S3C2440之触摸屏

1. {
2. inti;
3. U32saveAdcdly;
5. if(rADCDAT0&0x8000)
6. {
7. //Uart_Printf("StylusUp!!");
8. rADCTSC&=0xff;//Setstylusdowninterruptbit
9. }
10. //else
11. //Uart_Printf("StylusDown!!");
13. rADCTSC=(1<3)|(1<2);//Pull-updisable,（在触发中断后，上拉电阻要无效）Seq.X,Ypostionmeasure.
14. saveAdcdly=rADCDLY;//saveADCDLY(启动延时)
15. rADCDLY=40000;//Normalconversionmodedelayabout(1/50M)*40000=0.8ms
17. rADCCON|=0x1;//startADC
19. while(rADCCON&0x1);//checkifEnable_startislow，转换开启结束
20. while(!(rADCCON&0x8000));//checkifEC(EndofConversion)flagishigh,Thislineisnecessary~!!
21. //conversionover
22. while(!(rSRCPND&(BIT_ADC)));//checkifADCisfinishedwithinterruptbit,等待中断清零？
24. xdata=(rADCDAT0&0x3ff);
25. ydata=(rADCDAT1&0x3ff);//读取转换结果,x轴坐标值放入rADCDAT0，y轴坐标值放入ADCDAT1
27. //YH0627,TocheckStylusUpInterrupt.
28. rSUBSRCPND|=BIT_SUB_TC;
29. ClearPending(BIT_ADC);//清楚中断标志位
30. rINTSUBMSK=~(BIT_SUB_TC);//使能中断？
31. rINTMSK=~(BIT_ADC);
33. rADCTSC=0xd3;//Waitingforinterrupt//[0:7]Wfait,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En
34. rADCTSC=rADCTSC|(1<8);//Detecttylusupsinterruptsignal.检查触笔抬起中断
36. while(1)//tocheckPen-upstate
37. {
38. if(rSUBSRCPND&(BIT_SUB_TC))//checkifADCisfinishedwithinterruptbit
39. {
40. //Uart_Printf("StylusUpInterrupt~!");//触笔抬起!
41. break;//ifStylusisup(1)state
42. }
43. }
45. Uart_Printf("count=dXP=d,YP=d",count++,xdata,ydata);//X-positionConversiondata
47. rADCDLY=saveAdcdly;//恢复ADCDLY原值
48. rADCTSC=rADCTSC&~(1<8);//DetectstylusDowninterruptsignal.检查触笔落下中断(下一次检测)
49. rSUBSRCPND|=BIT_SUB_TC;
50. rINTSUBMSK=~(BIT_SUB_TC);//Unmasksubinterrupt(TC)//使能中断
51. ClearPending(BIT_ADC);
52. }

效果图：