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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- G N A T . S E R I A L _ C O M M U N I C A T I O N S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2007-2008, AdaCore --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 2, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the Windows implementation of this package
+
+with Ada.Unchecked_Deallocation; use Ada;
+with Ada.Streams; use Ada.Streams;
+with System.Win32.Ext; use System, System.Win32, System.Win32.Ext;
+
+package body GNAT.Serial_Communications is
+
+ -- Common types
+
+ type Port_Data is new HANDLE;
+
+ C_Bits : constant array (Data_Bits) of Interfaces.C.unsigned := (8, 7);
+ C_Parity : constant array (Parity_Check) of Interfaces.C.unsigned :=
+ (None => NOPARITY, Odd => ODDPARITY, Even => EVENPARITY);
+ C_Stop_Bits : constant array (Stop_Bits_Number) of Interfaces.C.unsigned :=
+ (One => ONESTOPBIT, Two => TWOSTOPBITS);
+
+ -----------
+ -- Files --
+ -----------
+
+ procedure Raise_Error (Message : String; Error : DWORD := GetLastError);
+ pragma No_Return (Raise_Error);
+
+ -----------
+ -- Close --
+ -----------
+
+ procedure Close (Port : in out Serial_Port) is
+ procedure Unchecked_Free is
+ new Unchecked_Deallocation (Port_Data, Port_Data_Access);
+
+ Success : BOOL;
+
+ begin
+ if Port.H /= null then
+ Success := CloseHandle (HANDLE (Port.H.all));
+ Unchecked_Free (Port.H);
+
+ if Success = Win32.FALSE then
+ Raise_Error ("error closing the port");
+ end if;
+ end if;
+ end Close;
+
+ ----------
+ -- Name --
+ ----------
+
+ function Name (Number : Positive) return Port_Name is
+ N_Img : constant String := Positive'Image (Number);
+ begin
+ return Port_Name ("COM" & N_Img (N_Img'First + 1 .. N_Img'Last) & ':');
+ end Name;
+
+ ----------
+ -- Open --
+ ----------
+
+ procedure Open
+ (Port : out Serial_Port;
+ Name : Port_Name)
+ is
+ C_Name : constant String := String (Name) & ASCII.NUL;
+ Success : BOOL;
+ pragma Unreferenced (Success);
+
+ begin
+ if Port.H = null then
+ Port.H := new Port_Data;
+ else
+ Success := CloseHandle (HANDLE (Port.H.all));
+ end if;
+
+ Port.H.all := CreateFile
+ (lpFileName => C_Name (C_Name'First)'Address,
+ dwDesiredAccess => GENERIC_READ or GENERIC_WRITE,
+ dwShareMode => 0,
+ lpSecurityAttributes => null,
+ dwCreationDisposition => OPEN_EXISTING,
+ dwFlagsAndAttributes => 0,
+ hTemplateFile => 0);
+
+ if Port.H.all = 0 then
+ Raise_Error ("cannot open com port");
+ end if;
+ end Open;
+
+ -----------------
+ -- Raise_Error --
+ -----------------
+
+ procedure Raise_Error (Message : String; Error : DWORD := GetLastError) is
+ begin
+ raise Serial_Error with Message & " (" & DWORD'Image (Error) & ')';
+ end Raise_Error;
+
+ ----------
+ -- Read --
+ ----------
+
+ overriding procedure Read
+ (Port : in out Serial_Port;
+ Buffer : out Stream_Element_Array;
+ Last : out Stream_Element_Offset)
+ is
+ Success : BOOL;
+ Read_Last : aliased DWORD;
+
+ begin
+ if Port.H = null then
+ Raise_Error ("read: port not opened", 0);
+ end if;
+
+ Success :=
+ ReadFile
+ (hFile => HANDLE (Port.H.all),
+ lpBuffer => Buffer (Buffer'First)'Address,
+ nNumberOfBytesToRead => DWORD (Buffer'Length),
+ lpNumberOfBytesRead => Read_Last'Access,
+ lpOverlapped => null);
+
+ if Success = Win32.FALSE then
+ Raise_Error ("read error");
+ end if;
+
+ Last := Buffer'First - 1 + Stream_Element_Offset (Read_Last);
+ end Read;
+
+ ---------
+ -- Set --
+ ---------
+
+ procedure Set
+ (Port : Serial_Port;
+ Rate : Data_Rate := B9600;
+ Bits : Data_Bits := CS8;
+ Stop_Bits : Stop_Bits_Number := One;
+ Parity : Parity_Check := None;
+ Block : Boolean := True;
+ Timeout : Duration := 10.0)
+ is
+ Success : BOOL;
+ Com_Time_Out : aliased COMMTIMEOUTS;
+ Com_Settings : aliased DCB;
+
+ begin
+ if Port.H = null then
+ Raise_Error ("set: port not opened", 0);
+ end if;
+
+ Success := GetCommState (HANDLE (Port.H.all), Com_Settings'Access);
+
+ if Success = Win32.FALSE then
+ Success := CloseHandle (HANDLE (Port.H.all));
+ Port.H.all := 0;
+ Raise_Error ("set: cannot get comm state");
+ end if;
+
+ Com_Settings.BaudRate := DWORD (Data_Rate_Value (Rate));
+ Com_Settings.fParity := 1;
+ Com_Settings.fBinary := Bits1 (System.Win32.TRUE);
+ Com_Settings.fOutxCtsFlow := 0;
+ Com_Settings.fOutxDsrFlow := 0;
+ Com_Settings.fDsrSensitivity := 0;
+ Com_Settings.fDtrControl := DTR_CONTROL_DISABLE;
+ Com_Settings.fOutX := 0;
+ Com_Settings.fInX := 0;
+ Com_Settings.fRtsControl := RTS_CONTROL_DISABLE;
+ Com_Settings.fAbortOnError := 0;
+ Com_Settings.ByteSize := BYTE (C_Bits (Bits));
+ Com_Settings.Parity := BYTE (C_Parity (Parity));
+ Com_Settings.StopBits := BYTE (C_Stop_Bits (Stop_Bits));
+
+ Success := SetCommState (HANDLE (Port.H.all), Com_Settings'Access);
+
+ if Success = Win32.FALSE then
+ Success := CloseHandle (HANDLE (Port.H.all));
+ Port.H.all := 0;
+ Raise_Error ("cannot set comm state");
+ end if;
+
+ -- Set the timeout status
+
+ if Block then
+ Com_Time_Out := (others => 0);
+ else
+ Com_Time_Out :=
+ (ReadTotalTimeoutConstant => DWORD (1000 * Timeout),
+ others => 0);
+ end if;
+
+ Success :=
+ SetCommTimeouts
+ (hFile => HANDLE (Port.H.all),
+ lpCommTimeouts => Com_Time_Out'Access);
+
+ if Success = Win32.FALSE then
+ Raise_Error ("cannot set the timeout");
+ end if;
+ end Set;
+
+ -----------
+ -- Write --
+ -----------
+
+ overriding procedure Write
+ (Port : in out Serial_Port;
+ Buffer : Stream_Element_Array)
+ is
+ Success : BOOL;
+ Temp_Last : aliased DWORD;
+
+ begin
+ if Port.H = null then
+ Raise_Error ("write: port not opened", 0);
+ end if;
+
+ Success :=
+ WriteFile
+ (hFile => HANDLE (Port.H.all),
+ lpBuffer => Buffer'Address,
+ nNumberOfBytesToWrite => DWORD (Buffer'Length),
+ lpNumberOfBytesWritten => Temp_Last'Access,
+ lpOverlapped => null);
+
+ if Success = Win32.FALSE
+ or else Stream_Element_Offset (Temp_Last) /= Buffer'Length
+ then
+ Raise_Error ("failed to write data");
+ end if;
+ end Write;
+
+end GNAT.Serial_Communications;