ARM9触摸屏

ARM9触摸屏的程序的控制，主要对3个寄存器的控制

（1）、ADCCON 设置AD转化频率

 /*设置AD转频率*/

 preScaler = ADC_FREQ;

Uart_Printf("ADC conv,freq. = %dHz\n",preScaler);

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

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

// rADCCON=(1<<14)+(preScaler<<6);   //ADCPRS En, ADCPRS Value

（2）、ADCTSC设置触屏控制寄存器

/*设置触摸屏为等待中断模式，等待触摸笔被按下*/

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

（3）、SRCPND、INTPND设置寄存器，即设置父中断和子中断，即INT_ADC 和 INT_ADC_S、INT_TC

rSRCPND = 0x80000000;  //父中断 INT_ADC 

rINTPND = 0x80000000;//父中断  INT_ADC 

 ClearSubPending(BIT_SUB_TC); //SUBSRCPND 子中断  INT_TC

 pISR_ADC = (U32)AdcTsAuto;

/*enable INT_TC irq*/

//EnableIrq(BIT_ADC);

rINTMSK = 0x7fffffff;   

EnableSubIrq(BIT_SUB_TC)   //开启子中断 

#define EnableSubIrq(bit)rINTSUBMSK &= ~(bit)

#define BIT_SUB_TC(0x1<<9)

__inline void ClearSubPending(int bit)

{

register i;

rSUBSRCPND = bit;

i = rINTPND;

}

（4）、当中断产生时，引发中断服务程序

 pISR_ADC = (U32)AdcTsAuto;