// Copyright 2006 Yamane Akira
//ICC-AVR application builder : 2005/08
// Target : M48
// Int RC Osc: 8.0000Mhz
// ADC Sample Program 1: Single Conversion mode
// Programmed by A. Yamane

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

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

//TIMER0 initialize - prescale:1024
// WGM: Normal
// desired value: 20mSec
// actual value: 19.968mSec (0.2%)
void timer0_init(void)
{
 TCCR0B = 0x00; //stop
 TCNT0 = 0x64; //set count
 TCCR0A = 0x00; 
 TCCR0B = 0x05; //start timer
}

#pragma interrupt_handler timer0_ovf_isr:17
void timer0_ovf_isr(void)
{
 TCNT0 = 0x64; //set count
 ADCSRA = 0xCF; //
 PORTB=0x01;
}

//ADC initialize
// Conversion time: 208uS
void adc_init(void)
{
 ADCSRA = 0x00; //disable adc
 ADMUX = 0x60;  //select adc input 0
 ACSR  = 0x80;  // Analolg Comp Disabled
 DIDR0 = 0x01;  // PIN0 Digital Input Disable
 ADCSRB = 0x00; // Auto Triger None 
}

#pragma interrupt_handler adc_isr:22
void adc_isr(void)
{
 unsigned char vh,vl;
  vl=ADCL;    //Read 2 low bits first (important)
  vh=ADCH;    //read 8 high bits 
  PORTB = 0x00;
  PORTD = ~vh;
}

//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 = 0x01; //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
}

//
void main(void)
{
 init_devices();
  PORTD=0xFF;
  while(1)
   ;
}