请高手帮我分析一段驱动的代码？菜鸟看不懂啊。

huchuanyi 2010-6-13 18:35 楼主

下面是一段中断流驱动的一部分，请问是实现什么功能？是几乘几的矩阵键盘吗？还请高手帮忙在后面帮我注释分析下。

本人只剩30积分了，全给了，很不好意思。
********************************************************************************************/
PRIVATE VOID EINT_ConfigInterruptPin(VOID)
{
  v_pIOPregs->GPFCON &=~(0x3<<8);
  v_pIOPregs->GPFCON |= (0x2<<6);

  v_pIOPregs->EXTINT1 &=~(0x7<<12);
  v_pIOPregs->EXTINT1 |= (0x2<<12);

  v_pIOPregs->GPECON &=~(0x3<<22);//set GPE11 output
  v_pIOPregs->GPECON |=(0x1<<22);

  v_pIOPregs->GPECON &=~(0x3<<26);//set GPE13 output
  v_pIOPregs->GPECON |=(0x1<<26);

  v_pIOPregs->GPGCON &=~(0x3<<12);//set GPG6 output
  v_pIOPregs->GPGCON |=(0x1<<12);

  v_pIOPregs->GPGCON &=~(0x3<<4);//set GPG2 output
  v_pIOPregs->GPGCON |=(0x1<<4);

  v_pIOPregs->GPEDAT &=~(0x01<<11);//set PGE11 0
  v_pIOPregs->GPEDAT &=~(0x01<<13);
  v_pIOPregs->GPGDAT &=~(0x01<<2);
  v_pIOPregs->GPGDAT &=~(0x01<<6);
}
***********************************************************************************
PRIVATE VOID EINT_ConfigPinDefault( )
{
v_pIOPregs->GPGCON &= ~(0X3<<6); //配置GPG3/EINT11为输入引脚

}
/*PRIVATE VOID EINT_ConfigPinEint(DWORD pinNo )
{

v_pIOPregs->rGPFCON = 0xAA55;
v_pIOPregs->rGPFDAT &= ~(0x0f);
}*/

*******************************************************************************************/
BOOL KEY_Scan(VOID)
{
v_pIOPregs->GPEDAT &=~(0x01<<11);
  v_pIOPregs->GPGDAT |=(0x01<<6);
v_pIOPregs->GPEDAT |=(0x01<<13);
v_pIOPregs->GPGDAT |=(0x01<<2);
if (v_pIOPregs->GPGDAT&(1<<3)==0)
{
gReadKeyValue=4;
}
v_pIOPregs->GPEDAT |=(0x01<<11);
  v_pIOPregs->GPGDAT &=~(0x01<<6);
v_pIOPregs->GPEDAT |=(0x01<<13);
v_pIOPregs->GPGDAT |=(0x01<<2);
if (v_pIOPregs->GPGDAT&(1<<3) == 0)
{
gReadKeyValue=5;
}
v_pIOPregs->GPEDAT |=(0x01<<11);
  v_pIOPregs->GPGDAT |=(0x01<<6);
v_pIOPregs->GPEDAT &=~(0x01<<13);
v_pIOPregs->GPGDAT |=(0x01<<2);
  if (v_pIOPregs->GPGDAT&(1<<3) == 0)
{
gReadKeyValue=6;
}
else
{
gReadKeyValue=14;
}
}
*******************************************************************************************/
DWORD EINTKey_IntrThread(PVOID pArg)
{
DWORD ret;
  DWORD pressRowNo;
DWORD pressColNo;

// 创建外部中断中断事件
gWaitEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

// 初始化外部按键中断: 注册中断事件, 允许外部中断
if (!(InterruptInitialize(SYSINTR_Key, gWaitEvent, 0, 0)))
{
RETAILMSG(1, (TEXT("ERROR: EINTKey: InterruptInitialize failed.\r\n")));
CloseHandle(gWaitEvent);
return 0;
}

// 外部按键中断线程开始运行
while (1)
{
ret = WaitForSingleObject(gWaitEvent, INFINITE);

if ((ret == WAIT_OBJECT_0 ) && (g_bKillIST == FALSE))
{
if(Key_IsPushed())
{
Sleep(20);
if(Key_IsPushed())
{
EINT_ConfigPinDefault( );
KEY_Scan();
SetEvent(gReadKeyEvent[0]);
RETAILMSG(1,(TEXT(":::The Key PUshed.\r\n")));
}
}
}
else
{
CloseHandle(gWaitEvent);
RETAILMSG(1, (TEXT("::: EINTKey_IntrThread Exit. \r\n")));
return 0;
} //if (ret != WAIT_OBJECT_0) or Error occurs

InterruptDone(SYSINTR_Key); /* 通知内核: 中断处理结束 */
}

  return 1;
}
*******************************************************************************************/
DWORD KEY_Read(DWORD Handle, LPVOID pBuffer, DWORD dwNumBytes)
{
DWORD ret;
DWORD waitMillSec;
DWORD *pReadBuffer;

if ((pBuffer == NULL) || (dwNumBytes <= 0))
return 0;

pReadBuffer = MapPtrToProcess(pBuffer, GetCallerProcess());
*pReadBuffer = 0;

/* 根据等待的时间值调整等待*/
/* if( * (pReadBuffer+1)==0)
{//无限等待
RETAILMSG(1, (TEXT("::: Wait Key Infine. \r\n")));
waitMillSec=INFINITE;
}
else
{
waitMillSec=* (pReadBuffer+1);
}*/

ret = WaitForMultipleObjects(2, gReadKeyEvent, FALSE, waitMillSec);
if (ret == WAIT_OBJECT_0)
{
ResetEvent(gReadKeyEvent[0]);
*pReadBuffer = gReadKeyValue;
return 1;
}
else if (ret == WAIT_OBJECT_0+1)
{
ResetEvent(gReadKeyEvent[1]);
*pReadBuffer = 0;
return 1;
}

return 0;
} // KEY_Read