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/* ---------------------------------------------------------------------------- */
/* Atmel Microcontroller Software Support */
/* SAM Software Package License */
/* ---------------------------------------------------------------------------- */
/* Copyright (c) 2015, Atmel Corporation */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following condition is met: */
/* */
/* - Redistributions of source code must retain the above copyright notice, */
/* this list of conditions and the disclaimer below. */
/* */
/* Atmel's name may not be used to endorse or promote products derived from */
/* this software without specific prior written permission. */
/* */
/* DISCLAIMER: 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 */
/* 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. */
/* ---------------------------------------------------------------------------- */
/**
* \file
*
* \par Purpose
*
* Configuration and handling of interrupts on PIO status changes. The API
* provided here have several advantages over the traditional PIO interrupt
* configuration approach:
* - It is highly portable
* - It automatically demultiplexes interrupts when multiples pins have been
* configured on a single PIO controller
* - It allows a group of pins to share the same interrupt
*
* However, it also has several minor drawbacks that may prevent from using it
* in particular applications:
* - It enables the clocks of all PIO controllers
* - PIO controllers all share the same interrupt handler, which does the
* demultiplexing and can be slower than direct configuration
* - It reserves space for a fixed number of interrupts, which can be
* increased by modifying the appropriate constant in pio_it.c.
*
* \par Usage
*
* -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts()
* with the desired priority (0 ... 7).
* -# Configure a status change interrupt on one or more pin(s) with
* PIO_ConfigureIt().
* -# Enable & disable interrupts on pins using PIO_EnableIt() and
* PIO_DisableIt().
*/
#ifndef _PIO_IT_
#define _PIO_IT_
/*
* Headers
*/
#include "pio.h"
#include <rtems.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Global functions
*/
extern void PIO_InitializeInterrupts(uint32_t dwPriority);
extern void PIO_ConfigureIt(const Pin *pPin,
void (*handler)(const Pin *, void *arg), void *arg);
extern rtems_status_code PIO_RemoveIt(const Pin *pPin,
void (*handler)(const Pin *, void *arg), void *arg);
/**
* Enables the given interrupt source if it has been configured. The status
* register of the corresponding PIO controller is cleared prior to enabling
* the interrupt.
* \param pPin Interrupt source to enable.
*/
static inline void PIO_EnableIt(const Pin *pPin)
{
pPin->pio->PIO_ISR;
pPin->pio->PIO_IER = pPin->mask;
}
/**
* Disables a given interrupt source, with no added side effects.
*
* \param pPin Interrupt source to disable.
*/
static inline void PIO_DisableIt(const Pin *pPin)
{
pPin->pio->PIO_IDR = pPin->mask;
}
/**
* Check whether a given interrupt source is active.
*
* \param pPin Interrupt source to check.
*/
static inline bool PIO_ItIsActive(const Pin *pPin)
{
return ((pPin->pio->PIO_IMR & pPin->mask) != 0);
}
extern void PIO_IT_InterruptHandler(void);
extern void PioInterruptHandler(uint32_t id, Pio *pPio);
extern void PIO_CaptureHandler(void);
#ifdef __cplusplus
}
#endif
#endif /* #ifndef _PIO_IT_ */
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