pwn.c

AVR系列单片机Mage8PWM脉冲输出程序

/***********************************************
PB.0.4.5口接
**********************************************/
#include "iom8v.h"
#include "macros.h"
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0x63; //setup
 TCNT1L = 0xC0;
 OCR1AH = 0x00;
 OCR1AL = 0x00;
 OCR1BH = 0x9C;
 OCR1BL = 0x40;
 ICR1H  = 0x00;
 ICR1L  = 0x00;
 TCCR1A = 0xa1;
 TCCR1B = 0x01; //start Timer
  TCCR2 = 0x00; //stop
 ASSR  = 0x00; //set async mode
 TCNT2 = 0x00; //setup
 OCR2  = 0xFF;
 TCCR2 = 0x61; //start
}

//ADC initialize
// Conversion time: 52uS
void adc_init(void)
{
 ADCSR = 0x00; //disable adc
 ADMUX = 0x00; //select adc input 0
 ACSR  = 0x80;
 ADCSR = 0xe6;
 ADC=ADC>>1;
 ADCSR|=BIT(ADSC);
}
void main()
{
int W;
 DDRB  = 0xff;
 PORTB = 0x00;
 PORTC = 0xff;
 DDRC  = 0x00;
 PORTD = 0xf0;
 DDRD  = 0x00;
  timer1_init();
  adc_init();
  for(;;)
  {
  W=PIND; 
  switch (W)
    {
    case 1: PORTB=0x01;
	TCCR1A&=~0x30;
	TCCR2&=~0x30;
	TCCR1A|=0xc0; break;
    case 2: PORTB=0x01;
	TCCR1A|=0x30;
	TCCR2&=~0x30;
	TCCR1A&=~0xc0;break;
    case 3: PORTB=0x20;
	TCCR1A|=0x30;
	TCCR2&=~0x30;
	TCCR1A&=~0xc0;break;
    case 4: PORTB=0x20;
	TCCR1A&=~0xf0;
	TCCR2|=0x10;break;
    case 5: PORTB=0x10;
	TCCR1A&=~0xf0;
	TCCR2|=0x10;break;
    case 6: PORTB=0x10;
	TCCR1A&=~0x30;
	TCCR2&=~0x30;
	TCCR1A|=0xc0; break;
	default: TCCR1A&=~0xf0;
	TCCR2&=~0x30;
	}
  OCR2=ADCL;
  OCR1AL=ADCL;
  OCR1BL=ADCL;
  }
}