circuitpython/atmel-samd/asf/sam0/drivers/sercom/sercom_interrupt.c

142 lines
4.5 KiB
C

/**
* \file
*
* \brief SAM Serial Peripheral Interface Driver
*
* Copyright (C) 2012-2015 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
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#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)
{
Assert(false);
}
/**
* \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, ~)