// Copyright 2006 Yamane Akira
//ICC-AVR application builder : 2005/09/06 22:33:17
// Target : M48
// Crystal: 8.0000Mhz

#include <iom48v.h>
#include <macros.h>

unsigned char vl,vh,j,ch_bit;

void port_init(void)
{
 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0x00; 
 DDRC  = 0x00;
 PORTD = 0xFF;
 DDRD  = 0xFF;
}

//TIMER0 initialize - prescale:64
// WGM: CTC
// desired value: 500uSec
// actual value: 496.000uSec (0.8%)
void timer0_init(void)
{
 TCCR0B = 0x00; //stop
 TCNT0 = 0xFF; //set count
 TCCR0A = 0x02; 
 OCR0A = 0x3E;   // 
 TCCR0B = 0x03; //start timer
}

#pragma interrupt_handler timer0_compa_isr:15
void timer0_compa_isr(void)
{
  ch_bit = !ch_bit;
  ADMUX = 0x40 | (ch_bit && 0x01);
  j++;
}

//ADC initialize
// Conversion time: 104uS
void adc_init(void)
{
 ADCSRA = 0x00; //disable adc
 ADMUX = 0x40;  //select adc input 0 right adjust
 ACSR  = 0x80;
 ADCSRB = 0x03;
 DIDR0=0x01;
 ADCSRA = 0xAE;  

}
#pragma interrupt_handler adc_isr:22
void adc_isr(void)
{
  vl=ADCL;            //Read 8 low bits first (important)
  vh=ADCH;    //read 82high bits
  PORTB = vl;
  PORTD = vh | (ch_bit << 4);
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer0_init();
 adc_init();

 MCUCR = 0x00;
 EICRA = 0x00; //extended ext ints
 EIMSK = 0x00;
 
 TIMSK0 = 0x02; //timer 0 interrupt sources <----
 TIMSK1 = 0x00; //timer 1 interrupt sources
 TIMSK2 = 0x00; //timer 2 interrupt sources
 
 PCMSK0 = 0x00; //pin change mask 0 
 PCMSK1 = 0x00; //pin change mask 1 
 PCMSK2 = 0x00; //pin change mask 2
 PCICR = 0x00; //pin change enable 
 PRR = 0x00; //power controller
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

//
void main(void)
{
 init_devices();
  ch_bit=0x01;
  j=0;
  while(1)
   ;
}