1 /**
2 * \file
3 *
4 * \brief SAM Serial Peripheral Interface Driver
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 #include "sercom_interrupt.h"
47
48 void *_sercom_instances[SERCOM_INST_NUM];
49
50 /** Save status of initialized handlers */
51 static bool _handler_table_initialized = false;
52
53 /** Void pointers for saving device instance structures */
54 static void (*_sercom_interrupt_handlers[SERCOM_INST_NUM])(const uint8_t instance);
55
56 /**
57 * \internal
58 * Default interrupt handler.
59 *
60 * \param[in] instance SERCOM instance used.
61 */
_sercom_default_handler(const uint8_t instance)62 static void _sercom_default_handler(
63 const uint8_t instance)
64 {
65 Assert(false);
66 }
67
68 /**
69 * \internal
70 * Saves the given callback handler.
71 *
72 * \param[in] instance Instance index.
73 * \param[in] interrupt_handler Pointer to instance callback handler.
74 */
_sercom_set_handler(const uint8_t instance,const sercom_handler_t interrupt_handler)75 void _sercom_set_handler(
76 const uint8_t instance,
77 const sercom_handler_t interrupt_handler)
78 {
79 /* Initialize handlers with default handler and device instances with 0 */
80 if (_handler_table_initialized == false) {
81 for (uint32_t i = 0; i < SERCOM_INST_NUM; i++) {
82 _sercom_interrupt_handlers[i] = &_sercom_default_handler;
83 _sercom_instances[i] = NULL;
84 }
85
86 _handler_table_initialized = true;
87 }
88
89 /* Save interrupt handler */
90 _sercom_interrupt_handlers[instance] = interrupt_handler;
91 }
92
93
94 /** \internal
95 * Converts a given SERCOM index to its interrupt vector index.
96 */
97 #define _SERCOM_INTERRUPT_VECT_NUM(n, unused) \
98 SYSTEM_INTERRUPT_MODULE_SERCOM##n,
99
100 /** \internal
101 * Generates a SERCOM interrupt handler function for a given SERCOM index.
102 */
103 #define _SERCOM_INTERRUPT_HANDLER(n, unused) \
104 void SERCOM##n##_Handler(void) \
105 { \
106 _sercom_interrupt_handlers[n](n); \
107 }
108
109 /**
110 * \internal
111 * Returns the system interrupt vector.
112 *
113 * \param[in] sercom_instance Instance pointer
114 *
115 * \return Enum of system interrupt vector
116 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM0
117 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM1
118 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM2
119 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM3
120 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM4
121 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM5
122 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM6
123 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM7
124 */
_sercom_get_interrupt_vector(Sercom * const sercom_instance)125 enum system_interrupt_vector _sercom_get_interrupt_vector(
126 Sercom *const sercom_instance)
127 {
128 const uint8_t sercom_int_vectors[SERCOM_INST_NUM] =
129 {
130 MREPEAT(SERCOM_INST_NUM, _SERCOM_INTERRUPT_VECT_NUM, ~)
131 };
132
133 /* Retrieve the index of the SERCOM being requested */
134 uint8_t instance_index = _sercom_get_sercom_inst_index(sercom_instance);
135
136 /* Get the vector number from the lookup table for the requested SERCOM */
137 return (enum system_interrupt_vector)sercom_int_vectors[instance_index];
138 }
139
140 /** Auto-generate a set of interrupt handlers for each SERCOM in the device */
141 MREPEAT(SERCOM_INST_NUM, _SERCOM_INTERRUPT_HANDLER, ~)
142