S3C2440触摸屏代码疑惑
学ARM也有几个星期了，但看代码还是有点难度，下面是S3C2440触摸屏中断处理的代码，有一些自己理解的写上去了但不知道正不正确，贴上来交流一下，感觉那些注释掉的代码不用也可以正常运行，请教一下各位大侠那些代码的作用void __irq AdcTsAuto(void)
{
//中断一触发说明光标按下，按下来进行ADC转换
//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); //设置成自动检测x，y坐标
//saveAdcdly=rADCDLY;
//rADCDLY=40000; //Normal conversion mode delay about (1/50M)*40000=0.8ms
.
rADCCON|=0x1; //ADC转换开始，开始后该位清零
while(rADCCON & 0x1); //开始后第一位清零，检测是否开始
while(!(rADCCON & 0x8000)); //检测ADC转换是否结束
while(!(rSRCPND & (BIT_ADC))); //检测中断INT_ADC是否已请求
xdata=(rADCDAT0&0x3ff);
ydata=(rADCDAT1&0x3ff);
//再度启用中断看光标是否已抬起，抬起则跳出while循环
rSUBSRCPND|=BIT_SUB_TC;
ClearPending(BIT_ADC);
rINTSUBMSK=~(BIT_SUB_TC);
rINTMSK=~(BIT_ADC);
rADCTSC =0xd3; //等待中断Wfait,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En
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若INT_TC已请求
{
//Uart_Printf("Stylus Up Interrupt~!\n");
break; //if Stylus is up(1) state
}
}
Uart_Printf("count=%03dXP=%04d, YP=%04d\n", count++, xdata, ydata);
//rADCDLY=saveAdcdly;
rADCTSC=rADCTSC&~(1<<8); // Detect stylus Down interrupt signal
rSUBSRCPND|=BIT_SUB_TC;
rINTSUBMSK=~(BIT_SUB_TC);
ClearPending(BIT_ADC);
}
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