main.c

ATmegal128的PWM测试程序

#include <iom128.h>
#include <ina90.h>
#define	TIME_FOR_B_SIGNAL	1		//	8MHz/(2100*2)	= 4388
#define	bTICIE1				0x20		//	Timer/Counter1 Input Capture Interrupt Enable
#define xtal 8

void delay_1ms(void)
	 {
	  unsigned int i;
 	  for(i=1;i<(unsigned int)(xtal*143-2);i++)
      	; 
	 }
	 

void delay_ms(unsigned int n)
	 {
 	  unsigned int i=0;
   	  while(i<n)
   	  		{
			 delay_1ms();
			 i++;
   			}
	 }

void main(void)
{
  _SEI();
  TCNT1	= 0x00;
  OCR1A	= TIME_FOR_B_SIGNAL;
  DDRB_Bit5 = 1;
  TCCR1A	= 0x83;						//	CTC Mode(OCR1A)
  TCCR1B	= 0xc9;						//	Noise Cancelar=OFF, Rising Edge, clk/1
  TIMSK	&= ~bTICIE1;				//	Timer/Counter1 Input Capture Interrupt Disable
  while(1)
  {
  delay_ms(100);
  OCR1A+=10;
  }
}