//ICC-AVR application builder : 2008-3-25 0:28:31
// Target : M128
// Crystal: 11.059Mhz
#include <iom128v.h>
#include <macros.h>
void port_init(void)
{
PORTA = 0xFF;
DDRA = 0x00;
PORTB = 0xEF;
DDRB = 0x10;
PORTC = 0xFF; //m103 output only
DDRC = 0x00;
PORTD = 0xFF;
DDRD = 0x00;
PORTE = 0xFF;
DDRE = 0x00;
PORTF = 0xFF;
DDRF = 0x00;
PORTG = 0x1F;
DDRG = 0x00;
}
//TIMER0 initialisation - prescale:1
// WGM: CTC
// desired value: 2MHz
// actual value: 1.843MHz (-8.5%)
void timer0_init(void)
{
TCCR0 = 0x00; //stop
ASSR = 0x00; //set async mode
TCNT0 = 0xFB; //set count
OCR0 = 0x05;
TCCR0 = 0x19; //start timer
}
#pragma interrupt_handler timer0_comp_isr:16
void timer0_comp_isr(void)
{
//compare occured TCNT0=OCR0
}
#pragma interrupt_handler timer0_ovf_isr:17
void timer0_ovf_isr(void)
{
TCNT0 = 0xFB; //reload counter value
}
//call this routine to initialise all peripherals
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
XDIV = 0x00; //xtal divider
XMCRA = 0x00; //external memory
port_init();
timer0_init();
MCUCR = 0x00;
EICRA = 0x00; //extended ext ints
EICRB = 0x00; //extended ext ints
EIMSK = 0x00;
TIMSK = 0x03; //timer interrupt sources
ETIMSK = 0x00; //extended timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialised
}
void main(void)
{
init_devices();
while(1)
;
}
