1 /**
2 * \file
3 *
4 * \brief SAM System related functionality
5 *
6 * Copyright (C) 2012-2015 Atmel Corporation. All rights reserved.
7 *
8 * \asf_license_start
9 *
10 * \page License
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright notice,
16 * this list of conditions and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright notice,
19 * this list of conditions and the following disclaimer in the documentation
20 * and/or other materials provided with the distribution.
21 *
22 * 3. The name of Atmel may not be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * 4. This software may only be redistributed and used in connection with an
26 * Atmel microcontroller product.
27 *
28 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
29 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
31 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
32 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
36 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 *
40 * \asf_license_stop
41 *
42 */
43 /*
44 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
45 */
46
47 #include <system.h>
48
49 /**
50 * \internal
51 * Dummy initialization function, used as a weak alias target for the various
52 * init functions called by \ref system_init().
53 */
54 void _system_dummy_init(void);
_system_dummy_init(void)55 void _system_dummy_init(void)
56 {
57 return;
58 }
59
60 #if !defined(__DOXYGEN__)
61 # if defined(__GNUC__) || defined(__CC_ARM)
62 void system_clock_init(void) WEAK __attribute__((alias("_system_dummy_init")));
63 void system_board_init(void) WEAK __attribute__((alias("_system_dummy_init")));
64 void _system_events_init(void) WEAK __attribute__((alias("_system_dummy_init")));
65 void _system_extint_init(void) WEAK __attribute__((alias("_system_dummy_init")));
66 void _system_divas_init(void) WEAK __attribute__((alias("_system_dummy_init")));
67 # elif defined(__ICCARM__)
68 void system_clock_init(void);
69 void system_board_init(void);
70 void _system_events_init(void);
71 void _system_extint_init(void);
72 void _system_divas_init(void);
73 # pragma weak system_clock_init=_system_dummy_init
74 # pragma weak system_board_init=_system_dummy_init
75 # pragma weak _system_events_init=_system_dummy_init
76 # pragma weak _system_extint_init=_system_dummy_init
77 # pragma weak _system_divas_init=_system_dummy_init
78 # endif
79 #endif
80
81 /**
82 * \brief Initialize system
83 *
84 * This function will call the various initialization functions within the
85 * system namespace. If a given optional system module is not available, the
86 * associated call will effectively be a NOP (No Operation).
87 *
88 * Currently the following initialization functions are supported:
89 * - System clock initialization (via the SYSTEM CLOCK sub-module)
90 * - Board hardware initialization (via the Board module)
91 * - Event system driver initialization (via the EVSYS module)
92 * - External Interrupt driver initialization (via the EXTINT module)
93 */
system_init(void)94 void system_init(void)
95 {
96 /* Configure GCLK and clock sources according to conf_clocks.h */
97 system_clock_init();
98
99 /* Initialize board hardware */
100 system_board_init();
101
102 /* Initialize EVSYS hardware */
103 _system_events_init();
104
105 /* Initialize External hardware */
106 _system_extint_init();
107
108 /* Initialize DIVAS hardware */
109 _system_divas_init();
110 }
111
112