buzzer_test.c

使用embest IDE开发工具开发的基于LPC2294 的触摸屏开发

/*
**********************************************************************************************
*
*     		  Embest Info&Tech Co., Ltd.  All rights reserved.
*                   		  www.embedinfo.com
*			
*file:     		xxx.c/xxx.h 
*author:   		embest 
*establish: 	2006.xx.xx
*modify:		xx
*notes:			xx
**********************************************************************************************
*/

/*
**********************************************************************************************
*                                       include files
**********************************************************************************************
*/
#include	"..\..\com\lpc_lib_AD\lpc_lib_AD.h"
#include	"..\..\com\lpc_lib_pwm\lpc_lib_pwm.h"
/*
**********************************************************************************************
*                                     local function declare
**********************************************************************************************
*/
void buzzer_test(void);
/*
**********************************************************************************************
*                               extern function/variable declare
**********************************************************************************************
*/

/*
**********************************************************************************************
*                                  global variable define 
**********************************************************************************************
*/


/*
**********************************************************************************************
* name:		function name
* func:		effect
* para:		form parameter
* ret:		return value description
* modify:
* comment:		
**********************************************************************************************
*/		
	
void Main(void)
{	
	lpc_init_pll_manual();
									
 	buzzer_test();

}


void buzzer_test(void)
{
	INT32U i,data;
 	
	i = IODIR2;			//open buzzer latch
	i |= (0x1<<21);
	IODIR2 = i;	
	
	i = IOCLR2;
	i |= (0x1<<21);
	IOCLR2 = i;
	
	pwm_init(0,pwm3,1);//init pwm3 to buzzer
  	pwm_set_f(10);		//set lowest frequency as 10Hz
  	pwm_single_edge(pwm3,10,0.5);
  	pwm_enable();		//pwm enable

	
	AD_init(0,AIN6,0,0);
	while(1)
	{
	data=AD_value();	//convert AD value to buzzer frequency
	data=(data/8)*50+10;
	
	pwm_set_f(data);	
  	pwm_single_edge(pwm3,data,0.5);
	}
	
}