WINCE关于SPI接口开发介绍

//============================================================================== // Copyright 2006 Mistral Software Pvt Ltd. // // Use of this software is controlled by the terms and conditions found // in the license agreement under which this software has been supplied. //============================================================================== // \file Dm644xSpiMdd.c // \brief This file contains the Hardware independent function implementation // which calls the PDD layer to do hardware specific things // \version // Includes #include "Dm644xSpi.h" // Debug Zones. #ifdef DEBUG #define DBG_INIT 0x0001 #define DBG_OPEN 0x0002 #define DBG_READ 0x0004 #define DBG_WRITE 0x0008 #define DBG_CLOSE 0x0010 #define DBG_IOCTL 0x0020 #define DBG_THREAD 0x0040 #define DBG_EVENTS 0x0080 #define DBG_CRITSEC 0x0100 #define DBG_FLOW 0x0200 #define DBG_IR 0x0400 #define DBG_NOTHING 0x0800 #define DBG_ALLOC 0x1000 #define DBG_FUNCTION 0x2000 #define DBG_WARNING 0x4000 #define DBG_ERROR 0x8000 DBGPARAM dpCurSettings = { TEXT("Serial"), { TEXT("Init"),TEXT("Open"),TEXT("Read"),TEXT("Write"), TEXT("Close"),TEXT("Ioctl"),TEXT("Thread"),TEXT("Events"), TEXT("CritSec"),TEXT("FlowCtrl"),TEXT("Infrared"),TEXT("User Read"), TEXT("Alloc"),TEXT("Function"),TEXT("Warning"),TEXT("Error")}, 0 }; #endif // Define some internally used functions BOOL SPI_Close(PSPI_OPEN_INFO pOpenHead); BOOL SPI_Deinit(PSPI_INFO pSerialHead); VOID EvaluateEventFlag(PVOID pHead, ULONG fdwEventMask); //============================================================================== //! \fn BOOL //! DllEntry( //! HINSTANCE hinstDll, //! DWORD dwReason, //! LPVOID lpReserved //! ) //! \brief SPI Dllentry Function //! \param HINSTANCE hinstDll, //! DWORD dwReason, //! LPVOID lpReserved //! \return Boolean //============================================================================== BOOL DllEntry( HINSTANCE hinstDll, DWORD dwReason, LPVOID lpReserved ) { if ( dwReason == DLL_PROCESS_ATTACH ) { DEBUGREGISTER(hinstDll); DEBUGMSG (ZONE_INIT, (TEXT("SPI process attach\r\n"))); DisableThreadLibraryCalls((HMODULE) hinstDll); } if ( dwReason == DLL_PROCESS_DETACH ) { DEBUGMSG (ZONE_INIT, (TEXT("process detach called\r\n"))); } return TRUE; } //============================================================================== //! \fn ULONG //! DoTxData( //! PSPI_INFO pSerialHead //! ) //! \brief Transmits the next available data //! \param PSPI_INFO pSerialHead //! \return No of Bytes Transmitted //============================================================================== ULONG DoTxData( PSPI_INFO pSerialHead ) { // Number of bytes to be transmitted ULONG Len; ULONG BytesWritten; DEBUGMSG (ZONE_WRITE, (TEXT("DoPutBytes waiting for CritSec %x.\r\n"), &(pSerialHead->TxBufferInfo.CS))); TxEnterCS(pSerialHead); DEBUGMSG (ZONE_WRITE, (TEXT("DoPutBytes got CritSec %x.\r\n"), &(pSerialHead->TxBufferInfo.CS))); // If device was closed from under us, stop transmitting if (!pSerialHead->OpenCnt) { DEBUGMSG (ZONE_THREAD|ZONE_WRITE , (TEXT("Device closed! Quit transmission!\r\n"))); DEBUGMSG (ZONE_WRITE, (TEXT("SerialEventHandler: %d sent up-to-now.\n\r"), pSerialHead->TxBytesSent)); pSerialHead->TxBufferInfo.Permissions = 0; pSerialHead->TxBufferInfo.TxCharBuffer = NULL; pSerialHead->TxBufferInfo.Length = 0; TxRead(pSerialHead) = 0; } if (pSerialHead->TxBufferInfo.TxCharBuffer && TxBytesAvail(pSerialHead)) { // Copy the present permissions //DWORD oldPerm = SetProcPermissions(pSerialHead->TxBufferInfo.Permissions); DEBUGMSG (ZONE_WRITE, (TEXT("TxRead = %d, TxLength = %d, TxBytesAvail = %d.\r\n"), TxRead(pSerialHead), TxLength(pSerialHead), TxBytesAvail(pSerialHead))); // Number of bytes to be transmitted Len = TxBytesAvail(pSerialHead); DEBUGMSG (ZONE_WRITE, (TEXT("About to copy %d bytes\r\n"), Len)); // Tranfer data BytesWritten = HWTxHandler(pSerialHead, TxBuffRead(pSerialHead), &Len); DEBUGMSG (ZONE_WRITE, (TEXT("%d bytes actually copied.\r\n"), Len)); // Update Fifo info pSerialHead->TxBytes += Len; pSerialHead->TxBytesSent += Len; TxRead(pSerialHead) += Len; //SetProcPermissions(oldPerm); SetEvent(pSerialHead->hTransmitEvent); } else { Len = 0; BytesWritten = HWTxHandler(pSerialHead, TxBuffRead(pSerialHead), &Len); DEBUGMSG (ZONE_WRITE, (TEXT("Transmission complete, %d bytes sent\r\n"), Len)); pSerialHead->TxBufferInfo.Permissions = 0; pSerialHead->TxBufferInfo.TxCharBuffer = NULL; pSerialHead->TxBufferInfo.Length = 0; TxRead(pSerialHead) = 0; SetEvent(pSerialHead->hTransmitEvent); } TxLeaveCS(pSerialHead); DEBUGMSG (ZONE_WRITE|ZONE_FUNCTION, (TEXT("DoPutBytes released CritSec: %x.\r\n"), &(pSerialHead->TxBufferInfo.CS))); return BytesWritten; } //============================================================================== //! \fn VOID //! SerialEventHandler( //! PSPI_INFO pSerialHead //! ) //! \brief Handles all the serial events //! \param PSPI_INFO pSerialHead //! \return None //============================================================================== VOID SerialEventHandler( PSPI_INFO pSerialHead ) { ULONG RoomLeft = 0; ULONG TotalLeft = 0; DWORD it = SPI_INTR_NONE; BOOL RxDataAvail = FALSE; DEBUGMSG (ZONE_THREAD, (TEXT("+SPIEventHandler, pHead 0x%X\r\n"), pSerialHead)); // We should not be here with Killthread flag asserted or // without a serialevent if (pSerialHead->KillRxThread || !pSerialHead->hSerialEvent) { DEBUGMSG (ZONE_THREAD, (TEXT("Exitting thread\r\n"))); SetEvent(pSerialHead->hKillDispatchThread); ExitThread(0); } if (pSerialHead->pAccessOwner) { SPI_INC_USAGE_CNT(pSerialHead->pAccessOwner); } while (TRUE) { // Get the Interrupt type if (!(it = HWGetIntrType (pSerialHead))) { DEBUGMSG (ZONE_THREAD, (TEXT("SPIEventHandler, No Interrupt.\r\n"))); break; } DEBUGMSG (ZONE_THREAD, (TEXT("SPIEventHandler, Interrupts 0x%X\r\n"), it)); if (it & SPI_INTR_RXOVR) { DEBUGMSG (ZONE_THREAD, (TEXT("Rx Overrun Interrupt, it:%x\r\n"), it)); SpiRxOverrunIntrHandler(pSerialHead); } if (it & SPI_INTR_RX) { // Get the index for Read and Write register DWORD RxWIndex=RxWrite(pSerialHead);