lpc_lib_ad.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"

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


/*
**********************************************************************************************
* name:		AD_init
* func:		Initialize the AD change channel,include select AD change mode (soft/auto),
			selecting channel.if under auto mode,select trigger mode for starting change.
* para:		Chg_mode: 0 auto  1 soft ,AD_channel,AD_trigger_mode.
* ret:		none
* modify:
* comment:		
**********************************************************************************************
*/		
void AD_init(INT8U Chg_mode,AD_channel ad_ch,AD_trigger_mode tri_mode,INT8U edge)
{
	INT32U i;
	INT32U ain_sel;
	
	switch(ad_ch)
			{
			 case AIN4:		ain_sel=SEL_AIN4;
			 				break;	
			 case AIN5:		ain_sel=SEL_AIN5;
			 				break;
			 case AIN6:		ain_sel=SEL_AIN6;
			 				break;
			 case AIN7:		ain_sel=SEL_AIN7;
			 				break;
			 default:		
			 				break;
			 }
	
	if(Chg_mode==0)
	{
		i=ain_sel+CLKDIV+BURST_A+CLKS_0+PDN_N+TEST_0+START_A;
		ADCR=i;
			 							 						 						 			
	}
	else
	{
	
	}

}
/*
**********************************************************************************************
* name:		AD_read
* func:		Get the AD data 
* para:		none
* ret:		data of INT32U types
* modify:
* comment:		
**********************************************************************************************
*/	
INT32U AD_read(void)
{	
	INT32U data;
	while((ADDR&0x80000000)==0);
	data=ADDR;
	data=((data&DATA_MASK)>>6);
	return data;	
}
/*
**********************************************************************************************
* name:		AD_close
* func:		restore aint pin and all related register to reset value
* para:		none
* ret:		none
* modify:
* comment:		
**********************************************************************************************
*/	
void AD_close()
{	
	INT32U i;	
	i=SEL_DEFAULT;
	ADCR=i;	
}
/*
**********************************************************************************************
* name:		AD_value
* func:		Get the AD average value for 50 times
* para:		none
* ret:		data of INT32U types
* modify:
* comment:		
**********************************************************************************************
*/
INT32U AD_value(void)
{
	INT32U i,data;

	for(i=0,data=0;i<50;i++) //get average value for 50 times
	data+=AD_read();
	data=data/i;		
	return data;

}