g-sercom.ads 5.89 KB
Newer Older
1 2 3 4 5 6 7 8
------------------------------------------------------------------------------
--                                                                          --
--                         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            --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
Arnaud Charlet committed
9
--                    Copyright (C) 2007-2012, AdaCore                      --
10 11 12
--                                                                          --
-- 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- --
Arnaud Charlet committed
13
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14 15
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
Arnaud Charlet committed
16 17 18 19 20 21 22 23 24 25
-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
--                                                                          --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

--  Serial communications package, implemented on Windows and GNU/Linux

with Ada.Streams;
with Interfaces.C;

package GNAT.Serial_Communications is

   Serial_Error : exception;
   --  Raised when a communication problem occurs

   type Port_Name is new String;
   --  A serial com port name

   function Name (Number : Positive) return Port_Name;
46 47 48 49 50
   --  Returns a possible port name for the given legacy PC architecture serial
   --  port number (COM<number>: on Windows, ttyS<number-1> on Linux).
   --  Note that this function does not support other kinds of serial ports
   --  nor operating systems other than Windows and Linux. For all other
   --  cases, an explicit port name can be passed directly to Open.
51

52 53
   type Data_Rate is
     (B1200, B2400, B4800, B9600, B19200, B38400, B57600, B115200);
54 55
   --  Speed of the communication

56
   type Data_Bits is (CS8, CS7);
57 58
   --  Communication bits

59 60 61 62 63 64
   type Stop_Bits_Number is (One, Two);
   --  One or two stop bits

   type Parity_Check is (None, Even, Odd);
   --  Either no parity check or an even or odd parity

Arnaud Charlet committed
65 66 67
   type Flow_Control is (None, RTS_CTS, Xon_Xoff);
   --  No flow control, hardware flow control, software flow control

68 69 70 71 72 73 74 75 76
   type Serial_Port is new Ada.Streams.Root_Stream_Type with private;

   procedure Open
     (Port : out Serial_Port;
      Name : Port_Name);
   --  Open the given port name. Raises Serial_Error if the port cannot be
   --  opened.

   procedure Set
77 78
     (Port      : Serial_Port;
      Rate      : Data_Rate        := B9600;
79
      Bits      : Data_Bits        := CS8;
80 81 82
      Stop_Bits : Stop_Bits_Number := One;
      Parity    : Parity_Check     := None;
      Block     : Boolean          := True;
Arnaud Charlet committed
83 84
      Local     : Boolean          := True;
      Flow      : Flow_Control     := None;
85
      Timeout   : Duration         := 10.0);
86 87
   --  The communication port settings. If Block is set then a read call
   --  will wait for the whole buffer to be filed. If Block is not set then
Arnaud Charlet committed
88 89
   --  the given Timeout (in seconds) is used. If Local is set then modem
   --  control lines (in particular DCD) are ignored (not supported on
Arnaud Charlet committed
90 91
   --  Windows). Flow indicates the flow control type as defined above.
   --
Arnaud Charlet committed
92 93
   --  Note that the timeout precision may be limited on some implementation
   --  (e.g. on GNU/Linux the maximum precision is a tenth of seconds).
94 95 96 97 98 99

   overriding procedure Read
     (Port   : in out Serial_Port;
      Buffer : out Ada.Streams.Stream_Element_Array;
      Last   : out Ada.Streams.Stream_Element_Offset);
   --  Read a set of bytes, put result into Buffer and set Last accordingly.
100
   --  Last is set to Buffer'First - 1 if no byte has been read, unless
Arnaud Charlet committed
101 102
   --  Buffer'First = Stream_Element_Offset'First, in which case the exception
   --  Constraint_Error is raised instead.
103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121

   overriding procedure Write
     (Port   : in out Serial_Port;
      Buffer : Ada.Streams.Stream_Element_Array);
   --  Write buffer into the port

   procedure Close (Port : in out Serial_Port);
   --  Close port

private

   type Port_Data;
   type Port_Data_Access is access Port_Data;

   type Serial_Port is new Ada.Streams.Root_Stream_Type with record
      H : Port_Data_Access;
   end record;

   Data_Rate_Value : constant array (Data_Rate) of Interfaces.C.unsigned :=
122 123 124 125 126 127 128 129
                       (B1200   =>   1_200,
                        B2400   =>   2_400,
                        B4800   =>   4_800,
                        B9600   =>   9_600,
                        B19200  =>  19_200,
                        B38400  =>  38_400,
                        B57600  =>  57_600,
                        B115200 => 115_200);
130 131

end GNAT.Serial_Communications;