pwm_ser.c

avr 单片机 iccavr 平台

#include<iom16v.h>
#include<macros.h>
#define uchar unsigned char 
#define uint unsigned int
#define xtal  6                     
uchar counter=0;
uchar key;
const uchar array[6]={0xa0,0xf9,0xc4,0xd0,0x99,0x92};
void intial(void)
{
TCCR0=0X6c;
TCNT0=0X0;
TIMSK=0X1;
TIFR=0X0;
DDRB=0x8;          //PB3输出
PORTB=0x8;
DDRA=0xFC;		   //Pa0，Pa1输入
PORTA=0Xff; 
DDRD=0XFF;
PORTD=0X0;                 
_SEI();
}

void delay10ms(void) 
{ 
    uint i; 
	uchar j=10;
    while(j--)    
   { 
     for(i=1;i<(uint)(xtal*143-2);i++) 
         ; 
   }   
} 

uchar key_decord(void)
{
 uchar y;
 uchar t; 
 t=PINA&3;
 delay10ms();
 t=PINA&3;
 switch (t)
 {case 0: y=2;break;
  case 1: y=3;break;
  case 2: y=1;break;
  default:  y=0;} 
 return(y);
}

#pragma interrupt_handler T0_ov:10 
void T0_ov(void)
{
 uchar t;
 TIFR^=0X1;
 switch (key)
 {case 0: OCR0=12;  PORTD=array[0];break;      //-90度
  case 1: OCR0= 25; PORTD=array[1];break;     //-45度
  case 2: OCR0=36;  PORTD=array[2];break;      //0度	 
  case 3: OCR0=48;  PORTD=array[3];break;      //45度
  case 4: OCR0=60;  PORTD=array[4];break;      //90度
  default:OCR0=36;  PORTD=array[0] ;  }
}




main()
{
intial();
 do 
 {/*_CLI();
  key=key_decord();
  _SEI();
  */
  key=0;
 }while(1);
  
  
}