pwm.c

ATMEL ATSAM7S64处理器部分控制程序。

/*********************************************************************************************
* File：	pwm.c
* Author:	Embest z.j.zheng
* Desc：	test pwm function through buzzer
* History:	
*********************************************************************************************/
/*------------------------------------------------------------------------------------------*/
/*								include files												*/
/*------------------------------------------------------------------------------------------*/
#include	<board.h>

/*********************************************************************************************
* name:		time_dly
* func:		display code
* para:		dly			--in, delay value
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  time_dly(int dly)
{  
	int  i;

	for(; dly>0; dly--) 
		for(i=0; i<500; i++);
}

/*********************************************************************************************
* name:		pwm_Init
* func:		init the pwm
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void pwm_Init(void)
{
	AT91F_PWMC_InterruptDisable(AT91C_BASE_PWMC,AT91C_PWMC_CHID0);  //Disable PWM Interrupt
	AT91F_PWMC_CfgChannel(AT91C_BASE_PWMC,0,
				(AT91C_PWMC_CPRE_MCK | AT91C_PWMC_CALG | AT91C_PWMC_CPOL | AT91C_PWMC_CPD),
						AT91C_PWMC_CPRD,AT91C_PWMC_CDTY);
	AT91F_PWMC_StartChannel(AT91C_BASE_PWMC,AT91C_PWMC_CHID0);	    //Enable channel
}

/*********************************************************************************************
* name:		Main
* func:		main fun
* para:		none
* ret:		none
* modify:
* comment:	
*********************************************************************************************/
int  Main(void)
{
	unsigned int	i; 
	
	//enable the clock of the PIO
	AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1 << AT91C_ID_PIOA ) ;
	AT91F_PWMC_CH0_CfgPIO();
	AT91F_PWMC_CfgPMC();

	AT91F_PIO_CfgInput( AT91C_BASE_PIOA, SW1_MASK ) ;
			  
	pwm_Init();
	 
	do
	{	
		i= AT91F_PIO_GetInput(AT91C_BASE_PIOA);
		// detect whether button1 or button1 pushed down
		if( (i&SW1) == 0 ) AT91F_PWMC_StopChannel(AT91C_BASE_PWMC,AT91C_PWMC_CHID0);			
		else if( (i&SW2) == 0 ) AT91F_PWMC_StartChannel(AT91C_BASE_PWMC,AT91C_PWMC_CHID0);
	} while(1);
	
}