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 }; #endif volatile IOPreg *s2440IOP = (IOPreg *)IOP_BASE; volatile INTreg *s2440INT = (INTreg *)INT_BASE; UINT32 g_KeySysIntr[6]; HANDLE KeyThread; HANDLE KeyEvent; void Virtual_Alloc(); // Virtual allocation DWORD UserKeyProcessThread(void);//IST 线程 DWORD UserKeyProcessThread(void) { UINT32 IRQ; //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_EINT8 IRQ = 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_EINT11 IRQ = 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_EINT13 IRQ = 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_EINT14 IRQ = 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_EINT15 IRQ = 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_EINT19 IRQ = 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 - 0x09 if(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 - 0x26 if(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 - 0x0D if(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 - 0x28 if(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 - 0x25 if(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 - 0x27 if(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 alloc s2440IOP = (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 alloc s2440INT = (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(HANDLE hinstDLL, 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_CE case 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 == EINT8 s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 0)) | (0x3 << 0); // Falling-edge triggered. s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 6)) | (0x2 << 6); // GPG3 == EINT11 s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 12)) | (0x3 << 12); // Falling-edge triggered. s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 10)) | (0x2 << 10); // GPG5 == EINT13 s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 20)) | (0x3 << 20); // Falling-edge triggered. s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 12)) | (0x2 << 12); // GPG6 == EINT14 s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 24)) | (0x3 << 24); // Falling-edge triggered. s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 14)) | (0x2 << 14); // GPG7 == EINT15 s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 28)) | (0x3 << 28); // Falling-edge triggered. s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 22)) | (0x2 << 22); // GPG11 == EINT19 s2440IOP->rEXTINT2 = (s2440IOP->rEXTINT2 & ~(0x7<< 12)) | (0x3 << 12); // Falling-edge triggered. return TRUE; } DWORD KEY_Init(DWORD dwContext) { DWORD threadID; // thread ID RETAILMSG(1,(TEXT("KEY_Init----/r/n"))); // 1. Virtual Alloc Virtual_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！