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/**
*
* \file
*
* \brief SAM Frequency Meter driver.
*
* This file defines a useful set of functions for the FREQM on SAM devices.
*
* Copyright (c) 2015-2016 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 "freqm.h"
#include "freqm_callback.h"
/** \internal Max number of callback type. */
#define FREQM_CALLBACK_TYPE_NUM 1
struct freqm_module *_freqm_instance;
/**
* \brief Registers a callback
*
* Registers a callback function which is implemented by the user.
*
* \note The callback must be enabled by \ref freqm_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 FREQM 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 freqm_register_callback(
struct freqm_module *const module,
freqm_callback_t callback_func,
enum freqm_callback callback_type)
{
/* Sanity check arguments */
Assert(module);
Assert(callback_func);
if (callback_type >= FREQM_CALLBACK_TYPE_NUM) {
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
/* Register callback function */
module->callback[callback_type] = callback_func;
return STATUS_OK;
}
/**
* \brief Unregisters a callback
*
* Unregisters a callback function implemented by the user. The callback should be
* disabled before it is unregistered.
*
* \param[in] module Pointer to FREQM software instance struct
* \param[in] callback_type Callback type given by an enum
*
* \retval STATUS_OK The function exited successfully
*/
enum status_code freqm_unregister_callback(
struct freqm_module *module,
enum freqm_callback callback_type)
{
/* Sanity check arguments */
Assert(module);
if (callback_type >= FREQM_CALLBACK_TYPE_NUM) {
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
/* Unregister callback function */
module->callback[callback_type] = NULL;
return STATUS_OK;
}
/**
* \internal The FREQM interrupt handler.
*/
void FREQM_Handler(void)
{
/* Get device instance from the look-up table */
struct freqm_module *module = _freqm_instance;
/* Read and mask interrupt flag register */
uint32_t status = FREQM->INTFLAG.reg;
/* Check if data ready needs to be serviced */
if (status & FREQM_INTFLAG_DONE) {
if (module->callback[FREQM_CALLBACK_MEASURE_DONE]) {
FREQM->INTFLAG.reg = FREQM_INTFLAG_DONE;
module->callback[FREQM_CALLBACK_MEASURE_DONE]();
}
}
}
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