led.c

avr单片机

//ICC-AVR application builder : 2006-5-22 9:26:54
// Target : M128
// Crystal: 16.000Mhz

#include <iom128v.h>
#include <macros.h>
#include <d:\excersize\led.h>
void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0x00; //m103 output only
 DDRC  = 0xFF;
 PORTD = 0xFF;
 DDRD  = 0xF0;
 PORTE = 0x00;
 DDRE  = 0x00;
 PORTF = 0x00;
 DDRF  = 0x00;
 PORTG = 0x00;
 DDRG  = 0x00;
}
void watchdog_init(void)
{
 WDR(); //this prevents a timout on enabling//
 WDTCR = 0x0F; //WATCHDOG ENABLED - dont forget to issue WDRs
}
void timer0_init(void){
 TCCR0 = 0x00; //stop
 ASSR  = 0x00; //set async mode//同步方式，允许更新计数，比较输出，控制寄存器
 TCNT0 = 0x83; //set count
 OCR0  = 0x7D;
 TCCR0 = 0x05; //start timer//128分频
}
//======================================================time0 中断
#pragma interrupt_handler timer0_comp_isr:16
void timer0_comp_isr(void){
   TCNT0 = 0x83;
   T0Count0++;
   
 //compare occured TCNT0=OCR0
}
//call this routine to initialize all peripherals
void delay(void)
{

UI i=0;
UI j=0;
for(j=0;j<500;j++)
{
 WDR();
 for(i=0;i<5000;i++);
 }
 
}
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 XDIV  = 0x00; //xtal divider//系统时钟分频控制寄存器
 XMCRA = 0x0E; //external memory//外部存储器控制寄存器
 XMCRB = 0x80;
 port_init();
timer0_init();
 MCUCR = 0xC0;//MCU控制寄存器
 EICRA = 0x0A; //extended ext ints//外部中断控制寄存器
 EICRB = 0x0F; //extended ext ints
 EIMSK = 0x33; //0x03 extended ext enable
 TIMSK = 0x12; //timer interrupt sources  01:time0
 ETIMSK =0x00; //extended timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}
void main(void)
{
watchdog_init();
 WDR();
 init_devices();
 while(1)
 {
   UI i=0;
   WDR();
   if(T0Count0>10)
   {
    UC mid=0x01;
    WDR();
    T0Count0=0;
	
	for(i=0;i<8;i++)
	{
	 delay();
	 PORTB=~mid;
	 mid=mid*2;
	 
	}
		
	PORTB=0xFF;
	delay();
	PORTD=0xEF;
	delay();
	PORTD=0xDF;
	delay();
	PORTD=0xBF;
	delay();
	PORTD=0x7F;
	delay();
	PORTD=0xFF;
   }
 }
  
  
}