4 * \brief SAM D20 Serial Peripheral Interface Driver
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6 * Copyright (C) 2012-2013 Atmel Corporation. All rights reserved.
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12 * Redistribution and use in source and binary forms, with or without
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13 * modification, are permitted provided that the following conditions are met:
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15 * 1. Redistributions of source code must retain the above copyright notice,
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16 * this list of conditions and the following disclaimer.
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18 * 2. Redistributions in binary form must reproduce the above copyright notice,
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19 * this list of conditions and the following disclaimer in the documentation
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20 * and/or other materials provided with the distribution.
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22 * 3. The name of Atmel may not be used to endorse or promote products derived
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23 * from this software without specific prior written permission.
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25 * 4. This software may only be redistributed and used in connection with an
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26 * Atmel microcontroller product.
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28 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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29 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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31 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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32 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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36 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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38 * POSSIBILITY OF SUCH DAMAGE.
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43 #include "sercom_interrupt.h"
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45 void *_sercom_instances[SERCOM_INST_NUM];
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47 /** Save status of initialized handlers. */
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48 static bool _handler_table_initialized = false;
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50 /** Void pointers for saving device instance structures. */
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51 static void (*_sercom_interrupt_handlers[SERCOM_INST_NUM])(const uint8_t instance);
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55 * Default interrupt handler.
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57 * \param[in] instance SERCOM instance used.
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59 static void _sercom_default_handler(
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60 const uint8_t instance)
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68 * Find index of given instance.
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70 * \param[in] sercom_instance Instance pointer.
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72 * \return Index of given instance.
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74 uint8_t _sercom_get_sercom_inst_index(
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75 Sercom *const sercom_instance)
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77 /* Save all available SERCOM instances for compare. */
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78 Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
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80 /* Find index for sercom instance. */
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81 for (uint32_t i = 0; i < SERCOM_INST_NUM; i++) {
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82 if ((uintptr_t)sercom_instance == (uintptr_t)sercom_instances[i]) {
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87 /* Invalid data given. */
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94 * Saves the given callback handler.
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96 * \param[in] instance Instance index.
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97 * \param[in] interrupt_handler Pointer to instance callback handler.
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99 void _sercom_set_handler(
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100 const uint8_t instance,
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101 const sercom_handler_t interrupt_handler)
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103 /* Initialize handlers with default handler and device instances with 0. */
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104 if (_handler_table_initialized == false) {
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105 for (uint32_t i = 0; i < SERCOM_INST_NUM; i++) {
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106 _sercom_interrupt_handlers[i] = &_sercom_default_handler;
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107 _sercom_instances[i] = NULL;
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110 _handler_table_initialized = true;
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113 /* Save interrupt handler. */
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114 _sercom_interrupt_handlers[instance] = interrupt_handler;
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119 * Converts a given SERCOM index to its interrupt vector index.
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121 #define _SERCOM_INTERRUPT_VECT_NUM(n, unused) \
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122 SYSTEM_INTERRUPT_MODULE_SERCOM##n,
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125 * Generates a SERCOM interrupt handler function for a given SERCOM index.
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127 #define _SERCOM_INTERRUPT_HANDLER(n, unused) \
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128 void SERCOM##n##_Handler(void) \
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130 _sercom_interrupt_handlers[n](n); \
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135 * Returns the system interrupt vector.
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137 * \param[in] sercom_instance Instance pointer
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139 * \return Enum of system interrupt vector
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140 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM0
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141 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM1
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142 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM2
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143 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM3
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144 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM4
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145 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM5
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146 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM6
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147 * \retval SYSTEM_INTERRUPT_MODULE_SERCOM7
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149 enum system_interrupt_vector _sercom_get_interrupt_vector(
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150 Sercom *const sercom_instance)
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152 const uint8_t sercom_int_vectors[SERCOM_INST_NUM] =
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154 MREPEAT(SERCOM_INST_NUM, _SERCOM_INTERRUPT_VECT_NUM, ~)
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157 /* Retrieve the index of the SERCOM being requested */
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158 uint8_t instance_index = _sercom_get_sercom_inst_index(sercom_instance);
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160 /* Get the vector number from the lookup table for the requested SERCOM */
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161 return (enum system_interrupt_vector)sercom_int_vectors[instance_index];
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164 /** Auto-generate a set of interrupt handlers for each SERCOM in the device */
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165 MREPEAT(SERCOM_INST_NUM, _SERCOM_INTERRUPT_HANDLER, ~)
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