drivers/win32/drivers_win32.cpp
author leonid
Wed, 08 Aug 2007 18:40:47 +0200
changeset 257 4f3364846782
parent 241 4ecc2f3690f4
permissions -rw-r--r--
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/*
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This file is part of CanFestival, a library implementing CanOpen Stack.
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Copyright (C): Edouard TISSERANT and Francis DUPIN
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Copyright (C) Win32 Port Leonid Tochinski
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See COPYING file for copyrights details.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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*/
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/*
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 CAN driver interface.
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*/
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#include <windows.h>
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extern "C"
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   {
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#define DLL_CALL(funcname) (*_##funcname)
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#define FCT_PTR_INIT =NULL
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#include "canfestival.h"
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#include "timer.h"
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#include "timers_driver.h"
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   };
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typedef UNS8 (*CANRECEIVE_DRIVER_PROC)(void* inst, Message *m);
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typedef UNS8 (*CANSEND_DRIVER_PROC)(void* inst, const Message *m);
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typedef void* (*CANOPEN_DRIVER_PROC)(s_BOARD *board);
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typedef int (*CANCLOSE_DRIVER_PROC)(void* inst);
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class driver_procs
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   {
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   public:
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      driver_procs();
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      ~driver_procs();
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      HMODULE load_canfestival_driver(LPCTSTR driver_name);
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      bool can_driver_valid() const;
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   public:
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      // can driver
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      CANRECEIVE_DRIVER_PROC m_canReceive;
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      CANSEND_DRIVER_PROC m_canSend;
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      CANOPEN_DRIVER_PROC m_canOpen;
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      CANCLOSE_DRIVER_PROC m_canClose;
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      // driver module habndle
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      HMODULE m_driver_handle;
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   };
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driver_procs::driver_procs() : m_canReceive(0),
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      m_canSend(0),
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      m_canOpen(0),
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      m_canClose(0),
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      m_driver_handle(0)
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   {}
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driver_procs::~driver_procs()
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   {
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   if (m_driver_handle)
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      ::FreeLibrary(m_driver_handle);
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   }
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bool driver_procs::can_driver_valid() const
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   {
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   return ((m_canReceive != NULL) &&
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           (m_canSend != NULL) &&
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           (m_canOpen != NULL) &&
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           (m_canClose != NULL));
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   }
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// GetProcAddress doesn't have an UNICODE version for NT
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#ifdef UNDER_CE
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  #define myTEXT(str) TEXT(str)
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#else
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  #define myTEXT(str) str
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#endif
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HMODULE driver_procs::load_canfestival_driver(LPCTSTR driver_name)
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   {
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   if (can_driver_valid())
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      return m_driver_handle;
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   m_driver_handle = ::LoadLibrary(driver_name);
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   if (m_driver_handle == NULL)
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      return NULL;
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   m_canReceive = (CANRECEIVE_DRIVER_PROC)::GetProcAddress(m_driver_handle, myTEXT("canReceive_driver"));
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   m_canSend = (CANSEND_DRIVER_PROC)::GetProcAddress(m_driver_handle, myTEXT("canSend_driver"));
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   m_canOpen = (CANOPEN_DRIVER_PROC)::GetProcAddress(m_driver_handle, myTEXT("canOpen_driver"));
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   m_canClose = (CANCLOSE_DRIVER_PROC)::GetProcAddress(m_driver_handle, myTEXT("canClose_driver"));
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   return can_driver_valid()?m_driver_handle:NULL;
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   }
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struct driver_data
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   {
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   CO_Data * d;
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   HANDLE receive_thread;
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   void* inst;
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   volatile bool continue_receive_thread;
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   };
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driver_procs s_driver_procs;
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LIB_HANDLE LoadCanDriver(char* driver_name)
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   {
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		return s_driver_procs.load_canfestival_driver((LPCTSTR)driver_name);
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   }
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UNS8 canReceive(CAN_PORT fd0, Message *m)
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   {
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   if (fd0 != NULL && s_driver_procs.m_canReceive != NULL)
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	   {
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		  driver_data* data = (driver_data*)fd0;
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		  return (*s_driver_procs.m_canReceive)(data->inst, m);
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	   }
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   return 1;
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   }
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void* canReceiveLoop(CAN_PORT fd0)
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   {
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   driver_data* data = (driver_data*)fd0;
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   Message m;
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   while (data->continue_receive_thread)
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      {
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      if (!canReceive(fd0, &m))
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         {
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         EnterMutex();
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         canDispatch(data->d, &m);
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         LeaveMutex();
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         }
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      else
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         {
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		 break;
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         ::Sleep(1);
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         }
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      }
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   return 0;
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   }
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/***************************************************************************/
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UNS8 canSend(CAN_PORT fd0, Message *m)
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   {
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   if (fd0 != NULL && s_driver_procs.m_canSend != NULL)
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      {
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      UNS8 res;
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      driver_data* data = (driver_data*)fd0;
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      res = (*s_driver_procs.m_canSend)(data->inst, m);      
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      if (res)
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         return 0;
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      }
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   return 1;
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   }
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/***************************************************************************/
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CAN_HANDLE canOpen(s_BOARD *board, CO_Data * d)
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   {
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   if (board != NULL && s_driver_procs.m_canOpen != NULL)
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      {
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      void* inst = (*s_driver_procs.m_canOpen)(board);
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      if (inst != NULL)
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         {
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         driver_data* data = new driver_data;
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         data->d = d;
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         data->inst = inst;
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         data->continue_receive_thread = true;
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         CreateReceiveTask(data, &data->receive_thread, &canReceiveLoop);
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	 EnterMutex();
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         d->canHandle = data;
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         LeaveMutex();
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         return data;
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         }
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      }
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   return NULL;
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   }
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/***************************************************************************/
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int canClose(CO_Data * d)
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   {
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   if (s_driver_procs.m_canClose != NULL)
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      {
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		  driver_data* data;
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		  EnterMutex();
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		  if(d->canHandle != NULL){
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			data = (driver_data*)d->canHandle;
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			d->canHandle = NULL;
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			data->continue_receive_thread = false;}
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		  LeaveMutex();
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		  WaitReceiveTaskEnd(&data->receive_thread);
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		  (*s_driver_procs.m_canClose)(data->inst);
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		  delete data;
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		  return 0;
145
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      }
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   return 0;
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   }
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150
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   211