void Initialize(void){
int i;
if(!isEepromFormatted()) FormatEeprom();
cli();
//InitSoundPort(); //ramp-up sound to avoid click
#if SOUND_MIXER == MIXER_TYPE_VSYNC
//Initialize the mixer buffer
//ramp up to avoid initial click
for(int j=0;j<MIX_BANK_SIZE*2;j++){
mix_buf[j]=0x80;//(i<128?i:128);
}
mix_pos=mix_buf;
mix_bank=0;
#endif
#if MIXER_CHAN4_TYPE == 0
//initialize LFSR
tr4_barrel_lo=1;
tr4_barrel_hi=1;
tr4_params=0b00000001; //15 bits no divider (1)
#endif
#if UART_RX_BUFFER == 1
uart_rx_buf_start=0;
uart_rx_buf_end=0;
#endif
#if SNES_MOUSE == 1
snesMouseEnabled=false;
#endif
//silence all sound channels
for(i=0;i<CHANNELS;i++){
mixer.channels.all[i].volume=0;
}
//set sync parameters. starts at odd field, in pre-eq pulses, line 1, vsync flag cleared
sync_phase=0;
sync_flags=0;
sync_pulse=SYNC_PRE_EQ_PULSES+SYNC_EQ_PULSES+SYNC_POST_EQ_PULSES;
//set rendering parameters
render_lines_count_tmp=FRAME_LINES;
render_lines_count=FRAME_LINES;
first_render_line_tmp=FIRST_RENDER_LINE;
first_render_line=FIRST_RENDER_LINE;
joypad1_status_hi=0;
joypad2_status_hi=0;
sound_enabled=1;
InitializeVideoMode();
//Initialize I/O registers
u16 val;
u8 *ptr;
for(u8 j=0;j<(sizeof(io_table)>>1);j++){
val=pgm_read_word(&io_table[j]);
ptr=(u8*)(val&0xff);
*ptr=val>>8;
}
sei();
DisplayLogo();
}
void Initialize(void){
int i;
if(!isEepromFormatted()) FormatEeprom();
cli();
//Initialize the mixer buffer
for(i=0;i<MIX_BANK_SIZE*2;i++){
mix_buf[i]=0x80;
}
mix_pos=mix_buf;
mix_bank=0;
for(i=0;i<CHANNELS;i++){
mixer.channels.all[i].volume=0;
}
#if MIXER_CHAN4_TYPE == 0
//initialize LFSR
tr4_barrel_lo=1;
tr4_barrel_hi=1;
tr4_params=0b00000001; //15 bits no divider (1)
#endif
#if UART_RX_BUFFER == 1
uart_rx_buf_start=0;
uart_rx_buf_end=0;
#endif
#if MIDI_IN == 1
UCSR0B=(1<<RXEN0); //set UART for MIDI in
UCSR0C=(1<<UCSZ01)+(1<<UCSZ00);
UBRR0L=56; //31250 bauds (.5% error)
#endif
//stop timers
TCCR1B=0;
TCCR0B=0;
//set ports
DDRC=0xff; //video dac
DDRB=0xff; //h-sync for ad725
DDRD=(1<<PD7)+(1<<PD4); //audio-out + led
PORTD|=(1<<PD4)+(1<<PD3)+(1<<PD2); //turn on led & activate pull-ups for soft-power switches
//setup port A for joypads
DDRA =0b00001100; //set only control lines as outputs
PORTA=0b11111011; //activate pullups on the data lines
//PORTD=0;
//set sync parameters. starts at odd field, in pre-eq pulses, line 1
sync_phase=SYNC_PHASE_PRE_EQ;
sync_pulse=SYNC_PRE_EQ_PULSES;
//set rendering parameters
render_lines_count_tmp=FRAME_LINES;
first_render_line_tmp=FIRST_RENDER_LINE;
//clear timers
TCNT1H=0;
TCNT1L=0;
//set sync generator counter on TIMER1
OCR1AH=HDRIVE_CL_TWICE>>8;
OCR1AL=HDRIVE_CL_TWICE&0xff;
TCCR1B=(1<<WGM12)+(1<<CS10);//CTC mode, use OCR1A for match
TIMSK1=(1<<OCIE1A); //generate interrupt on match
//set clock divider counter for AD725 on TIMER0
//outputs 14.31818Mhz (4FSC)
TCCR0A=(1<<COM0A0)+(1<<WGM01); //toggle on compare match + CTC
OCR0A=0; //divide main clock by 2
TCCR0B=(1<<CS00); //enable timer, no pre-scaler
//set sound PWM on TIMER2
TCCR2A=(1<<COM2A1)+(1<<WGM21)+(1<<WGM20); //Fast PWM
OCR2A=0; //duty cycle (amplitude)
TCCR2B=(1<<CS20); //enable timer, no pre-scaler
SYNC_PORT=(1<<SYNC_PIN)|(1<<VIDEOCE_PIN); //set sync & chip enable line to hi
burstOffset=0;
curr_frame=0;
vsync_phase=0;
joypad1_status_hi=0;
joypad2_status_hi=0;
snesMouseEnabled=false;
sound_enabled=1;
//enable color correction
ReadButtons();
if(ReadJoypad(0)&BTN_B){
SetColorBurstOffset(4);
}
InitializeVideoMode();
sei();
DisplayLogo();
}
