touchpanel.c

2440 开发板的测试程序。包括uart,iic,lcd

/*****************************************
  NAME: Touchpanel.c
  DESC: ADC & Touch screen test
  HISTORY:
  2003.09.23:Leon YH KIM: draft ver 1.0
 *****************************************/
#include "def.h"
#include "2440addr.h"
#include "2440lib.h"


#define REQCNT 30
#define ADCPRS 9	//YH 0627
#define LOOP 1

void __irq AdcTsAuto( void );

int count = 0;
volatile int xdata, ydata;

void Test_Touchpanel( void )
{
	rADCDLY = 50000;				  //Normal conversion mode delay about (1/3.6864M)*50000=13.56ms
	rADCCON = ( 1 << 14 ) + ( ADCPRS << 6 );   //ADCPRS En, ADCPRS Value

	Uart_Printf( "ADC touch screen test\n" );

	rADCTSC = 0xd3;  //Wfait,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En

	pISR_ADC = ( int ) AdcTsAuto;
	rINTMSK = ~BIT_ADC; 	  //ADC Touch Screen Mask bit clear
	rINTSUBMSK = ~( BIT_SUB_TC );

	Uart_Printf( "\nType any key to exit!!!\n" );
	Uart_Printf( "\nStylus Down, please...... \n" );
	Uart_Getch();

	rINTSUBMSK |= BIT_SUB_TC;
	rINTMSK |= BIT_ADC;
	Uart_Printf( "Touch Screen Test is Finished!!!\n" );
}


void __irq AdcTsAuto( void )
{
	int i;
	U32 saveAdcdly;

	if ( rADCDAT0 & 0x8000 )
	{
		//Uart_Printf("\nStylus Up!!\n");
		rADCTSC &= 0xff;	// Set stylus down interrupt bit
	}
	//else 
	//Uart_Printf("\nStylus Down!!\n");

	rADCTSC = ( 1 << 3 ) | ( 1 << 2 );  	   //Pull-up disable, Seq. X,Y postion measure.
	saveAdcdly = rADCDLY;
	rADCDLY = 40000;				 //Normal conversion mode delay about (1/50M)*40000=0.8ms

	rADCCON |= 0x1; 				  //start ADC

	while ( rADCCON & 0x1 );		//check if Enable_start is low
	while ( !( rADCCON & 0x8000 ) );		//check if EC(End of Conversion) flag is high, This line is necessary~!!

	while ( !( rSRCPND & ( BIT_ADC ) ) );  //check if ADC is finished with interrupt bit

	xdata = ( rADCDAT0 & 0x3ff );
	ydata = ( rADCDAT1 & 0x3ff );

	//YH 0627, To check Stylus Up Interrupt.
	rSUBSRCPND |= BIT_SUB_TC;
	ClearPending( BIT_ADC );
	rINTSUBMSK = ~( BIT_SUB_TC );
	rINTMSK = ~( BIT_ADC );

	rADCTSC = 0xd3;    //Waiting for interrupt
	rADCTSC = rADCTSC | ( 1 << 8 ); // Detect stylus up interrupt signal.

	while ( 1 )		//to check Pen-up state
	{
		if ( rSUBSRCPND & ( BIT_SUB_TC ) )	//check if ADC is finished with interrupt bit
		{
			//Uart_Printf("Stylus Up Interrupt~!\n");
			break;	//if Stylus is up(1) state
		}
	}	

	Uart_Printf( "count=%03d  XP=%04d, YP=%04d\n" , count++ , xdata , ydata );    //X-position Conversion data  		  

	rADCDLY = saveAdcdly; 
	rADCTSC = rADCTSC & ~( 1 << 8 ); // Detect stylus Down interrupt signal.
	rSUBSRCPND |= BIT_SUB_TC;
	rINTSUBMSK = ~( BIT_SUB_TC );	// Unmask sub interrupt (TC)	 
	ClearPending( BIT_ADC );
}