126 lines
5.7 KiB
Ada
126 lines
5.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- G N A T . S E R I A L _ C O M M U N I C A T I O N S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2007-2009, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Serial communications package, implemented on Windows and GNU/Linux
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with Ada.Streams;
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with Interfaces.C;
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package GNAT.Serial_Communications is
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Serial_Error : exception;
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-- Raised when a communication problem occurs
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type Port_Name is new String;
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-- A serial com port name
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function Name (Number : Positive) return Port_Name;
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-- Returns a possible port name for the given legacy PC architecture serial
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-- port number (COM<number>: on Windows, ttyS<number-1> on Linux).
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-- Note that this function does not support other kinds of serial ports
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-- nor operating systems other than Windows and Linux. For all other
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-- cases, an explicit port name can be passed directly to Open.
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type Data_Rate is
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(B1200, B2400, B4800, B9600, B19200, B38400, B57600, B115200);
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-- Speed of the communication
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type Data_Bits is (CS8, CS7);
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-- Communication bits
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type Stop_Bits_Number is (One, Two);
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-- One or two stop bits
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type Parity_Check is (None, Even, Odd);
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-- Either no parity check or an even or odd parity
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type Serial_Port is new Ada.Streams.Root_Stream_Type with private;
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procedure Open
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(Port : out Serial_Port;
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Name : Port_Name);
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-- Open the given port name. Raises Serial_Error if the port cannot be
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-- opened.
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procedure Set
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(Port : Serial_Port;
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Rate : Data_Rate := B9600;
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Bits : Data_Bits := CS8;
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Stop_Bits : Stop_Bits_Number := One;
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Parity : Parity_Check := None;
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Block : Boolean := True;
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Timeout : Duration := 10.0);
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-- The communication port settings. If Block is set then a read call
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-- will wait for the whole buffer to be filed. If Block is not set then
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-- the given Timeout (in seconds) is used. Note that the timeout precision
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-- may be limited on some implementation (e.g. on GNU/Linux the maximum
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-- precision is a tenth of seconds).
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overriding procedure Read
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(Port : in out Serial_Port;
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Buffer : out Ada.Streams.Stream_Element_Array;
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Last : out Ada.Streams.Stream_Element_Offset);
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-- Read a set of bytes, put result into Buffer and set Last accordingly.
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-- Last is set to Buffer'First - 1 if no byte has been read, unless
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-- Buffer'First = Stream_Element_Offset'First, in which case the exception
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-- Constraint_Error is raised instead.
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overriding procedure Write
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(Port : in out Serial_Port;
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Buffer : Ada.Streams.Stream_Element_Array);
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-- Write buffer into the port
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procedure Close (Port : in out Serial_Port);
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-- Close port
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private
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type Port_Data;
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type Port_Data_Access is access Port_Data;
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type Serial_Port is new Ada.Streams.Root_Stream_Type with record
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H : Port_Data_Access;
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end record;
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Data_Rate_Value : constant array (Data_Rate) of Interfaces.C.unsigned :=
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(B1200 => 1_200,
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B2400 => 2_400,
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B4800 => 4_800,
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B9600 => 9_600,
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B19200 => 19_200,
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B38400 => 38_400,
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B57600 => 57_600,
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B115200 => 115_200);
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end GNAT.Serial_Communications;
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