iar9-4.c

手把手教你学AVR单片机C程序设计实验程序

#include <iom16.h>
#include<intrinsics.h>
#define uchar unsigned char
#define uint unsigned int
#define CPL_BIT(x,y) (x^=(1<<y))
#define CLR_BIT(x,y) (x&=~(1<<y))
#define SET_BIT(x,y) (x|=(1<<y))
#define GET_BIT(x,y) (x&(1<<y))
#define xtal 8
uchar flagA=1,flagB=0;
//****************************************
void Delay_1ms(void)		
{ uint i;
 for(i=1;i<(uint)(xtal*143-2);i++)
    ;
}
//=============================================
void Delay_nms(uint n)		
{
 uint i=0;
   while(i<n)
   {Delay_1ms();
    i++;
   }
}

void port_init(void)
{
 PORTB = 0xFF; 
 DDRB  = 0xFF;
}

//TIMER1 initialize - prescale:256
// WGM: 7) PWM 10bit fast, TOP=0x03FF
// desired value: 32.768mSec
// actual value: 32.768mSec (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0x00; //setup
 TCNT1L = 0x00;
 OCR1AH = 0x03;
 OCR1AL = 0xFF;
 OCR1BH = 0x03;
 OCR1BL = 0xFF;
 ICR1H  = 0x03;
 ICR1L  = 0xFF;
 TCCR1A = 0x03;
 TCCR1B = 0x8C; //start Timer
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 __disable_interrupt(); //disable all interrupts
 port_init();
 timer1_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x1C; //timer interrupt sources
  __enable_interrupt();//re-enable interrupts 
}

void main(void) 
{
init_devices();
  while(1) 
  {
  Delay_nms(100);
  if(GET_BIT(flagA,0)==1)OCR1A+=20;
  if(OCR1A>1000)CLR_BIT(flagA,0);
   
  if(GET_BIT(flagA,0)==0)OCR1A-=20;
  if(OCR1A<20)SET_BIT(flagA,0); 
  //---------------------------
  if(GET_BIT(flagB,0)==1)OCR1B+=10;
  if(OCR1B>1010)CLR_BIT(flagB,0);
   
  if(GET_BIT(flagB,0)==0)OCR1B-=10;
  if(OCR1B<10)SET_BIT(flagB,0);   
  }						
}	

#pragma vector=TIMER1_COMPA_vect 
__interrupt void timer1_compa_isr(void)
{
 //compare occured TCNT1=OCR1A
  CLR_BIT(PORTB,0);
}

#pragma vector=TIMER1_COMPB_vect
__interrupt void timer1_compb_isr(void)
{
 //compare occured TCNT1=OCR1B
 CLR_BIT(PORTB,7);
}

#pragma vector=TIMER1_OVF_vect
__interrupt void timer1_ovf_isr(void)
{
 //TIMER1 has overflowed
 SET_BIT(PORTB,0);
 SET_BIT(PORTB,7);
}