test._c

是一款开发板的外围电路试验程序(附有原理图)

//ICC-AVR application builder : 2007-8-2 13:09:26
// Target : M16
// Crystal: 8.0000Mhz

#include <iom16v.h>
#include <macros.h>

unsigned char  data = 0x1;
void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

//TIMER1 initialize - prescale:64
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 200mSec
// actual value: 200.000mSec (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0xeE; //setup
 TCNT1L = 0x58;
 OCR1AH = 0x61;
 OCR1AL = 0xA8;
 OCR1BH = 0x61;
 OCR1BL = 0xA8;
 ICR1H  = 0x61;
 ICR1L  = 0xA8;
 TCCR1A = 0x00;
 TCCR1B = 0x03; //start Timer
}

#pragma interrupt_handler timer1_ovf_isr:9
void timer1_ovf_isr(void)
{
 //TIMER1 has overflowed
 TCNT1H = 0xef; //reload counter high value
 TCNT1L = 0x58; //reload counter low value
 if(data == 0x01)
  data = 0;
 else
  data = 1;
  PORTB = data;
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer1_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x04; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

//
void main(void)
{
 init_devices();
 //insert your functional code here...
}