timer2.c

本人用AVR mega32写的一个关于输出32路PWM的程序

#define   EXT_TIMER2_GLOBALS
#include "includes.h" 




/************************************************************
 Function Name:  T2Init
 Function:       Timer0 initial
 Paramenter:     None               
 Return value:   None                     
 Author:         Chen yuan zhen May.30.2008 
*************************************************************/
void T2Init(void) 
{
	
	OCR2A   = 77;				      /* 10ms频率为100hz*/
    TCCR2A  = 8;                      /*CTC模式*/
	TIMSK2 |= (1<<OCIE2A);        	  /*中断允许*/

}


/************************************************************
 Function Name:  T2Start
 Function:       Timer0 start
 Paramenter:     None               
 Return value:   None                     
 Author:         Chen yuan zhen May.30.2008 
*************************************************************/
void T2Start(void)
{
    TCNT2   = 0;
	TCCR2A  |= 0x07;                  /*设置定时器的分频值为1024分频并开始*/
} 
                                    

/************************************************************
 Function Name:  T2Close
 Function:       Timer0 close
 Paramenter:     None               
 Return value:   None                     
 Author:         Chen yuan zhen May.30.2008 
*************************************************************/
void T2Close(void)
{
	TCCR2A  &= 0xF8;                  /*关闭定时器*/
} 



/************************************************************
 Function Name:  SIGNAL(TIMER0_COMPA_vect)
 Function:       Timer0 interrupt
 Paramenter:     TIMER0_COMPA_vect               
 Return value:   None                     
 Author:         Chen yuan zhen May.30.2008 
*************************************************************/
SIGNAL(TIMER2_COMP_vect)  
{
	PCTimeCounter++;
}