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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) 2007-2009, 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; use System;
with System.Communication; use System.Communication;
with System.Win32; use System.Win32;
with System.Win32.Ext; use 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 := CreateFileA
(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 := Last_Index (Buffer'First, C.int (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;
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