yampp2.c

Procyon方案(手工制作的MP3播放器电路及资料)

/*
  Copyright (C) 2000 Jesper Hansen <[e-mail]>.

  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.
*/


/*

	Power requirements
		CPU	(@4MHz)			4/8 mA	(3.3V/5V)
	SRAM				90 mA (active, 20 mA stby)
	DAC					5/8 mA	(3.3V/5V)
	MAS					55 mA
	Other				10 mA
						------
	Total				150-170 mA

	Disk				450-500 mA
	
	Grand finale		600-700 mA				


	Measurements show about 200-250 mA standby (no disk powerdown), and
	about 470 mA playing.
	
*/



/*
	PIN assignements on test board
	
	PA0-PA7		data bus 0..7 + Address 0..7
	PC0-=C7		address 8..15	
	
	PB0		T0		DIOW
	PB1		T1		DIOR
	PB2		AIN0	DEMAND
	PB3		AIN1	I2CD		
	PB4		SS		I2CC
	PB5		MOSI	SID
	PB6		MISO 	(not available)
	PB7		SCK		SIC
	

	PD0		RxD		RS-232
	PD1		TxD		RS-232
	PD2		INT0	IR_INPUT
	PD3		INT1	KEY_INPUT
	PD4		T0		free
	PD5		T1		LCD_E
	PD6		WR		RD
	PD7		RD		WR	


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

	MAS DEMAND PIN @ 8 MHz
	
	 	 ___				____
	____|	|______________|	|____________

		1.5 mS     11 mS

	SIC frequency = 2 MHz  ( Prescaler = fClk/4 )

	About 3 kBits are sent in each burst

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
*/


#include <io.h>
#include <progmem.h>
#include <eeprom.h>
#include <signal.h>
#include <interrupt.h>

#include "uart.h"
#include "lcd.h"
#include "ata_if.h"
#include "delay.h"
#include "spi.h"
#include "i2c.h"
#include "fat.h"
#include "mas.h"
#include "dac.h"
#include "mem.h"

#include "rec80.h"



// eeprom positions
#define EEPROM_VOLUME	0x0010
#define EEPROM_AUTOPLAY	0x0011
#define EEPROM_SONGPOS	0x0012



//#define HEXDUMP 1
//#define MAS_INFO 1



#ifdef HEXDUMP

extern unsigned char *SectorBuffer;

void HexDump( unsigned char *buffer, int len ) 
{
    int i,j,k = 0;

    EOL();
    for(i=0;i<len/16;i++,k+=16)
    {
        UART_Printfu16(k);	
        UART_SendByte(' ');
        for(j=0;j<16;j++)
        {
            UART_Printfu08(buffer[i*16+j]);	
            UART_SendByte(' ');
        }
        PRINT("    ");
        for(j=0;j<16;j++)
        {
            if (buffer[i*16+j] >= 0x20)
                UART_SendByte(buffer[i*16+j]);
            else
                UART_SendByte('.');
        }
        EOL();
    }

}

void sectordump(unsigned long sector)
{
	ATA_Read_Sectors_LBA(DRIVE0,sector,1,SectorBuffer);
	UART_Printfu32(sector);
	HexDump(SectorBuffer, 512);
}

#endif


unsigned int scroll_length;
unsigned int scroll_pos = 0;
unsigned char scroll_flag = 0;
char * scroll_line  = (unsigned char *) SCROLL_LINE;
	


unsigned char * outptr;

unsigned char *buffer1;
unsigned char *buffer2;
unsigned char *buffer3;
unsigned char *buffer4;


unsigned char *i2cdata = (unsigned char *) I2CDATA;

unsigned long mycluster;


extern unsigned int  Sectors_Per_Cluster;

unsigned long lbasector = 0;
unsigned long temp;
unsigned char *updbuf;


typedef enum
{
	PS_STOPPED,
	PS_PLAYING,
	PS_PAUSED
} playstate_e;

playstate_e isPlaying = PS_STOPPED;


typedef enum
{	
	EV_IDLE,
	EV_PLAY,
	EV_STOP,
	EV_NEXT,
	EV_PREV,
	EV_VOLUP,
	EV_VOLDN,
	EV_NEUTRAL,
	EV_MUTE,
	EV_LASTEVENT	
} event_e;	



// 100 mS @ prescaler 4 (f/256)  (32 uS)
// - 3125
//#define TI1_H	0xf3
//#define TI1_L	0xcb


// 500 mS @ prescaler 5 (f/1024) (128 uS)
// - 3906
#define TI1_H	0xf0
#define TI1_L	0xbe

// 1000 mS @ prescaler 4 (f/256)  (32 uS)
// - 31250
//#define TI1_H	0x85
//#define TI1_L	0xee


volatile unsigned char time_flag = 0;
volatile char time[7];
volatile int time_now;


SIGNAL(SIG_OVERFLOW1)	//timer 1 overflow every 500 mS
{
	time_flag++;

	outp(TI1_H, TCNT1H);					//reload timer 
	outp(TI1_L, TCNT1L);

	if (isPlaying != PS_PLAYING)
		return;
		
	time_now++;
}


//
// Get a character event from the RS-232 port
//
event_e get_char_event(void)
{
	unsigned char c;
	
	switch ((c = UART_ReceiveByte())) 
    {
//				case 'r' : ATA_SW_Reset(); break;

#ifdef HEXDUMP
		case '0' : case '1' : case '2' : case '3' : case '4' : 				
		case '5' : case '6' : case '7' : case '8' : case '9' :
			temp = temp*10 + c-'0';
			break;
			
		case 0x0d :
			lbasector = temp;
			temp = 0;
			break;

		case '+':
			sectordump(++lbasector);
			break;	      		
		case '-':
			sectordump(--lbasector);
			break;	      		
#endif
		
/*		      	case 'R': 	
      		ShowRegisters(DRIVE0); 
      		break;
*/

		case 'V' : return EV_VOLUP;
		case 'v' : return EV_VOLDN;
		case 'N' : return EV_NEUTRAL;
		case 'm' : return EV_MUTE;

		case 'p' : return EV_PREV;
		case 'n' : return EV_NEXT;
		case 'g' : return EV_PLAY;
		case 'G' : return EV_STOP;
		default:   return EV_IDLE;
    }
}

/* 	uncomment if you want to use IR
	also uncomment code in REC-80
	
event_e ir_event(void)
{
	switch (get_rec80())
	{
		default:
		case 0: return EV_IDLE;
		case IR_PLAY: return EV_PLAY;
		case IR_STOP: return EV_STOP;
		case IR_PREV: return EV_PREV;
		case IR_NEXT: return EV_NEXT;
		case IR_VOLUP: return EV_VOLUP;
		case IR_VOLDN: return EV_VOLDN;
	}
}

*/

//
// get a keyboard event
//
event_e get_key_event(void)
{
	static unsigned char keydown = 0;
	unsigned char i;
	event_e event = EV_IDLE;

	cbi(MCUCR, SRE);		// disable EXTRAM
	outp(0xff, PORTA-1);	// set port as output
	outp(0, PORTA);			// set all pins to 0
	asm volatile("nop");	// allow time for port to activate

	if (keydown)	// if a key was pressed earlier
	{
		// see if it has been released
		if (bit_is_set(PIND,PD3))	// check bit
		{
			// no key is down
			// return last key seen
			switch (keydown)
			{
				case 1 : event = EV_NEUTRAL; break;
				case 2 : event = EV_PLAY; break;
				case 3 : event = EV_PREV; break;
				case 4 : event = EV_NEXT; break;
			}
			keydown = 0;
		}
	}
	else
	{	
		if (bit_is_clear(PIND,PD3))	// check if a key is down
		{
			// a key is active, check which one
			for (i=0;i<8;i++)
			{
				outp(~(1<<i), PORTA);		// write bit mask
				asm volatile("nop");		// wait a while
				if (bit_is_clear(PIND,PD3))	// this bit ?
				{
					keydown = i+1;		// store the key
					break;				// and exit
				}
			}
		}
	}
	sbi(MCUCR, SRE);	// enable RAM
	return event;
}





#ifdef MAS_INFO
//
// print some MAS identification strings e.t.c.
//
void mas_info(void)
{
    // request some MAS chip info
    i2c_send(0x3a,0x68, 6, "\xf0\x00\x00\x0a\x0f\xf6");		// ???
    delay(1000);
    i2c_receive(0x3a,0x69, 40, i2cdata );
	
    EOL();

    a1  = (ULONG) i2cdata[3] << 16;
    a1 += (ULONG) i2cdata[0] << 8;
    a1 += (ULONG) i2cdata[1];

    PRINT("MAS Version: ");
    UART_Printfu32(a1);
    EOL();

    a1  = (ULONG) i2cdata[7] << 16;
    a1 += (ULONG) i2cdata[4] << 8;
    a1 += (ULONG) i2cdata[5];

    PRINT("Design code: ");
    UART_Printfu32(a1);
    EOL();