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/**
* \file
*
* \brief SAM AC - Analog Comparator Callback Driver
*
* Copyright (C) 2013-2015 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 "ac_callback.h"
struct ac_module *_ac_instance[AC_INST_NUM];
void _ac_interrupt_handler(const uint32_t instance_index);
/**
* \brief Registers a callback.
*
* Registers a callback function which is implemented by the user.
*
* \note The callback must be enabled by \ref ac_enable_callback,
* in order for the interrupt handler to call it when the conditions for the
* callback type is met.
*
* \param[in] module Pointer to software instance struct
* \param[in] callback_func Pointer to callback function
* \param[in] callback_type Callback type given by an enum
*
* \retval STATUS_OK The function exited successfully
*/
enum status_code ac_register_callback(
struct ac_module *const module,
ac_callback_t callback_func,
const enum ac_callback callback_type)
{
/* Sanity check arguments */
Assert(module);
Assert(callback_func);
/* Register callback function */
module->callback[callback_type] = callback_func;
/* Set software flag for callback */
module->register_callback_mask |= (1 << callback_type);
return STATUS_OK;
}
/**
* \brief Unregisters a callback.
*
* Unregisters a callback function implemented by the user.
*
* \param[in] module Pointer to AC software instance struct
* \param[in] callback_type Callback type given by an enum
*
* \retval STATUS_OK The function exited successfully
*/
enum status_code ac_unregister_callback(
struct ac_module *const module,
const enum ac_callback callback_type)
{
/* Sanity check arguments */
Assert(module);
/* Unregister callback function */
module->callback[callback_type] = NULL;
/* Clear software flag for callback */
module->register_callback_mask &= ~(1 << callback_type);
return STATUS_OK;
}
/**
* \internal ISR handler for AC
*/
#if (AC_INST_NUM == 1)
void AC_Handler(void)
{
_ac_interrupt_handler(0);
}
#elif (AC_INST_NUM == 2)
void AC_Handler(void)
{
_ac_interrupt_handler(0);
}
void AC1_Handler(void)
{
_ac_interrupt_handler(1);
}
#else
# error This driver is not support more than three AC instances.
#endif
/**
* \brief Interrupt Handler for AC module.
*
* Handles interrupts as they occur, it will run the callback functions
* that are registered and enabled.
*
* \param [in] instance_index Default value 0
*/
void _ac_interrupt_handler(const uint32_t instance_index)
{
/* Temporary variable */
uint8_t interrupt_and_callback_status_mask;
/* Get device instance from the look-up table */
struct ac_module *module = _ac_instance[instance_index];
/* Read and mask interrupt flag register */
interrupt_and_callback_status_mask =
_ac_instance[instance_index]->hw->INTFLAG.reg &
(module->register_callback_mask & module->enable_callback_mask);
/* Check if comparator channel 0 needs to be serviced */
if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP0) {
/* Invoke registered and enabled callback function */
(module->callback[AC_CALLBACK_COMPARATOR_0])(module);
/* Clear interrupt flag */
module->hw->INTFLAG.reg = AC_INTFLAG_COMP0;
}
/* Check if comparator channel 1 needs to be serviced */
if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP1) {
/* Invoke registered and enabled callback function */
(module->callback[AC_CALLBACK_COMPARATOR_1])(module);
/* Clear interrupt flag */
module->hw->INTFLAG.reg = AC_INTFLAG_COMP1;
}
/* Check if window 0 needs to be serviced */
if (interrupt_and_callback_status_mask & AC_INTFLAG_WIN0) {
/* Invoke registered and enabled callback function */
(module->callback[AC_CALLBACK_WINDOW_0])(module);
/* Clear interrupt flag */
module->hw->INTFLAG.reg = AC_INTFLAG_WIN0;
}
#if (AC_NUM_CMP > 2)
/* Check if comparator channel 2 needs to be serviced */
if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP2) {
/* Invoke registered and enabled callback function */
(module->callback[AC_CALLBACK_COMPARATOR_2])(module);
/* Clear interrupt flag */
module->hw->INTFLAG.reg = AC_INTFLAG_COMP2;
}
/* Check if comparator channel 3 needs to be serviced */
if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP3) {
/* Invoke registered and enabled callback function */
(module->callback[AC_CALLBACK_COMPARATOR_3])(module);
/* Clear interrupt flag */
module->hw->INTFLAG.reg = AC_INTFLAG_COMP3;
}
# if !(SAMC20)
/* Check if window 1 needs to be serviced */
if (interrupt_and_callback_status_mask & AC_INTFLAG_WIN1) {
/* Invoke registered and enabled callback function */
(module->callback[AC_CALLBACK_WINDOW_1])(module);
/* Clear interrupt flag */
module->hw->INTFLAG.reg = AC_INTFLAG_WIN1;
}
# endif
#endif /* (AC_NUM_CMP > 2) */
}
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