adcts.c

MBA2440(s3c2440)的 源代码文件 ARM920T内核。

/*****************************************
  NAME: Adcts.c
  DESC: ADC & Touch screen test
  HISTORY:
  2003.09.23:Leon YH KIM: draft ver 1.0
  2005.05.10: modified for MBA2440
 *****************************************/
#include <string.h>
#include "def.h"
#include "2440addr.h"
#include "2440lib.h"


#define REQCNT 30
//#define ADCPRS 9
#define ADCPRS 49
#define LOOP 1

int ReadAdc(int ch);    //Return type is int, Declare Prototype function
void __irq AdcTsAuto(void);

int count=0;
volatile int xdata, ydata;

void Test_Adc(void)
{
    int a0=0,a1=0,a2=0,a3=0; //Initialize variables
    int a4=0,a5=0,a6=0,a7=0; //Initialize variables

    Uart_Printf("The ADC_IN are adjusted to the following values.\n");
    Uart_Printf("Push any key to exit!!!\n");    
    Uart_Printf("ADC conv. freq.=%d(Hz)\n",(int)(PCLK/(ADCPRS+1.))); 
    // ADC Freq. = PCLK/(ADCPSR+1), ADC conversion time = 5CYCLES*(1/(ADC Freq.))
    
    while(Uart_GetKey()==0)
    {
	    a0=ReadAdc(0);	a1=ReadAdc(1);	a2=ReadAdc(2);	a3=ReadAdc(3);
	    a4=ReadAdc(4);	a5=ReadAdc(5);	a6=ReadAdc(6);	a7=ReadAdc(7);

	    Uart_Printf("AIN0: %04d AIN1: %04d AIN2: %04d AIN3: %04d", a0,a1,a2,a3);
	    Uart_Printf("AIN4: %04d AIN5: %04d AIN6: %04d AIN7: %04d \n", a4,a5,a6,a7);
   }
    
    rADCCON=(0<<14)+(19<<6)+(7<<3)+(1<<2);     //stand by mode to reduce power consumption 
    Uart_Printf("rADCCON = 0x%x\n", rADCCON);
}

        
int ReadAdc(int ch)
{
    int i;
    static int prevCh=-1;

    if(prevCh!=ch){
		rADCCON=(1<<14)+(ADCPRS<<6)+(ch<<3);   //setup channel, ADCPRS
		for(i=0;i<LOOP;i++);    //delay to set up the next channel
		prevCh=ch;
	}
	
    rADCCON=(1<<14)+(ADCPRS<<6)+(ch<<3);   //setup channel, ADCPRS
    rADCTSC = rADCTSC & 0xfb;     //Normal ADC conversion & No TS operation
    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
    return (rADCDAT0&0x3ff);
}

    
void Test_AdcTs(void)
{
	Uart_Printf("[ADC touch screen test.]\n");

    rADCDLY=50000;		//Normal conversion mode delay about (1/3.6864M)*50000=13.56ms
	rADCCON = (1<<14)|(ADCPRS<<6)|(0<<3)|(0<<2)|(0<<1)|(0);
	rADCTSC=(0<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);

    pISR_ADC = (int)AdcTsAuto;
	rINTMSK = ~BIT_ADC;//ADC Touch Screen Mask bit clear
	rINTSUBMSK = ~(BIT_SUB_TC);
	
	Uart_Printf("\nTouch LCD screen using stylus pen...\n");
	Uart_Printf("press any key if yoy wanna exit!!!\n");
	Uart_Getch();

	rINTSUBMSK|=BIT_SUB_TC;
	rINTMSK|=BIT_ADC;
	Uart_Printf("[Touch Screen Test.]\n");
}


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

	rINTSUBMSK|=(BIT_SUB_ADC|BIT_SUB_TC);	// Mask sub interrupt (ADC and TC)
	
    if(rADCDAT0 & 0x8000){
		Uart_Printf("\nStylus Up!!\n");
		rADCTSC = rADCTSC & 0xff;	// Set stylus down interrupt bit
    }else{
		Uart_Printf("\nStylus Down!!\n");
		rADCTSC=(0<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(1<<3)|(1<<2)|(0);
	
		rADCCON|=0x1;				// Start Auto conversion
		while(rADCCON & 0x1);		//check if Enable_start is low
		while(!(0x8000&rADCCON));	// Check ECFLG
	
		Uart_Printf("X-Posion[AIN5] is %04d\n", (0x3ff&rADCDAT0));
		Uart_Printf("Y-Posion[AIN7] is %04d\n", (0x3ff&rADCDAT1));
		rADCTSC=(1<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);
	}

    rSUBSRCPND|=BIT_SUB_TC;
    rINTSUBMSK=~(BIT_SUB_TC);	// Unmask sub interrupt (TC)
    ClearPending(BIT_ADC);
}