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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 GNU/Linux implementation of this package
-
-with Ada.Streams; use Ada.Streams;
-with Ada; use Ada;
-with Ada.Unchecked_Deallocation;
-
-with System.CRTL; use System, System.CRTL;
-
-with GNAT.OS_Lib; use GNAT.OS_Lib;
-
-package body GNAT.Serial_Communications is
-
- use type Interfaces.C.unsigned;
-
- type Port_Data is new int;
-
- subtype unsigned is Interfaces.C.unsigned;
- subtype char is Interfaces.C.char;
- subtype unsigned_char is Interfaces.C.unsigned_char;
-
- function fcntl (fd : int; cmd : int; value : int) return int;
- pragma Import (C, fcntl, "fcntl");
-
- O_RDWR : constant := 8#02#;
- O_NOCTTY : constant := 8#0400#;
- O_NDELAY : constant := 8#04000#;
- FNDELAY : constant := O_NDELAY;
- F_SETFL : constant := 4;
- TCSANOW : constant := 0;
- TCIFLUSH : constant := 0;
- CLOCAL : constant := 8#04000#;
- CREAD : constant := 8#0200#;
- CSTOPB : constant := 8#0100#;
- CRTSCTS : constant := 8#020000000000#;
- PARENB : constant := 8#00400#;
- PARODD : constant := 8#01000#;
-
- -- c_cc indexes
-
- VTIME : constant := 5;
- VMIN : constant := 6;
-
- C_Data_Rate : constant array (Data_Rate) of unsigned :=
- (B1200 => 8#000011#,
- B2400 => 8#000013#,
- B4800 => 8#000014#,
- B9600 => 8#000015#,
- B19200 => 8#000016#,
- B38400 => 8#000017#,
- B57600 => 8#010001#,
- B115200 => 8#010002#);
-
- C_Bits : constant array (Data_Bits) of unsigned :=
- (CS7 => 8#040#, CS8 => 8#060#);
-
- C_Stop_Bits : constant array (Stop_Bits_Number) of unsigned :=
- (One => 0, Two => CSTOPB);
-
- C_Parity : constant array (Parity_Check) of unsigned :=
- (None => 0, Odd => PARENB or PARODD, Even => PARENB);
-
- procedure Raise_Error (Message : String; Error : Integer := Errno);
- pragma No_Return (Raise_Error);
-
- ----------
- -- Name --
- ----------
-
- function Name (Number : Positive) return Port_Name is
- N : constant Natural := Number - 1;
- N_Img : constant String := Natural'Image (N);
- begin
- return Port_Name ("/dev/ttyS" & 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;
- Res : int;
-
- begin
- if Port.H = null then
- Port.H := new Port_Data;
- end if;
-
- Port.H.all := Port_Data (open
- (C_Name (C_Name'First)'Address, int (O_RDWR + O_NOCTTY + O_NDELAY)));
-
- if Port.H.all = -1 then
- Raise_Error ("open: open failed");
- end if;
-
- -- By default we are in blocking mode
-
- Res := fcntl (int (Port.H.all), F_SETFL, 0);
-
- if Res = -1 then
- Raise_Error ("open: fcntl failed");
- end if;
- end Open;
-
- -----------------
- -- Raise_Error --
- -----------------
-
- procedure Raise_Error (Message : String; Error : Integer := Errno) is
- begin
- raise Serial_Error with Message & " (" & Integer'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
- Len : constant int := Buffer'Length;
- Res : int;
-
- begin
- if Port.H = null then
- Raise_Error ("read: port not opened", 0);
- end if;
-
- Res := read (Integer (Port.H.all), Buffer'Address, Len);
-
- if Res = -1 then
- Last := 0;
- Raise_Error ("read failed");
- else
- Last := Buffer'First + Stream_Element_Offset (Res) - 1;
- end if;
- 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
- type termios is record
- c_iflag : unsigned;
- c_oflag : unsigned;
- c_cflag : unsigned;
- c_lflag : unsigned;
- c_line : unsigned_char;
- c_cc : Interfaces.C.char_array (0 .. 31);
- c_ispeed : unsigned;
- c_ospeed : unsigned;
- end record;
- pragma Convention (C, termios);
-
- function tcgetattr (fd : int; termios_p : Address) return int;
- pragma Import (C, tcgetattr, "tcgetattr");
-
- function tcsetattr
- (fd : int; action : int; termios_p : Address) return int;
- pragma Import (C, tcsetattr, "tcsetattr");
-
- function tcflush (fd : int; queue_selector : int) return int;
- pragma Import (C, tcflush, "tcflush");
-
- Current : termios;
- Res : int;
-
- begin
- if Port.H = null then
- Raise_Error ("set: port not opened", 0);
- end if;
-
- -- Get current port settings
-
- Res := tcgetattr (int (Port.H.all), Current'Address);
-
- -- Change settings now
-
- Current.c_cflag := C_Data_Rate (Rate)
- or C_Bits (Bits)
- or C_Stop_Bits (Stop_Bits)
- or C_Parity (Parity)
- or CLOCAL
- or CREAD
- or CRTSCTS;
- Current.c_lflag := 0;
- Current.c_iflag := 0;
- Current.c_oflag := 0;
- Current.c_ispeed := Data_Rate_Value (Rate);
- Current.c_ospeed := Data_Rate_Value (Rate);
- Current.c_cc (VMIN) := char'Val (0);
- Current.c_cc (VTIME) := char'Val (Natural (Timeout * 10));
-
- -- Set port settings
-
- Res := tcflush (int (Port.H.all), TCIFLUSH);
- Res := tcsetattr (int (Port.H.all), TCSANOW, Current'Address);
-
- -- Block
-
- if Block then
- Res := fcntl (int (Port.H.all), F_SETFL, 0);
- else
- Res := fcntl (int (Port.H.all), F_SETFL, FNDELAY);
- end if;
-
- if Res = -1 then
- Raise_Error ("set: fcntl failed");
- end if;
- end Set;
-
- -----------
- -- Write --
- -----------
-
- overriding procedure Write
- (Port : in out Serial_Port;
- Buffer : Stream_Element_Array)
- is
- Len : constant int := Buffer'Length;
- Res : int;
-
- begin
- if Port.H = null then
- Raise_Error ("write: port not opened", 0);
- end if;
-
- Res := write (int (Port.H.all), Buffer'Address, Len);
- pragma Assert (Res = Len);
-
- if Res = -1 then
- Raise_Error ("write failed");
- end if;
- end Write;
-
- -----------
- -- Close --
- -----------
-
- procedure Close (Port : in out Serial_Port) is
- procedure Unchecked_Free is
- new Unchecked_Deallocation (Port_Data, Port_Data_Access);
-
- Res : int;
- pragma Unreferenced (Res);
-
- begin
- if Port.H /= null then
- Res := close (int (Port.H.all));
- Unchecked_Free (Port.H);
- end if;
- end Close;
-
-end GNAT.Serial_Communications;