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) 2007-2012, 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;
41 with System.OS_Constants;
43 with GNAT.OS_Lib; use GNAT.OS_Lib;
45 package body GNAT.Serial_Communications is
47 package OSC renames System.OS_Constants;
49 use type Interfaces.C.unsigned;
51 type Port_Data is new int;
53 subtype unsigned is Interfaces.C.unsigned;
54 subtype char is Interfaces.C.char;
55 subtype unsigned_char is Interfaces.C.unsigned_char;
57 function fcntl (fd : int; cmd : int; value : int) return int;
58 pragma Import (C, fcntl, "fcntl");
60 C_Data_Rate : constant array (Data_Rate) of unsigned :=
68 B115200 => OSC.B115200);
70 C_Bits : constant array (Data_Bits) of unsigned :=
71 (CS7 => OSC.CS7, CS8 => OSC.CS8);
73 C_Stop_Bits : constant array (Stop_Bits_Number) of unsigned :=
74 (One => 0, Two => OSC.CSTOPB);
76 C_Parity : constant array (Parity_Check) of unsigned :=
78 Odd => OSC.PARENB or OSC.PARODD,
81 procedure Raise_Error (Message : String; Error : Integer := Errno);
82 pragma No_Return (Raise_Error);
88 function Name (Number : Positive) return Port_Name is
89 N : constant Natural := Number - 1;
90 N_Img : constant String := Natural'Image (N);
92 return Port_Name ("/dev/ttyS" & N_Img (N_Img'First + 1 .. N_Img'Last));
100 (Port : out Serial_Port;
105 C_Name : constant String := String (Name) & ASCII.NUL;
109 if Port.H = null then
110 Port.H := new Port_Data;
113 Port.H.all := Port_Data (open
114 (C_Name (C_Name'First)'Address, int (O_RDWR + O_NOCTTY + O_NDELAY)));
116 if Port.H.all = -1 then
117 Raise_Error ("open: open failed");
120 -- By default we are in blocking mode
122 Res := fcntl (int (Port.H.all), F_SETFL, 0);
125 Raise_Error ("open: fcntl failed");
133 procedure Raise_Error (Message : String; Error : Integer := Errno) is
135 raise Serial_Error with Message & " (" & Integer'Image (Error) & ')';
142 overriding procedure Read
143 (Port : in out Serial_Port;
144 Buffer : out Stream_Element_Array;
145 Last : out Stream_Element_Offset)
147 Len : constant size_t := Buffer'Length;
151 if Port.H = null then
152 Raise_Error ("read: port not opened", 0);
155 Res := read (Integer (Port.H.all), Buffer'Address, Len);
158 Raise_Error ("read failed");
161 Last := Last_Index (Buffer'First, size_t (Res));
170 Rate : Data_Rate := B9600;
171 Bits : Data_Bits := CS8;
172 Stop_Bits : Stop_Bits_Number := One;
173 Parity : Parity_Check := None;
174 Block : Boolean := True;
175 Local : Boolean := True;
176 Flow : Flow_Control := None;
177 Timeout : Duration := 10.0)
181 type termios is record
186 c_line : unsigned_char;
187 c_cc : Interfaces.C.char_array (0 .. 31);
191 pragma Convention (C, termios);
193 function tcgetattr (fd : int; termios_p : Address) return int;
194 pragma Import (C, tcgetattr, "tcgetattr");
197 (fd : int; action : int; termios_p : Address) return int;
198 pragma Import (C, tcsetattr, "tcsetattr");
200 function tcflush (fd : int; queue_selector : int) return int;
201 pragma Import (C, tcflush, "tcflush");
206 pragma Warnings (Off, Res);
207 -- Warnings off, since we don't always test the result
210 if Port.H = null then
211 Raise_Error ("set: port not opened", 0);
214 -- Get current port settings
216 Res := tcgetattr (int (Port.H.all), Current'Address);
218 -- Change settings now
220 Current.c_cflag := C_Data_Rate (Rate)
222 or C_Stop_Bits (Stop_Bits)
225 Current.c_iflag := 0;
226 Current.c_lflag := 0;
227 Current.c_oflag := 0;
230 Current.c_cflag := Current.c_cflag or CLOCAL;
237 Current.c_cflag := Current.c_cflag or CRTSCTS;
239 Current.c_iflag := Current.c_iflag or IXON;
242 Current.c_ispeed := Data_Rate_Value (Rate);
243 Current.c_ospeed := Data_Rate_Value (Rate);
244 Current.c_cc (VMIN) := char'Val (0);
245 Current.c_cc (VTIME) := char'Val (Natural (Timeout * 10));
249 Res := tcflush (int (Port.H.all), TCIFLUSH);
250 Res := tcsetattr (int (Port.H.all), TCSANOW, Current'Address);
254 Res := fcntl (int (Port.H.all), F_SETFL, (if Block then 0 else FNDELAY));
257 Raise_Error ("set: fcntl failed");
265 overriding procedure Write
266 (Port : in out Serial_Port;
267 Buffer : Stream_Element_Array)
269 Len : constant size_t := Buffer'Length;
273 if Port.H = null then
274 Raise_Error ("write: port not opened", 0);
277 Res := write (int (Port.H.all), Buffer'Address, Len);
280 Raise_Error ("write failed");
283 pragma Assert (size_t (Res) = Len);
290 procedure Close (Port : in out Serial_Port) is
291 procedure Unchecked_Free is
292 new Unchecked_Deallocation (Port_Data, Port_Data_Access);
295 pragma Unreferenced (Res);
298 if Port.H /= null then
299 Res := close (int (Port.H.all));
300 Unchecked_Free (Port.H);
304 end GNAT.Serial_Communications;