从键盘驱动分析wince中断机制

首先说一下该段代码是摘自友善的wince5.0 BSP.在友善的micro2440开发板上有六个按键，通过驱动程序把他们设置成了TAB键，RIGHT DOWN,LEFT DOWN ,ENTER,RIGHT,LEFT等六个功能键。具体代码如下：

 #include <windows.h>//#include <ceddk.h>#include <nkintr.h>//#include <oalintr.h>#include <pm.h>#include "pmplatform.h"#include "Pkfuncs.h"#include "s2440.h"#ifdef DEBUG DBGPARAM dpCurSettings = { TEXT("USERKEY"), { TEXT("Error"), TEXT("Warn"), TEXT("Init"), TEXT("Open"), TEXT("Read"), TEXT("Write"), TEXT("IOCTL"), TEXT("IST"), TEXT("Power"), TEXT("9"), TEXT("10"), TEXT("11"), TEXT("12"), TEXT("13"), TEXT("14"), TEXT("Trace"), }, 0x0003 // ZONE_WRN|ZONE_ERR }; #endifvolatile IOPreg *s2440IOP = (IOPreg *)IOP_BASE;volatile INTreg *s2440INT = (INTreg *)INT_BASE;UINT32 g_KeySysIntr[6];HANDLE KeyThread;HANDLE KeyEvent;void Virtual_Alloc(); // Virtual allocationDWORD UserKeyProcessThread(void);//IST 线程DWORD UserKeyProcessThread(void){UINT32IRQ;//创建事件，后面与中断关联 KeyEvent = CreateEvent(NULL, FALSE, FALSE, NULL); if (!KeyEvent) { RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to create event./r/n"))); return FALSE; } //动态申请外部中断IRQ_EINT8IRQ = 36; //IRQ_EINT8; if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &IRQ, sizeof(UINT32), &g_KeySysIntr[0], sizeof(UINT32), NULL)) { RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to request sysintr value./r/n"))); return FALSE; } //动态申请外部中断IRQ_EINT11IRQ = 39; //IRQ_EINT11; if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &IRQ, sizeof(UINT32), &g_KeySysIntr[1], sizeof(UINT32), NULL)) { RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to request sysintr value./r/n"))); return FALSE; } //动态申请外部中断IRQ_EINT13IRQ = 41; //IRQ_EINT13; if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &IRQ, sizeof(UINT32), &g_KeySysIntr[2], sizeof(UINT32), NULL)) { RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to request sysintr value./r/n"))); return FALSE; } //动态申请外部中断IRQ_EINT14IRQ = 42; //IRQ_EINT14; if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &IRQ, sizeof(UINT32), &g_KeySysIntr[3], sizeof(UINT32), NULL)) { RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to request sysintr value./r/n"))); return FALSE; } //动态申请外部中断IRQ_EINT15IRQ = 43; //IRQ_EINT15; if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &IRQ, sizeof(UINT32), &g_KeySysIntr[4], sizeof(UINT32), NULL)) { RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to request sysintr value./r/n"))); return FALSE; } //动态申请外部中断IRQ_EINT19IRQ = 47; //IRQ_EINT19; if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &IRQ, sizeof(UINT32), &g_KeySysIntr[5], sizeof(UINT32), NULL)) { RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to request sysintr value./r/n"))); return FALSE; } //初始化中断，关联逻辑中断号与事件 if (!InterruptInitialize(g_KeySysIntr[0], KeyEvent, NULL, 0)) { RETAILMSG(1,(TEXT("Fail to initialize userkey interrupt event/r/n"))); return FALSE; } if (!InterruptInitialize(g_KeySysIntr[1], KeyEvent, NULL, 0)) { RETAILMSG(1,(TEXT("Fail to initialize userkey interrupt event/r/n"))); return FALSE; } if (!InterruptInitialize(g_KeySysIntr[2], KeyEvent, NULL, 0)) { RETAILMSG(1,(TEXT("Fail to initialize userkey interrupt event/r/n"))); return FALSE; } if (!InterruptInitialize(g_KeySysIntr[3], KeyEvent, NULL, 0)) { RETAILMSG(1,(TEXT("Fail to initialize userkey interrupt event/r/n"))); return FALSE; } if (!InterruptInitialize(g_KeySysIntr[4], KeyEvent, NULL, 0)) { RETAILMSG(1,(TEXT("Fail to initialize userkey interrupt event/r/n"))); return FALSE; } if (!InterruptInitialize(g_KeySysIntr[5], KeyEvent, NULL, 0)) { RETAILMSG(1,(TEXT("Fail to initialize userkey interrupt event/r/n"))); return FALSE; } while(1){ //等待事件发生WaitForSingleObject(KeyEvent, INFINITE);RETAILMSG(0,(L"EINTMASK=%X, rGPGCON=%X/r/n", s2440IOP->rEINTMASK, s2440IOP->rGPGCON));//处理外部中断EINT8//EINT8 - K1 - VK_TAB - 0x09if(s2440IOP->rEINTMASK & (DWORD)(0x1<<8)){RETAILMSG(1,(TEXT("[Key1 - TAB]/r/n")));keybd_event(VK_TAB ,0x09, 0, 0);//向应用程序发生按键按下消息Sleep(30);//延时keybd_event(VK_TAB ,0x09, KEYEVENTF_KEYUP, 0);//向应用程序发送按键抬起消息InterruptDone(g_KeySysIntr[0]);//完成中断}//EINT11 - K2 - VK_UP - 0x26if(s2440IOP->rEINTMASK & (DWORD)(0x1<<11)){RETAILMSG(1,(TEXT("[Key2 - UP]/r/n")));keybd_event(VK_UP ,0x26, 0, 0);Sleep(30);keybd_event(VK_UP ,0x26, KEYEVENTF_KEYUP, 0);InterruptDone(g_KeySysIntr[1]);}//EINT13 - K3 - VK_RETURN - 0x0Dif(s2440IOP->rEINTMASK & (DWORD)(0x1<<13)){RETAILMSG(1,(TEXT("[K3 - RETURN]/r/n")));keybd_event(VK_RETURN ,0x0D, 0, 0);Sleep(30);keybd_event(VK_RETURN ,0x0D, KEYEVENTF_KEYUP, 0);InterruptDone(g_KeySysIntr[2]);}//EINT14 - K4 - VK_DOWN - 0x28if(s2440IOP->rEINTMASK & (DWORD)(0x1<<14)){RETAILMSG(1,(TEXT("[K4 - DONW]/r/n")));keybd_event(VK_DOWN ,0x28, 0, 0);Sleep(30);keybd_event(VK_DOWN ,0x28, KEYEVENTF_KEYUP, 0);InterruptDone(g_KeySysIntr[3]);}//EINT15 - K5 - VK_LEFT - 0x25if(s2440IOP->rEINTMASK & (DWORD)(0x1<<15)){RETAILMSG(1,(TEXT("[K5 - LEFT]/r/n")));keybd_event(VK_LEFT ,0x25, 0, 0);Sleep(30);keybd_event(VK_LEFT ,0x25, KEYEVENTF_KEYUP, 0);InterruptDone(g_KeySysIntr[4]);}//EINT19 - K6 - VK_RIGHT - 0x27if(s2440IOP->rEINTMASK & (DWORD)(0x1<<19)){RETAILMSG(1,(TEXT("[K6 - RIGHT]/r/n")));keybd_event(VK_RIGHT ,0x27, 0, 0);Sleep(30);keybd_event(VK_RIGHT ,0x27, KEYEVENTF_KEYUP, 0);InterruptDone(g_KeySysIntr[5]);}}}void Virtual_Alloc(){ //分配虚拟地址空间，程序结束时要记得释放 // GPIO Virtual allocs2440IOP = (volatile IOPreg *) VirtualAlloc(0,sizeof(IOPreg),MEM_RESERVE, PAGE_NOACCESS);if(s2440IOP == NULL) {RETAILMSG(1,(TEXT("For s2440IOP: VirtualAlloc failed!/r/n")));}else {if(!VirtualCopy((PVOID)s2440IOP,(PVOID)(IOP_BASE),sizeof(IOPreg),PAGE_READWRITE | PAGE_NOCACHE )) {RETAILMSG(1,(TEXT("For s2440IOP: VirtualCopy failed!/r/n")));}} // Interrupt Virtual allocs2440INT = (volatile INTreg *) VirtualAlloc(0,sizeof(INTreg),MEM_RESERVE, PAGE_NOACCESS);if(s2440INT == NULL) {RETAILMSG(1,(TEXT("For s2440INT: VirtualAlloc failed!/r/n")));}else {if(!VirtualCopy((PVOID)s2440INT,(PVOID)(INT_BASE),sizeof(INTreg),PAGE_READWRITE | PAGE_NOCACHE )) {RETAILMSG(1,(TEXT("For s2440INT: VirtualCopy failed!/r/n")));}}}BOOL WINAPI DllEntry(HANDLEhinstDLL, DWORD dwReason, LPVOID Reserved/* lpvReserved */){switch(dwReason){case DLL_PROCESS_ATTACH:DEBUGREGISTER((HINSTANCE)hinstDLL);return TRUE;case DLL_THREAD_ATTACH:break;case DLL_THREAD_DETACH:break;case DLL_PROCESS_DETACH:break;#ifdef UNDER_CEcase DLL_PROCESS_EXITING:break;case DLL_SYSTEM_STARTED:break;#endif}return TRUE;}BOOL KEY_Deinit(DWORD hDeviceContext){BOOL bRet = TRUE;RETAILMSG(1,(TEXT("USERKEY: KEY_Deinit/r/n")));//s2440INT->rINTMSK |= BIT_EINT8_23;for (int i=0; i<6; i++)InterruptDisable(g_KeySysIntr[i]);CloseHandle(KeyThread);CloseHandle(KeyEvent);VirtualFree((void*)s2440IOP, sizeof(IOPreg), MEM_RELEASE);VirtualFree((void*)s2440INT, sizeof(INTreg), MEM_RELEASE);return TRUE;} //GPIO端口初始化，设置中断模式BOOL KeyGpioInit(){RETAILMSG(1,(TEXT("Key_Gpio_Setting----/r/n")));s2440IOP->rGPGUP = 0xffff;s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 0x0)) | (0x2 << 0x0);// GPG0 == EINT8s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 0)) | (0x3 << 0);// Falling-edge triggered.s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 6)) | (0x2 << 6);// GPG3 == EINT11s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 12)) | (0x3 << 12);// Falling-edge triggered.s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 10)) | (0x2 << 10);// GPG5 == EINT13s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 20)) | (0x3 << 20);// Falling-edge triggered.s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 12)) | (0x2 << 12);// GPG6 == EINT14s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 24)) | (0x3 << 24);// Falling-edge triggered.s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 14)) | (0x2 << 14);// GPG7 == EINT15s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 28)) | (0x3 << 28);// Falling-edge triggered.s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 22)) | (0x2 << 22);// GPG11 == EINT19s2440IOP->rEXTINT2 = (s2440IOP->rEXTINT2 & ~(0x7<< 12)) | (0x3 << 12);// Falling-edge triggered.return TRUE;}DWORD KEY_Init(DWORD dwContext){DWORD threadID; // thread IDRETAILMSG(1,(TEXT("KEY_Init----/r/n")));// 1. Virtual AllocVirtual_Alloc();KeyGpioInit();//创建IST线程 KeyThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)UserKeyProcessThread, 0, 0, &threadID); if (NULL == KeyThread ) { RETAILMSG(1,(TEXT("ERROR: failed to Create Key Thread!/r/n")));return FALSE; }return TRUE;}//-----------------------------------------------------------------------------//-----------------------------------------------------------------------------BOOL KEY_IOControl(DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn, DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut){ return TRUE;} //-----------------------------------------------------------------------------//-----------------------------------------------------------------------------DWORD KEY_Open(DWORD hDeviceContext, DWORD AccessCode, DWORD ShareMode){return TRUE;} //-----------------------------------------------------------------------------//-----------------------------------------------------------------------------BOOL KEY_Close(DWORD hOpenContext){return TRUE;} //-----------------------------------------------------------------------------//-----------------------------------------------------------------------------void KEY_PowerDown(DWORD hDeviceContext){} //-----------------------------------------------------------------------------//-----------------------------------------------------------------------------void KEY_PowerUp(DWORD hDeviceContext){RETAILMSG(1,(TEXT("USERKEY: KEY_PowerUp/r/n")));} //-----------------------------------------------------------------------------//-----------------------------------------------------------------------------DWORD KEY_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count){RETAILMSG(1,(TEXT("USERKEY: KEY_Read/r/n")));return TRUE;} //-----------------------------------------------------------------------------//-----------------------------------------------------------------------------DWORD KEY_Seek(DWORD hOpenContext, long Amount, DWORD Type){return 0;} //-----------------------------------------------------------------------------//-----------------------------------------------------------------------------DWORD KEY_Write(DWORD hOpenContext, LPCVOID pSourceBytes, DWORD NumberOfBytes){return 0;}

从代码可以看出结构和流程都十分清晰，在此总结一下动态申请中断的大致流程：

1》创建事件 CreateEvent()

2》动态申请逻辑中断号 KernelIoControl()

3》初始化申请到的中断  InterruptInitialize()

4》创建IST线程，在线程中调用WaitForSingleObject()等待事件发生并进行中断处理

5》结束中断 InterruptDone()

有一点需要提醒，凡是程序中开发者主动申请的内存，句柄，事件等一定要记得释放，否则程序可能会得到你意想不到的结果！