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digistump-sam/system/libsam/include/pio_it.h

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+/* ----------------------------------------------------------------------------
+ *         SAM Software Package License
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2011-2012, 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"
+
+#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* ) ) ;
+
+extern void PIO_EnableIt( const Pio* pPio, const uint32_t dwMask ) ;
+extern void PIO_DisableIt( const Pio* pPio, const uint32_t dwMask ) ;
+
+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_ */
+