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ARM9 S3C2440—ADC和触摸屏控制详解

时间:11-28 来源:互联网 点击:

ile(!(rSRCPND&0x80000000));//checkifADCisfinishedwithinterruptbit

xdata=(rADCDAT0&0x3ff);

ydata=(rADCDAT1&0x3ff);
7、对几个寄存器写1清零,防止反复发生中断(这里的中断是笔尖按下中断)
ClearSubPending(BIT_SUB_TC);

ClearPending(BIT_ADC);

/rSRCPND=0x80000000;rINTPND=0x80000000;也可以

8、再次允许中断

允许触摸笔被弹起的中断

EnableSubIrq(BIT_SUB_TC);

EnableIrq(BIT_ADC);//rINTMSK=0x7fffffff;

二)触摸笔抬起中断
9、设置触摸屏即可为等待中断模式,等待触摸笔抬起(ADCTSC,关键是要设置触摸笔抬起中断信号)

rADCTSC=0xd3;//Waitingforinterrupt

rADCTSC=rADCTSC|(1<8);//Detectstylusupinterruptsignal.
10、如果发生中断,不做任何操作,只打印出一句触摸笔抬起中断信息

while(1)//tocheckPen-upstate

{

if(rSUBSRCPND&(BIT_SUB_TC))//checkifADCisfinishedwithinterruptbit

{

Uart_Printf("StylusUpInterrupt~!");

break;//ifStylusisup(1)state

}

}

Uart_Printf("count=dXP=d,YP=d",count++,xdata,ydata);
11、触摸笔抬起之后,把得到的x,y坐标值发送给PC机,显示出具体数值
三)再次设置触摸屏为等待中断模式,等待下次触摸屏被按下

rADCTSC=0xd3;//Waitingforinterrupt

ClearSubPending(BIT_SUB_TC);

ClearPending(BIT_ADC);

EnableSubIrq(BIT_SUB_TC);

EnableIrq(BIT_ADC);

示例程序如下:

#defineGLOBAL_CLK1

#include

#include

#include"def.h"

#include"option.h"

#include"2440addr.h"

#include"2440lib.h"

#include"2440slib.h"

#include"mmu.h"

#include"profile.h"

#include"memtest.h"

#defineADC_FREQ2500000

intcount=0;

volatileU32preScaler;

intxdata,ydata;

voidTest_Touchpanel(void);

staticvoid__irqAdcTsAuto(void);

staticvoidcal_cpu_bus_clk(void);

voidSet_Clk(void);

voiddelay(inttimes)

{

inti,j;

for(i=0;i

for(j=0;j<400;j++);

}

intMain(void)

{

intScom=0;

Set_Clk();

Uart_Init(0,115200);

Uart_Select(Scom);

Test_Touchpanel();

while(1);

return0;

}

voidTest_Touchpanel(void)

{

rADCDLY=50000;//Normalconversionmodedelayabout(1/3.6864M)*50000=13.56ms

preScaler=ADC_FREQ;

preScaler=50000000/ADC_FREQ-1;//PCLK=50M

rADCCON=(1<14)|(preScaler<6);//ADCPRSEn,PRSCVL

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

rSRCPND=0x80000000;

rINTPND=0x80000000;

ClearSubPending(BIT_SUB_TC);

pISR_ADC=(U32)AdcTsAuto;

rINTMSK=0x7fffffff;

EnableSubIrq(BIT_SUB_TC);

}

staticvoid__irqAdcTsAuto(void)

{

U32saveAdcdly;

if(rSUBSRCPND&(BIT_SUB_TC))

{

if(!(rADCDAT0&0x8000))

Uart_Printf("Stylusdown");

else

Uart_Printf("Stylusup");

}

rADCTSC=(1<3)|(1<2);

saveAdcdly=rADCDLY;

rADCDLY=40000;//Normalconversionmodedelayabout(1/50M)*40000=0.8ms

rADCCON|=0x1;//startADC

while(rADCCON&0x1);//checkifEnable_startislow

while(!(rADCCON&0x8000));//checkifEC(EndofConversion)flagishigh,Thislineisnecessary~!!

while(!(rSRCPND&0x80000000));//checkifADCisfinishedwithinterruptbit

xdata=(rADCDAT0&0x3ff);

ydata=(rADCDAT1&0x3ff);

ClearSubPending(BIT_SUB_TC);

//ClearPending(BIT_ADC);

rSRCPND=0x80000000;

rINTPND=0x80000000;

EnableSubIrq(BIT_SUB_TC);

//EnableIrq(BIT_ADC);

rINTMSK=0x7fffffff;

rADCTSC=0xd3;//Waitingforinterrupt

rADCTSC=rADCTSC|(1<8);//Detectstylusupinterruptsignal.

while(1)//tocheckPen-upstate

{

if(rSUBSRCPND&(BIT_SUB_TC))//checkifADCisfinishedwithinterruptbit

{

Uart_Printf("StylusUpInterrupt~!");

break;//ifStylusisup(1)state

}

}

Uart_Printf("count=dXP=d,YP=d",count++,xdata,ydata);

rADCDLY=saveAdcdly;

rADCTSC=0xd3;//Waitingforinterrupt

ClearSubPending(BIT_SUB_TC);

//ClearPending(BIT_ADC);

rSRCPND=0x80000000;

rINTPND=0x80000000;

EnableSubIrq(BIT_SUB_TC);

//EnableIrq(BIT_ADC);

rINTMSK=0x7fffffff;

}

voidSet_Clk(void)

{

inti;

U8key;

U32mpll_val=0;

i=2;//dontuse100M!

//boot_params.cpu_clk.val=3;

switch(i){

case0://200

key=12;

mpll_val=(92<12)|(4<4)|(1);

break;

case1://300

key=13;

mpll_val=(67<12)|(1<4)|(1);

break;

case2://400

key=14;

mpll_val=(92<12)|(1<4)|(1);

break;

case3://440!!!

key=14;

mpll_val=(102<12)|(1<4)|(1);

break;

default:

key=14;

mpll_val=(92<12)|(1<4)|(1);

break;

}

//initFCLK=400M,sochangeMPLLfirst

ChangeMPllValue((mpll_val>>12)&0xff,(mpll_val>>4)&0x3f,mpll_val&3);//settheregister--rMPLLCON

ChangeClockDivider(key,12);//theresultofrCLKdivN[0:1:0:1]3-0bit

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