File : g-io-put-leon.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- G N A T . I O . P U T --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2012, AdaCore --
10 -- --
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. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
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/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 -- LEON version of text output routine
33
34 with System;
35
36 separate (GNAT.IO)
37 procedure Put (C : Character) is
38 type Register is mod 2**32;
39
40 UART_Data : Register;
41 UART_Status : Register;
42 -- Comment these ???
43
44 for UART_Data'Address use System'To_Address (16#8000_0070#);
45 for UART_Status'Address use System'To_Address (16#8000_0074#);
46
47 pragma Volatile (UART_Data);
48 pragma Volatile (UART_Status);
49
50 begin
51 -- Need some comments of what is going on here ???
52
53 while (UART_Status and 4) = 0 loop
54 null;
55 end loop;
56
57 UART_Data := Character'Pos (C);
58 end Put;