pal.hpp

一个嵌入式系统的C代码

//*************************************************************************
//  MODULE : Pal - Program Abstraction Layer for the RCOS system          *
//  AUTHOR : Ron Chernich                                                 *
//  PURPOSE: Definition of a class to provide platform dependant services *
//           for timer interrupts, raw keyboard buffer access and low     *
//           level mouse events.                                          *
//  HISTORY:                                                              *
//   29-OCT-93  Created to make "Timer" more platform independant         *
//*************************************************************************

#ifndef _RCOS_PAL

  #include <stdlib.h>
  #include "rcos.hpp"

  #if defined(BC20) || defined(UNIX)
    #define FAR far
  #else
    #define FAR __far
  #endif

  //////////////////////////////////////
  // Protos for low level keyboard and timer services
  //
  BOOL   PalKeyReady (void);         // Return state of input keyboard buffer
  UINT16 PalGetKey (void);           // get next value from keyboard buffer
  UINT32 PalGetVec (UINT16);         // get (flat) vector to service routine
  void   PalSetVec (UINT16, UINT32); // replace vector of service interrupt
  UINT32 PalGetTime (void);          // get milliseconds since midnight
  void   PalInitClk (void);          // Setup for 1mS clock resolution
  void   PalResetClk (void);         // Restore original resolution


  ////////////////////
  // define constants for DOS based mouse functions..
  //
  #define MM_Driver     0x33            // Standard MS-DOS mouse interrupt
  #define MM_Reset      0x00            // Reset mouse driver
  #define MM_Show       0x01            // show mouse pointer
  #define MM_Hide       0x02            // Hide mouse cursor
  #define MM_SetH       0x07            // Set horizontal movement limits
  #define MM_SetV       0x08            // Set vertical movement limits
  #define MM_SetISR     0x0C            // Set user defined service routine
  #define MM_Smart      0x10            // Conditional cursor hide
  #define MM_MouseMove  0x01            // Mask for movement notification
  #define MM_LBdown     0x02            // Mask for left button pressed
  #define MM_LBup       0x04            // Mask for left button released

  /////////////
  // Protos for low level mouse services.. Notice the "Hide Pointer" routine
  // takes optional args.  If they default, just turn the begger off.  If
  // a rect region is given, use "smart" blanking; ie pointer turns off
  // only if it is in, or moves into the specified region.
  //
  BOOL PalMouseInit (void);             // Prepare mouse for use (if installed)
  void PalMouseReset (void);            // restore anything done by Init
  BOOL PalMouseEvent (INT16*, INT16*);  // get location of last click (if any)
  void PalMousePointerOn (void);        // display pointer
  void PalMousePointerOff (INT16 = -1, INT16 = -1, INT16 = -1, INT16 = -1);

  #define _RCOS_PAL
#endif

/********************************** eof **********************************/