF cards
				-fixed problems with yamppLink conect/disconnect on MMC cards.
				-fixed Pause Mode

**  2003-08-08	2.25b2  nilrog	-fixed playlists handling by changing the "get_offset_entry" function.
			MIS	-adding way to fix the CF card reset after card inserting problem solving.

**  2004-01-18	2.28    MIS	-added support for native mode of AtMega162 with crystal about 6-14MHz.
				 This cause speed up file transfer to about 400kb/s (at 14.318Mhz)
				-removed not used Uart and Base libraries code and not used part in usb.c file.
				-added confirmation before card formatting.
				-fixed low battery checking
				-fixed startup without card
				-speedup MMC card write

**  2004-02-05	3.00    MIS	-Test version for COLOR LCD
				-added 6 backlight modes with dimmer in M162 mode
				-fixed VS1001 hardware reset if VS not respond

**  2004-02-14	3.01    MIS	-fixed player crash after several changes of playlist.
				-some changes in audio data loading procedures

**  2004-02-15	3.02    MIS	-Changed all inp() and outp() macros to standard PORT = value.
				-Increased ContWrites value to 256.
				-Changed contrast setting image to number 5 and temoved text.
				-Changed randomizer function
				-Added display layout and colors configuration

**  2004-03-20	3.03    MIS	-Some bugfixes.
**  2004-04-09	3.04    MIS	-Speed-up the CPU, because it have problems with Bitrate > 160 and with VBR
				-Removed unused MS_BASS register writing

**  2004-04-11	3.10    MIS	-All strings moved to "lcd_layout.h" file for easy translation to other language
				-Fixed "Browse list" function.

**  2004-05-20	3.11    MIS	-Fixed MMC cards support.

**  2004-10-08	3.12    Nilrog	-fixed repeat one song function, thank's to Roger Nilson
			MIS	-fixed MMC size and name detection
				-fixed standby high current consumption with some MMC cards


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

#include "yampp7_usb.h"
#include "lcd_layout.h"
 
#define YAMPP_FIRMWARE_VERSION_MAJOR	3
#define YAMPP_FIRMWARE_VERSION_MINOR	12

#define DISK_LAYOUT_VERSION_MAJOR	1
#define DISK_LAYOUT_VERSION_MINOR	0


// The CPU is running with a 4.0 MHz (M161 CPU) or 4-15MHz (M162 CPU) clock

char firmware_scan_tag[] __attribute__ ((progmem)) = "yfwTAG";
char model_txt[]         __attribute__ ((progmem)) = "yampp-7";
char date_txt[]          __attribute__ ((progmem)) = __DATE__" / "__TIME__;
char version_txt[]       __attribute__ ((progmem)) = "3.12";

//------------------------------------------------------------------------------------------

extern u08 card_sbuf[512];

//------------------------------------------------------------------------------------------

void idle(void);
void next_song(u08 mode);
void feed_audio_data(void);
u08 IsCharging(void);
void set_cpu_speed(u08 speed);

event_e menu_event;

u08 isPlaying;				// Playing status
u08 bLoudness;				// Loudness modificator
u08 bRandom;				// Random modificator
u08 Repeat;				// Repeat mode modificator
u08 keylock;				// Keylock status
u08 autolock;				// Autolock ON/OFF
u08 lobatt;				// Battery status
u08 timemode;				// Remain time modificator
u08 light_mode;				// LCD backlight mode

u08 volume;				// Volume level
s08 balance;				// Balance
u08 vol_decrease;			// Modificator for fast forward function
u16 ClusterCount;			// Counter for Fast Forward calculations
u16 addtime;				// for Fast Forward time calculation
u16 curPlaylist;			// Current playlist number
u16 curIndex;				// Current song number inside playlist
u32 filesize;				// size of file to play (divided by 32)
u32 fileplayed;				// amount of played data (divided by 32)
u16 bitrate;				// song bitrate for fast forward time calculation
u16 songtime;

u08 time_flag;				// general time counter
u08 scroll_flag;			// scrolling flag
u08 info_flag;
u08 light_time;				// LCD backlight time
u16 sleepcount;				// counter for automatic power off
u16 lobatt_time;			// counter for low battery checking
u16 keylock_time;			// automatic keylock timer

u32 lcd_data_start;			// start sector of datas for LCD

u16 vs1001_fw;				// Pointer into vs1001 additional firmware pointer
u08 *outptr;				// pointer for sending data to vs1001
u08 ARTISTNAME_BUF[48];			// buffer for artist name scrolling
u08 SONGNAME_BUF[55];			// buffer for title name scrolling
u08 *artistname = (u08*)ARTISTNAME_BUF;	// pointer to artistname buffer
u08 *titlename = (u08*)SONGNAME_BUF;	// pointer to songname buffer
u08 scroll_length;			// size of scroll data
u08 scroll_length_2;			// size of scroll data 2
u08 scroll_pos;				// current position in scroll string
u08 scroll_pos_2;			// current position in scroll string 2
#ifdef ALTERNATE_SCROLL
 u08 scroll_dir, scroll_dir_2;
#endif

u32 MyCluster;				// current cluster number
u32 MySector = 2;			// current sector number
u16 SectorsLd;				// sectors in cluster counter
u08 colors[40];				// objects colors table

u08 *function_name[] __attribute__ ((progmem)) = {
(u08*)&fn0,(u08*)&fn1,(u08*)&fn2,(u08*)&fn3,(u08*)&fn4,(u08*)&fn5,(u08*)&fn6,(u08*)&fn7,(u08*)&fn8,(u08*)&fn9,(u08*)&fn10};

//---------------------------------------------------------------------------

u08 CARD_SW_Reset2(void)					// ATA Reset
{
#ifdef MMC_CARD
	u08 retry = 3;						// retry counter

	while(--retry)
	{
		if(MMC_Reset())
			return 1;
	}
	return 0;

#else
	u16 timeout = 5000;					// timeout = 500ms

	WriteBYTE(ATAPI_DevCtrl, 0x06);				// SRST and nIEN bits
	delay10();						// 10uS delay
	WriteBYTE(ATAPI_DevCtrl, 0x02);				// nIEN bit
	delay10();						// 10 uS delay
	while ((ATA_ReadStat() & 0xC0) != SR_DRDY)		// Wait for DRDY and !BUSY
	{
		if (--timeout == 0)				// Timeout check
			return (0);				// Return with ERROR
		delay100();					// 100 uS delay
	}
  	if (ReadBYTE(ATA_Sector) != 1)				// Checking for RESET signature
		return (0);					// Return with ERROR

	return 1;
#endif

}
//----------------------------------------------------------------------------

#define EVENT_QUEUE_SIZE	4
volatile event_e event_queue[EVENT_QUEUE_SIZE];
volatile u08 event_queue_head = 0;
volatile u08 event_queue_tail = 0;

void set_event(event_e e)
{
	event_queue[event_queue_head] = e;
	event_queue_head = (event_queue_head + 1) % EVENT_QUEUE_SIZE; 
}

event_e check_event(void)
{
	event_e tmp = EV_IDLE;
	
	//
	// check queue
	//
	if (event_queue_head != event_queue_tail)
	{
		tmp = event_queue[event_queue_tail];
		event_queue_tail = (event_queue_tail + 1) % EVENT_QUEUE_SIZE; 
	}
	return tmp;
}

event_e get_event(void)
{
	//
	// let the system have it's time
	//
	idle();
	return check_event();
}


//--------------------------------------------------------------------------
// States for	M162 mode	M161 mode
//
//    0  	Always OFF	Always OFF
//    1 	OFF/DIM		OFF/ON
//    2		OFF/ON		Always ON
//    3		Always DIM	not allowed
//    4		DIM/ON		not allowed
//    5		Always ON	not allowed


void backlight_off(void)
{
#if defined (__AVR_ATmega162__)

	if(light_mode < 3)			// OFF state
		OCR0 = 0;

	else if(light_mode < 5)
		OCR0 = BL_DIMMLEVEL;

#else

	if(light_mode < 2)
		cbi(PORTB,LED_PIN);		// OFF state

#endif
}

void backlight_on(void)
{
	light_time = BACKLIGHT_TIME;
#if defined (__AVR_ATmega162__)

	if(light_mode > 3 || light_mode == 2)
		OCR0 = 0xff;			// ON state
	else if(light_mode != 0)
		OCR0 = BL_DIMMLEVEL;		// DIMM state

#else

	if(light_mode != 0)
		sbi(PORTB,LED_PIN);		// ON state

#endif
}

//--------------------------------------------------------------------------

//
// External INT2 (Play key)
//

SIGNAL(SIG_INTERRUPT2)				// Need this for wake up from sleep
{
	asm volatile ("nop");
}


//--------------------------------------------------------------------------


SIGNAL(SIG_OVERFLOW1)				// timer 1 overflow every 100 mS
{
	TCNT1 = (u16)-(F_CPU / 2560);
	time_flag++;				// general time counter
	scroll_flag++;
	nKeyTime++;				// counter for keyboard
	lobatt_time++;				// counter for low battery routine
	sleepcount++;				// sleep counter

	if (light_time)
	{
		if (--light_time == 0)
		{
			asm volatile ("call backlight_off");
//			backlight_off();
		}
	}

	if (isPlaying && keylock==0 && autolock)
	{
		if (keylock_time <= AUTOLOCK_TIME)
			keylock_time++;
		else
			keylock = 1;
	}
}

//--------------------------------------------------------------------------

void LoudSet(void)
{
	if (vs1001_fw)
	{
		if(bLoudness)
		{
			vs1001_write(0x0A,vs1001_fw);
			vs1001_write(0x0D,0);
			vs1001_write(0x0D,bLoudness);
		}
		else
		{
			vs1001_write(0x0D,0);
			vs1001_write(0x0A,0);
		}
	}
	else
		vs1001_write(VS1001_MODE, 0x0080 * (bLoudness != 0));	// write bit SM_BASS to VS1001K

	vs1001_setvolume(volume,balance);
}

//--------------------------------------------------------------------------

static u08 buf[] __attribute__ ((progmem)) = {0x53, 0xEF, 0x6E, 0x45, 0x78, 0x69, 0x74};

void beep(u08 freq, u16 time)
{
	u08 i;
	vs1001_write(0x0D,0);
	vs1001_write(0x0A,0);
	if (isPlaying)
	{
		addtime += vs1001_read(VS1001_PLAYTIME);
		vs1001_reset();
	}
	vs1001_setvolume(volume+24,balance);		// -12dB
	vs1001_nulls(8);
	for (i=0;i<3;i++)				// beep on
		vs1001_send_data(PRG_RDB(&buf[i]));
	vs1001_send_data(freq);
	vs1001_nulls(4);

	delayms(time);

	for (i=3;i<7;i++)				// sine OFF
		vs1001_send_data(PRG_RDB(&buf[i]));
	vs1001_nulls(4);
	LoudSet();					// restore Loudness settings and Volume
}
//--------------------------------------------------------------------------

void send_sinewave_beeps(void)
{
	u08 j = 3;
	
	delayms(100);
	while (j--)
	{
		beep(SINE_1000,100);
		delayms(100);
	}
}

//--------------------------------------------------------------------------

void pump_audio(void)
{
	if(isPlaying)
	{
		while(CARD_Read(MySector))
		    	CARD_SW_Reset2();
		feed_audio_data();
	}
	else
		set_cpu_speed(CLKDIV);				// CPU clock = XTAL / M162CLKDIV

}