| /** | |
| * \file | |
| * | |
| * \brief SAM D20 Serial Peripheral Interface Driver | |
| * | |
| * Copyright (C) 2012-2013 Atmel Corporation. All rights reserved. | |
| * | |
| * \asf_license_start | |
| * | |
| * \page License | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions are met: | |
| * | |
| * 1. Redistributions of source code must retain the above copyright notice, | |
| * this list of conditions and the following disclaimer. | |
| * | |
| * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| * this list of conditions and the following disclaimer in the documentation | |
| * and/or other materials provided with the distribution. | |
| * | |
| * 3. The name of Atmel may not be used to endorse or promote products derived | |
| * from this software without specific prior written permission. | |
| * | |
| * 4. This software may only be redistributed and used in connection with an | |
| * Atmel microcontroller product. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED | |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE | |
| * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR | |
| * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | |
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| * POSSIBILITY OF SUCH DAMAGE. | |
| * | |
| * \asf_license_stop | |
| * | |
| */ | |
| #include "sercom_interrupt.h" | |
| void *_sercom_instances[SERCOM_INST_NUM]; | |
| /** Save status of initialized handlers. */ | |
| static bool _handler_table_initialized = false; | |
| /** Void pointers for saving device instance structures. */ | |
| static void (*_sercom_interrupt_handlers[SERCOM_INST_NUM])(const uint8_t instance); | |
| /** | |
| * \internal | |
| * Default interrupt handler. | |
| * | |
| * \param[in] instance SERCOM instance used. | |
| */ | |
| static void _sercom_default_handler( | |
| const uint8_t instance) | |
| { | |
| ( void ) instance; | |
| Assert(false); | |
| } | |
| /** | |
| * \internal | |
| * Find index of given instance. | |
| * | |
| * \param[in] sercom_instance Instance pointer. | |
| * | |
| * \return Index of given instance. | |
| */ | |
| uint8_t _sercom_get_sercom_inst_index( | |
| Sercom *const sercom_instance) | |
| { | |
| /* Save all available SERCOM instances for compare. */ | |
| Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS; | |
| /* Find index for sercom instance. */ | |
| for (uint32_t i = 0; i < SERCOM_INST_NUM; i++) { | |
| if ((uintptr_t)sercom_instance == (uintptr_t)sercom_instances[i]) { | |
| return i; | |
| } | |
| } | |
| /* Invalid data given. */ | |
| Assert(false); | |
| return 0; | |
| } | |
| /** | |
| * \internal | |
| * Saves the given callback handler. | |
| * | |
| * \param[in] instance Instance index. | |
| * \param[in] interrupt_handler Pointer to instance callback handler. | |
| */ | |
| void _sercom_set_handler( | |
| const uint8_t instance, | |
| const sercom_handler_t interrupt_handler) | |
| { | |
| /* Initialize handlers with default handler and device instances with 0. */ | |
| if (_handler_table_initialized == false) { | |
| for (uint32_t i = 0; i < SERCOM_INST_NUM; i++) { | |
| _sercom_interrupt_handlers[i] = &_sercom_default_handler; | |
| _sercom_instances[i] = NULL; | |
| } | |
| _handler_table_initialized = true; | |
| } | |
| /* Save interrupt handler. */ | |
| _sercom_interrupt_handlers[instance] = interrupt_handler; | |
| } | |
| /** \internal | |
| * Converts a given SERCOM index to its interrupt vector index. | |
| */ | |
| #define _SERCOM_INTERRUPT_VECT_NUM(n, unused) \ | |
| SYSTEM_INTERRUPT_MODULE_SERCOM##n, | |
| /** \internal | |
| * Generates a SERCOM interrupt handler function for a given SERCOM index. | |
| */ | |
| #define _SERCOM_INTERRUPT_HANDLER(n, unused) \ | |
| void SERCOM##n##_Handler(void) \ | |
| { \ | |
| _sercom_interrupt_handlers[n](n); \ | |
| } | |
| /** | |
| * \internal | |
| * Returns the system interrupt vector. | |
| * | |
| * \param[in] sercom_instance Instance pointer | |
| * | |
| * \return Enum of system interrupt vector | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM0 | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM1 | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM2 | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM3 | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM4 | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM5 | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM6 | |
| * \retval SYSTEM_INTERRUPT_MODULE_SERCOM7 | |
| */ | |
| enum system_interrupt_vector _sercom_get_interrupt_vector( | |
| Sercom *const sercom_instance) | |
| { | |
| const uint8_t sercom_int_vectors[SERCOM_INST_NUM] = | |
| { | |
| MREPEAT(SERCOM_INST_NUM, _SERCOM_INTERRUPT_VECT_NUM, ~) | |
| }; | |
| /* Retrieve the index of the SERCOM being requested */ | |
| uint8_t instance_index = _sercom_get_sercom_inst_index(sercom_instance); | |
| /* Get the vector number from the lookup table for the requested SERCOM */ | |
| return (enum system_interrupt_vector)sercom_int_vectors[instance_index]; | |
| } | |
| /** Auto-generate a set of interrupt handlers for each SERCOM in the device */ | |
| MREPEAT(SERCOM_INST_NUM, _SERCOM_INTERRUPT_HANDLER, ~) |