1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
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 --
9 -- Copyright (C) 2007-2009, AdaCore --
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. --
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. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the Windows implementation of this package
36 with Ada.Unchecked_Deallocation; use Ada;
37 with Ada.Streams; use Ada.Streams;
39 with System; use System;
40 with System.Communication; use System.Communication;
41 with System.Win32; use System.Win32;
42 with System.Win32.Ext; use System.Win32.Ext;
44 package body GNAT.Serial_Communications is
48 type Port_Data is new HANDLE;
50 C_Bits : constant array (Data_Bits) of Interfaces.C.unsigned := (8, 7);
51 C_Parity : constant array (Parity_Check) of Interfaces.C.unsigned :=
52 (None => NOPARITY, Odd => ODDPARITY, Even => EVENPARITY);
53 C_Stop_Bits : constant array (Stop_Bits_Number) of Interfaces.C.unsigned :=
54 (One => ONESTOPBIT, Two => TWOSTOPBITS);
60 procedure Raise_Error (Message : String; Error : DWORD := GetLastError);
61 pragma No_Return (Raise_Error);
67 procedure Close (Port : in out Serial_Port) is
68 procedure Unchecked_Free is
69 new Unchecked_Deallocation (Port_Data, Port_Data_Access);
74 if Port.H /= null then
75 Success := CloseHandle (HANDLE (Port.H.all));
76 Unchecked_Free (Port.H);
78 if Success = Win32.FALSE then
79 Raise_Error ("error closing the port");
88 function Name (Number : Positive) return Port_Name is
89 N_Img : constant String := Positive'Image (Number);
91 return Port_Name ("COM" & N_Img (N_Img'First + 1 .. N_Img'Last) & ':');
99 (Port : out Serial_Port;
102 C_Name : constant String := String (Name) & ASCII.NUL;
104 pragma Unreferenced (Success);
107 if Port.H = null then
108 Port.H := new Port_Data;
110 Success := CloseHandle (HANDLE (Port.H.all));
113 Port.H.all := CreateFileA
114 (lpFileName => C_Name (C_Name'First)'Address,
115 dwDesiredAccess => GENERIC_READ or GENERIC_WRITE,
117 lpSecurityAttributes => null,
118 dwCreationDisposition => OPEN_EXISTING,
119 dwFlagsAndAttributes => 0,
122 if Port.H.all = 0 then
123 Raise_Error ("cannot open com port");
131 procedure Raise_Error (Message : String; Error : DWORD := GetLastError) is
133 raise Serial_Error with Message & " (" & DWORD'Image (Error) & ')';
140 overriding procedure Read
141 (Port : in out Serial_Port;
142 Buffer : out Stream_Element_Array;
143 Last : out Stream_Element_Offset)
146 Read_Last : aliased DWORD;
149 if Port.H = null then
150 Raise_Error ("read: port not opened", 0);
155 (hFile => HANDLE (Port.H.all),
156 lpBuffer => Buffer (Buffer'First)'Address,
157 nNumberOfBytesToRead => DWORD (Buffer'Length),
158 lpNumberOfBytesRead => Read_Last'Access,
159 lpOverlapped => null);
161 if Success = Win32.FALSE then
162 Raise_Error ("read error");
165 Last := Last_Index (Buffer'First, C.int (Read_Last));
174 Rate : Data_Rate := B9600;
175 Bits : Data_Bits := CS8;
176 Stop_Bits : Stop_Bits_Number := One;
177 Parity : Parity_Check := None;
178 Block : Boolean := True;
179 Timeout : Duration := 10.0)
182 Com_Time_Out : aliased COMMTIMEOUTS;
183 Com_Settings : aliased DCB;
186 if Port.H = null then
187 Raise_Error ("set: port not opened", 0);
190 Success := GetCommState (HANDLE (Port.H.all), Com_Settings'Access);
192 if Success = Win32.FALSE then
193 Success := CloseHandle (HANDLE (Port.H.all));
195 Raise_Error ("set: cannot get comm state");
198 Com_Settings.BaudRate := DWORD (Data_Rate_Value (Rate));
199 Com_Settings.fParity := 1;
200 Com_Settings.fBinary := Bits1 (System.Win32.TRUE);
201 Com_Settings.fOutxCtsFlow := 0;
202 Com_Settings.fOutxDsrFlow := 0;
203 Com_Settings.fDsrSensitivity := 0;
204 Com_Settings.fDtrControl := DTR_CONTROL_DISABLE;
205 Com_Settings.fOutX := 0;
206 Com_Settings.fInX := 0;
207 Com_Settings.fRtsControl := RTS_CONTROL_DISABLE;
208 Com_Settings.fAbortOnError := 0;
209 Com_Settings.ByteSize := BYTE (C_Bits (Bits));
210 Com_Settings.Parity := BYTE (C_Parity (Parity));
211 Com_Settings.StopBits := BYTE (C_Stop_Bits (Stop_Bits));
213 Success := SetCommState (HANDLE (Port.H.all), Com_Settings'Access);
215 if Success = Win32.FALSE then
216 Success := CloseHandle (HANDLE (Port.H.all));
218 Raise_Error ("cannot set comm state");
221 -- Set the timeout status
224 Com_Time_Out := (others => 0);
227 (ReadTotalTimeoutConstant => DWORD (1000 * Timeout),
233 (hFile => HANDLE (Port.H.all),
234 lpCommTimeouts => Com_Time_Out'Access);
236 if Success = Win32.FALSE then
237 Raise_Error ("cannot set the timeout");
245 overriding procedure Write
246 (Port : in out Serial_Port;
247 Buffer : Stream_Element_Array)
250 Temp_Last : aliased DWORD;
253 if Port.H = null then
254 Raise_Error ("write: port not opened", 0);
259 (hFile => HANDLE (Port.H.all),
260 lpBuffer => Buffer'Address,
261 nNumberOfBytesToWrite => DWORD (Buffer'Length),
262 lpNumberOfBytesWritten => Temp_Last'Access,
263 lpOverlapped => null);
265 if Success = Win32.FALSE
266 or else Stream_Element_Offset (Temp_Last) /= Buffer'Length
268 Raise_Error ("failed to write data");
272 end GNAT.Serial_Communications;