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) 2007-2010, 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 3, 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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This is the GNU/Linux implementation of this package
34 with Ada.Streams; use Ada.Streams;
36 with Ada.Unchecked_Deallocation;
38 with System; use System;
39 with System.Communication; use System.Communication;
40 with System.CRTL; use System.CRTL;
42 with GNAT.OS_Lib; use GNAT.OS_Lib;
44 package body GNAT.Serial_Communications is
46 use type Interfaces.C.unsigned;
48 type Port_Data is new int;
50 subtype unsigned is Interfaces.C.unsigned;
51 subtype char is Interfaces.C.char;
52 subtype unsigned_char is Interfaces.C.unsigned_char;
54 function fcntl (fd : int; cmd : int; value : int) return int;
55 pragma Import (C, fcntl, "fcntl");
57 O_RDWR : constant := 8#02#;
58 O_NOCTTY : constant := 8#0400#;
59 O_NDELAY : constant := 8#04000#;
60 FNDELAY : constant := O_NDELAY;
61 F_SETFL : constant := 4;
62 TCSANOW : constant := 0;
63 TCIFLUSH : constant := 0;
64 CLOCAL : constant := 8#04000#;
65 CREAD : constant := 8#0200#;
66 CSTOPB : constant := 8#0100#;
67 CRTSCTS : constant := 8#020000000000#;
68 PARENB : constant := 8#00400#;
69 PARODD : constant := 8#01000#;
73 VTIME : constant := 5;
76 C_Data_Rate : constant array (Data_Rate) of unsigned :=
84 B115200 => 8#010002#);
86 C_Bits : constant array (Data_Bits) of unsigned :=
87 (CS7 => 8#040#, CS8 => 8#060#);
89 C_Stop_Bits : constant array (Stop_Bits_Number) of unsigned :=
90 (One => 0, Two => CSTOPB);
92 C_Parity : constant array (Parity_Check) of unsigned :=
93 (None => 0, Odd => PARENB or PARODD, Even => PARENB);
95 procedure Raise_Error (Message : String; Error : Integer := Errno);
96 pragma No_Return (Raise_Error);
102 function Name (Number : Positive) return Port_Name is
103 N : constant Natural := Number - 1;
104 N_Img : constant String := Natural'Image (N);
106 return Port_Name ("/dev/ttyS" & N_Img (N_Img'First + 1 .. N_Img'Last));
114 (Port : out Serial_Port;
117 C_Name : constant String := String (Name) & ASCII.NUL;
121 if Port.H = null then
122 Port.H := new Port_Data;
125 Port.H.all := Port_Data (open
126 (C_Name (C_Name'First)'Address, int (O_RDWR + O_NOCTTY + O_NDELAY)));
128 if Port.H.all = -1 then
129 Raise_Error ("open: open failed");
132 -- By default we are in blocking mode
134 Res := fcntl (int (Port.H.all), F_SETFL, 0);
137 Raise_Error ("open: fcntl failed");
145 procedure Raise_Error (Message : String; Error : Integer := Errno) is
147 raise Serial_Error with Message & " (" & Integer'Image (Error) & ')';
154 overriding procedure Read
155 (Port : in out Serial_Port;
156 Buffer : out Stream_Element_Array;
157 Last : out Stream_Element_Offset)
159 Len : constant size_t := Buffer'Length;
163 if Port.H = null then
164 Raise_Error ("read: port not opened", 0);
167 Res := read (Integer (Port.H.all), Buffer'Address, Len);
170 Raise_Error ("read failed");
173 Last := Last_Index (Buffer'First, size_t (Res));
182 Rate : Data_Rate := B9600;
183 Bits : Data_Bits := CS8;
184 Stop_Bits : Stop_Bits_Number := One;
185 Parity : Parity_Check := None;
186 Block : Boolean := True;
187 Timeout : Duration := 10.0)
189 type termios is record
194 c_line : unsigned_char;
195 c_cc : Interfaces.C.char_array (0 .. 31);
199 pragma Convention (C, termios);
201 function tcgetattr (fd : int; termios_p : Address) return int;
202 pragma Import (C, tcgetattr, "tcgetattr");
205 (fd : int; action : int; termios_p : Address) return int;
206 pragma Import (C, tcsetattr, "tcsetattr");
208 function tcflush (fd : int; queue_selector : int) return int;
209 pragma Import (C, tcflush, "tcflush");
214 pragma Warnings (Off, Res);
215 -- Warnings off, since we don't always test the result
218 if Port.H = null then
219 Raise_Error ("set: port not opened", 0);
222 -- Get current port settings
224 Res := tcgetattr (int (Port.H.all), Current'Address);
226 -- Change settings now
228 Current.c_cflag := C_Data_Rate (Rate)
230 or C_Stop_Bits (Stop_Bits)
235 Current.c_lflag := 0;
236 Current.c_iflag := 0;
237 Current.c_oflag := 0;
238 Current.c_ispeed := Data_Rate_Value (Rate);
239 Current.c_ospeed := Data_Rate_Value (Rate);
240 Current.c_cc (VMIN) := char'Val (0);
241 Current.c_cc (VTIME) := char'Val (Natural (Timeout * 10));
245 Res := tcflush (int (Port.H.all), TCIFLUSH);
246 Res := tcsetattr (int (Port.H.all), TCSANOW, Current'Address);
250 Res := fcntl (int (Port.H.all), F_SETFL, (if Block then 0 else FNDELAY));
253 Raise_Error ("set: fcntl failed");
261 overriding procedure Write
262 (Port : in out Serial_Port;
263 Buffer : Stream_Element_Array)
265 Len : constant size_t := Buffer'Length;
269 if Port.H = null then
270 Raise_Error ("write: port not opened", 0);
273 Res := write (int (Port.H.all), Buffer'Address, Len);
276 Raise_Error ("write failed");
279 pragma Assert (size_t (Res) = Len);
286 procedure Close (Port : in out Serial_Port) is
287 procedure Unchecked_Free is
288 new Unchecked_Deallocation (Port_Data, Port_Data_Access);
291 pragma Unreferenced (Res);
294 if Port.H /= null then
295 Res := close (int (Port.H.all));
296 Unchecked_Free (Port.H);
300 end GNAT.Serial_Communications;