gcc/ada/g-sercom-mingw.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --           G N A T . S E R I A L _ C O M M U N I C A T I O N S            --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                    Copyright (C) 2007-2008, AdaCore                      --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is the Windows implementation of this package
  35
  36 with Ada.Unchecked_Deallocation; use Ada;
  37 with Ada.Streams;                use Ada.Streams;
  38 with System.Win32.Ext;           use System, System.Win32, System.Win32.Ext;
  39
  40 package body GNAT.Serial_Communications is
  41
  42    --  Common types
  43
  44    type Port_Data is new HANDLE;
  45
  46    C_Bits      : constant array (Data_Bits) of Interfaces.C.unsigned := (8, 7);
  47    C_Parity    : constant array (Parity_Check) of Interfaces.C.unsigned :=
  48                    (None => NOPARITY, Odd => ODDPARITY, Even => EVENPARITY);
  49    C_Stop_Bits : constant array (Stop_Bits_Number) of Interfaces.C.unsigned :=
  50                    (One => ONESTOPBIT, Two => TWOSTOPBITS);
  51
  52    -----------
  53    -- Files --
  54    -----------
  55
  56    procedure Raise_Error (Message : String; Error : DWORD := GetLastError);
  57    pragma No_Return (Raise_Error);
  58
  59    -----------
  60    -- Close --
  61    -----------
  62
  63    procedure Close (Port : in out Serial_Port) is
  64       procedure Unchecked_Free is
  65         new Unchecked_Deallocation (Port_Data, Port_Data_Access);
  66
  67       Success : BOOL;
  68
  69    begin
  70       if Port.H /= null then
  71          Success := CloseHandle (HANDLE (Port.H.all));
  72          Unchecked_Free (Port.H);
  73
  74          if Success = Win32.FALSE then
  75             Raise_Error ("error closing the port");
  76          end if;
  77       end if;
  78    end Close;
  79
  80    ----------
  81    -- Name --
  82    ----------
  83
  84    function Name (Number : Positive) return Port_Name is
  85       N_Img : constant String := Positive'Image (Number);
  86    begin
  87       return Port_Name ("COM" & N_Img (N_Img'First + 1 .. N_Img'Last) & ':');
  88    end Name;
  89
  90    ----------
  91    -- Open --
  92    ----------
  93
  94    procedure Open
  95      (Port : out Serial_Port;
  96       Name : Port_Name)
  97    is
  98       C_Name  : constant String := String (Name) & ASCII.NUL;
  99       Success : BOOL;
 100       pragma Unreferenced (Success);
 101
 102    begin
 103       if Port.H = null then
 104          Port.H := new Port_Data;
 105       else
 106          Success := CloseHandle (HANDLE (Port.H.all));
 107       end if;
 108
 109       Port.H.all := CreateFile
 110         (lpFileName            => C_Name (C_Name'First)'Address,
 111          dwDesiredAccess       => GENERIC_READ or GENERIC_WRITE,
 112          dwShareMode           => 0,
 113          lpSecurityAttributes  => null,
 114          dwCreationDisposition => OPEN_EXISTING,
 115          dwFlagsAndAttributes  => 0,
 116          hTemplateFile         => 0);
 117
 118       if Port.H.all = 0 then
 119          Raise_Error ("cannot open com port");
 120       end if;
 121    end Open;
 122
 123    -----------------
 124    -- Raise_Error --
 125    -----------------
 126
 127    procedure Raise_Error (Message : String; Error : DWORD := GetLastError) is
 128    begin
 129       raise Serial_Error with Message & " (" & DWORD'Image (Error) & ')';
 130    end Raise_Error;
 131
 132    ----------
 133    -- Read --
 134    ----------
 135
 136    overriding procedure Read
 137      (Port   : in out Serial_Port;
 138       Buffer : out Stream_Element_Array;
 139       Last   : out Stream_Element_Offset)
 140    is
 141       Success   : BOOL;
 142       Read_Last : aliased DWORD;
 143
 144    begin
 145       if Port.H = null then
 146          Raise_Error ("read: port not opened", 0);
 147       end if;
 148
 149       Success :=
 150         ReadFile
 151           (hFile                => HANDLE (Port.H.all),
 152            lpBuffer             => Buffer (Buffer'First)'Address,
 153            nNumberOfBytesToRead => DWORD (Buffer'Length),
 154            lpNumberOfBytesRead  => Read_Last'Access,
 155            lpOverlapped         => null);
 156
 157       if Success = Win32.FALSE then
 158          Raise_Error ("read error");
 159       end if;
 160
 161       Last := Buffer'First - 1 + Stream_Element_Offset (Read_Last);
 162    end Read;
 163
 164    ---------
 165    -- Set --
 166    ---------
 167
 168    procedure Set
 169      (Port      : Serial_Port;
 170       Rate      : Data_Rate        := B9600;
 171       Bits      : Data_Bits        := B8;
 172       Stop_Bits : Stop_Bits_Number := One;
 173       Parity    : Parity_Check     := None;
 174       Block     : Boolean          := True;
 175       Timeout   : Duration         := 10.0)
 176    is
 177       Success      : BOOL;
 178       Com_Time_Out : aliased COMMTIMEOUTS;
 179       Com_Settings : aliased DCB;
 180
 181    begin
 182       if Port.H = null then
 183          Raise_Error ("set: port not opened", 0);
 184       end if;
 185
 186       Success := GetCommState (HANDLE (Port.H.all), Com_Settings'Access);
 187
 188       if Success = Win32.FALSE then
 189          Success := CloseHandle (HANDLE (Port.H.all));
 190          Port.H.all := 0;
 191          Raise_Error ("set: cannot get comm state");
 192       end if;
 193
 194       Com_Settings.BaudRate        := DWORD (Data_Rate_Value (Rate));
 195       Com_Settings.fParity         := 1;
 196       Com_Settings.fBinary         := Bits1 (System.Win32.TRUE);
 197       Com_Settings.fOutxCtsFlow    := 0;
 198       Com_Settings.fOutxDsrFlow    := 0;
 199       Com_Settings.fDsrSensitivity := 0;
 200       Com_Settings.fDtrControl     := DTR_CONTROL_DISABLE;
 201       Com_Settings.fOutX           := 0;
 202       Com_Settings.fInX            := 0;
 203       Com_Settings.fRtsControl     := RTS_CONTROL_DISABLE;
 204       Com_Settings.fAbortOnError   := 0;
 205       Com_Settings.ByteSize        := BYTE (C_Bits (Bits));
 206       Com_Settings.Parity          := BYTE (C_Parity (Parity));
 207       Com_Settings.StopBits        := BYTE (C_Stop_Bits (Stop_Bits));
 208
 209       Success := SetCommState (HANDLE (Port.H.all), Com_Settings'Access);
 210
 211       if Success = Win32.FALSE then
 212          Success := CloseHandle (HANDLE (Port.H.all));
 213          Port.H.all := 0;
 214          Raise_Error ("cannot set comm state");
 215       end if;
 216
 217       --  Set the timeout status
 218
 219       if Block then
 220          Com_Time_Out := (others => 0);
 221       else
 222          Com_Time_Out :=
 223            (ReadTotalTimeoutConstant => DWORD (1000 * Timeout),
 224             others                   => 0);
 225       end if;
 226
 227       Success :=
 228         SetCommTimeouts
 229           (hFile          => HANDLE (Port.H.all),
 230            lpCommTimeouts => Com_Time_Out'Access);
 231
 232       if Success = Win32.FALSE then
 233          Raise_Error ("cannot set the timeout");
 234       end if;
 235    end Set;
 236
 237    -----------
 238    -- Write --
 239    -----------
 240
 241    overriding procedure Write
 242      (Port   : in out Serial_Port;
 243       Buffer : Stream_Element_Array)
 244    is
 245       Success   : BOOL;
 246       Temp_Last : aliased DWORD;
 247
 248    begin
 249       if Port.H = null then
 250          Raise_Error ("write: port not opened", 0);
 251       end if;
 252
 253       Success :=
 254         WriteFile
 255           (hFile                  => HANDLE (Port.H.all),
 256            lpBuffer               => Buffer'Address,
 257            nNumberOfBytesToWrite  => DWORD (Buffer'Length),
 258            lpNumberOfBytesWritten => Temp_Last'Access,
 259            lpOverlapped           => null);
 260
 261       if Success = Win32.FALSE
 262         or else Stream_Element_Offset (Temp_Last) /= Buffer'Length
 263       then
 264          Raise_Error ("failed to write data");
 265       end if;
 266    end Write;
 267
 268 end GNAT.Serial_Communications;