1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
------------------------------------------------------------------------------
-- --
-- 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) 2007-2010, 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 3, 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. --
-- --
-- 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is the Windows implementation of this package
with Ada.Unchecked_Deallocation; use Ada;
with Ada.Streams; use Ada.Streams;
with System; use System;
with System.Communication; use System.Communication;
with System.CRTL; use System.CRTL;
with System.Win32; use System.Win32;
with System.Win32.Ext; use System.Win32.Ext;
package body GNAT.Serial_Communications is
-- Common types
type Port_Data is new HANDLE;
C_Bits : constant array (Data_Bits) of Interfaces.C.unsigned := (8, 7);
C_Parity : constant array (Parity_Check) of Interfaces.C.unsigned :=
(None => NOPARITY, Odd => ODDPARITY, Even => EVENPARITY);
C_Stop_Bits : constant array (Stop_Bits_Number) of Interfaces.C.unsigned :=
(One => ONESTOPBIT, Two => TWOSTOPBITS);
-----------
-- Files --
-----------
procedure Raise_Error (Message : String; Error : DWORD := GetLastError);
pragma No_Return (Raise_Error);
-----------
-- Close --
-----------
procedure Close (Port : in out Serial_Port) is
procedure Unchecked_Free is
new Unchecked_Deallocation (Port_Data, Port_Data_Access);
Success : BOOL;
begin
if Port.H /= null then
Success := CloseHandle (HANDLE (Port.H.all));
Unchecked_Free (Port.H);
if Success = Win32.FALSE then
Raise_Error ("error closing the port");
end if;
end if;
end Close;
----------
-- Name --
----------
function Name (Number : Positive) return Port_Name is
N_Img : constant String := Positive'Image (Number);
begin
return Port_Name ("COM" & 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;
Success : BOOL;
pragma Unreferenced (Success);
begin
if Port.H = null then
Port.H := new Port_Data;
else
Success := CloseHandle (HANDLE (Port.H.all));
end if;
Port.H.all := CreateFileA
(lpFileName => C_Name (C_Name'First)'Address,
dwDesiredAccess => GENERIC_READ or GENERIC_WRITE,
dwShareMode => 0,
lpSecurityAttributes => null,
dwCreationDisposition => OPEN_EXISTING,
dwFlagsAndAttributes => 0,
hTemplateFile => 0);
if Port.H.all = 0 then
Raise_Error ("cannot open com port");
end if;
end Open;
-----------------
-- Raise_Error --
-----------------
procedure Raise_Error (Message : String; Error : DWORD := GetLastError) is
begin
raise Serial_Error with Message & " (" & DWORD'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
Success : BOOL;
Read_Last : aliased DWORD;
begin
if Port.H = null then
Raise_Error ("read: port not opened", 0);
end if;
Success :=
ReadFile
(hFile => HANDLE (Port.H.all),
lpBuffer => Buffer (Buffer'First)'Address,
nNumberOfBytesToRead => DWORD (Buffer'Length),
lpNumberOfBytesRead => Read_Last'Access,
lpOverlapped => null);
if Success = Win32.FALSE then
Raise_Error ("read error");
end if;
Last := Last_Index (Buffer'First, size_t (Read_Last));
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
Success : BOOL;
Com_Time_Out : aliased COMMTIMEOUTS;
Com_Settings : aliased DCB;
begin
if Port.H = null then
Raise_Error ("set: port not opened", 0);
end if;
Success := GetCommState (HANDLE (Port.H.all), Com_Settings'Access);
if Success = Win32.FALSE then
Success := CloseHandle (HANDLE (Port.H.all));
Port.H.all := 0;
Raise_Error ("set: cannot get comm state");
end if;
Com_Settings.BaudRate := DWORD (Data_Rate_Value (Rate));
Com_Settings.fParity := 1;
Com_Settings.fBinary := Bits1 (System.Win32.TRUE);
Com_Settings.fOutxCtsFlow := 0;
Com_Settings.fOutxDsrFlow := 0;
Com_Settings.fDsrSensitivity := 0;
Com_Settings.fDtrControl := DTR_CONTROL_DISABLE;
Com_Settings.fOutX := 0;
Com_Settings.fInX := 0;
Com_Settings.fRtsControl := RTS_CONTROL_DISABLE;
Com_Settings.fAbortOnError := 0;
Com_Settings.ByteSize := BYTE (C_Bits (Bits));
Com_Settings.Parity := BYTE (C_Parity (Parity));
Com_Settings.StopBits := BYTE (C_Stop_Bits (Stop_Bits));
Success := SetCommState (HANDLE (Port.H.all), Com_Settings'Access);
if Success = Win32.FALSE then
Success := CloseHandle (HANDLE (Port.H.all));
Port.H.all := 0;
Raise_Error ("cannot set comm state");
end if;
-- Set the timeout status
if Block then
Com_Time_Out := (others => 0);
else
Com_Time_Out :=
(ReadTotalTimeoutConstant => DWORD (1000 * Timeout),
others => 0);
end if;
Success :=
SetCommTimeouts
(hFile => HANDLE (Port.H.all),
lpCommTimeouts => Com_Time_Out'Access);
if Success = Win32.FALSE then
Raise_Error ("cannot set the timeout");
end if;
end Set;
-----------
-- Write --
-----------
overriding procedure Write
(Port : in out Serial_Port;
Buffer : Stream_Element_Array)
is
Success : BOOL;
Temp_Last : aliased DWORD;
begin
if Port.H = null then
Raise_Error ("write: port not opened", 0);
end if;
Success :=
WriteFile
(hFile => HANDLE (Port.H.all),
lpBuffer => Buffer'Address,
nNumberOfBytesToWrite => DWORD (Buffer'Length),
lpNumberOfBytesWritten => Temp_Last'Access,
lpOverlapped => null);
if Success = Win32.FALSE
or else Stream_Element_Offset (Temp_Last) /= Buffer'Length
then
Raise_Error ("failed to write data");
end if;
end Write;
end GNAT.Serial_Communications;
|
